Method of preparing cation-stabilised and water-redispersible polymer powder compositions

FIELD: chemistry.

SUBSTANCE: polymer powder compositions are obtained via radical polymerisation of one or more ethylenically unsaturated monomers carried out in an aqueous medium in the presence of a nonionic protective colloidal and/or nonionic emulsifying agent, followed by drying. Aqueous dispersions of polymers undergo drying in the presence of an additional 0.1-20 wt % cation-active protective colloid, in terms of the amount of polymer components of the polymer dispersion. The protective colloid is selected from a group comprising homopolymers or copolymers of one or more cation-active monomers as a drying-promoting agent. The invention also describes cation-stabilised and water-redispersible polymer powder compositions for use in construction chemistry and use of the polymer powder composition in construction chemistry products, in production of adhesives and in production of coating materials.

EFFECT: polymer powder compositions have caking resistance and high redispersibility in water.

9 cl, 3 tbl, 15 ex

 

The present invention relates to a method for producing a cation-stabilized and holder in water of polymer powder compositions by held in the aquatic environment-radical polymerization of one or more ethylene-unsaturated monomers in the presence of nonionic protective colloid and/or nonionic emulsifier and subsequent drying.

To stabilize the aqueous dispersion of polymers can a dispersant having surface-active properties. This function is able to perform a water-soluble compounds as protective colloids or emulsifiers. Stabilization of the dispersions of the polymers can be provided either by steric interactions, for example, nonionic polymers and emulsifiers, either by electrostatic interactions, in the latter case, interactions between the anion active or cationic functional groups in polymers or emulsifiers, or through an appropriate combination of steric and electrostatic interactions.

Upon receipt holder dispersion powders based on such monomers as complex vinyl ethers, vinyl chloride, (meth)acrylates, styrene, butadiene and/or ethylene, which are the most diverse applications, such as coatings or adhesives for a variety of foundations, is as a protective colloid during polymerization and drying is preferable to use polyvinyl alcohol, because it effectively stabilizes the powder from premature adhesion (coalescence) of its particles. When using the same polymer powder in elevated quantities in the finally prepared mixtures and solutions the presence of polyvinyl alcohol may have a negative impact on their properties. So, for example, polyvinyl alcohol can adversely affect the processability containing improves their properties polymer additives hydraulically setting mortars based on cement or gypsum due to the high adhesiveness to Kelme and high viscosity. In addition, polyvinyl alcohol when his presence in large quantities reduces the elasticity of the adhesive joints obtained with the use of mortar.

Possible replacement of polyvinyl alcohol as a contributing drying auxiliary agent are condensation products of formaldehyde with malminkartano acid (DE 2049114), with naphtalenesulfonic acid (DE 2445813), with phenolsulfonic acid (EP 407889), or condensation products of aliphatic aldehydes with dihydroxydiphenylsulfone acid (WO 2005/080478). In addition to these you can also use ligninsulfonate (EP 149098) or functionalized anion active groups of the polyelectrolytes (EP 073807, EP 982351). The disadvantage of all of these alternate the main contributing drying auxiliary agents is necessary for their use in large quantities to obtain resistant to caking and quickly holder in water powders. In addition, the use of the condensation products of formaldehyde with sulfonic acid or ligninsulfonate leads to staining mortar in brown color, which is highly undesirable in certain applications.

Cation-stabilized dispersion powders are already known from the prior art. So, for example, from the publication WO 00/05275 known method lies in the fact that cationic monomers will polimerizuet in aqueous medium and in the presence of the resulting in situ polymer will polimerizuet other monomers. Thus obtained dispersion of the polymer is then subjected to spray drying in the presence of polyvinyl alcohol. A similar method is described in the publication WO 00/05283, according to which through appropriate process control as a result of the copolymer particles with heterogeneous morphology. The disadvantage of this method is that to obtain a polymer powder by spray drying originally obtained polymer dispersion of polyvinyl alcohol as contributing to the drying of the protective colloid to be used in large quantities with all the ensuing and the above disadvantages occurring during the application of powder in higher amounts.

In EP 0770640 describes a method for registervolumehotkey powders, in the exercise of which is subjected to drying the aqueous dispersion of the polymer, the dispersed particles of which have a negative or positive surface electric charge, as well as contributing to the drying agent used polyion with surface charge, the sign of which is opposite to the sign of the surface charge of the dispersed particles of the polymer. The disadvantage of this method is that when the previous process spray drying the mixture of polymer dispersion with a protective colloid possible partial coagulation of the polymer particles, which thus may lead to deterioration of redispersible of the obtained powder.

In the publication WO 98/13411 described receiving holder of polymer powders by spray drying the emulsion polymer (product of emulsion polymerization), containing anionic groups, preferably COOH-group, together with amphoteric polymers, preferably casein or sodium Caseinate. According to the data given in this publication, the protective colloid is used in spray-dried in the amount of 2 to 10 wt.%, however, obtaining absolutely non-sticky granular powders is only possible with the use of protective colloid in an amount not less than 10 wt.%. The disadvantage inherent in the use of casein as a protective to the people, is its natural origin and related fluctuations in the quality of the product, which affects the quality consistency of the powder. In addition, casein, like all proteins, cleaved in alkaline ammonia, which leads to pollution from volatile organic compounds.

