RussianPatents.com

Method of waterproofing plaster

Method of waterproofing plaster
IPC classes for russian patent Method of waterproofing plaster (RU 2199500):
Another patents in same IPC classes:
Insulation material Insulation material / 2102350
The invention relates to thermal insulation materials that can be used for thermal insulation of surfaces in various sectors of the national economy
Composition for a protective and decorative coating of building products Composition for a protective and decorative coating of building products / 2093488
The invention relates to the field of building materials and is intended for use as coatings for protective and decorative finishes building products of concrete, asbestos cement, cement-bonded particleboards
A method of manufacturing a layered product on the basis of silicate glass A method of manufacturing a layered product on the basis of silicate glass / 2084415
The invention relates to the method of manufacturing the layered product of the silicate glass, in particular, silicate triplexes, intended for glazing of vehicles and other purposes
Polymer mixture for floors Polymer mixture for floors / 2076848
The invention relates to polymer mixtures for the device chemical resistant and impervious tile floors in industrial, civil and agricultural buildings
Composition for coating Composition for coating / 2067086
The invention relates to the construction materials industry, in particular, compositions of coatings for building structures
A method of manufacturing a construction finishes A method of manufacturing a construction finishes / 2055032
The invention relates to the construction, in particular for decorating
Raw mix for the production of wood-concrete materials and method of reception Raw mix for the production of wood-concrete materials and method of reception / 2194685
The invention relates to the field of construction and can be used in the manufacture of building materials for the construction of industrial and residential objects
A method of manufacturing a wood-mineral plates A method of manufacturing a wood-mineral plates / 2191761
The invention relates to the field of construction and can be used in the technology of wood-mineral plates
Raw mix for wood-mineral building materials Raw mix for wood-mineral building materials / 2191756
The invention relates to the construction materials industry, in particular to raw mixtures with wood filler, and can be used for construction of houses, commercial buildings, etc
Concrete mix / 2188803
The invention relates to the construction, in particular to the field of concrete structures
Raw mix for the production of gypsum concrete Raw mix for the production of gypsum concrete / 2188176
The invention relates to building materials and can be used in the manufacture of lightweight gypsum blocks and structures
Concrete mix Concrete mix / 2188175
The invention relates to the production of concrete products, decorative plates, road and pavement coatings
The complex additive for concrete and mortars The complex additive for concrete and mortars / 2187480
The invention relates to additive compositions for concrete mix, in particular additives that promote the production of concrete works at negative ambient temperatures, in particular for conservation in mixtures of liquid phase necessary for the hydration and hardening of cement paste during execution of works at temperatures from -1 to -55oWith
A method of manufacturing a single-piece construction products A method of manufacturing a single-piece construction products / 2186750
The invention relates to the construction materials industry and can be used in the manufacture of wood-cement products

(57) Abstract:

Describes a method of waterproofing plaster, namely, that to the powder plaster add at least one component (A) containing at least one alkylhydroperoxide at least one hydrocolloid (C) containing at least one galactomannan, and at least one polysaccharide (S) containing at least one gum, powdered composition containing at least one hydrocolloid In an amount of 0.05-0.5%, the solid is based on at least one supported on a carrier component (A) in an amount not greater than 0.25% by weight of the plaster, and at least one polysaccharide (S) in an amount of 0.01-0.5%, a molded product in the form of sheets or plates, obtained from gidrofobizirovannogo plaster, and a product for waterproofing containing components a, b, C. 5 C. and 22 C.p. f-crystals, 3 tables.

The present invention relates to a method of waterproofing plaster and plaster products.

Plaster, with the chemical formula CaSO41/2H2Oh, is formed by calcination of natural or synthetic gypsum at a temperature of approximately 140oC.

When is="ptx2">

If the annealing is performed at a pressure above atmospheric, receive plaster type .

The calcination of gypsum (CaSO42H2O) at temperatures above 600oWith network anhydrite (CaSO4). There are also synthetic anhydrite, such as florangela. It should be noted that the anhydrite (CaSO4) can also be of natural origin, for example in the form of rock.

