Composition containing acidic oxidant, having efficient aluminium corrosion inhibition, and use thereof

FIELD: chemistry.

SUBSTANCE: group of inventions relates to disinfection and sterilisation. The acidic liquid composition used is a liquid composition which contains (a) an acidic oxidant, (b) nitric acid or salt thereof and (c) at least one carboxylic acid selected from a group consisting of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or salt thereof. In the disinfection and sterilisation method, the acidic liquid composition contains an acidic oxidant having an excellent corrosion inhibiting property (property of preventing rust, property of inhibiting formation of an oxide film) for aluminium-based metals even in acidic conditions, without affecting the appearance or function of such metals.

EFFECT: efficiently used to disinfect or sterilise an object having a part made from aluminium-based metals.

12 cl, 20 tbl, 4 ex

 

The technical field to which the invention relates

The present invention relates to liquid compositions used primarily for sterilization or disinfection. Specifically, the present invention relates to acidic liquid composition having sterilizing or disinfecting action and excellent effect of suppressing corrosion of aluminum.

Prior art

Because acid oxidants possess excellent sterilizing effects, they are widely used in the fields of medicine and food products as disinfectants and sterilizing means. In particular, since the acid oxidant containing percarbonate acid, such as peracetic acid, and hydrogen peroxide, capable of disinfection or sterilization in a short period of time, they are an effective disinfectant/sterilizing means for the environment and devices that cannot be disinfected physically.

At the same time, acid oxidizing agents have corrosive towards metals and often have a deleterious effect on the metal materials or cause rust, and thus often cause damage to the functioning and appearance of such metals.

Among metals, in particular, to the aluminum or metals, containing aluminum, such as aluminum alloys (hereinafter referred to in this document also referred to as “metal based on aluminum”), there is a tendency to corrosion, such as the occurrence of pitting corrosion in the presence of the chloride ions and the precipitation of aluminum hydroxide due to components of hardness in the water. Such corrosion occurs to a significant extent, especially in acidic conditions, at an accelerated rate.

To suppress the corrosion of metals, such as metals on the basis of aluminum, used suppressors of corrosion. For example, as suppressors of corrosion known compositions containing chromates and molybdates. Such chromates and molybdates are used as tools to prevent rust in the chemical sterilizing tools that disinfect or sterilize medical devices that include metal parts, such as the endoscope in the medical field (see Patent literature 1). However, such compositions are under the control of system of release of environmental contaminants and transfer registers (PRTR), and are therefore impractical.

It is known that acid salts, such as phosphates, nitrates, nitrites, molybdates, wolframates, borates, silicates, sulfates, sulfites and carboxylates, as well as chromates and molybdates, as well as salts of amines; triazole are effective as a means to prevent rust for metals (see Patent literature 2). The carboxylates described in Patent literature 2, are salts of aliphatic monocarboxylic acids, for which the number of carbon atoms is from 6 to 12; salts of aliphatic dicarboxylic acids, for which the number of carbon atoms is from 6 to 12; and salts of aromatic carboxylic acids (paragraph 0016 Patent literature 2). Additionally, Patent literature 3 describes that, among the above salts of acids, nitrites and molybdates are used in combination to suppress corrosive towards metal acid oxidizing agents, such as percarbonate acid.

It is known that among the various types of salts of the acids disclosed in Patent literature 2, the phosphates are a means to prevent rust with excellent effects of suppressing corrosion of the metals on the basis of aluminum. It is also known that the combined use of phosphate and at least one compound selected from the group consisting of compounds of strontium, magnesium compounds and calcium compounds allows to realize excellent characteristics of suppressing corrosion of metals on the basis of aluminum at high temperatures and sinergeticheskogo improve the effect of suppressing cavitation damage (Patent literature 4).

Patent literature 1: U.S. Patent No. 5900256

Patent literature 2: Unexamined patent application of Japan No. 2007-254693

Patent literature 3: U.S. Patent No. 5077008

Patent literature 4: Unexamined patent application of Japan No. 2005-187905

The technical problem

The metal based on aluminum, such as aluminum and aluminum alloys are often used in medical instruments such as an endoscope, which requires routine sterilization or disinfection process. Therefore, it is necessary to take measures against damage to their appearance and function caused by chemical disinfection or sterilization processing.

Therefore, as mentioned above, have been developed various types of suppressors of corrosion for metals on the basis of aluminum, and it was suggested that the addition of such suppressors of corrosion in the chemical disinfectant or sterilizing agent for use in combination. However, specifically, in the field of medicine and food products, such suppressors of corrosion must be safe for use, taking into account the residual substances and toxicity. Additionally, in the case where the acid oxidizing agents, such as percarbonate acid, such peracetic acid, and hydrogen peroxide, used as a disinfectant or sterilizing means, the camera is lnost acid oxidizers should also be taken into account.

Therefore, the aim of the present invention is to provide an acidic liquid composition comprising an acid oxidant, which has an excellent characteristic of suppressing corrosion characteristics prevent rust, characteristic of suppressing the formation of the oxide film) for metals based on aluminum, even under acidic conditions, which does not affect the appearance or function of such metals on the basis of aluminum and which can effectively be used for disinfection or sterilization of an object, which includes a part made of metal based on aluminum, especially medical instrument such as an endoscope.

Moreover, another objective of the present invention is to provide the use of acidic liquid composition as a disinfectant or sterilizing agent for an object that includes a part made of metal based on aluminum, and to provide a method of suppressing the corrosive action of an acid oxidizing agent for aluminium.

Solution

The authors of the present invention conducted a thorough research to solve this problem and found that by combining an acid oxidant, such as hydrogen peroxide and percarbonate acid, for example, peracetic acid, which is is effective as a disinfectant or sterilizing means, (1) nitric acid and its salt and (2) carboxylic acid, (mono-, di-, and tricarboxylic acid) and its salt corrosive action of acid oxidizer for aluminum can be suppressed. The authors present invention also confirmed that the composition comprising the three components can be effectively applied as a disinfectant or sterilizing agent for medical instrument such as an endoscope, which includes a part made of metal based on aluminum, such as aluminum and aluminum alloys.

The present invention was completed based on these findings and includes options for implementation, below.

(I)Acidic liquid composition

(I-1) Acidic liquid composition containing (a) acidic oxidant, (b) nitric acid or its salt and (c) at least one carboxylic acid selected from the group consisting of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or its salt.

(I-2) Acidic liquid composition according to (I-1), where (a) acidic oxidant is at least one oxidant selected from the group consisting of peracetic acid and hydrogen peroxide.

(I-3) Acidic liquid composition according to (I-2), which is obtained by blending in a peracetic acid at relative activities the nom content, equal to 1 wt.% or less, preferably from 0.05 to 1 wt.%, or contact of hydrogen peroxide with a relative content of 15 wt.% or less, preferably from 3 to 15 wt.%.

It should be noted that peracetic acid becomes an equilibrium mixture of acetic acid and hydrogen peroxide in water. Therefore, usually, peracetic acid does not exist in the same form as in the acidic liquid composition (aqueous solution)described in (I-3). However, regardless of the status of the acidic liquid composition, such acidic liquid composition (aqueous solution), which is obtained by mixing at least peracetic acid at the specified higher relative content included in the acidic liquid composition according to (I-3). In this sense, the above (I-3) can also be described as “acidic liquid composition according to (I-2)containing an equilibrium mixture of acetic acid and hydrogen peroxide with a relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%; or hydrogen peroxide with a relative content of 15 wt.% or less, preferably from 3 to 15 wt.%”.

(I-4) the Acidic liquid composition according to (I-2), which is obtained by blending in a peracetic acid relative content of 1 wt.% or less, preferably is from 0.05 to 1 wt.%, and contact of hydrogen peroxide with a relative content of 2 wt.% or less, preferably from 0.05 to 2 wt.%.

As described above, this acidic liquid composition (aqueous solution), which is obtained by mixing at least peracetic acid at the specified higher relative content included, regardless of its state, in the acidic liquid composition according to (I-4). In this sense, the acidic liquid composition according to (I-4) can also be described as “acidic liquid composition according to (I-2)containing an equilibrium mixture of acetic acid and hydrogen peroxide with a relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%; and hydrogen peroxide, with a relative content of 2 wt.% or less, preferably from 0.05 to 2 wt.%”.

(I-5) the Acidic liquid composition according to any of (I-1) to (I-4), where the (c) carboxylic acid is at least one acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid.

(I-6) the Acidic liquid composition according to any of (I-1) to (I-5)where pH is less than 7, preferably the pH is from 1 to 6.

(I-7) the Acidic liquid composition according to any of (I-1) to (I-6)containing the (b) nitric acid or the salt at a concentration equal to from 0.1 to 10 wt.%.

(I-8) the Acidic liquid composition according to any of (I-1) to (I-7), containing the (c) carboxylic acid or its salt at a concentration equal to from 0.1 to 30 wt.%.

(I-9) the Acidic liquid composition according to any of (I-1) to (I-8), where the stiffness is in the range from 0 to 400 hours/million concentration of calcium carbonate in the range of from 0 to 280 hours/million chlorine concentration.

(I-10) the Acidic liquid composition according to any of (I-1) to (I-9), further containing (d) an additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers.

(I-11) the Acidic liquid composition according to any of (I-1) to (I-10), which is a disinfectant or sterilizing agent.

(I-12) the Acidic liquid composition according to any of (I-1) to (I-10), which is a disinfectant or sterilizing agent for an object that contains all or part of the aluminum or aluminum alloy.

(II)The combined product

(II-1) a Combination product containing:

(1) acidic composition comprising (a) acidic oxidant contained in the container; and

(2) a composition containing (b) nitric acid or its salt, (c) at least one carboxylic acid selected from the group, with the standing of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or its salt, and (d) an additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers contained in the container other than the container acid composition (1).

