Anti-corrosion detergent compositions and use thereof in cleaning dental and medical instruments

FIELD: chemistry.

SUBSTANCE: detergent composition has pH ranging from neutral to alkaline and contains an aqueous solution. The solution contains 0.005-10% surfactant with low foaming capacity; 0.005-10% corrosion inhibiting compound selected from C4-C16 alkylpyrrolidones and C1-C18 alkylamines and 0.01-15% modifying additive for preventing precipitation when metal ions react with the said surfactant. The cleaning solution contains a corrosion inhibitor and leaves a small amount of residue. The compositions are used not only at the washing stage of the cleaning cycle, but at one of the subsequent stages of the rinsing cycle in order to optimise cleaning and prevent rusting.

EFFECT: improved anti-corrosion and cleaning properties.

14 cl, 3 tbl

 

This invention relates in General to a method of cleaning dental and medical instruments. In particular, this invention in one aspect is directed to a new method of cleaning dental and surgical instruments to optimize as corrosion protection, and the efficiency of treatment.

According to another aspect of the present invention is directed to new anticorrosive composition, including detergents for medical and surgical instruments, which are particularly suitable for use in the cleaning process according to this invention.

Despite the fact that dental and medical instruments are made of stainless steel, they are prone to corrosion when the loop processing (washing, disinfection, sterilization). Dental instruments are usually more susceptible to corrosion due to the higher carbon content in them. To obtain the desired characteristics of the instruments, such as surface hardness and wear resistance, tool makers often resort to such methods of manufacture, as heat treatment, which is also undesirable effect, compromising the durability of tools to corrosion. To reduce the magnitude and rate of the corrosion process, or even to protect her, should predprinimatelyu steps for active protection against corrosion.

It is known that in some cases even prolonged contact with fresh water can initiate corrosion on the surface of the tool. Some detergents designed to clean medical instruments contain inhibitors rust. The action of these inhibitors is limited by the stage of the wash cycle clean; the only stage at which usually apply detergents. This usually eliminates all stages of rinsing and final stage of the cleaning cycle - air drying. To cover these stages often use different sets of chemicals. These chemicals are known as subsidiary means for the rinsing with inhibitors rust. These auxiliary means for rinsing have a dual purpose: (i) change the properties of water for rinsing, in order to facilitate the drying of the instruments, and (ii) improve the protective properties relative to rust. Products type of surgical jelly can also be used to protect the surface of the instruments from corrosion stage after rinsing.

Such processes create the need to use a large number of different chemicals during the washing cycle. The cost of individual chemicals, work with them and dosing systems chemical substances makes the process of cleaning Dor the shM and complex.

A typical cleaning cycle of medical instruments consists of several consecutive stages: pre-wash, wash, rinse (usually two) and drying. Preliminary washing is used to dissolve blood on the instruments, and carry it out with cold water to prevent blood clotting. Proper washing is carried out hot/warm water and detergent. Washing time, water temperature and detergent shall be chosen in accordance with the requirements. Several Laundry rinsing uses used to remove grease, dissolved at the stage of washing, and the remaining detergent.

A number of detergents, improved inhibitors rust, designed specifically for use in ultrasonic cleaning units, where the rinsing of instruments is not recommended to support the presence of detergent on the surface of the instruments. An example is Ultrasonic Solution (solution for ultrasonic treatment), made Health Sonic Corporation. Inhibitors rust remains on the surface of the instruments after the cleaning cycle is complete. This protection against rust is limited in time, action, and can evaporate from the surface or fade under normal high temperature sterilization process, so that the surface of the tool human who does not remains precipitation, when it is used on the patient.

Unfortunately, avoiding the stage of rinsing to get the maximum protective effect of these inhibitors, rust, we can compromise the purity of the tools. The main task of the stage of rinsing is to wash the dirt released and dissolved on stage wash, and remove it together with the used detergent.

The term "anti-corrosion detergent that does not require rinsing" will be used to denote detergent, improved inhibitors rust that remains on the surface of the tools after completing a cleaning cycle, where protection against rust is limited in time, action, and evaporates from the surface or burns due to high-temperature sterilization process so that virtually no rainfall does not remain on the surface of the tool when using it on the patient.