Based on the foregoing, the present invention was based on the task to obtain the dispersion powder, which, on the one hand, would allow the advantages of polyvinyl alcohol, and as such, fulfills the function of a binder, and on the other hand, would allow for applications in the construction mixtures and solutions in higher quantities to minimize the negative impact on their processability and improve when used in hydraulically setting building structures elasticity produced from these compounds.

The object of the invention is a method for cation-stabilized and holder in water of polymer powder compositions by held in the aquatic environment-radical polymerization of one or more ethylene-unsaturated monomers in the presence of nonionic protective colloid and/or nonionic emulsifier and drying, characterized in that the resulting aqueous dispersion of polymers is subjected askew the presence of a cationic protective colloid as contributing to the auxiliary drying agent.

For use as a cationic protective colloids suitable polymers with a cationic charge. Such polymers are described, for example, E.W. Flick in Water-Soluble Resins - An Industrial Guide, published by Noyes Publications, Park Ridge, N.J., 1991. It is preferable to use polymers containing cationic monomer units, are particularly preferred monomer units with Quaternary ammonium groups, sulfonium groups and phosphonium groups. Most preferred in this Homo - or copolymers of one or more cationic monomers from the group comprising diallyldimethylammoniumchloride (DADMAC), diallyldimethylammoniumchloride (DADAO), (3 methacrylate)propyltrimethylammonium (MPTF), (3 methacrylate)ethyltrimethylammonium (MATH), (3 methacrylamido)propyltrimethylammonium (MAPTECH), 2-dimethylaminoethylmethacrylate and 3-dimethylaminopropylamine (DMAEMA, respectively DMAEMA, protonated form at pH of not more than 5).

Usually cationic protective colloids contain cationic monomer units in an amount of from 20 to 100 wt.%, preferably from 50 to 100 wt.%, most preferably 100 wt.%, in terms of the total weight of cationic protective colloid. To an acceptable nonionic copolymerizate the monomers include vinyl esters of carboxylic acids with 1 to 15 carbon atoms, such caquineau, finalproject, vinyltoluene, acrylamide, hydroxyethyl(meth)acrylate, hydroxypropyl(meth)acrylate, methacrylates and acrylates of alcohols with 4-13 carbon atoms, polyalkyleneglycol(meth)acrylates with2-C4alkionovymi links and with a molecular weight of from 350 to 2000 g/mol, and N-vinyl pyrrolidone, N-vinylcaprolactam, aryloxypropanolamine and methacryloxypropyltrimethoxysilane, vinyltriethoxysilane and fenilmetilketil and/or mixtures of these non-ionic comonomers.

Cationic protective colloids can be obtained by the known methods of polymerization, in particular by radical polymerization in aqueous solution, in mixtures of solvents or in the presence of salts, including by polymerisation deposition of the polymer, for example, by polymeranalogous transformations in solution or in mixtures of solvents, for example in suspension, or, for example, by polymerization in an invert emulsion. Initiators which can be water or oil soluble, selected from the group including persulfates, peroxides, azo compounds, and two pairs of redox initiators. Mainly the last of these methods is a method of polymerization in invert emulsion, respectively polymerization in emulsion-type water in oil" - allows you to obtain a particularly high molecular weight is cationactive polymers, the molecular mass of which exceeds 5000000 g/mol. Upon receipt of cationic protective colloids by polymeranalogous transformation in order to ensure the presence of a cationic monomer unit corresponding nonionic protective colloids subjected to interaction with cationic compounds. As an example, you can call azetilirovanie cationic polyvinyl alcohol with aldehydes.

Protective colloids are most preferably obtained by polymerization in solution, held in water with a small content of solids (preferably not more than 40 wt.%) in the presence of water-soluble initiators, such as azoinitiator or redox initiators, and optionally in the presence of growth regulators chain, such as mercaptopropionic acid or 2-mercaptoethanol.

Preferred cationic protective colloids with the number To factor Fikentscher) (definition in accordance with DIN 53726, 1%by weight solution in water, 25°C, viscometer, Ubbelohde) in the range from 10 to 250, particularly preferably from 25 to 130. Unlike standard DIN 53726, which describes a method of determining the viscosity of PVC in the viscometer Ubbelohde, is that as the solvent instead of cyclohexanone use water. The viscosity of cationa the effective protective colloids according to the viscometer of Heppler is from 1 to 50 MPa·s, is preferably from 1 to 25 MPa·s, most preferably from 1 to 15 MPa·s (method for the determination of viscosity using a viscometer of Heppler at a temperature of 20°C. according to DIN 53015).

The monomers suitable for the production of aqueous dispersions of film-forming the core polymer include vinyl esters of branched or unbranched alkylcarboxylic acids with 1-15 carbon atoms, methacrylates and acrylates of alcohols with 1-15 carbon atoms, vinylaromatic compounds, olefins, diene or vinylchloride.