The calcium sulfate in palpitations or anhydrous form (plaster , and synthetic or natural anhydrite) when mixed with water, or damping, can form gypsum formula CaSO42H2O. Gypsum is water-sensitive substance having a solubility of approximately 2.0 g/l at 20oC.

In the framework of the present invention, the term "plaster" means all of the above forms, which after rehydration give gypsum (CaSO42H2O).

In various cases, plaster application to have the material having stable mechanical properties. It is also significant that the solidified material is maintained after contact with the humidity of their original properties (shape, color, etc). For this purpose, the plaster should be gidrofobizirovan, i.e. sdelete need to handle the plaster on the surface and in the bulk. In the case of waterproofing in the mass processing of produce in situ during the manufacturing process covered by plaster products, usually by adding to the water shuts gidrofobizatsija connection.

Use only alkylhydroperoxides for waterproofing plaster in the mass is already known. After hydrolysis of alkylhydroperoxides usually leads to the formation of hydrophobic alkylhydroperoxides nets.

The main disadvantage of alkylhydroperoxides when they are used as water-repellent agent is that under certain operating conditions, namely at elevated temperatures (ranging approximately from 120oC), these compounds may be partially transformed into silica dust, which, due to its poroshkoobraznoe may create an obstacle to work means of transportation. This leads to a shutdown of the installation, causing thereby the expense of the production process.

On the other hand, depending on the pH of the plaster, when used as a repellent of alkylhydroperoxides may be more or less strong hydrogen gas, which creates problems of safety and quality promotornogo use containing plasters.

Finally, you may encounter performance problems of waterproofing for individual use alkylhydroperoxides with some types of plaster, in particular with plaster synthetic origin.

The main purpose of the present invention is to overcome the above disadvantages by applying the improved method of waterproofing plaster using a reduced number of alkylhydroperoxides that would allow to receive and retain a material whose sensitivity to the penetration of water would be significantly reduced and for a long time.

These goals are achieved in the present invention, which is the process of waterproofing plaster using alkylhydroperoxide (A), hydrocolloid () and polysaccharide containing at least one gum.

Under the process of "hydrophobicity plaster" refers to a process which makes plaster impervious to penetration of liquid water in the direction from the surface inward and in the direction from the inside to the surface of the plaster, while maintaining the permeability of the plaster to the water vapor in both directions.

The method of the present invention makes it also possible to easily reuse the treated plaster.

Under certain conditions, you can also receive the above gidrofobizirovannogo plaster with unchanged or even improved mechanical properties.

Furthermore, the method of the present invention can give good hydrophobic properties even plasters synthetic origin.

More specifically, the method of the invention is mixed with powder of plaster at least one component (A) containing at least one alkylhydroperoxide at least one hydrocolloid (C) containing at least one galactomannan at least one polysaccharide (S) containing at least one gum, and water.

The first essential component used in the method of the invention is the component (A) consisting of at least one alkylhydroperoxide. the ski or a mixture of linear and cyclic compounds, which describes the General formulas I and II:
< / BR>
< / BR>
in which: a and b are integers or fractional numbers, defined as:
- A, mainly a,
- 0b500, mainly 1b100,
- 5a+b1000, mainly 10a+b150,
- C and d are integers or fractional numbers, defined as:
- S, mainly s,
- 1d10, mainly 1d5,
- 3C+d10, mostly 3C+d5,
- R1identical or different, represent monovalent hydrocarbon radical with 1-8 carbon atoms, chosen from:
- normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl;
- unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical;
when b>0, R2identical or different, denote a hydrogen atom and/or a monovalent hydrocarbon radical with 1-8 carbon atoms, chosen from:
- normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl;
- unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical;
when b=0, menesheva or different, denote monovalent hydrocarbon radical with 1-8 carbon atoms, chosen from:
- normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl;
- unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical.