Applicants have found that a number of these do not require rinsing corrosion detergents you can actually use in the wash cycle, which includes stages of washing, rinsing and drying (as, for example, in spray washing installation with process control), for corrosion protection, and without compromising cleaning performance. This cleanser is used on the Tadei wash cleaning cycle, to clean and prevent corrosion (as happens when using ultrasonic cleaning installation), but it also add, at lower concentrations, at the subsequent stages of rinsing, especially at the last stage of rinsing. It supports a high level of protection from corrosion without failure from rinsing, which is important for proper treatment. This new method of cleaning instruments, in which at least the final rinse contains cleanser, eliminates the necessity of using large quantities of chemicals (cleaning agent, auxiliary agent for rinsing, "surgical jelly").

Applicants have also developed a family of specially composed songs corrosion detergents containing a surfactant with a low foaming ability and alkylpyridine or certain bonds alkylamines, allowing you to control corrosion during the cleaning/disinfection of medical instruments in automatic washing systems with programmable stage washing and rinsing.

As noted above, applicants have found that suitable detergents, improved inhibitors rust (mainly those for which protection against rust is limited in in the time the action and which evaporate from the surface or easily burn out during subsequent sterilization), can be used in spray washing machines controlled process, not only during the stage of washing, but also in one or more stages of rinsing to optimize as cleaning and corrosion protection. An example of such washing machines tools are washing machines for tools HYDRIM (trade mark)manufactured by SciCan.

Table 1 illustrates typical dosing detergent for pre-wash stages, wash and second rinse in cleaning cycles washing machine HYDRIM CS1W Instrument manufactured by SciCan. For this machine the total volume of water used in the cleaning cycle takes about 3 L. the Total amount of detergent dispensed during the stages of pre-wash, wash and second rinse, respectively, of 5.7 ml, 37 ml and 11,37 ml.

Table 1
Dosage of detergent (ml), Hydrim CS1W
CyclePre-washWash2nd rinse
Start the pre-washBeginning stage wash At 45CThe beginning of the 2nd rinse
P1 (norm.)the 5.718,518,511,37
P2 (reinforced.)the 5.718,518,511,37

The user can choose any of the two programs (cycles) of treatment. The program is denoted by P1 (normal), passes from the pre-wash before the second rinsing for about five minutes, while P2 (reinforced) - cycle runs about nine minutes. In each case, at the beginning of the pre-wash add a small concentration (for example, 30% of full size) composition corrosion detergent.

A higher level of cleaning composition (total concentration of detergent) is added to the beginning stages of washing and again when the degree of heating of the wash water reaches 45C, to provide detergent properties and protection against corrosion. The temperature range in which the machine runs HYDRIM is from room temperature to approximately 70C. This cleanser can also be used in washing machines/disinfector that reach is emperatur 93C.

The first rinse is conducted without any detergent. It is a short phase in which the detergent remaining on the phase of the wash, still protects the tool.

The second (and any subsequent) rinsing occurs at low concentrations of detergent (for example, 30% of full size). Here the detergent used for corrosion protection and as an aid when the rinse. Detergent changes the surface tension of the rinse water, to increase the degree of water removal (flush) with the surface. The chemicals from the detergent also protect instruments from corrosion in wet conditions and during the drying cycle. The remaining dry surface is visually clean and has no threat of precipitation. Fixed residues are below 2310-3mg/mm2the surface of the tool, a result that is comparable with the result obtained using any other auxiliary means for rinsing, which are used usually. The remains invisible and do not adversely impact on the appearance of the tool, its behavior, its useful life or service cycle.

In accordance with the method according to this invention can be used a large number of commercially available do not require rinsing corrosion of mine is their money we assume for use in ultrasonic cleaning installation. That is, they too can be added at stages following the stage of the wash cycle of treatment. However, the applicants have developed a specially developed clubparadise concentrate protects against corrosion cleaning solution containing a surfactant with a low foaming ability and alkylpyridine or alkylamine, which provides excellent properties for cleaning and corrosion protection.

It was unexpectedly discovered that the cleaning concentrate according to this invention and diluted solutions containing at least 0.005% of a surfactant with a low foaming ability and at least 0.005% of C4-C16 of alkylpyridine or C1-C18 of the alkylamine, exhibit excellent cleaning/protective against corrosion properties, especially when cleaning metal dental instruments. Some such tools often rust after washing and rinsing, but the compositions according to the present invention prevent the formation of rust and corrosion.