To the preferred vinyl esters are vinyl acetate, finalproject, vinylboronate, vinyl 2-ethylhexanoate, vanillaware, vinylbilt and vinyl esters of α-branched monocarboxylic acids with 9 to 13 carbon atoms, for example the products VeoVa9® or VeoVa10® (trade names of products manufactured by the company Resolution). Particularly preferred among the above vinyl esters are vinyl acetate. Among the preferred methacrylates or acrylates include methyl acrylate, methyl methacrylate, acrylate, methacrylate, propylacetate, propylbetaine, n-butyl acrylate, n-butylmethacrylate, 2-ethyl hexyl acrylate and norbornylene. Particularly preferred among them are methyl acrylate, methyl methacrylate, n-butyl acrylate and 2-ethyl hexyl acrylate. As an example, olefins and dienes, you can call these the Yong, propylene and 1,3-butadiene. To an acceptable vinylaromatic compounds include styrene and vinyltoluene. One of the acceptable vinylchloride is vinyl chloride.

If necessary, the basic polymer can also copolymerizate auxiliary monomers in an amount of from 0.05 to 50 wt.%, preferably from 1 to 10 wt.%, in terms of the total weight of the basic polymer. As examples of auxiliary monomers can be called ethylene-unsaturated mono - and dicarboxylic acids, preferably acrylic acid, methacrylic acid, fumaric acid and maleic acid, amides and NITRILES of the ethylene-unsaturated carboxylic acid, preferably acrylamide and Acrylonitrile, mono - and diesters of fumaric acid and maleic acid such as the diethyl and diisopropyl esters, and also maleic anhydride, ethylene-unsaturated sulfonic acids, respectively, and their salts, preferably vinylsulfonic and 2-acrylamide-2-methylpropanesulfonate. As other examples are pre-stitched comonomers, such as ethylene-polyunsaturated comonomers, such as divinerecipes, diallylmalonate, alismataceae or treelistener or secondary link comonomers, for example acrylamidoglycolate acid (AHAs), methyl ether methylacrylamide the acid (MAMAC), N-methylolacrylamide (N-MA), N-methylolmethacrylamide (N-MMA), N-metroselskabet, simple alkalemia esters, such as isobutoxide, or esters of N-methylolacrylamide, N-methylolmethacrylamide and N-methylolacrylamide. For use in these purposes is also suitable comonomers with epoxy functional groups, such as glycidylmethacrylate and glycidylmethacrylate. As other examples of the comonomers with silicon functional groups, such as Acrylonitrile(alkoxy)- and methacryloxypropyl(alkoxy)silanes, vinyltriethoxysilane and fenilmetilketil that as alkoxygroup can contain, for example, metoxygroup, ethoxypropan and groups of ethers of ethoxypropylamine. In addition, you can also use monomers with hydroxy or CO groups, for example hydroxyalkyl esters of methacrylic and acrylic acids, such as hydroxyethyl-, hydroxypropyl - or hydroxyethylacrylate or-methacrylate, and also compounds such as diacetonitrile and acetylacetoneiminates or-methacrylate. Other acceptable comonomers include simple mineralquelle esters, such as vinylethylene ether, unilateraly ether, minimizebutton ether and vinylacetylene ether.

It is suitable for use as the primary polymer Homo - and is opolimers are for example, the homopolymers of vinyl acetate, copolymers of vinyl acetate with ethylene, copolymers of vinyl acetate with ethylene and one or more other complex vinyl esters, copolymers of vinyl acetate with ethylene and acrylates, copolymers of vinyl acetate with ethylene and vinyl chloride, copolymers of styrene with acrylates and copolymers of styrene with 1,3-butadiene.

It is preferable to use homopolymers of vinyl acetate, copolymers of vinyl acetate with 1 to 40 wt.% ethylene, copolymers of vinyl acetate with 1 to 40 wt.% ethylene and 1-50 wt.% one or more other comonomers from the group comprising vinyl esters of carboxylic acids with 1 to 15 carbon atoms, such as WikiProject, vinyltoluene, vinyl esters of α-branched carboxylic acids with 9 to 13 carbon atoms, such as products VeoVa9®, VeoVa10® and VeoVa11®, copolymers of vinyl acetate with 1 to 40 wt.% ethylene and preferably 1-60 wt.% acrylate unbranched or branched alcohols with 1-15 carbon atoms, especially n-butyl acrylate or 2-ethylhexyl acrylate, and copolymers with 30-75 wt.% vinyl acetate, 1-30 wt.% vanillaware or vinyl ester of α-branched carboxylic acid having 9 to 13 carbon atoms, and 1-30 wt.% acrylate unbranched or branched alcohols with 1-15 carbon atoms, especially n-butyl acrylate or 2-ethylhexyl acrylate, which may additionally contain 1-40 the AC.% ethylene, copolymers of vinyl acetate with 1 to 40 wt.% ethylene and 1-60 wt.% vinyl chloride, each of these polymers may further comprise the above-described auxiliary monomers in the stated quantities, as given in wt.% values that define the content of each component in the composition of the corresponding copolymer, the amount in each case add up to 100 wt.%.