Component (A) consists mainly of at least one linear alkylhydroperoxide General formula I, in which:
the radicals R1and R2indicate a normal alkyl radicals containing 1-3 carbon atoms selected from the radicals methyl, ethyl and propyl, preferably methyl;
a and b are integers or fractional numbers, defined as:
- A, mainly a,
- 1b100, mainly 10b80,
- 10a+b150, mainly 20a+b100.

The above component (A) consists of at least one alkylhydroperoxide, which can have a viscosity of not more than 200 mPas, and preferably from 5 to 50 mPas.

Viscosity was determined using a BROOKFIELD viscometer at 25oC and 20 rpm

An important parameter for determining alkylhydroperoxides (A) of the invention is interest stradausim percentage of links SiH from 0.05 to 5, and preferably, from 0.3 to 2% by weight of hydrogen relative to the weight of component (A).

Usually alkylhydroperoxide used in the form of oil.

Alkylhydroperoxide (A) can be used in pure form, diluted in an organic solvent, emulsion or in the form of powder in the case, when they are fixed on the powdery carrier.

Alkylhydroperoxide (A) is used mainly in pure form, in the form of an aqueous emulsion or emulsified concentrates in the presence of suitable surface-active substances.

Usually alkylhydroperoxide present in amount of at least 0.3 percent by weight of powder of plaster that provides hydrophobic properties required by the regulations in respect of waterproofing:
water absorption <5% after 2 h immersion in water,
water absorption <10% after 24 h immersion in water.

The present invention allows to reduce the usual dose of alkylhydroperoxide (A) to the amount not exceeding 0.25% and, preferably, not exceeding about 0.15% by weight of powder of plaster, satisfied the above provisions.

The second essential component used in the method yomangani are polysaccharides, consisting of the sequence of monomers of type mannose and galactose. Of the galactomannans are mainly choose guar gum.

Guar gum is a natural hydrocolloid, otlichayushiesya as reserve material in the endosperm of guar beans. At the same time it is galactomannans, which molecule has a very specific configuration. The skeleton of the molecule consists of a long chain of links mannose, interconnected 1,4--glycosidic bond. Statistically one molecule mannose of the two has as branching galactose, connected via communication 1,6-.

Natural guar gum can be subjected to chemical modification, which allows to significantly change its properties, while maintaining its basic characteristics.

In particular, the free hydroxyl groups of the guar resin can be overridden by using the esterification reaction or esterification, resulting in the formation, for example, carboxyaniline, hydroxyethylamine and phosphate derivatives. The esterification reaction and esterification in themselves known, in particular in the chemistry of cellulose and starch.

You can also replace swobo of the present invention, hydrocolloid (In) mainly chosen from nonionic of galactomannans, in which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups. More specifically, the hydrocolloid (C) is a nonionic guar gum, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups in which the alkyl group contains from 2 to 4 carbon atoms. These are the non-ionic guar, also called simple hydroxyalkylated esters guarav, can be selected from gidroxiatilkrahmal, hydroxypropylamino and hydroxybutyrate.

(C) is mainly hydroxypropylamino.

Simple hydroxyalkyl ethers of guar present invention can be obtained by known methods, for example using the method described in canadian patent 1075727, in particular by reaction of the guar resin with acceleratedly, such as ethylene oxide, propylene oxide or butyleneglycol, in the presence of a catalyst, such as hydroxides of alkali metals, such as NaOH, hydroxides of alkaline earth metals or ammonium hydroxide.

The reaction may proceed at a temperature of from 15 to 130oC.

Typically, each monomer mannose (and/or Geidam. Thus, the degree of molar substitution simple hydroxyalkyl ether polymer as a whole and simple hydroxyalkyl ether of guar in particular can be defined as the number of moles of accelerated attached to hexazinone the link in the polymer and guar in particular.

The degree of molar substitution of hydrocolloid (b) and, in particular, simple hydroxyalkyl ether of guar of the present invention may range from 0.2 to 0.9 and, mainly, from 0.3 to 0.7.