(II-2) the Combined product in accordance with (II-1), where (a) acidic oxidant in acidic composition (1) represents at least one oxidant selected from the group consisting of peracetic acid and hydrogen peroxide.

(II-3) a Combination product in accordance with (II-1) or (II-2), where (c) carboxylic acid in the composition (2) represents at least one acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid.

(II-4) Combination product in accordance with (II-2) or (II-3), where one of peracetic acid or hydrogen peroxide is used as the (a) acidic oxidant in acidic composition (1). As described above, peracetic acid becomes an equilibrium mixture of acetic acid and hydrogen peroxide in water. Therefore, in the case where peracetic acid is used as acid oxidant, peracetic acid usually exists as an equilibrium mixture of acetic acid and hydrogen peroxide in acidic composition. Acid composition is I (1) according to (II-4) includes all of the acid composition, regardless of their status, who receive through contact at least peracetic acid.

(II-5) Combination product in accordance with (II-2) or (II-3), where both of peracetic acid and hydrogen peroxide is used as the (a) acidic oxidant in acidic composition (1). In this case, peracetic acid exists as an equilibrium mixture of acetic acid and hydrogen peroxide in acidic compositions, and acetic acid and hydrogen peroxide, thus, is indeed contained in the acid composition. However, the acid composition (1) according to (II-5) includes all of the acid composition, regardless of their status, who receive by mixing at least peracetic acid and hydrogen peroxide.

(II-6) Combination product according to (II-4), where the acid composition (1) contains (a) acidic oxidant, with a relative content of equal to:

in the case where the acidic oxidant is a peracetic acid, 15 wt.% or less, preferably from 5 to 15 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid, the relative content of 15 wt.% or less, preferably from 5 to 15 wt.%); in the case where acidic oxidant is hydrogen peroxide, 30 wt.% or less, prefer the Ino from 3 to 15 wt.%.

(II-7) Combination product according to (II-4) or (II-6), where the composition (2) contains (b) nitric acid or its salt and (c) carboxylic acid or its salt, with a relative concentrations equal to:

(b) nitric acid or its salt is from 2 to 30 wt.%; and

(c) carboxylic acid or its salt is from 2 to 30 wt.%.

(II-8) Combination product according to (II-4), (II-6) or (II-7)where acid composition (1) composition (2) is mixed before use so that the (a) acidic oxidant, (b) nitric acid or its salt and (c) carboxylic acid or its salt is regulated by the relative concentrations equal to:

(a) acidic oxidant:

in the case of peracetic acid: 1 wt.% or less, preferably from 0.05 to 1 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid, the relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%); in the case of hydrogen peroxide: 15 wt.% or less, preferably from 3 to 15 wt.%;

(b) nitric acid or its salt is from 0.1 to 10 wt.%; and

(c) carboxylic acid or its salt is from 0.1 to 30 wt.%.

(II-9) Combination product according to (II-8)where acid composition (1) composition (2) is mixed before use so that the pH adjust to being in the interval from 1 to 6 and chelating means to regulate the relative with whom Ergani, equal to from 0.01 to 0.5 wt.%.

(II-10) Combination product according to (II-5), where the acid composition (1) contains (a) acidic oxidant, with a relative content of equal to:

peracetic acid: 15 wt.% or less, preferably from 5 to 15 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid, the relative content of 15 wt.% or less, preferably from 5 to 15 wt.%); and

hydrogen peroxide: 30% by weight or less, preferably from 7 to 22 wt.%.

(II-11) Combined product in accordance with (II-5) or (II-10), where the composition (2) contains (b) nitric acid or its salt and (c) carboxylic acid or its salt, with a relative concentrations equal to:

(b) nitric acid or its salt is from 2 to 30 wt.%; and

(c) carboxylic acid or its salt is from 2 to 30 wt.%.

(II-12) Combination product according to (II-5), (II-10) or (II-11), where acid composition (1) composition (2) is mixed before use so that the (a) acidic oxidant, (b) nitric acid or its salt and (c) carboxylic acid or its salt to regulate the following concentrations:

(a) acidic oxidant:

peracetic acid with 1 wt.% or less, preferably from 0.05 to 1 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid, the relative content of equal mass.% or less, preferably from 0.05 to 1 wt.%) and hydrogen peroxide with 2 wt.% or less, preferably from 0.05 to 1 wt.%;

(b) nitric acid or its salt is from 0.1 to 10 wt.%; and

(c) carboxylic acid or its salt is from 0.1 to 30 wt.%.

(II-13) the Combined product in accordance with (II-12), where acid composition (1) composition (2) is mixed before use so that the pH adjust to being in the interval from 1 to 6, and the chelating agent is at a relative content equal to from 0.01 to 0.5 wt.%.

(II-14) Combination product according to any one of (II-1) to (II-13), which is a disinfectant or sterilizing agent.

(II-15) Combination product according to any one of (II-1) to (II-13), which is a disinfectant or sterilizing agent for an object that contains all or part of the aluminum or aluminum alloy.

(III)The method of obtaining the acidic liquid composition

(III-1) a Method of obtaining the acidic liquid composition comprising a stage of mixing (a) acidic oxidant, (b) nitric acid or a salt thereof and (c) at least one carboxylic acid selected from the group consisting of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or a salt thereof.

(III-2) Method according to (III-1), where (a) acidic oxidant represents at least one oxidizer selected from the group consisting of peracetic acid and hydrogen peroxide.

(III-3) the Method according to (III-2), comprising a stage of mixing (a) acidic oxidant (b) nitric acid or its salt and (c) carboxylic acid or its salt, so that peracetic acid is at a concentration equal to from 1 wt.% or less, preferably from 0.05 to 1 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid, the relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%), or hydrogen peroxide is at a concentration equal to from 15 wt.% or less, preferably from 3 to 15 wt.%.

(III-4) the Method according to (III-2), comprising a stage of mixing (a) acidic oxidant (b) nitric acid or its salt and (c) carboxylic acid or its salt so that the concentration of peracetic acid and hydrogen peroxide is 1 wt.% or less, preferably from 0.05 to 1 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%), and the hydrogen peroxide concentration is 2 wt.% or less, preferably from 0.05 to 1 wt.%.

(III-5) the Method of obtaining, in accordance with any of (III-1) to (III-4), where (c) carbon is I acid is a, at least one acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid.

(III-6) the Method according to any one of (III-1) to (III-5), where the pH of the acidic liquid composition adjust to less than 7, preferably the pH is from 1 to 6.

(III-7) the Method according to any one of (III-1) to (III-6)where (b) nitric acid or its salt are mixed in such a way that its concentration ranges from 0.1 to 10 wt.%.

(III-8) the Method according to any one of (III-1) to (III-7)where (c) carboxylic acid or its salt are mixed in such a way that its concentration is from 0.1 to 30 wt.%.

(III-9) the Method according to any one of (III-1) to (III-8), where the stiffness of the acidic liquid composition to regulate finding from 0 to 400 hours/million concentration of calcium carbonate and from 0 to 280 hours/million chlorine concentration.

(III-10) the Method according to any one of (III-1) to (III-9), further comprising a stage of mixing (d) an additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers.

(IV)The method of disinfection or sterilization

(IV-1) the Method of disinfection or sterilization stage including:

processing object, comprising the metal based on aluminum as a component, using acidic liquid composition is, containing (a) acidic oxidant, (b) nitric acid or its salt, and (c) at least one carboxylic acid selected from the group consisting of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or its salt.

(IV-2) the Method according to (IV-1), where (a) acidic oxidant is at least one oxidant selected from the group consisting of peracetic acid and hydrogen peroxide.

(IV-3) the Method according to (IV-2), where the acidic liquid composition used contains peracetic acid at a concentration equal to from 1 wt.% or less, preferably from 0.05 to 1 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid, the relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%), or hydrogen peroxide at a concentration equal to from 15 wt.% or less, preferably from 3 to 15 wt.%.

(IV-4) the Method according to (IV-2), where the acidic liquid composition used contains peracetic acid at a concentration equal to from 1 wt.% or less, preferably from 0.05 to 1 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%), and hydrogen peroxide at a concentration equal to from 2 wt.% what if less, preferably from 0.05 to 2 wt.%.

(IV-5) the Method according to any one of (IV-1) to (IV-4), where the (c) carboxylic acid is at least one acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid.

(IV-6) the Method according to any one of (IV-1) to (IV-5), where the pH of the acidic liquid composition is less than 7, and preferably the pH is from 1 to 6.

(IV-7) the Method according to any one of (IV-1) to (IV-6), where the used acidic liquid composition that contains (b) nitric acid or its salt at a concentration equal to from 0.1 to 10 wt.%.

(IV-8) the Method according to any one of (IV-1) to (IV-7), where the used acidic liquid composition, which contains (c) carboxylic acid or its salt at a concentration equal to from 0.1 to 30 wt.%.

(IV-9) the Method according to any one of (IV-1) to (IV-7), where the used acidic liquid composition whose hardness is in the range from 0 to 400 hours/million concentration of calcium carbonate in the range of from 0 to 280 hours/million in chlorine concentration.

(IV-10) the Method according to any one of (IV-1) to (IV-9), where the used acidic liquid composition, which contains (d) an additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers, in addition to (a) acid ocil the indicator, (b) nitric acid or a salt thereof and (c) carboxylic acid or a salt thereof.

(V)The method of suppressing corrosion of activity with respect to aluminum

(V-1) a Method of suppressing corrosion activity of acid oxidizer with respect to aluminum, where

(a) acidic oxidant used in combination with (b) nitric acid or its salt, and (c) at least one carboxylic acid selected from the group consisting of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or its salt.