It is preferable to use polymers of (meth)acrylates, such as copolymers of n-butyl acrylate or 2-ethylhexyl acrylate or copolymers of methyl methacrylate with n-butyl acrylate and/or 2-hexyl acrylate and under certain conditions, ethylene, copolymers of styrene with (meth)acrylates, in particular with one or more monomers from the group comprising methyl acrylate, acrylate, propylacetate, n-butyl acrylate and 2-ethyl hexyl acrylate, copolymers of vinyl acetate with (meth)acrylates, in particular with one or more monomers from the group comprising methyl acrylate, acrylate, propylacetate, n-butyl acrylate, 2-ethyl hexyl acrylate and under certain conditions, ethylene, and copolymers of styrene with 1,3-butadiene, where each of these polymers may further comprise the above-described auxiliary monomers in the stated quantities, as given in wt.% values that define the content of each component in the appropriate ACPs is of iMER, in sum, in each case add up to 100 wt.%.

Monomers, respectively mass relative content of comonomers is selected when this so that the glass transition temperature TC of the polymer, as a rule, were in the range from -50 to +50°C, preferably from -30 to +10°C. the glass transition Temperature TC of the polymer can be defined in the usual way by the method of differential scanning calorimetry (DSC). Approximate values of glass transition temperature TC can also be pre-calculated using equation Fox (Fox). In accordance with the method of Fox (Fox THUS, Bull. Am. Physics Soc. 1, 3, 1956, p.123) the glass transition temperature can be calculated by the following formula:

,

where xndenotes the mass fraction (wt.%/100) of the monomer n, a Tcn denotes expressed in degrees Kelvin glass transition temperature of homopolymer monomer n. The values of glass transition temperature Tcfor homopolymers are listed in Polymer Handbook Handbook, 2nd ed., published by J. Wiley & Sons, New York, 1975.

Homo - and copolymers are preferably obtained by the method of emulsion polymerization at a temperature, which is usually, but not necessarily must be less than 100°C. the Polymerization regardless of its specific method can be performed using the seed latexes or without their use, and also pre-what recalls in the reactor or of all individual components of the reaction mixture or with partial pre-loading and subsequent dosing of all or individual components of the reaction mixture, or with a gradual dosing of the components of the reaction mixture without downloading them into the reactor. For the preparation of the dispersion in the reactor can be downloaded immediately all the comonomers (a periodic process) or you can download part of the monomers and the remaining part to dose in subsequent (paliperidone process).

The initiate polymerization using commonly used in emulsion polymerization of water-soluble initiators or combinations of redox initiators. As an example, water-soluble initiators can be called sodium, potassium and ammonium salts peroxidizing acid, hydrogen peroxide, tert-butylperoxide, tert-butylhydroperoxide, peroxodisulfate potassium tert-butylperoxide, cumonherface, isopropylbenzaldehyde peroxide and azobisisobutyronitrile. These initiators are usually used in amounts of from 0.001 to 0.02 wt.%, preferably from 0.001 to 0.01 wt.%, in each case, calculated on the total weight of the monomers. As redox initiators used the above initiators in combination with reducing agents. It is suitable for use in this purpose, the reducing agents are the sulfites and bisulfite alkali metals and ammonium, for example sodium sulfite, the derivatives sulfoxylates acid, such as formaldehy sulfoxylate zinc or alkali metal, for example, hydroxymethanesulfinic sodium and ascorbic acid. For this purpose, the reducing agent is usually used in amounts of from 0.001 to 0.03 wt.%, preferably from 0.001 to 0.015 wt.% in each case, calculated on the total weight of the monomers.

To regulate the molecular weight during the polymerization it is possible to apply the so-called growth regulators chain. When using these growth regulators chain they are usually used in amounts of from 0.01 to 5.0 wt.% in terms of the polymerized monomers and injected into the reaction system separately or pre-mixed with other reagents. As examples of such substances can be called n-dodecylmercaptan, tert-dodecylmercaptan, mercaptopropionic acid, methyl ester mercaptopropionic acid, isopropanol and acetic aldehyde.

The polymerization is preferably carried out in the presence of nonionic protective colloid. As such nonionic protective colloids can be used polyvinyl alcohols, polyvinylacetal, polyvinylpyrrolidone, polysaccharides in water-soluble form such as starches (amylose and amylopectin), cellulose and methyl, hydroxyethylene and hydroxyproline derivatives, and poly(meth)acrylamide.