Srednevekovaja molecular weight (Mw) of hydrocolloid In can vary from 50,000 to 2000000, mostly from 200000 to 1500000.

Srednevekovaja molecular weight (Mw) is expressed by the following formula:
< / BR>
where:
Nidenotes the number of moles of polymer type i,
Midenotes the molecular weight of the polymer of type i.

Hydrocolloid (In) usually exists in solid form. His introduction to this environment allows you to change the viscosity and rheological properties of this medium, depending on the desired specific requirements.

So, for dispersion 1% hydrocolloid In this environment, particularly in water, it is advantageous to have a viscosity of not more than 1500 mPas. The preferred viscosity is from 500 to who respectfully from 0.05 to 0.3, and even more preferably, from 0.10 to 0.25% by weight of powder of plaster.

From commercially available commercial products hydrocolloid () can be called as not limiting the invention to the examples, in particular, products of the company RHODIA: RHOXIMAT RH 148, JAGUAR 140 HP, JAGUAR 8000, JAGUAR 8200, JAGUAR 8801 and JAGUAR HP 8.

The third essential component used in the method of the invention is a polysaccharide (S) containing at least one gum.

Polysaccharides can include all natural and modified gums.

Natural gums contain seaweed extracts such as agar, Algin, carragenan, exudates of plants, such as gum Arabic, resin karaya, tragacanth resin, resin Gatti; gums derived from grains, such as guar gum, resin carob, tar tar, resin tamarind; pectins; and gum produced by fermentation, such as xanthan gum.

Natural gum is mainly the guar resin.

Modified gums mainly receive chemical modification of the above-mentioned natural gums. Under chemical modification, more specifically, to understand the reaction of the type hydroxyethylamine and carboxyethylidene.

Under the depolymerization implied gap polymers, allowing to obtain polymers with lower molecular masses.

Depolimerizovannogo polysaccharide can be characterized by its degree of polymerization (SP). The degree of polymerization is usually calculated by dividing the molecular weight depolimerizovannogo polysaccharide 162, 162 where - equivalent molecular weight neutral hexose, which is a neutral monomer of this polysaccharide.

In the framework of the present invention, the polysaccharide (S) may have a degree of polymerization of from 60 to 50,000, mostly from 150 to 6500 and, preferably, from 100 to 500.

The depolymerization can be carried out:
- oxidation in the presence of alkali,
- by the action of bases in the presence of air,
- by enzymatic or
acid depolymerization.

These methods of depolymerization themselves known. You can, for example, refer to:
- EP 0130946 that relates to a method of oxidative depolymerization in the presence of alkali and alkaline depolymerization in the presence of air;

The content of these works, of course, included in the present application.

Polysaccharides (C) predominantly derived from natural gums oxidative depolymerization in the presence of alkali or alkaline depolymerization in the presence of air.

The average molecular weight (Mw) of the polysaccharide (S) may vary from 10,000 to 8000000, mostly from 30,000 to 1,000,000 and preferably from 20000 to 70000.

As hydrocolloid (), polysaccharide (S) is usually a solid.

The introduction of the polysaccharide (S) in this environment allows you to change the viscosity and rheological properties of this medium, depending on the desired specific requirements.

So, for a 10% dispersion of the polysaccharide (S) in the environment, particularly in water, it is advisable to have a viscosity of not more than 2500 mPas. More specifically, the viscosity is in the range from 500 to 1500 mPas.

The content of the polysaccharide (S) is from 0.01 to 0.5, mainly from 0.05 to 0.5 and preferably from 0.1 to 0.30% by weight of powder of plaster.

Commercial products of polysaccharides (C) can be as not the EYPROGAT 30, MEYPROGAT 90 and MEYPRODOR 100 company RHODIA and FIBERON.

Hydrophobicity plaster can be carried out using known methods, for example by mixing the powder of plaster, component (A) containing at least one alkylhydroperoxide, hydrocolloid (C) containing at least one galactomannan, polysaccharide (S) containing at least one gum, and water.