Concentrate cleaning solution according to this invention has a pH from neutral to alkaline, preferably from 7 to 12. According to the specification of component concentration in the aqueous cleaning compositions are installed in mass percent. Active ingredients SLA is openasia, protects against corrosion of the cleaning solution according to this invention are the following:

(a) about 0.005 to 10% of the composition is a surfactant with a low foaming ability, chosen from block copolymers of polyoxyethylene/polyoxypropylene, where the molecular weight of polyoxypropylene approximately from 1500 to 8500, and in which less than about 30% of the total molecular weight is due to polyoxypropylene;

(b) 0.005 to 10% of the composition comprises a compound selected from C4-C16 of alkylpyridine and C1-C18 alkylamines followed, as inhibiting the corrosion of the connection;

(c) from about 0.01 to 15% of the composition comprises at least one modifying agent selected from the group of phosphonic acids such as 1-hydroxyethylidene 1,1-diphosphonic acid, aminotri(methylene phosphonic acid), diethylenetriaminepenta(methylenephosphonate acid), 2-hydroxyethylimino-bis-(methylenephosphonate acid), ethylenediaminetetra (methylenephosphonate acid), EDTA (ethylenediaminetetraacetic acid), DTPA (diethylenetriaminepentaacetic acid), HEDTA (N-(hydroxyethyl)ethylenediaminetetraacetic acid), NTA (nitryltriacetic acid), 2-gidroksietilirovanny acid, sodium tripolyphosphate sodium or potassium, citric acid, phate, sodium, sodium hexametaphosphate and mixtures thereof, and

(d) from about 0% to 20% of the composition comprises at least one hydrotap, selected from the group comprising xylenesulfonate sodium, coolcullen sodium, C6-C18 alkylsulfonate acids and their salts, C6-C20 alkylpolyglucoside and C6-C16 diphenylacetylene.

The term "modifying agent" is usually used in the field of detergents to refer to molecules that can trap and remove from the water polyvalent cations such as calcium and magnesium. These cations tend to precipitate surfactant, forming unwanted dirt or residue.

"Gidrostroy" are compounds used to increase the solubility of surfactants in aqueous solutions. Their use is described in textbooks and the literature in this area, for example in the Book about surface-active substances and phenomena on the surface of partition" (Book of Surfactants and Interfacial Phenomena), the author Milton Rosen.

Although the surfactants used a large number of alkylpyridine, their effective role as corrosion inhibitors is a new and unexpected. We can assume that it follows from the ability of C4-C16 of alkylpyridine developing solution in zwitter-ions, with the ability to be absorbed into positively or negatively charged metal surfaces, thus ensuring uniform protection against corrosion./p>

As for the C1-C18 alkylamines followed, at neutral or slightly alkaline pH, these compounds are ionized to the Quaternary ammonium form, and this positive ion can be adsorbed on negatively charged surfaces of metal, again enhancing protection against corrosion.

The compositions of this invention may contain as a possible additional ingredients:

- at least one solvent in an amount of about 0.001 to 20% of the composition, selected from the group of glycols, ethers of glycols, C1-C6 linear or branched alcohols and aromatic alcohols;

at least one buffer to maintain pH in the amount of from about 0.001 to 10% of the composition, selected from boric acid, citric acid, phosphoric acid and their salts;

at least one additional surfactant in an amount of from 0.01 to 10% of the composition, selected from nonionic, anionic, amphoteric and cationic surfactants; and

at least one corrosion inhibitor in an amount of about from 0.001% to 10% of the composition, selected from the group of molybdates (e.g., sodium molybdate), nitrites (eg, sodium nitrite), triazoles (e.g., 1,2,3-benzotriazol), gluconate and carboxylic acids.

A set of tests on the washing ability was held on the rods of stainless steel, having a high (min 0,15%) with the content of carbon. This material was subjected to heat treatment to reduce corrosion resistance. The surface of these rods examined for the appearance of rust.

As usual, does not require rinsing corrosion detergents give more than 25% of the surface covered by rust/corrosion products, all proposed applicants compositions of Table 2 gave less than 5% cover by corrosion products; an example implementation of anti-corrosion detergent composition according to this invention, which is preferred at the present time, are shown in Table 3, no visibly detectable rust or corrosion products on the surface of the tested steel bars.