(V-2) Method according to (V-1), where (a) acidic oxidant is at least one oxidant selected from the group consisting of peracetic acid and hydrogen peroxide.

(V-3) the Method according to (V-1) or (V-2), where (c) carboxylic acid is at least one acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid.

The predominant effects of the invention

The acidic liquid composition of the present invention contains, as active ingredients, acid oxidizing agents such as peracetic acid and hydrogen peroxide, which does not create problems with residual substances or toxicity. Therefore, the acidic liquid composition of the present invention can be used as the chemical disinfectant or sterilizing agent in the field of medicine and food. In particular, since the acidic liquid composition of the present invention has an excellent effect of suppressing corrosion of metals, particularly aluminium, acid liquid composition can be effectively applied as a disinfectant or sterilizing agent for an object (for example, a medical instrument such as an endoscope), which is made of metal based on aluminum, such as aluminum or aluminum alloy, or contains part of it.

It should be noted that in the present invention, the corrosion means that the appearance or function of the metal based on aluminum, such as aluminum or aluminum alloy, are damaged by chemical exposure. Specifically, examples of corrosion include the phenomenon of changing the appearance or the appearance of rust on the metal based on aluminum and phenomenon in which the metal surface is ionized due to the reaction of oxidation-reduction and is peeling from the surface.

Description of embodiments

(I)Acidic liquid composition

The acidic liquid composition of the present invention contains (a) acidic oxidant, (b) nitric acid or its salt (hereinafter referred to in this document referred to as the “product of nitric acid”) and (c)at least one carboxylic acid selected from the group sotoyama is from monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or its salt (hereinafter referred to in this document referred to as “the product of a carboxylic acid”). The composition has a disinfecting or sterilizing action based on dezinfitsiruyuschim or sterilizing action of acid oxidizer. Also, through the use of (a) acidic oxidant in combination with (b) the product of nitric acid and (c) the product of a carboxylic acid, a corrosive action on aluminum (a) acidic oxidant is suppressed. Accordingly, the composition can be effectively used for disinfection or sterilization of an object made of metal based on aluminum, such as aluminum or aluminum alloy, or its containing part.

It should be noted that in the present invention the metal based on aluminum” is a generic term for metal, made of aluminum and a metal containing aluminum partly as a metallic substance, namely aluminum alloy. Aluminum alloy is not limited to the specific aluminum alloy and may be any of aluminum alloys, whose international numbers represent 1000 (pure aluminum), 2000 (based alloy Al-Cu), 3000 (based alloy, Al-Mn), 4000 (based alloy Al-Si), 5000 (based alloy Al-Mg), 6000 (based alloy Al-Mg-Si) and 7000 (based alloy Al-Zn-Mg alloy based on Al-Zn-Mg-Cu)

Preferable examples of the (a) acidic oxidant, which is the target in the present invention, are peracetic acid and hydrogen peroxide. They can be used individually or in combination.

In the case where the acidic oxidant is used only peracetic acid, examples of the relative content of peracetic acid for mixing in the acidic liquid composition of the present invention are 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% when the concentration of the application. It should be noted that peracetic acid exists in a state of equilibrium mixture of acetic acid and hydrogen peroxide in water. Therefore, the relative content of peracetic acid for mixing in the acidic liquid composition means the concentration of the equilibrium mixture (peracetic acid, acetic acid, hydrogen peroxide)generated from the peracetic acid in the final acidic liquid composition (aqueous solution).

In the case where the acidic oxidant is used only hydrogen peroxide, examples of the content of hydrogen peroxide in acidic liquid composition of the present invention are 15 wt.% or less, preferably from 3 to 15 wt.%, more preferably from 3 to 7.5 wt.% when the concentration at which a change. The lower limit of the amount of each acid oxidizer contained in the acidic liquid composition is preferably the minimum amount that enables the manifestation of the disinfectant action of the acidic liquid composition. Examples of the lower limit of peracetic acid are of 0.05 wt.%, preferably 0.2 wt.% (to 0.05 wt.%, preferably 0.2 wt.% as equilibrium mixture generated from the peracetic acid), more preferably 0.3 wt.%. Examples of the lower limit of hydrogen peroxide is 3 wt.%, preferably 4 wt.%, more preferably 5 wt.%.

In the case where peracetic acid and hydrogen peroxide is used as the acidic oxidant in combination, examples of the relative content of peracetic acid for mixing in the acidic liquid composition of the present invention are 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% at the concentration of use (the concentration of the equilibrium mixture generated from the peracetic acid). Examples of the content of hydrogen peroxide is 2 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% when the concentration of the application.

Examples (b) nitrate for use in combination with the (a) acidic oxidant are salts of alkaline metallovedenie acid, such as, preferably, sodium nitrate and potassium nitrate, more preferably potassium nitrate. Nitric acid or its salt is blended with a relative content so that it applied concentration in the acidic liquid composition of the present invention is from 0.1 to 10 wt.%. Preferably the concentration of use is from 0.1 to 5 wt.%, more preferably from 0.1 to 1 wt.%.

Examples of the (c) carboxylic acids for use in combination with the (a) acidic oxidant and (b) nitric acid or its salt are a monocarboxylic acid with a low molecular weight dicarboxylic acid with low molecular weight and tricarboxylic acid with low molecular weight, each of which has a molecular mass equal to preferably 200 or less. Here is an example of the preferred monocarboxylic acid is lactic acid (molecular weight 90,08); preferred examples of dicarboxylic acids are malic acid (molecular weight 134,09) and succinic acid (molecular weight 118,09); and an example of a preferred tricarboxylic acid is citric acid (molecular weight 192,13). Among these carboxylic acids, lactic acid, malic acid and citric acid is a hydroxy acid. Examples of salts of these carboxylic acids are salts saloon the x metal carboxylic acid and sodium, carboxylic acid and potassium; salts of alkaline-earth metal carboxylic acid and calcium and carboxylic acid and magnesium.

(c) Carboxylic acid and its salt used in the relative content in such a way that its concentration for use in the acidic liquid composition of the present invention is from 0.1 to 30 wt.%. Preferably the concentration of use is from 0.1 to 10 wt.%, more preferably from 0.1 to 1 wt.%.

The acidic liquid composition of the present invention is a liquid in which the above three components (a) to (c) dissolved in a solvent. Preferable example of the solvent is water. Generally, water with high hardness tends to accelerate the corrosion of metal. However, it was observed that, as shown in the EXAMPLES of the acidic liquid composition of the present invention has an excellent effect of suppressing corrosion of metal based on aluminum, even when the acidic liquid composition was prepared using water having a relatively high hardness of approximately 400 hours per million concentration of calcium carbonate and 280 hours/million chlorine concentration. Therefore, we can assume that the acidic liquid composition of the present invention can fully exhibit the effect to suppress corrosion for metal based on aluminum is, if the hardness is at least in the interval from 0 to 400 hours/million concentration of calcium carbonate and at least in the interval from 0 to 280 hours/million chlorine concentration.

If there are problems, such as deposition, (d) an additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers may optionally be mixed in an acidic liquid composition of the present invention.

Here chelating tool used to chelation of metals such as calcium and magnesium ion copper(II)ion iron(II)ion iron(III and manganese ion in tap water. Specifically, examples of the chelating means are ethylenediaminetetraacetate and salt hydroxyethylphosphonate acid, preferably Terentieva salt hydroxyethylphosphonate acid. Such chelating agent can be applied with relative content, which can achieve the above purposes. Chelating agent can be used at a concentration of applications from 0.01 to 1 wt.%, preferably from 0.01 to 0.5 wt.% 100 wt.% acidic liquid composition, although not limited to these values.

The stabilizing means is used to stabilize the disinfectant or sterilizing agent, such as peracetic acid and peroxide in Dorada. Specifically, examples of the stabilizing means are surfactants and solubilizing means. Preferably the stabilizing agent is a propylene glycol or butyleneglycol. Such stabilizing means can be applied with relative content, which allows to achieve the above purposes. The stabilizing means may be used so that its concentration for use in the acidic liquid composition (100 wt%) is from 0.1 to 1 wt.%, preferably from 0.2 to 0.3 wt.%, although not limited to these values.

Examples of the preservative is benzoic acid or its salt (for example, salt of an alkali metal such as sodium benzoate), hexyleneglycol etc. Preservative can be applied in such a way that its concentration for use in the acidic liquid composition (100 wt%) ranges from 0.001 to 0.1 wt.%, although not limited to these values.

The regulator and the pH buffer is used to adjust the pH of the acidic liquid composition to a value less than 7, preferably up to being in the range from pH 1 to 6, more preferably in the range from pH 2 to 6, and optionally, preferably in the range from pH 3 to 5, and not specifically limited to a certain value, because the pH of the acidic liquid composition is in the above intervals. oncrete, examples of the pH regulator include potassium hydroxide and sodium hydroxide, and examples of the buffer include phosphate. Preferably the buffer is a tri-sodium phosphate or dailypost.

The acidic liquid composition of the present invention can be obtained by mixing (a) acidic oxidant, (b) nitric acid or a salt thereof and (c) carboxylic acid or its salts, as described above, and regulation, as necessary, the pH of the liquid composition through the buffer and regulator of pH so that the pH is less than 7, preferably a pH of from 1 to 6, more preferably pH 2 to 6, and optionally, preferably pH 3 to 5. On the stage, in addition to the above components (a)to(c)above (d) an additive, such as described above, the chelating agent and the stabilizing agent may be involved if necessary.