May, for example, be the following sequence of operations:
i) pre-mix component (A), hydrocolloid (In) and the polysaccharide (S) in shuts the water,
ii) to enter into a pre-prepared mixture of plaster,
iii) to give the plaster form, wait for the stiffening material and
iv) dry the plaster in a drying Cabinet to constant weight.

Shuts the water may contain other additives (which can be entered and fresh pasta), in particular agents, thinning and dispersing plaster, and/or foaming agents.

As vasospasm or dispersing agent can be called condensed phosphates, sodium tripolyphosphate, sodium hexametaphosphate, metrpole(meth)acrylates, atilola(meth)acrylate or sodium salt of poly(meth)AE as methylenephosphonate, polysulphonate, such as lignosulfonates, petroleum sulfonates, polystyrene sulfonates, sulfonated polycondensate, such as sulfonated naphthalene-formaldehyde polycondensate, primality in acid form and/or as a salt of an alkali metal, tannins, lignins, glucosides, gluconate, alginates, esters of phosphoric acid and phospho-glass. These and other compounds described in the book "Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd edition, T. 7, pages 833-846", which is a part of the present description.

As foaming agents can be called the group of surface-active substances such as sodium or ammonium salts of alkyl sulphates, sodium or ammonium salt of laurylsulfate, cocoamphodiacetate-diallylmalonate sodium, ethoxylated alcohols, ethoxylated fatty alcohols, sucrose glycerides, ethoxylated castor or copra oil and betaines. In particular, can be used a commercial wetting agents, for example supplied by the company RHODIA RHIDASURF 860 R, RHOCAFOAM'AN 45, RHOCAFOAM 10 AMP, RHOCAFOAM AB 20, RHOXIMAT TG 80 and RHOCAFOAM'AN 30.

As already mentioned, the hydrocolloid () is usually a solid. Component (A) may be in the form of pure oil, would the ATA. The latter means that the component (A) after adding thereto a surfactant becomes the immediate formation of emulsions in case you enter into contact with water.

In this case, the subject of the invention is a method of waterproofing plaster, characterized in that the add plaster composition containing:
at least one hydrocolloid (C) containing at least one defined above galactomannan in the solid state,
- at least one polysaccharide (S) containing at least one defined above the gum, and
at least one component (A) containing at least one above-defined alkylhydroperoxide in the form of pure oil, diluted in solution, in emulsion or in the form capable of emulgirovanija concentrate.

In the case when the components (A), (b) and (C) are solid, pre-cooked mixture is a powder composition.

As the components (b) and (C) are usually found in the solid state, there is a problem with the component (A).

As mentioned, the component (A) is typically oil. It gives a solid form, usually by impregnation and the IASA or any other inert mineral or organic filler.

The impregnation is carried out in a known manner by entering the solid carrier in contact with a pure component (A) or with a solution or emulsion containing the component (A).

This operation is usually carried out, maintaining a solid carrier in a certain amount of the component (A) or a certain volume of a solution or emulsion containing the component (A). You can also be impregnated solid carrier, immersing it in a clean component (A) or a solution or emulsion containing the component (A), with the subsequent removal of excess solution method scapania.

Drawing on the carrier can also be produced directly by spraying pure component (A) or a solution or emulsion containing the component (a), And the mixer, for example of the type Lodige or Forberg.

Thus, the subject invention is a powdery composition containing:
at least one hydrocolloid (C) containing at least one defined above galactomannan,
- at least one polysaccharide (S) containing at least one defined above the gum, and
at least one component (A) containing at least one above-defined alkylhydroperoxide.

Italokat of plaster, subject hydrophobization processing, which is described in the present description.

Finally, the subject of the invention is a product containing at least one component (A) containing at least one alkylhydroperoxide corresponding to General formulas (I) and (II) at least one of the above hydrocolloid (C) containing at least one galactomannan, and at least one polysaccharide (S) containing at least one gum, as a combined product for sharing in the process of waterproofing plaster.

Sharing means using three components (A), (b) and (C) together to obtain the desired water-repellent action, and components (A), (B) and (C) may be introduced into the plaster at the same time or separately.