Specialists in this field should understand that can be carried out in various modifications of this method and compositions described above, within the essence and scope of this invention. Accordingly, it is assumed that here specific examples of implementation should be considered only as illustration, and the invention is limited only by the claims.

Triethanolamine13
Table 2
447244734474 4475460846734677467946804690
Source materialwt.%wt.%wt.%wt.%wt.%wt.%wt.%wt.%wt.%wt.%
Deionized water1up to 100%50,6045,6047,3058,3062,3033,24
Dequest 201028,008,008,008,008,008,0012,80
KOH (45%)311,5011,5011,5011,50 10,509,00Ls 16.80
Propylene glycol47,008,0012,0012,0010,009,5016,00
Ecological sodium58,40
Pluronic 17R260,050,500,700,500,500,80
Bioterge PAS-8S71,401,401,40
Cobratec 35 G83,50
Molybdate sodium91,501,501,501,50
Boric acid1022,002,002,000,200,200,20
Octylamine111000
Surfadone LP-1001202002,004,002,002,002,003,20
0050
SXS1414,5014,0014,0010,008,0016,00
Etox 2400151,000,500,500,96
TOTAL:100100100100100100100100100100

Notes to table 2:

1media

21-hydroxyethylidene, 1,1 diphosphonic acid (modifying agent)

3potassium hydroxide (to adjust pH)

4solvent

5hydrotap

6trademark of BASF for a copolymer of polyoxyethylene/polyoxypropylene (a substance suppressing the formation of foam)

7brand Stepan for octisalate (anionic surfactant)

81,2,3-benzotriazol (anti-corrosion agent for copper)

9corrosion inhibitor

10non-toxic buffer to maintain pH

11corrosion inhibitor

12brand ISP for M-octyl-2-pyrrolidone (inhibitor cor is Uzziah)

13corrosion inhibitor and an agent for regulating the pH

14trademark Stepan for cellsurface sodium (hydrotap)

15brand Etox for ethylenoxide/propyleneoxide copolymer (nonionic surfactant)

Table 3
Source materialChemical nameSource/supplierwt.%
Deionized waterMedia50,14
Dequest 2010 (60%)1-hydroxyethylidene 1,1-diphosphonic acidSolutia10,50
Propylene glycolSolvent5,00
Boric acidBuffer to maintain pHBorax0,20
SXS (40%)Ecological sodium (hydrotap)Stepan 16,00
KOH (45%)Potassium hydroxide (pH regulator)12,80
Ethox 2400Ethoxylated alcohol (nonionic surfactant)Ethox Co.0,96
SurfidoneLP 100N-octyl-2-pyrrolidone (cationic surfactant)ISP corporation3,20
Dehypon LS-36Alcohol C12-C14 EA/(nonionic surfactant)Cognis0,60
Dehypon LS 54Alcohol C12-C14 EA/(non-ionic surfactant - suppressor foam)Cognis0,60
TOTAL:100

1. Anti-corrosive cleaning composition for use in cleaning dental and medical instruments, comprising in aqueous solution:
(a) 0.005 to 10% surfactant with a low foaming capacity;
(b) 0.005 to 10% corrosion inhibition, compounds selected from C4-C16 of alkylpyridine and C1-C18 Alky the amines;
(c) from 0.01 to 15% of the modifying additive to prevent sludge formation in the reaction of metal ions in aqueous solution with a specified surface-active substance and
(d) from 0 to 20% of hydrotropes,
where the pH of the specified anti-corrosive cleaning composition is in the range from neutral to alkaline.

2. Corrosion washing composition according to claim 1, having a pH of from 7 to 12.

3. Corrosion washing composition according to claim 1 or 2, in which the specified surfactant with a low foaming ability selected from the group consisting of block copolymers of polyoxyethylene/polyoxypropylene, where the molecular weight of polyoxypropylene approximately from 1500 to 8500, and in which less than about 30%of t total molecular weight due to polyoxypropylene.