The acidic liquid composition of the present invention, thus obtained, has excellent disinfecting and sterilizing effect against bacteria, acid-fast bacteria, fungi, viruses and spores, based on the action (a) acidic oxidant. Specifically, the acidic liquid composition of the present invention, containing peracetic acid at a concentration equal to at least the 0.05 wt.%, preferably 0.2 wt.%and more preferably 0.3 wt.%, as the (a) acidic oxidant, has excellent sterilizing effect against bacteria, including gram-negative bacteria and gram-positive bacteria (Staphylococcus aureus,Enterococcus faecium,Escherichia coli,Pseudomonas aeruginosa), spores of bacillus subtilis (Bacillus subtilis), acid-fast bacteria (Mycobacterium terrae) and fungi (Candida albicansorAspergillus spp). Additionally, the acidic liquid composition of the present invention has the characteristic property of suppressing corrosion of metals on the basis of aluminum, such as aluminum and aluminum alloys.

Accordingly, the acidic liquid composition of the present invention can effectively disinfect or sterilize the object of metal based on aluminum or an object containing the metal based on aluminum in part, at the same time, preventing corrosion, such as rust or oxide film, and, thus, is particularly applicable as a disinfectant or sterilizing agent for this object. Preferable example of an object made of metal based on aluminum, or object that contains part of the metal based on aluminum, is a medical instrument such as an endoscope, although not limited to this.

As described above, the acidic liquid composition of the present invention which engages the composition, containing (a) acidic oxidant, (b) nitric acid or its salt and (c) carboxylic acid or its salt with the following concentrations of the application. In relation to (a) acidic oxidant, in the case of peracetic acid, peracetic acid: 1 wt.% or less, preferably from 0.05 to 1 wt.% (as the concentration of the equilibrium mixture generated from the peracetic acid); in the case of hydrogen peroxide, hydrogen peroxide: 15 wt.% or less, preferably from 3 to 15 wt.%; or in the case of peracetic acid and hydrogen peroxide, used in combination, peracetic acid: 1 wt.% or less, preferably from 0.05 to 1 wt.% (as the concentration of the equilibrium mixture generated from the peracetic acid), hydrogen peroxide: 2 wt.% or less, preferably from 0.05 to 1 wt.%; (b) nitric acid or its salt is from 0.1 to 10 wt.%; and (c) carboxylic acid or its salt is from 0.1 to 30 wt.%. However, the acidic liquid composition is not limited. The acidic liquid composition of the present invention can provide a concentrate of the acid liquid composition that is diluted before applying to the finding in the above-described concentration intervals. The degree of dilution is not specifically restricted, but it may range from 20 to 300 times.

Examples of concentrations of (a) acidic oxidant, (b) nitric acid or a salt thereof and (c) arbonboy acid or a salt thereof in the acidic liquid composition of the type of concentrate (type, diluted before use) include the following. In relation to (a) acidic oxidant, in the case where peracetic acid is used separately, peracetic acid: 15 wt.% or less, preferably from 5 to 15 wt.% (both values when the concentration of the equilibrium mixture generated from the peracetic acid); in the case where hydrogen peroxide is used separately, hydrogen peroxide: 30% by weight or less, preferably from 3 to 15 wt.%; or in the case where peracetic acid and hydrogen peroxide are used in combination, peracetic acid: 15 wt.% or less, preferably from 5 to 15 wt.% (both values when the concentration of the equilibrium mixture generated from the peracetic acid), hydrogen peroxide: 30% by weight or less, preferably from 7 to 22 wt.%; (b) nitric acid or its salt is from 2 to 30 wt.%; and (c) carboxylic acid or its salt is from 2 to 30 wt.%.

(II)The combined product

As described above, the acidic liquid composition of the present invention can provide a composition, which includes pre (a) acidic oxidant, (b) nitric acid or its salt (product of nitric acid) and (c) carboxylic acid or its salt (the product carboxylic acid); and optionally (d) at least one additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and Boo the development. However, the present invention may be a combined product of the acid composition (1)containing (a) acidic oxidant, and composition (2)containing (b) the product of nitric acid, (c) the product carboxylic acid, and (d) at least one additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers, and the acid composition (1) composition (2) are contained in separate containers, respectively. Example aspects of the combined product is the product of the industrial market in the form of a product of two parts or product-set, which is composed of the acid compositions (1) and composition (2)contained and individually packaged in separate containers; and the consumer mixes them before use.

There may be used an acid oxidizing agent, nitric acid or its salt, carboxylic acid or its salt, a chelating agent, a stabilizing agent, a preservative, a pH regulator and a buffer described in (I).

Acid composition (1) composition (2)contained and individually packaged in separate containers, can be mixed before use, diluted with water as required, and thereby obtained as an acid liquid composition described above in (I); and, thus, is and can be used as a disinfectant or stabilizowanego funds. Compositions (1) and (2) may be in liquid form or may be in solid form such as powder, granule, tablet, etc.

The relative content of (a) acidic oxidant in acidic compositions (1) and relative abundance (b) product of nitric acid, (c) product carboxylic acid and (d) an extension component composition (2) is not limited to specific values of the relative content; and can be any relative content that provide the acidic liquid composition of the present invention described in (I), when (1) and (2) are mixed and optionally diluted before use with water or the like, as necessary.

Specifically, in the case where the acid composition (1) includes one of peracetic acid and hydrogen peroxide as the (a) acidic oxidant, the combined product of the present invention may be any combination product, which is produced for use in applications where acid composition (1) composition (2) is mixed before use, and diluted as necessary, as follows. In respect of (a) acidic oxidant, in the case of peracetic acid, peracetic acid: 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% (the final composition contains an equilibrium mixture, generiruemoi is of peracetic acid with relative content, equal to 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.%), or in the case of hydrogen peroxide, hydrogen peroxide: 15 wt.% or less, preferably from 3 to 15 wt.%, more preferably from 3 to 7.5 wt.%; (b) the product of nitric acid, from 0.1 to 10 wt.%, preferably from 0.1 to 5 wt.%, more preferably from 0.1 to 1 wt.%; and (c) the product of a carboxylic acid: from 0.1 to 30 wt.%, preferably from 0.1 to 10 wt.%, more preferably from 0.1 to 1 wt.%. Additionally, preferably, in respect of the combined product, the acid composition (1) composition (2) is mixed before use and diluted, as necessary, in such a way that regulate pH in the range of from 1 to 6; and when you are mixing a chelating agent, its concentration to regulate from 0.01 to 0.5 wt.%.

Examples of the combined product are products that contain as the acid composition (1), peracetic acid relative content of 15 wt.% or less, preferably from 5 to 15 wt.%, more preferably from 6 to 15 wt.% (the final composition (1) contains an equilibrium mixture generated from the peracetic acid relative content of 15 wt.% or less, preferably from 5 to 15 wt.%, more preferably from 6 to 15 wt.%); or hydrogen peroxide with a relative content equal to 30 mA is.% or less, preferably from 3 to 15 wt.%, more preferably from 7 to 15 wt.%. Additionally, examples of the combined product are products that contain: composition (2), (b) the product of nitric acid relative content equal to from 2 to 30 wt.%, preferably from 2 to 20 wt.%, more preferably from 2 to 10 wt.%; and (c) the product is a carboxylic acid with a relative content of equal to from 2 to 30 wt.%, preferably from 2 to 20 wt.%, more preferably from 2 to 10 wt.%.

In addition, as another aspect, in the case where the acid composition (1) contains both of peracetic acid and hydrogen peroxide as the (a) acidic oxidant, the combined product of the present invention may be any combination product, which is produced for use in the following way. Acid composition (1) composition (2) is mixed before use and diluted, as necessary, so that the concentration of (a) peracetic acid is equal to 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% (the final composition contains an equilibrium mixture generated from the peracetic acid relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.%); the concentration of peroxide is odorata is 2 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.%; concentration (b) product of nitric acid is from 0.1 to 10 wt.%, preferably from 0.1 to 5 wt.%, more preferably from 0.1 to 1 wt.%; the concentration (c) of the product carboxylic acid is from 0.1 to 30 wt.%, preferably from 0.1 to 10 wt.%, more preferably from 0.1 to 1 wt.%. Additionally, preferably, in respect of the combined product, the acid composition (1) composition (2) is mixed before use and diluted, as necessary, in such a way that regulate pH in the range of from 1 to 6; and when you are mixing a chelating agent, its concentration to regulate from 0.01 to 0.5 wt.%.

Examples of the combined product are products that contain as the acid composition (1), peracetic acid relative content of 15 wt.% or less, preferably from 5 to 15 wt.%, more preferably from 6 to 15 wt.%, (acid composition (1) contains an equilibrium mixture generated from the peracetic acid relative content of 15 wt.% or less, preferably from 5 to 15 wt.%, more preferably from 6 to 15 wt.%); and hydrogen peroxide, with a relative content of 30 wt.% or less, preferably from 7 to 22 wt.%, more preferably from 8 to 22 wt.%. Additional examples of combiner the bath product are products, which contain: composition (2), (b) the product of nitric acid relative content equal to from 2 to 30 wt.%, preferably from 2 to 20 wt.%, more preferably from 2 to 10 wt.%; and (c) the product is a carboxylic acid with a relative content of equal to from 2 to 30 wt.%, preferably from 2 to 20 wt.%, more preferably from 2 to 10 wt.%.

(III)The method of disinfection

The method of disinfection of the present invention can be carried out by processing the object by using the acidic liquid composition containing (a) acidic oxidant, (b) nitric acid or its salt (product of nitric acid) and (c) carboxylic acid or its salt (the product of a carboxylic acid)as described above. Acidic liquid composition may be a composition which additionally contains (d)at least one additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers as needed.