To the preferred protective colloids are partially or completely saponified polyvinyl alcohols is about the degree of hydrolysis of from 80 to 100 mol.%, first of all partially saponified polyvinyl alcohols with a degree of hydrolysis of from 80 to 95 mol.% and with a viscosity determined using a viscometer of Heppler in 4%aqueous solution, from 1 to 30 MPa·s (method for the determination of viscosity using a viscometer of Heppler at a temperature of 20°C., DIN 53015). Preferred partially saponified hydrophobically modified polyvinyl alcohols with a degree of hydrolysis of from 80 to 95 mol.% and with a viscosity determined using a viscometer of Heppler in 4%aqueous solution, from 1 to 30 MPa·S. as an example of such polyvinyl alcohols can be called partially saponified copolymers of vinyl acetate with hydrophobic comonomers, such as isopropenylacetate, vinylbilt, vinylethylene, vinyl esters of saturated α-branched monocarboxylic acids with 5 or 9-11 carbon atoms, diallylmalonate and dialkylphosphate, such as Diisopropylamine and Diisopropylamine, vinyl chloride, simple mineralquelle esters, such as vinylboronic ether, olefins, such as Aten and the mission. The proportion of hydrophobic units should preferably be from 0.1 to 10 wt.% in terms of the total weight of partially saponified polyvinyl alcohol. These polyvinyl alcohols can also be used as mixtures thereof.

The most preferred are polyvinyl alcohols with the degree of hydrolysis of from 85 to 94 mol.% and viscosity, a particular by using a viscometer of Heppler in 4%aqueous solution, from 3 to 15 MPa·s (method for the determination of viscosity using a viscometer of Heppler at a temperature of 20°C., DIN 53015). These protective colloids can be obtained with known methods and add them to polymerization in number, usually a total of from 1 to 20 wt.% in terms of the total weight of the monomers.

The polymerization can also be carried out in the presence of nonionic emulsifiers or in the presence of these nonionic protective colloids in combination with nonionic emulsifiers. As such nonionic emulsifiers can be used surface-active substances (surfactants), such as simple alkylpolyglycoside esters or simple alkylarylsulphonate esters with 8-40 etkilenecegini links. It is preferable to use alkoxysilane8-C16the alkanols, which alkoxysilane2-C4acceleratedly, first with ethylene oxide and propylene oxide or mixtures thereof. Nonionic emulsifiers are added during polymerization in number, usually from 0.05 to 10 wt.% in terms of the total weight of the monomers.

Upon completion of the polymerization of the residual monomers can be removed by the known methods additional polymerization, usually by additional polymerization, the initiation which has been created by the oxidation catalyst-recovery. The remains volatile monomers can also be removed by distillation, preferably under reduced pressure and, if necessary, by passing through the system or on the system of air or water vapor or inert carrier gases, such as nitrogen. The solid content in the obtained in this way the aqueous dispersions of the polymer is from 30 to 75 wt.%, mostly from 50 to 60 wt.%.

To obtain the holder of polymer powders in water aqueous dispersion of polymers, optionally after the addition of cationic protective colloids as contributing to the drying auxiliary agents, subjected to drying. Cationic protective colloid can be used also in combination with a nonionic protective colloid or in combination with a nonionic emulsifier. It is suitable for use in these purposes nonionic protective colloids and nonionic emulsifier include the same nonionic protective colloids and nonionic emulsifiers, which are discussed above as suitable for use in polymerization.

The polymer dispersion can be dried, for example, by drying in the fluidized bed, freeze drying or spray drying. More preferably drying the dispersion polymers by spray drying. Spray drying is carried out at et the m normal designed for that purpose facilities for spraying dispersions of polymers can be used one-, two - or multi-component nozzles or centrifugal atomizer (rotating disk). The temperature output depending on the type of installation and the required degree of drying is usually chosen in the range from 45 to 120°C, preferably from 60 to 90°C.

Cationic protective colloid, which can be used in combination with nonionic protective colloid and/or nonionic emulsifier, typically used in a quantity constituting a total of from 0.1 to 20 wt.%, preferably from 1 to 7 wt.%, in each case, calculated on the amount of polymer components of variance.

When drying of the dispersions of the polymers in the system, it is advisable, as it was installed, add defoamer in an amount up to 2 wt.% in terms of the amount of the basic polymer. To the obtained powders to improve their stability during storage by increasing resistance to caking, which relates to polymeric powders with a low glass transition temperature, you can add a tool against caking (also known as the anti-sintering) in an amount of preferably up to 30 wt.% in terms of the total weight of polymer components. As examples of such anti-caking can aswat calcium carbonate, accordingly, magnesium, talc, gypsum, silicic acid, kaolin, metakaolin and silicate with a particle size predominantly from 10 nm to 100 μm.

Viscosity is subjected to spray drying the dispersion set by regulation of the content of solid substance in such a way that its value was less than 1000 MPa·s (viscosity according to Brookfield at 20 revolutions and 23°C.), preferably less than 500 MPa·s, particularly preferably less than 250 MPa·s solids Content in exposed spray mixture must be more than 30%, preferably more than 40%.

To improve the operational and technical characteristics of the holder of polymer powders in water to the dispersion before, during or after the drying, you can optionally add other additives. Such other components of the dispersion of polymer powder compositions that are added to them in preferred embodiments of the invention, include, for example, pigments, fillers, foam stabilizers, water-repellent agents and plasticizers.

Proposed in the invention cation-stabilized redispersible in water of polymer powder compositions can be used in all areas where they find the traditional use. Proposed in the invention cation-stabilized dispersion powders can also be used in MESI with normal dispersion powders.