Listed below are the specific, but not limiting of the scope of the invention examples.

Examples
Example 1
Equipment
The following equipment is the same for all examples. It includes:
- mixer Raineri and a four-bladed propeller used at a speed of 1200 rpm;
form stainless steel for samples of size 4416 with the x2">

Materials
Prepared four series of three specimens of plaster of 3600 g of natural plaster (CaSO41/2H2O).

Series 1 - control plaster (without water-repellent).

Series 2 - plaster, to which was added 0.3 percent by weight of powder of plaster of polymethylhydrosiloxane blocked at the end of the chain methyl groups having the formula (CH3)3Si-O-[SiH(CH3)-O]x-Si(CH3)3where h, and called RHOXIMAT N 68, in the form of pure oil.

Series 3 - plaster, to which was added 0.1% of the mass of powder plaster RHOXIMAT H 68 in the form of pure oil.

Series 4 corresponds to the plaster, to which was added 0.1% of the mass of powder plaster RHOXIMAT N 68, of 0.15% by weight of powder of plaster Guara RHOXIMAT RH 148 representing hydroxypropanoic with a molecular mass of approximately 1200000 and a molar degree of substitution of approximately 0.6 and 0.15% by weight of powder of plaster MEYPROGAT 7, which is depolimerizovannogo guar with a molecular mass of approximately 47,000 and the degree of depolymerization of approximately 300.

For all samples the quantity of water added is such that the ratio of water to plaster remains always equal to 0.75.

- Add for 15 with plaster and mix for 15 sec. to Withstand 30 and again stirred for 30 sec.

- Pour the plaster into the form, to condense, to level the surface and leave to set (duration about 30 minutes).

After completion of the setting to retrieve samples of the plaster from the mold and dried for 40 hours at 40oWith in a ventilated drying Cabinet.

Evaluation of the hydrophobic properties of samples
After removal from the drying chamber the samples provide an opportunity to spontaneously cooled to 23oC at a relative humidity of 65%.

The samples are immersed in drinking water to a depth of approximately 1 cm and produce weighing each h for 8 h and then after 24 hours

Expression of results
The amount of absorbed water is expressed as % of dry mass of the sample at time t according to the following formula:
< / BR>
E1the mass of the sample at time t=0;
E2the mass of the sample at time t.

Each product is tested on a series of 3 samples of plaster.

The results are shown in table. I, correspond to the average of the 3 tests is their hydrophobic properties of plaster, to which is added a reduced number RHOXIMAT N 68, Guara RHOXIMAT RH 148 and MEYPROGAT 7.

Example 2
Test extension
Test expansion is performed on the plaster obtained by quenching 300 g dry mixed with 150 g of water in the mixer Raineri using the following sequence of operations:
to fall asleep within 30 to 500-ml vessel with water to the dry mixture, containing:
- 99.6% plaster;
0.1% of citric acid;
to 0.3% of the mixture RHOXIMAT RH 148 and MEYPROGAT 7;
- stir with a speed of 250 rpm;
within 15 to increase the mixing speed to 1000 rpm;
continue stirring speed of 1000 rpm for 75 C.

Citric acid is a moderated setting plaster.

While the mixture RHOXIMAT RH 148 and MEYPROGAT 7 is 0.3% of the total mass, the content of each component may vary.

Measuring the expansion of the mass is, for example, using a shaking table type EUROMATEST when using cylindrical shape with a diameter of 7.5 mm and a height of 50 mm

Form fill weight and measure of the expansion, i.e., the diameter of the original pellet after 5, 10 and 15 shaking. The interval between successive TSA is m and refer to the diameter of the mass at different stages.

From table. II it follows that the fluidity of fresh matter, characterized by the values of the expansion, only a small degree depends on the presence of MEYPROGAT 7 and RHOXIMAT RH 148 that allows you to mould the mass in the usual way.

Combining two products MEYPROGAT 7 and RHOXIMAT RH 148 allows you to obtain the best compromise between fluidity and preservation of the shape.