Examples of concentrations of (a) acidic oxidant, (b) product of nitric acid and (c) the product carboxylic acid in the acidic liquid compositions for application to disinfection treatment facility include the following. In respect of (a) acidic oxidant, in the case where peracetic acid is used separately, peracetic acid: 0.05 to 1 wt.%, p is edocfile from 0.05 to 0.5 wt.%, (the equilibrium mixture generated from the peracetic acid is found in the relative content is from 0.05 to 1 wt.%, preferably from 0.05 to 0.5 wt.%); in the case where hydrogen peroxide is used separately, hydrogen peroxide: 3 to 15 wt.%, preferably from 3 to 7.5 wt.%; or, in the case where peracetic acid and hydrogen peroxide are used in combination, peracetic acid: 0.05 to 1 wt.%, preferably from 0.05 to 0.5 wt.% (the equilibrium mixture generated from the peracetic acid is found in the relative content is from 0.05 to 1 wt.%, preferably from 0.05 to 0.5 wt.%), and hydrogen peroxide: from 0.05 to 1 wt.%, preferably from 0.05 to 0.5 wt.%; (b) nitric acid or its salt is from 0.1 to 10 wt.% (preferably from 0.1 to 5 wt.%); and (c) carboxylic acid or its salt is from 0.1 to 30 wt.% (preferably from 0.1 to 10 wt.%).

In the case where the chelating agent is contained in the acidic liquid composition for use in disinfecting treatment of the object, examples of its content is from 0.01 to 1 wt.%, preferably from 0.01 to 0.5 wt.%. In the case where the stabilizing agent is contained in the acidic liquid composition, examples of its content is from 0.1 to 1 wt.%, preferably from 0.2 to 0.3 wt.%.

Preferably, as described above, the acidic liquid composition has an excellent effect of suppressing the interviewer is Ziya aluminum, an example of the object to be processed is an object that is made of metal based on aluminum or contains them in part. Preferable examples of these are medical instruments such as an endoscope.

Examples of the method include disinfection of the way in which the object is brought into contact with the acidic liquid composition of the present invention. Specifically, examples include a method in which the object is immersed in the acidic liquid composition of the present invention, the way in which the acidic liquid composition of the present invention is sprayed and applied on the object, the way in which to ensure the passage of the object through the acidic liquid composition of the present invention, and the manner in which the object is wiped with a sheet or the like, which is soaked in the acidic liquid composition of the present invention.

(VI)The method of suppressing corrosion of activity with respect to aluminum

The present invention provides a method of suppressing corrosion activity of acid oxidizing agent such as peracetic acid or hydrogen peroxide, relative to the aluminum. The method can be carried out using (a) acidic oxidant in combination with the above-described (b) nitric acid or its salt (product of nitric acid) and above (c)at least one carboxylic acid is, selected from the group consisting of monocarboxylic acids, dicarboxylic acids and tricarboxylic acids, or its salt (the product of a carboxylic acid).

Examples of concentrations of (a) acidic oxidant is listed as follows. In the case where peracetic acid is used separately, peracetic acid: 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% (the equilibrium mixture generated from the peracetic acid is contained in the relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.%); in the case where hydrogen peroxide is used separately, hydrogen peroxide: 15 wt.% or less, preferably from 3 to 15 wt.%, more preferably from 3 to 7.5 wt.%. In the case where peracetic acid and hydrogen peroxide are used in combination, peracetic acid: 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.% (the equilibrium mixture generated from the peracetic acid is found in the relative content of 1 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.%), hydrogen peroxide: 2 wt.% or less, preferably from 0.05 to 1 wt.%, more preferably from 0.05 to 0.5 wt.%.

Examples of the relative content of (b) product of nitric acid for use in the to the munali (a) acidic oxidant at the concentrations described above represent the relative content that can reach the concentration range from 0.1 to 10 wt.%, when (b) the product of nitric acid and (c) the product of carboxylic acid is used in combination with the (a) acidic oxidant. Preferably, examples of the relative content of (b) product of nitric acid are values relative content that, when used in combination, achieve concentration (b) product of nitric acid, from 0.1 to 5 wt.%, more preferably from 0.1 to 1 wt.%. Additionally, examples of the relative content of (c) product carboxylic acids for use in combination with the (a) acidic oxidant are relative content that, when (b) the product of nitric acid and (c) the product of carboxylic acid is used in combination with the (a) acidic oxidant, reach a concentration range from 0.1 to 30 wt.%. Preferable examples of such relative contents are relative content, which when used in combination, achieve concentration (c) of the product carboxylic acid from 0.1 to 10 wt.%, more preferably from 0.1 to 1 wt.%.

Thus, corrosive towards aluminum acid oxidizing agents such as peracetic acid and hydrogen peroxide, can be suppressed; and in the cut is ltate disinfectant or sterilizing agent, containing an acid oxidizing agent as an active ingredient, can be applied for disinfection or sterilization of an object, which is made of metal based on aluminum or contains their part, such as a medical instrument such as an endoscope.

EXAMPLES

The present invention will be described with more detail with reference to Experimental examples below. It should be noted that the Experimental examples below are simply examples to facilitate description of the present invention and are not intended to limit, in any way, the scope of the claims of the present invention.

It should be noted that, in the Experimental examples below, when you get a composition comprising an acid oxidizing agent (aqueous solution), then use artificial hard water whose hardness is 400 hours per million concentration of calcium carbonate and 280 hours/million chlorine concentration to accelerate corrosion. In the Experimental examples below, peracetic acid used in the preparation of the test fluid, exists as an equilibrium mixture of acetic acid and hydrogen peroxide in the composition containing an acid oxidizing agent (aqueous solution). Therefore, the concentration (m/m%) peracetic acid, are listed in the tables is x 2, 4, 12, 14, 15, 16, and 18, in the Experimental examples below, means the concentration (m/m%) equilibrium mixture generated from the peracetic acid in the composition containing an acid oxidizing agent (aqueous solution).

Experimental example 1

(1) the Object

Test samples (1.1 mm thickness × 15 mm diameter, round shape)made of aluminum alloys of the 5000 series (A5052, A5056) and aluminum alloy of 6000 series (A6061), used as objects (objects 1 to 3). The composition of these metals aluminum alloys are given in table 1.

(2) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid. Aqueous solutions containing an acid oxidant (Test fluid from 1 to 15), containing potassium nitrate and citric acid, with a relative concentrations, are shown in table 2 in addition to peracetic acid with a concentration of 0.3 m/m%, were prepared using the above-described artificial hard water. The test liquid is from 2 to 15 regulated to convey it to the appropriate pH values shown in table 2, using a pH regulator (see table 2).

0,3
Table 2
The test fluid Peracetic acid (m/m%)Potassium nitrate (m/m%)Citric acid (m/m%)pHthe pH regulator
10,3002,7NO
20,3003,5KOH
30,3004,0KOH
40,300,83,5KOH
50,301,23,5KOH
60,30,103,5KOH
70,10,83,5KOH
80,30,11,23,5KOH
90,30,203,5KOH
100,30,20,83,5KOH
110,30,21,23,5KOH
120,30,403,5KOH
130,30,40,83,5KOH
140,30,4 1,23,5KOH
150,310303,5KOH

(3) Test for corrosivity

The above three objects 1-3 (test samples A5052, A5056 and A6061) was dipped in the above aqueous solutions containing acid oxidizer (Test fluid 1-15) (room temperature 20 to 25°C). After seven days (1 week) these test samples were removed and the degree of corrosion was observed on changing the appearance and the weight loss percentage (%).

(3-1) the Change in appearance

The appearance of each object was observed by visual evaluation, and change the appearance was evaluated using the criteria below.

: no rust or oxide film not see.

○: the relative content of rust or oxide film is less than 10% of total surface area (100%) of the object.

: the relative content of rust or oxide film is 10 to 50% by total surface area (100%) of the object.

▲: relative abundance of rust or oxide film is more than 50% of the total area p of the surface (100%) of the object.

×: rust or oxide film clearly see on the full surface area of the object.

(3-2) the mass Loss percentage (%)

The mass of each object was measured before and after immersion and the mass loss percentage (%) was calculated using the formula below.

Formula 1

weight loss percentage (%) =

(the mass of an object before the dive - the mass of an object after a dive/object mass before immersion×100

Table 3 shows the degree of corrosion (change the appearance and weight loss in percentage terms (%)) for objects after immersion in the Test liquid.

Table 3
The test fluidObject 1Object 2Object 3
Sample A5052Sample A5056Sample A6061
Weight loss percentageThe change in appearanceWeight loss percentage The change in appearanceWeight loss percentageThe change in appearance
1to 3.58%×4,34%×4.26 per cent×
22,10%×3,38%×3,29%×
31,90%×3,07%×2,72%×
42,69%×3,54%×the 3.89%
52,97%×3,42%×3,43%
60,13% 0,07%2,50%
70,09%0,30%3,28%
80,08%0,10%2,93%
90,03%×-0,03%×0,03%×
100,07%0,12%0,07%
110,06%0,10% 0,12%
120,03%×-0,05%×-0,06%×
130,05%0,10%0,05%
140,05%0,08%0,02%
15-0,02%0,00%0,00%

As can be seen from the above results, it was shown the following. When both nitrate and citric acid admixed in addition to peracetic acid(Test fluid 7-8, 10-11 and 13-15), corrosion of the object (change the appearance (occurrence of rust, oxide film), weight loss) was significantly suppressed in comparison with the case where neither nitrate nor citric acid does not mix with peracetic acid (Test fluid : 1-3), the case where admixed only nitrate and citric acid do not mix (Test fluid 6, 9, 12), and case mix only citric acid and nitrate do not mix (Test fluid 4-5).