Proposed in the invention polymer powder compositions can be used, for example, in products, construction chemicals, if necessary in conjunction with hydraulically setting astringent, such as cements (Portland cement, aluminous cement, trass cement, slag Portland cement, magnesia cement, phosphate cement), gypsum and liquid glass, production of construction adhesives, primarily adhesives for gluing tiles (for example, elastomeric adhesives and thermal adhesives for fastening elements used to create full insulation, plaster, filler, filler for the manufacture of floors, samarasekara compounds, waterproofing slurries, solutions for jointing and paints. Preferred fields of application proposed in the invention polymer powder compositions is their use in waterproofing slurries and adhesives for gluing tiles, including, in particular, and in adhesives for gluing tiles on a wooden base. As an example of other possible applications proposed in the invention polymer powder compositions can be called their use in the production of other adhesives and in the production of materials for coating, for example, paper and textiles.

With the invention it has been unexpectedly found that redlagaemyi it method allows to obtain the dispersion powders, despite the low relative content of cationic polymers as contributing to the drying auxiliary agents, comprising mainly from 1 to 7 wt.%, resistant to caking and exceptionally good registerservlet in the water. In the claimed invention unexpectedly it was found that cationic polymer not only has a positive effect on subsequent processability received proposed in the invention is a method of dispersing powders in solutions and mixtures to improve their properties, polymer additives, such as waterproofing slurries, adhesives for gluing tiles and plaster, but also improves the elasticity of such materials, for example increases determined by razryvnaya elongation tensile strength of waterproofing made from waterproofing slurries with improving their properties of polymer additives.

Examples

Variance 1 (1)

The original dispersion was prepared with 6 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s dispersion of a copolymer of vinyl acetate and ethylene with a solids content of 50 wt.% and with Twithequal to -7°C.

Variance 2 (D2)

The original dispersion was prepared with IP is the use of 5 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s dispersion of a copolymer of vinyl acetate, ethylene product VeoVa10® solids content of 52 wt.% and with Twithequal to -15°C.

Dispersion 3 (D3)

The original dispersion was prepared with 6 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s dispersion of a copolymer of vinyl acetate, ethylene and vinyltoluene with a solids content of 50 wt.% and with TC equal to -24°C.

Dispersion 4 (D4)

The original dispersion was prepared using each time 2.5 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity 4 and 13 MPa·s dispersion of a copolymer of ethylhexyl acrylate and methyl methacrylate with a solids content of 51 wt.% and with Twithequal to -13°C.

Variance 5 (D5)

The original dispersion was prepared using 8 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s dispersion of a copolymer of vinyl acetate and ethylene with a solids content of 55 wt.% and with Twithequal to 16°C.

Variance 6 (D6)

The original dispersion was prepared with 10 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s the var is this a copolymer of vinyl acetate, ethylene product VeoVa10® solids content of 55 wt.% and with Twithequal to 5°C.

Variance 7 (d)

The original dispersion was prepared with 10 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s dispersion of a copolymer of styrene and butyl acrylate with a solids content of 55 wt.% and with Twithequal to 20°C.

Protective colloid 1 (SC) (poly-MATH)

A mixture of 795 g of water and 201 g of 2-methacryloxypropyltrimethoxysilane was placed in a polymerization tank and heated to 73°C. and Then for 180 min, the mixture was continuously dosed out in total 20,12 g of a 10%aqueous solution of initiator (VA-044, represents 2,2'-azo-bis-[2-(2-imidazolin-2-yl)propane]dihydrochloride). Next, the reaction solution was stirred for 30 min at 73°C, and then cooled. The result was 19,8%by weight of a transparent yellowish solution with a pH value of 3.1. Number (coefficient Fikentscher) 1%polymer solution in water was equal 75,9. Determined using a viscometer of Heppler viscosity of 4%aqueous solution was equal to 7.8 MPa·S.

Protective colloid 2 (SK) (poly-MAPTECH)

A mixture of 988 g of water and 6.8 g of a 50%aqueous solution of acetic acid was heated to 80°C. After reaching thermodynamic equilibrium in the mixture is continuously for 180 min at the same time they dosaged 96 g of a 7%aqueous solution of initiator (VA-044, represents 2,2'-azo-bis-[2-(2-imidazolin-2-yl)propane]dihydrochloride) and 910 g of a 50%aqueous solution of 2-metallicametallicametall. Next, the reaction solution was stirred for 60 min at 80°C, then cooled. The result was 25,4%by weight of a transparent yellowish solution with a pH value of 3.4. Number (coefficient Fikentscher) 1%polymer solution in water was equal to 29. Determined using a viscometer of Heppler viscosity of 4%aqueous solution was equal to 1.9 MPa·S.

Protective colloid 3 (SK) (poly-DMAEMA/MATH)

A mixture of 778 g of water, 179 g of 2-dimethylaminoethylmethacrylate and 18 g of 2-methacryloxypropyltrimethoxysilane was placed in a polymerization tank and heated to 73°C. Then the mixture for a period of 180 min was continuously dosed out a total of 22.1 g of a 10%aqueous solution of initiator (VA-044, represents 2,2'-azo-bis-[2-(2-imidazolin-2-yl)propane]dihydrochloride). Next, the reaction solution was stirred for 30 min at 73°C, and then cooled. The result was of 18.2%by weight of a transparent yellowish solution with a pH value of 9.2. Number (coefficient Fikentscher) 1%polymer solution in water was equal to 48.1. Determined using a viscometer of Heppler viscosity of 4%aqueous solution was equal to 5.8 MPa·S.