Example 3
Equipment
In this example, the equipment, as well as the sequence of operations are the same as in example 1.

Materials
Prepared four series of three specimens of plaster of 3600 g of natural plaster (CaSO41/2H2O).

Series 1 - control plaster (without water-repellent).

Series 2 - plaster, to which was added 0.5 percent by weight of plaster powder 60% emulsion of polymethylhydrosiloxane blocked at the end of the chain methyl groups having the formula (CH3)3Si-O-[SiH(CH3)-OH] x-Si(CH3)3where h and called RHOXIMAT HD 879.

Series 3 - plaster, which added to 0.17% by weight of powder of plaster 60% emulsion RHOXIMAT HD 879.

Series 4 corresponds to the plaster, which added to 0.17% by weight of powder of plaster 60% e is th hydroxypropanoic with a molecular mass of approximately 1200000 and a molar degree of substitution of approximately 0.6 and 0.15% by weight of powder of plaster MEYPROGAT 7, representing depolimerizovannogo guar with a molecular mass of approximately 47,000 and the degree of depolymerization of approximately 300.

Regardless of the sample, the quantity of water added is such that the ratio of water to plaster remains always equal to 0.75.

Evaluation of the hydrophobic properties of samples
After removal from the drying chamber the samples provide an opportunity to spontaneously cooled to 23oC at a relative humidity of 65%.

The samples are immersed in drinking water to a depth of approximately 1 cm and produce weighing each h for 8 h and then after 24 hours

Each product is tested on a series of 3 samples of plaster.

The results are shown in table. III, correspond to the average of the 3 trials and are given with a precision of 2 abs.%
Reliably established stable (for at least 24 hours) improvement of hydrophobic properties of plaster, to which is added a combination of two products MEYPROGAT 7+RHOXIMAT RH 148.

1. Method of waterproofing plaster, characterized in that the powder plaster add at least one component (A) containing at least one alkylhydroperoxide at least one hydro is Way under item 1, characterized in that plaster powder is mixed with at least one component (A) containing at least one alkylhydroperoxide at least one hydrocolloid (C) containing at least one galactomannan at least one polysaccharide (S) and water.

3. The method according to p. 1 or 2, characterized in that the component (A) consists of at least one linear and/or cyclic alkylhydroperoxide described by the General formulas I and II:
< / BR>
< / BR>
in which a and b are integers or fractional numbers, defined as:
A, mainly a, 0b500, mainly 1b100, 5A+b1000, mainly 10A+b150;
c and d are integers or fractional numbers, defined as: s, mainly s, 1d10, mainly 1d5, 3C+d10, mostly 3c+d5;
R1identical or different, represent monovalent hydrocarbon radical with 1-8 carbon atoms, selected from normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical;
when b>0, R2the same or different, marked branched alkyl radicals, in particular, the radicals methyl, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical;
when b=0, at least one of the radicals R2is a hydrogen atom, while the remaining radicals R2identical or different, represent monovalent hydrocarbon radical with 1-8 carbon atoms, selected from normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical.

4. The method according to any of paragraphs. 1-3, characterized in that the component (A) consists of at least one linear alkylhydroperoxide General formula I in which the radicals R1and R2indicate a normal alkyl radicals containing 1-3 carbon atoms, selected from the radicals methyl, ethyl and propyl, of which preference is given to stands; a and b are integers or fractional numbers, defined as: a, mainly a, 1b100, mainly 10b80, 10A+b150, mainly 20A+b100. 5. The method according to any of paragraphs.1-4, characterized in that to preferably 5 - 50 mPas.

6. The method according to any of paragraphs.1-5, characterized in that alkylhydroperoxide (a) the percentage of links SiH 0.05 to 5, preferably 0.3 to 2% by weight of hydrogen relative to the weight of component (A).

7. The method according to any of paragraphs.1-6, characterized in that the component (A) consists of at least one alkylhydroperoxide in the form of butter.