Specifically, in the case where neither nitrate nor citric acid does not mix with peracetic acid (Test fluid : 1-3), the obvious rust or oxide film was observed on the full surface area of each object. Moreover, the mass loss as a percentage tended to increase with decreasing pH. Additionally, in cases where citric acid is admixed to the Test liquid 2 (Test fluid 4-5), the effect of suppressing corrosion were not observed. In the case where the nitrate was mixed into in addition to peracetic acid (Test fluid 4-5, 6, 9, 12), was observed a tendency of suppression of weight loss. However, rust or oxide film was observed from 50 to 100% of the total surface area of each object, and the good effect of suppressing corrosion were not observed.

On the contrary, in the case where both nitrate and citric acid was mixed into in addition to peracetic acid is, not only decreased the mass loss in percentage terms, but additionally did not observe almost no change in appearance (occurrence of rust, oxide film), and observed a clear effect of suppressing corrosion. The effect of suppressing corrosion was improved as the amount of nitrate and citric acid added to the solution containing the acidic oxidant, grew, and between them there was a correlation.

Experimental example 2

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid. Specifically, as shown in table 4, were obtained aqueous solutions containing acid oxidizer (pH 4-6) (Test fluid 16-18), each of which was mixed into potassium nitrate (1 m/m%) and citric acid (1 m/m%) in addition to peracetic acid (1 m/m%), using the above-described artificial hard water. the pH was adjusted using potassium hydroxide. For comparison was obtained aqueous solutions containing acid oxidizer (pH 4-6) (Test fluid 19-20), each of which was mixed into peracetic acid (1 m/m%), without potassium nitrate or citric acid, using artificial hard water and potassium hydroxide.

(2) Test for corrosivity

Object 1 (the tested sample A5052) (the same type that was used in the Experimental examples is e 1) were immersed in aqueous solutions, containing acidic oxidant (Test fluid 16-20) (room temperature 20 to 25°C), similarly as in Experimental example 1, and were removed after three days. Then the degree of corrosion was studied by changing the appearance and the weight loss percentage (%)using the same criteria that was used in Experimental example 1.

Table 4 shows the degree of corrosion (change the appearance and weight loss in percentage terms (%)) of the object 1, is immersed in each test fluid.

Table 4
The test fluidPeracetic acid (m/m%)Potassium nitrate (m/m%)Citric acid (m/m%)pHWeight loss percentage
(%)
The change in appearance
1611140,02
17111 6-0,02
181118-0,01
191004-6,54×
201006-1,22×

As can be seen from the table, it was observed that the corrosion of aluminum (weight loss, change in appearance (the appearance of rust, oxide film)) due to the action of peracetic acid having a high concentration (1 m/m%)was significantly inhibited by exposure to nitrate and carboxylic acids (citric acid) in combination.

Experimental example 3

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used hydrogen peroxide. Specifically, as shown in table 5, were obtained aqueous solutions containing acid oxidizer (pH 5-6) (Test fluid 21-22), in each of which the potassium nitrate (2 m/m%) and citric acid (2 m/m%) was mixed into in addition to hydrogen peroxide (15 m/m%), using the above-described artificial hard water. the pH was adjusted using potassium hydroxide. For comparison was obtained aqueous solutions containing acid oxidizer (pH 5-6) (Test fluid 23-24), each of which was mixed into hydrogen peroxide (15 m/m%) without potassium nitrate or citric acid, using artificial hard water and potassium hydroxide.

(2) Test for corrosivity

Object 1 (the tested sample A5052) (the same type that was used in Experimental example 1) was immersed in aqueous solutions containing an acid oxidant (Test fluid 21-24) (room temperature 20 to 25°C), similarly as in Experimental example 1, and were removed after three days. Then the degree of corrosion was studied by changing the appearance and the weight loss percentage (%)using the same criteria that was used in Experimental example 1.

Table 5 shows the degree of corrosion (change the appearance and the weight loss percentage (%)of each object.

Table 5
The test fluidHydrogen peroxide (m/m%) Potassium nitrate (m/m%)Citric acid (m/m%)pHWeight loss percentage (%)The change in appearance
2115225-0,04
2215226-0,04
2315005to-0.05×
2415006-0,03

As can be seen from the table, it was observed that the corrosion of aluminum (weight loss, change in appearance (the appearance of rust, oxide film)) due to de the effects of hydrogen peroxide, having a high concentration (15 m/m%)was significantly depressed (Test fluid 21-22) when using nitrate and carboxylic acids (citric acid) in combination.

Experimental example 4

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid. Specifically, received aqueous solutions containing an acid oxidant, which was mixed into peracetic acid (0.3 m/m%), potassium nitrate (10 m/m%) and carboxylic acids listed in table 6 (malic acid, succinic acid, lactic acid), using the above-described artificial hard water; and the final pH was adjusted to pH 3.5 using a solution of potassium hydroxide (Test fluid 25-28; however, the Test Liquid 25 did not contain any carboxylic acid).

Table 6
The test fluidCarboxylic acidthe pH of the final aqueous solution containing an acid oxidizing agent
TypePeremeshivaemogo number (m/m%)
25-0 3,5
26malic acid10,53,5
27succinic acid2,73,5
28lactic acid14,13,5

(2) Test for corrosivity

Objects 1-3 (test samples A5052, A5056, A6061) (of the same type as that used in Experimental example 1) was immersed in aqueous solutions containing an acid oxidant (Test fluid 25-28) (room temperature: 20 to 22°C), similarly as in Experimental example 1, and were removed after seven days (after 1 week). Then the degree of corrosion was studied by changing the appearance and the weight loss percentage (%)using the same criteria that was used in Experimental example 1.

Table 7 shows the degree of corrosion (change the appearance and weight loss in percentage terms (%)) for objects immersed in the test fluid.

Table 7
The test fluid Object 1Object 2Object 3
Sample A5052Sample A5056Sample A6061
Weight loss percentageThe change in appearanceWeight loss percentageThe change in appearanceWeight loss percentageThe change in appearance
250,00%0,02%×0,07%×
26-0,01%-0,10%-0,12%
270,02%0,02%
28-0,01%0,03%-0,02%

As can be seen from the table, the effects of suppression of corrosion (reduction of weight loss in percentage terms, the suppression of changes in appearance (the appearance of rust, oxide film)) was also observed in the case where malic acid, succinic acid or lactic acid was used as the carboxylic acid used in combination with nitrate; as in the case where used citric acid.

Experimental example 5

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used hydrogen peroxide. Specifically, received aqueous solutions containing acid oxidizer (Test fluid 29-31) (pH 3.5), in which the potassium nitrate and citric acid was mixed into the relative contents shown in table 8, in addition to hydrogen peroxide 7.5 m/m%, using the above-described artificial hard water. Test LM the bone 31 was adjusted to pH 3.5, using potassium hydroxide.

Table 8
The test fluidHydrogen peroxide
(m/m%)
Potassium nitrate (m/m%)Citric acid (m/m%)pH
297,500,13,5
307,520,13,5
317,5223,5

(2) Test for corrosivity

Objects 1-3 (test samples A5052, A5056, A6061) (of the same type as that used in Experimental example 1) was immersed in aqueous solutions containing an acid oxidant (Test fluid 29-31) (room temperature 20 to 25°C), similarly as in Experimental example 1, and were removed after seven days (after 1 week). Then the degree of corrosion was studied by changing the appearance and the weight loss percentage (%)using the same to whom iteria, which was used in Experimental example 1.

Table 9 shows the degree of corrosion (change the appearance and weight loss in percentage terms (%)) for objects immersed in the test fluid.

Table 9
The test fluidObject 1Object 2Object 3
Sample A5052Sample A5056Sample A6061
Weight loss percentageThe change in appearanceWeight loss percentageThe change in appearanceWeight loss percentageThe change in appearance
29-0,04%-0,06%-0,03%
30-0,01%-0,03%0,00%
31-0,06%-0,07%-0,02%

As can be seen from the table, it was observed that in the case where the pH was adjusted to 3.5 using hydrogen peroxide as an acid oxidant, despite the fact that the weight loss of aluminum alloys was small, had a change of appearance (the appearance of rust, oxide film) (Test fluid 29). On the contrary, observed that such a change in appearance (the appearance of rust, oxide film) was clearly reduced with the use of nitrate and carboxylic acid in combination with hydrogen peroxide (Test fluid 30 and 31).

Experimental example 6

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used hydrogen peroxide. Specifically, received aqueous solutions containing acid on elitel (Test fluid 32-33), each of which was mixed into the potassium nitrate and citric acid with a relative concentrations shown in table 10, in addition to hydrogen peroxide 3 m/m%, using the above-described artificial hard water. Each test liquid was adjusted to pH 2 using nitric acid.

Table 10
The test fluidHydrogen peroxide
(m/m%)
Potassium nitrate
(m/m%)
Citric acid
(m/m%)
pH
323012
333112

(2) Test for corrosivity

Object 1 (the tested sample A5052) were immersed in aqueous solutions containing an acid oxidant (Test fluid 32 and 33) (room temperature 20 to 25°C), similarly as in Experimental example 1, and were removed after 24 hours. Then the degree of corrosion was studied by changing the appearance and the weight loss percentage (%), COI is lsua the same criteria which was used in Experimental example 1. Table 11 shows the degree of corrosion (change the appearance and weight loss in percentage terms (%)) of the object 1, is immersed in each test fluid. It should be noted that the results given below are average values obtained from two samples of the object (n=2).

Table 11
The test fluidObject 1
Sample A5052
Weight loss percentageThe change in appearance
320,09%×
33-0,05%

As can be seen from the table, it was observed that, in the case where the acidic oxidant used hydrogen peroxide, even when hydrogen peroxide had a low concentration of 3 wt.%, had a change of appearance (the appearance of rust, oxide film) (Test fluid 32). Observed that this change in appearance (the appearance of rust, oxide film) b is lo significantly suppressed (Test fluid 33) when using nitrate and carboxylic acids (citric acid) in combination with hydrogen peroxide.