Other protective colloids, prigodnyh to obtain cation-stabilized polymer powders, are also commercially available protective colloids based on poly-DADMAC, such as products Catiofast® CS BASF or Superfloc® C-592 company Cytec.

Protective colloid 4 (SK)

Catiofast® CS: 30%aqueous solution, To a 1%solution of polymer in water is equal to 72 defined by using a viscometer of Heppler viscosity of 4%aqueous solution is equal to 7.5 MPa·S.

Protective colloid 5 (SK)

Superfloc® C-592: 39%aqueous solution, To a 1%solution of polymer in water is equal to 92 defined by using a viscometer of Heppler viscosity of 4%aqueous solution is equal to 12.2 MPa·S.

Powders

Source dispersion D1-d mixed with protective colloids SC-SC listed in table 1 mass ratio with the addition of the antifoam in the amount of 0.5 wt.% in terms of the solid content in the film-forming polymer, and the mixture was stirred for 30 min and filtered. None of the presented in table 1 formulations of the formation of coagulate was not observed. In conclusion, a mixture of addition of anti-caking in the amount of 12 wt.% in terms of the solid content in the dispersion was spray dried to obtain powders P1-A11.

Comparative example 1 (A12)

Source dispersion D2 was mixed with 9 wt.% polyvinyl alcohol (PVA) with a degree of saponification of 88 mol.% and with a certain use is viscosimeter of Heppler viscosity of 4 MPa·spoke adding 0.5 wt.% antifoam mixture for 30 min was stirred and then filtered. In conclusion, the mixture being added to it anti-caking in the amount of 12 wt.% in terms of the solid content in the dispersion was spray dried.

Comparative example 2 (A13)

The original dispersion (d) was obtained using 12 wt.% product Catiofast® CS dispersion of a copolymer of vinyl acetate and ethylene with a solids content of 49 wt.% and with Twithequal to -5°C. Attempts to obtain a dispersion using a protective colloid in an amount less than 10 wt.% was unsuccessful. The variance (d) was mixed with 6 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·C. After the addition of 0.5 wt.% antifoam mixture for 30 min was stirred and then filtered. In conclusion, the mixture being added to it anti-caking in the amount of 12 wt.% in terms of the solid content in the dispersion was dried by spraying. The result was not resistant to caking powder.

Comparative example 3 (A14)

The original dispersion was obtained using 6 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·s dispersion of a copolymer of vinyl acetate and ethylene with a solids content of 55 wt.% and with Twithequal to 10°C (D9). This var is rsiu was mixed with 8 wt.% polyvinyl alcohol with a degree of saponification of 88 mol.% and with some using a viscometer of Heppler viscosity of 4 MPa·poluchennuyu the mixture was stirred for 30 min and then filtered. In conclusion, the mixture being added to it anti-caking in the amount of 12 wt.% in terms of the solid content in the dispersion was spray dried to obtain the powder A14.

Test

The obtained powders were investigated on their properties and processability as part of the waterproofing slurry.

Determination of strength of compacted powder (SRP)

To determine the strength of compacted powder investigated the dispersion powder was filled in a steel pipe with threaded connections, and then to the powder applied pressure due to the metal plunger. The powder was kept under the action of the applied load in an oven for 16 h at 50°C. After cooling to room temperature, the powder was removed from the tube and qualitatively evaluated its resistance to caking crushing unit, in which he had pressed. The resistance of the powder to caking classified as follows:

score 1 - very good resistance to caking, no clumping

grade 2 - good resistance to caking

grade 3 - satisfactory resistance to caking

point 4 - resistance to caking is missing, the powder after crushing loses flowability

Characterization of sedimentation (XO)

Characteristics settling repeat the but made from powder dispersions serve as a measure of redispersible corresponding powder.

The variance of the investigated powder with a content of 50 wt.%, prepared by re-dispersing in water when exposed to high shear forces. After that, the characteristics of sedimentation was determined using diluted re-prepared dispersions with solids content of 0.5 wt.%). For this purpose, 100 ml of this dispersion was placed in a graduated tube and determines the height of the settled layer of the solid phase. The height of the settled layer of the solid phase in millimeters was measured after 24 h Values greater than 7 mm, indicate poor redispersible powder.

The results of tests on the strength of the compacted powder (SRP) and the results of the characterization of sedimentation (HO) polymer powders are presented below in table 1.