4. Corrosion washing composition according to claim 2, in which the modifying agent selected from the group consisting of 1-hydroxyethylidene 1,1-diphosphonic acid, amino tri-(methylene phosphonic acid), diethylenetriaminepenta (methylenephosphonic acid), 2-hydroxyethylimino-bis (methylenephosphonic acid), ethylenediaminetetra(methylenephosphonic acid), EDTA (ethylenediaminetetraacetic acid), DTPA (diethylenetriaminepentaacetic acid), HEDTA (N-(hydroxyethyl)-ethylenediaminetriacetic acid), NTA (nitryltriacetic acid), 2-HYDR is citrinopileatus acid, of sodium tripolyphosphate or potassium, citric acid, glycolic acid, phate, sodium, sodium hexametaphosphate and mixtures thereof.

5. Corrosion washing composition according to claim 2, in which the specified hydrotap selected from the group consisting of cellsurface sodium, kamalalawalu sodium, C6-C18 alkylsulfonic acids and their salts, C6-C20 of alkylpolyglycoside and C6-C16 diphenyloxide of disulfonates.

6. Anti-corrosive cleaning composition for use in cleaning dental and medical instruments, comprising in aqueous solution:
(a) 0.005 to 10% surfactant with a low foaming ability, selected from the group consisting of block copolymers of polyoxyethylene/polyoxypropylene, where the molecular weight of polyoxypropylene approximately from 1500 to 8500, and in which less than about 30% of the total molecular weight is due to polyoxypropylene;
(b) 0.005 to 10% corrosion inhibition, compounds selected from C4-C16 of alkylpyridine or C1-C18 alkylamines followed;
(c) modifying additives to prevent the formation of precipitates at the reaction of the metal in aqueous solution with a surface-active substance selected from the group consisting of 1-hydroxyethylidene 1,1-diphosphonic acid, amino-three(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), 2-hydro is sidilemine-bis(methylenephosphonic acid), ethylenediaminetetra(methylenephosphonic acid), EDTA (ethylenediaminetetraacetic acid), DTPA (diethylenetriaminepentaacetic acid), HEDTA (N-(hydroxyethyl)-ethylenediaminetriacetic acid), NTA (nitryltriacetic acid), 2-hydroxyethylaminomethyl acid, sodium tripolyphosphate or potassium, citric acid, phate, sodium, sodium hexametaphosphate and mixtures thereof;
(d) from 0 to 20% of hydrotropes selected from the group consisting of cellsurface sodium, kamalalawalu sodium, C6-C18 alkylsulfonic acids and their salts, C6-C20 of alkylpolyglycoside and C6-C16 diphenyloxide of disulfonates, where the pH of this aqueous solution is from 7 to 12.

7. Corrosion washing composition according to claim 6, further comprising from 0.001% to 20% of a solvent selected from the group consisting of glycols, ethers of glycols, C1-C6 linear or branched alcohols and aromatic alcohols.

8. Corrosion washing composition according to claim 6, further comprising from 0.001 to 10% buffer selected from the group consisting of boric acid, citric acid, phosphoric acid and their salts.

9. Corrosion washing composition according to claim 6, comprising from 0.01 to 10% additional surfactants selected from nonionic, anionic, cationic or amphoteric surface-active substances.

10. Corrosion washing the song according to claim 6, comprising from 0.01 to 10% additional anti-corrosion compounds selected from the group consisting of molybdates, alkali metal nitrites, alkali metal, triazoles, gluconate and carboxylic acids.

11. The method of cleaning metallic medical and dental instruments to remove them from dirt and corrosion inhibition, including:
(a) at the stage of washing washing instruments in an aqueous solution containing anti-corrosive cleaning composition according to any one of claims 1 to 5, with the subsequent flow of fluid from tools;
(b) carrying out at least one stage of rinsing with the subsequent flow of liquid, use water liquid for rinsing, with specified water rinsing fluid includes a predetermined concentration of the specified detergent at least at the final stage of rinsing.

12. The method according to claim 11, including preliminary washing using an aqueous solution containing a lower concentration of the specified detergent than it is at this stage of washing.

13. The method of cleaning metallic medical and dental instruments to remove them from dirt and corrosion inhibition, including:
(a) at the stage of washing washing instruments in an aqueous solution containing anti-corrosive detergent to the position on any of PP-10, with the subsequent flow of fluid from tools;
(b) carrying out at least one stage of rinsing with the subsequent flow of liquid, use water liquid for rinsing, with specified water rinsing fluid includes a predetermined concentration of the specified detergent at least at the final stage of rinsing.

14. The method according to item 13, including preliminary washing using an aqueous solution containing a lower concentration of the specified detergent than it is at this stage wash.



 

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