Experimental example 7

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid. Specifically, received aqueous solutions containing acid oxidizer (Test fluid 34-37)containing nitric acid and citric acid with a relative concentrations shown in table 12, in addition to peracetic acid 0.3 m/m%, using the above-described artificial hard water. Test fluid 34 and 35 was adjusted to pH 1, and the Test fluid 36 and 37 was adjusted to pH 2 using potassium hydroxide.

Table 12
The test fluidPeracetic acid
(m/m%)
Nitric acid
(m/m%)
Citric acid
(m/m%)
pH
340,3201
350,3221
360,32 02
370,3222

(2) Test for corrosivity

Objects 1-3 (test samples A5052, A5056 and A6061) were immersed in aqueous solutions containing an acid oxidant (Test fluid 34-37) (room temperature 20 to 25°C), similarly as in Experimental example 1, and were removed after seven days (after 1 week). Then the degree of corrosion was investigated by changing the appearance and the weight loss percentage (%)using the same criteria as in Experimental example 1

Table 13 shows the degree of corrosion (change the appearance (the appearance of rust, oxide film) and the mass loss percentage (%)) for objects immersed in the test fluid.

Table 13
The test fluidObject 1Object 2Object 3
Sample A5052Sample A5056 Sample A6061
Weight loss percentageThe change in appearanceWeight loss percentageThe change in appearanceWeight loss percentageThe change in appearance
34-0,89%-0,90%-0,74%
35-0,15%-0,33%-0,27%
36-0,17%-0,14%-0,08%
37-0,07% -0,07%-0,03%

As shown in the table, the weight loss of aluminum alloys tended to increase with increasing acidity of aqueous solutions containing acid oxidizer. However, it was observed that the mass loss and the change in appearance (the appearance of rust, oxide film) of aluminum alloys was suppressed when using nitric acid or nitric acid in combination with a carboxylic acid.

Experimental example 8

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid. Specifically, received aqueous solutions containing acid oxidizer (Test fluid 38-43), in which nitric acid and citric acid was mixed into the relative contents shown in table 14, in addition to low concentrations of peracetic acid, from 0.001 to 0.01 m/m% (10 hours/million, 50 hours/million 100 h/m), using the above-described artificial hard water. Each test liquid was adjusted to pH 2 using potassium hydroxide.

Table 14
The test fluid Peracetic acid
(m/m%)
Nitric acid
(m/m%)
Citric acid
(m/m%)
pH
380,001002
390,0010,10,12
400,005002
410,0050,10,12
420,01002
430,010,10,12

(2) Test for corrosivity

Object 1 (the tested sample A5052) were immersed in aqueous solutions containing an acid oxidant (Test fluid 38-43) (room temperature 20 to 25°C), similarly as in the EC the pilot example 1 and removed after 24 hours. Then the degree of corrosion was investigated by changing the appearance and the weight loss percentage (%)using the same criteria as in Experimental example 1.

Table 15 shows the degree of corrosion (change the appearance (the appearance of rust, oxide film) and the mass loss percentage (%)) of the object 1, is immersed in the test fluid.

Table 15
The test fluidThe concentration of peracetic acid (m/m%)Object 1
Sample A5052
Weight loss percentageThe change in appearance
380,001-0,01%
390,0010,05%
400,005-0,09%
410,03%
420,01-0,07%
430,01-0,06%

As shown in the table, the weight loss of the aluminum alloy had a tendency to increase with increasing acid concentration of the oxidant in each aqueous solution containing an acid oxidant (Test fluid 38-43). However, it was observed that the mass loss and the change in appearance (the appearance of rust, oxide film) aluminum alloy was suppressed when using a carboxylic acid in combination with nitric acid.

As can be seen from the table, it was observed that in the case where the acidic oxidant used peracetic acid, even when the peracetic acid had a low concentration of 10 h/m (0,001%by weight), had a slight change in appearance (the appearance of rust, oxide film) (Test fluid 38). In addition, the change in appearance became more obvious with increasing concentration of peracetic acid (Test liquid 42). Observed that such a change is outside the view (the appearance of rust, oxide film) was significantly suppressed (Test fluid 39, 41 and 43) when using nitrate and carboxylic acids in combination with peracetic acid.

Experimental example 9

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid and aqueous solutions containing acid oxidizer (pH 3,6) (Test fluid 44 and 45), having the respective compositions shown in table 16, was obtained with the use of artificial hard water.

Table 16
TrackThe test fluid 44The test fluid 45
Peracetic acid0,080,08
Potassium nitrate0,10,1
Citric acid0,20,01
Citric acid sodium salt-0,2
Conser is ant (benzoic acid Na) 0,00250,0025
The pH regulator (potassium hydroxide)0,1-
Chelating agent (HEDP·4Na)-0,02
pH3,63,6
HEDP·4Na: Terentieva salt hydroxyethylphosphonate kilty

(2) Test for corrosivity

Object 1 (the tested sample A5052) were immersed in aqueous solutions containing an acid oxidant (Test fluid 44 and 45) (temperature: 45°C), similarly as in Experimental example 1, and were removed after 40 hours. Then the degree of corrosion was investigated by changing the appearance and the weight loss percentage (%)using the same criteria as in Experimental example 1.

Table 17 shows the degree of corrosion (change the appearance (the appearance of rust, oxide film) and the mass loss percentage (%)for object 1, is immersed in the test fluid.

Table 17
The test fluidObject 1
Sample A5052
Weight loss percentageThe change in appearance
44-0,06
45-0,13

As shown in table 17, it was observed that even in the case where additives such as a preservative and chelating agent, was entangled in acidic oxidant in addition to nitrate and carboxylic acid, however, effectively maintained the excellent effect of suppressing corrosion of aluminium (suppressing weight loss, suppressing changes in appearance (the appearance of rust, oxide film)) due to the combined application of nitrate and carboxylic acid.

Experimental example 10

(1) an Aqueous solution containing an acid oxidizing agent

As acidic oxidant used peracetic acid and was obtained an aqueous solution containing an acid oxidant (pH 3.5) (Test fluid 46)having a composition shown in table 18, using artificial hard water.

p>
Table 18
TrackThe test fluid 46
Peracetic acid0,3
Potassium nitrate0,4
Citric acid0,1
Buffer (trisodium phosphate)0,2
Chelating agent (HEDP·4Na)0,03
pH3,5
HPDP·4Na: Terentieva salt hydroxyethylphosphonate kilty

(2) Test for corrosivity

Objects 1 to 3 (sample A5052, A5056, A6061) was immersed in an aqueous solution containing an acid oxidant (Test fluid 46) (room temperature 20 to 25°C), similarly as in Experimental example 1. The test liquid was replaced with a new one every week, and the mass loss percentage (%) observed at each replacement. Through four weeks, the objects were removed. The degree of corrosion was investigated by changing the appearance and the weight loss percentage (%), IP is using the same criteria as in Experimental example 1

Table 19 shows degree of corrosion (change the appearance (the appearance of rust, oxide film) and the cumulative weight loss in percentage terms (%)) for each object.

Table 19
Test
the liquid 46
Sample
A5052
Sample A5056Sample A6061
Cumulative change
mass (%)
after 1 week-0,04-0,22-0,12
after 2 weeks-0,20-0,26-0,22
after 3 weeks-0,27-0,40-0,33
after 4 weeks0.39 per-0,53-0,40
The change in appearanceafter 4 weeks

As shown in table 19, it was observed that an excellent effect of suppressing corrosion of aluminium (suppressing weight loss, suppressing changes in appearance (the appearance of rust, oxide film)) due to the combined application of nitrate and carboxylic acid also effectively maintained for a long period of time in the case where the chelating agent and the buffer was entangled in acidic oxidant in addition to nitrate and carboxylic acid.

Examples of compounds

Examples of compounds 1-2

Consisting of one part of the sterilization/disinfection liquid

Was mixed into peracetic acid, hydrogen peroxide, potassium nitrate, citric acid, chelating agent and buffer and mixed them with relative contents shown in the following table, respectively, for receiving consisting of one part of the sterilization/disinfection of liquid that can be applied without dilution.

Table 20
(wt.%)
Example composition 1Example composition 2
eryasnaya acid 0,2%0,3%
Hydrogen peroxide0,3%0,4%
Potassium nitrate0,1%0,4%
Citric acid0,1%0,4%
Chelating agent (HEDP·4Na)0,01%0,1%
Buffer (trisodium phosphate)0,1%0,5%

Example of compound 3

Concentrated, consisting of two parts sterilization/disinfection liquid

The components were kneaded and mixed with water in accordance with the composition shown below, and were received the first liquid and the second liquid to be concentrated, consisting of two parts sterilization/disinfection liquid. Sterilization/disinfection liquid can be applied by mixing the first liquid, second liquid and water at a ratio of 1:1:18 before use.

<a First liquid>

peracetic acid 6 wt.%
hydrogen peroxide8 wt.%
waterbalance
only100 wt.%

<a Second liquid>

potassium nitrate8 wt.%
citric acid8 wt.%
chelating agent (HEDP·4Na)10 wt.%
buffer (trisodium phosphate)6 wt.%
the pH regulator (potassium hydroxide)0.5 wt.%
waterbalance
only100 wt.%

Example of part 4

Concentrated, consisting of two parts sterilization/disinfection liquid

The components were kneaded and mixed with water in accordance with the composition shown below, and were received the first liquid and the second liquid to be concentrated, consisting of two parts sterilization/disinfection liquid. Sterilization the Naya/disinfection liquid can be applied by mixing the first liquid, the second liquid and water in the ratio 1:3:296 before use.