8. The method according to any of paragraphs.1-7, characterized in that the quantity of the component (A) does not exceed 0,25%, preferably not greater than 0.15% by weight of powder of plaster.

9. The method according to any of paragraphs.1-8, characterized in that the hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups substituted hydroxyalkyl groups in which the alkyl contains 2 to 4 carbon atoms.

10. The method according to p. 9, characterized in that the hydrocolloid (C) selected from gidroxiatilkrahmal, hydroxypropylamino and hydroxybutyrate.

11. The method according to p. 9 or 10, characterized in that the molar degree of substitution of hydrocolloids (b) is at least 0.2 to a maximum of 0.9, mainly 0,3 - 0,7.

12. The method according to any of paragraphs.1-11, characterized in that the molecular weight of hydrocolloid () ismene the hydrocolloid (C) in the form of a 1% dispersion in water has a viscosity of not more than 1500 mPas, mostly 500 - 1100 mPas.

14. The method according to any of paragraphs.1-13, characterized in that the content of hydrocolloid (C) is 0.05 to 0.5, preferably 0.05 to 0.3, and even more preferably 0.10 to 0.25% by mass of powder of plaster.

15. The method according to any of paragraphs.1-14, characterized in that the hydrocolloid (C) is a solid.

16. The method according to any of paragraphs.1-15, characterized in that the polysaccharide (S) consists of at least one gum selected from natural gums.

17. The method according to p. 16, wherein the gum is subjected to at least partial depolymerization.

18. The method according to p. 17, wherein the gum is subjected to oxidative depolymerization in the presence of alkali or alkaline depolymerization in the presence of air.

19. The method according to p. 18, characterized in that the polysaccharide (S) has a degree of polymerization of 60 to 50,000, mostly 150 - 6500 and preferably 100 to 500.

20. The method according to any of paragraphs.1-19, characterized in that the molecular weight of the polysaccharide (S) varies from 10,000 to 8000000, mostly from 30,000 to 1,000,000 and preferably from 20000 to 70000.

21. The method according to any of paragraphs.1-20, characterized in that the polysaccharide (S) in 10% of RA is made of PP.1-21, characterized in that the content of the polysaccharide (S) is 0.01 to 0.5, mainly 0.05 to 0.5 and preferably of 0.1 to 0.30% by weight of powder of plaster.

23. The method according to any of paragraphs.1-22, characterized in that the plaster add-thinning and dispersing and/or foaming agent.

24. Method of waterproofing plaster, characterized in that the add plaster composition comprising at least one hydrocolloid In an amount of 0.05 - 0.5% by weight of plaster powder containing at least one galactomannan in the solid state, and the aforementioned hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups, where the alkyl contains 2 to 4 carbon atoms, at least one component (A) in an amount not greater than 0.25% by weight of powder of plaster, containing at least one alkylhydroperoxide, in the form of pure oil, diluted in solution, in emulsion or in the form capable of emulgirovanija concentrate, at least one polysaccharide (S) in an amount of 0.01-0.5%, and containing at least one gum selected from natural gums.

25. The powdered composition containing the ore one galactomannan, moreover, the aforementioned hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups, where the alkyl contains 2 to 4 carbon atoms, the solid is based on at least one supported on a carrier component (A) and component (A) is contained in an amount of not greater than 0.25% by weight of powder of plaster and contains at least one alkylhydroperoxide at least one polysaccharide (S) in an amount of 0.01-0.5%, and containing at least one gum selected from natural gums.

26. Molded product in the form of sheets or plates formed from plaster, gidrofobizirovannogo the method according to any of paragraphs.1-24.

27. A product for waterproofing plaster containing at least one compound (A) containing at least one alkylhydroperoxide at least one hydrocolloid (C) containing at least one galactomannan, and the aforementioned hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups, where the alkyl contains 2 to 4 carbon atoms, and at least one polysaccharide (S) containing at IU

 

 

© 2013-2015 Russian business network RussianPatents.com - Special Russian commercial information project for world wide. Foreign filing in English.