<a First liquid>

peracetic acid15 wt.%
hydrogen peroxide22 wt.%
waterbalance
only100 wt.%

<a Second liquid>

potassium nitrate10 wt.%
citric acid10 wt.%
chelating agent (HEDP·4Na)10 wt.%
buffer (trisodium phosphate)5 wt.%
the pH regulator (potassium hydroxide)5 wt.%
waterbalance
only100 wt.%

1. Combination product containing:
(1) acidic composition comprising (a) peracetic acid or peracetic acid and hydrogen peroxide as the acid is of kalitala, moreover, the acid composition (1) is contained in the container; and (2) a composition containing (b) nitric acid or its salt, (c)at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid, or its salt, and (d)at least one additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers
moreover, the composition (2) is contained in a container other than the container acid composition (1);
acid composition (1) composition (2) is mixed before use so that the pH adjust to being in the interval from 2 to 6;
the combined product is a disinfectant or sterilizing agent for an object that contains all or part of the aluminum or aluminum alloy.

2. Combination product according to claim 1, where
acid composition (1) contains (a) acidic oxidant, with a relative content of:
when acidic oxidant is a peracetic acid: 5 to 15 wt.%; and
when acidic oxidant is a combination of peracetic acid and hydrogen peroxide: from 5 to 15 wt.% peracetic acid and from 7 to 22 wt.% peroxide of hydrogen.

3. Combination product according to claim 1, where
composition (2) with the contains (b) nitric acid or its salt, with a relative content of from 2 to 30 wt.% and (C) carboxylic acid or its salt, with a relative content of from 2 to 30 wt.%.

4. Combination product according to claim 2, where
composition (2) contains (b) nitric acid or its salt, with a relative content of from 2 to 30 wt.%, and (C) carboxylic acid or its salt, with a relative content of from 2 to 30 wt.%.

5. Combination product according to any one of claim 2 to 4, where acid composition (1) composition (2) is mixed before use so that the (a) acidic oxidant, (b) nitric acid or its salt, and (c) carboxylic acid or its salt is brought to the following concentrations:
(a) acidic oxidant:
when acidic oxidant is a peracetic acid: 0.05 to 1 wt.%;
when acidic oxidant is a combination of peracetic acid and hydrogen peroxide: from 0.05 to 1 wt.% peracetic acid and from 0.05 to 2 wt.% hydrogen peroxide;
(b) nitric acid or its salt is from 0.1 to 10 wt.%; and
(c) carboxylic acid or its salt is from 0.1 to 30 wt.%.

6. Combination product according to claim 4,
where the composition (2) contains a chelating agent, and an acid composition (1) composition (2) is mixed before use so that the relative content of the chelating means is from 0.01 to 0.5 wt.%.

7. Acidic liquid composition containing:
(a) peracetic acid or peracetic acid and hydrogen peroxide as an acid oxidant; and
(b) AZ is tnou acid or its salt; and
(c) at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid, or its salt;
acidic liquid composition has a pH in the range from 2 to 6; and the acidic liquid composition is a disinfectant or sterilizing agent for an object that contains all or part of the aluminum or aluminum alloy.

8. The acidic liquid composition according to claim 7, further comprising:
(d)at least one additive selected from the group consisting of chelating means, stabilizing agents, preservatives, pH regulators and buffers.

9. The acidic liquid composition of claim 8, which contains a chelating agent in the relative content of from 0.01 to 0.5 wt.%.

10. The method of obtaining the acidic liquid composition, which is a disinfectant or sterilizing agent for an object that contains all or part of the aluminum or aluminum alloy, and the method comprises the stage of:
mixing (a) peracetic acid or peracetic acid and hydrogen peroxide as acidic oxidant, (b) nitric acid, or a salt thereof, and (c)at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid, or a salt thereof; and shall regulirovanie pH to stay in the interval from 2 to 6.

11. The method of disinfection or sterilization, including the state of the processing object, comprising the metal based on aluminum as a component, using acidic liquid composition having a pH in the range from 2 to 6;
moreover, the acidic liquid composition contains:
(a) peracetic acid or peracetic acid and hydrogen peroxide as acidic oxidant, (b) nitric acid or its salt, and (c)at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid, or its salt.

12. The method of suppressing corrosion activity of acid oxidizer with respect to aluminum, where
(a) acidic oxidant, consisting of peracetic acid or peracetic acid and hydrogen peroxide, used in combination with
(b) nitric acid or its salt, and (c)at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid and citric acid, or its salt so that the pH adjust to being in the interval from 2 to 6.



 

Same patents:

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SUBSTANCE: invention refers to agriculture, preferentially to veterinary science and may be used on the onset and threatening extension of infectious diseases on cattle farms, production, processing and warehouse facilities, biological and food plants. A disinfectant for veterinary inspection facilities containing a water-disperse colour, alkyldimethylbenzylammonium chloride, tetramethylene diethylene tetramine and didecyldimethyl ammonium chloride in certain proportions.

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14 cl, 1 dwg, 17 tbl, 8 ex

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19 cl, 18 dwg, 7 ex, 1 tbl

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1 tbl, 1 ex

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1 tbl, 15 ex

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4 tbl, 1 ex

FIELD: medicine, pharmaceutics.

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4 tbl, 1 ex

FIELD: medicine.

SUBSTANCE: group of inventions refers to medicine, particularly to ophthalmology, namely: to antibacterial lenses containing metals, as well as to methods for producing them. The method for producing an antibacterial lens containing a metal salt involves the stages: (a) preparation of a hard lens by a salt precursor, as well as (b) preparation of the lens produced at the stage (a) by a disperse additive specified in a group consisting of polyvinylpyrrolidone, polyvinyl alcohol, glycerol and polyethylene oxide, and a metal-containing agent specified in a group consisting of silver tetrafluoroborate, silver sulphate, zinc acetate, zinc sulphate, copper acetate, copper sulphate, silver nitrate, manganese sulphide, zinc oxide, zinc sulphide, copper sulphide, copper phosphate, silver nitrate, silver sulphate, silver iodate, silver carbonate, silver phosphate, silver sulphide, silver chloride, silver chloride, silver bromide, silver iodide and silver oxide. The other method for producing involves the stages (a) of preparation of a hard lens by a metal-containing agent, and a disperse agent, (b) preparation of the lens prepared at the stage (a) by a salt precursor. The antibacterial lens containing the metal salt is produced by said methods.

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16 cl, 1 tbl

FIELD: medicine, pharmaceutics.

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3 cl, 1 tbl, 1 ex

FIELD: medicine.

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Disinfectant // 2466743

FIELD: medicine.

SUBSTANCE: disinfectant containing a chlorinated derivative of isocyanuric acid and a gas-yielding mixture comprises a polymer ingredient specified in a group consisting of polyvinyl alcohol, polyacrylic acid and its copolymers, polyvinylpyrrolidone, water-soluble cellulose esters and their mixture in the following proportions, wt %: chlorinated derivative of isocyanuric acid 20-90, polymer ingredient 0.1-5, gas-yielding mixture - the rest. The gas-yielding mixture represents a mixture of base and acid ingredients. The base ingredient of the disinfectant contains alkaline or alkaline-earth salts of carbonic acid or their mixture. As the acid ingredient, the disinfectant contains organic acids, may contain anticorrosion additives, e.g. sodium benzoate, sodium nitrite, calcium formate, zinc compounds. The disinfectant may contain a builder that is a non-ionic surfactant on the basis of oxyethylated derivatives of alcohols, phenols or organic acids, complexons - salts of ethylenediaminotetraacetic acid, a neutral excipient, e.g. sodium phosphate, sodium sulphate, sodium tartrate, sodium acetate.

EFFECT: invention provides preparing the ready storage-stable disinfection solutions containing active chlorine.

6 cl, 15 ex

FIELD: medicine.

SUBSTANCE: group of inventions relates to field of medicine, in particular, to ophthalmology. Group of inventions relate to antibacterial lenses, which contain metals, and methods of there production. Antibacterial lens which contains metal salt, obtained by method (versions), which includes stages: (a) processing hardened lens by solution, which contains metal-containing preparation and efficient quantity of acid substance, where pH of claimed solution constitutes from 2 to 5; and (b) processing of lens from (a) stage with solution, containing, basically containing or consisting of salt precursor and efficient quantity of acid substance, where pH of said solution constitutes from 2 to 5.

EFFECT: group of inventions ensures obtaining contact lenses, which contain antibacterial medications of constant composition.

19 cl, 2 dwg, 2 ex

FIELD: medicine.

SUBSTANCE: invention refers to veterinary science, namely to agents applied for disinfection. The disinfection composition contains hydrogen peroxide, potassium fluoride, diammonium phosphate, EDTA, sulphonol and a polar solvent (40% aqueous-alcohol mixture) in the following ingredient proportions (wt %): hydrogen peroxide - 4.0-5.0; potassium fluoride -10.0-15.0; diammonium phosphate - 0.3-1.0; EDTA - 0.5-2.0; sulphonol -0.3-1.0; the polar solvent - the rest.

EFFECT: invention provides disinfection of premises contaminated with bacteria, fungi, as well as viruses; it is non-toxic for higher animals and birds that enables to apply it in the presence of animals; it may be stored for a long period of time with no activity loss.

4 cl, 10 tbl, 4 ex

FIELD: medicine, virology, pharmacy.

SUBSTANCE: invention relates to using derivatives of dithiocarbamate of the formula: R1R2NCS2H and oxidized forms of these compounds, in particular, their dimmers and their pharmaceutically compatible salts for preparing an agent used in treatment or prophylaxis of infection caused by RNA-containing viruses that damage respiratory tract and inducing disease. Also, invention relates to a disinfecting agent containing dithiocarbamate compound and a method for disinfection of surfaces, media and cell cultures.

EFFECT: valuable medicinal properties of compounds.

19 cl, 14 dwg, 14 ex

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