Table 1
Powder No.VarianceProtective colloidSRPHO
P115 wt.% SK22
P2D2 6 wt.% SK21,8
PZD26 wt.% SK1-21,4
A413.5 wt.% SK21,5
P5D23.5 wt.% SK11,6
P6DZ2 wt.% SK23,0
A7D44 wt.% SK22,5
P815 wt.% SK11,1
P9D55 wt.% SK11,6
P10D65 wt.% SK1-2 1,0
A11D5 wt.% SK11,4
A12 (EUR. example)D29 wt.% PVA20,7
A13 (EUR. example)D6 wt.% PVA47
A14 (EUR. example)D98 wt.% PVA21,8

The test results of comparative powder A13 suggests that the use of a cationic protective colloid during polymerization receive the products, which have no registerservlet or resistance to caking.

For the preparation of cement based waterproofing slurry used the following recipe:

quartz sand 665 parts

Portland cement 50 pieces

cellulose 5 parts

the dispersion powder 280 parts

water 400 parts

Processability (TRB) waterproofing slurry of the above composition determine mixing the dry components with water. Definition wide-angle is processing AIDS waterproofing slurries based mainly on a subjective evaluation by the processor. Processability classified as follows:

score 1 - very good processability, no stickiness to Kelme

point 2 - somewhat difficult processability, a slight stickiness to Kelme

point 3 - unsatisfactory processability, viscous and sticky suspension

Of cement based waterproofing slurry squeegee when the width of the gap 2 mm stretched film, which is within 7 days was dried in standard climatic conditions (23°C and 50%relative humidity). After that, the obtained film was evaluated on the elasticity and deformability. These characteristics are classified as follows:

point 1 - homogeneous, smooth film with a very good deformability

point 2 - smooth film with good deformability

point 3 - smooth film with a low deformability

point 4 - the fragile, brittle film with poor deformability

Tensile strength (RP in MPa) and breaking elongation (EN %) of the samples was determined them by a tensile test according to DIN 53455.

The results of the determination processing AIDS, elasticity and rupture strength and rupture elongation of the samples after aging for 28 days in standard climatic conditions are presented in table 2.

Table 2
Powder No.TRBElasticityRP (MPa)RU (%)
A41-211,6100
P5111,4105
A71-221,592
A12 (EUR. example)331,641

For the preparation of cement elastomeric adhesives used the following recipe:

quartz sand 576 parts

cement (a mixture of Portland cement and high alumina cement) 300 parts

simple cellulose ether 4 parts

the dispersion powder 120 parts

water 240 parts

Processability (TRB) (classified in accordance with the above point system) determine mixing the dry components with water. The results are presented below in table 3.

Prognosticate tensile N/mm 2was determined according to standard EN 12004 (standard test methods EN 1348):

A: extract within 28 days in standard climatic conditions

B: extract within 7 days in a standard climate conditions and within 21 days in wet conditions

In: aging for 14 days at standard climatic conditions for 14 days under conditions of elevated temperatures (70°C) and for 1 day in standard climatic conditions

G: aging for 7 days at standard climatic conditions for 21 days in wet conditions and for 5 days under conditions of 25-fold alternating freezing and thawing

The results are presented in table 3.

The deformability of the adhesive in mm was determined in accordance with standard EN 12002. The results of the tests of adhesives containing different dispersion powders are presented in table 3.

Table 3
Powder No.TRBThe adhesive strength under tension (H/mm2)Deformability
(mm)
shutter speedshutter speedshutter speedshutter speed
AndBInG
P911,841,012,361,0011,0
P1011,831,052,311,0711,2
A1112,151,042,41,0811,7
A14 (EUR.2-32,121,11was 2.761,04the 11.6
example)

The above data indicate that upon receipt of the proposed in the invention products in the preparation of the mixture of the dispersion and a cationic protective colloid, and appropriate additives, there are no problems regarding the formation of coagulates. In addition, even when using a cationic protective colloid in very small quantities can get resistant to caking powder, possessing a very good registerservlet. In addition, the obtained powders even at high relative content of these polymers have very good processability, for example, as part of the waterproofing slurries or adhesives for gluing tiles.

Are shown in tables 2 and 3 suggests that we proposed in the invention method, the powders when they are applied in areas where the dispersion powders you want to use in significant quantities, in terms of the containing materials, such as elasticity and processability, superior to traditional powders, stable only polyvinyl alcohol, such as powders A12 and A14.

1. The way to obtain cation-stabilized and dispersively in water of polymer powder compositions by held in the aquatic environment-radical polymerization of one or more ethylene unsaturated monomers in the presence of a protective colloid and/or emulsifier from the group comprising non-ionic protective colloid and a nonionic emulsifier, and drying, wherein the resulting aqueous dispersion of polymers is subjected to drying in the presence of optionally from 0.1 to 20 wt.%, in terms of the number of polymer components of the dispersion polymers, cationic protective colloid from the group consisting of Homo - or copolymers of one or more cationic monomers from the group comprising diallyldimethylammoniumchloride (DADMAC), diallyldimethylammoniumchloride (DADAO), (3 methacrylate)propyltrimethylammonium (MPTF), (3 methacrylate)ethyltrimethylammonium (MATH), (3 methacrylamido)propyltrimethylammonium (MAPTECH), 2-dimethylaminoethylmethacrylate and 3-dimethylaminopropylamine (DMAEMA, respectively DMAEMA) as contributing to the auxiliary drying agent.

2. The method according to claim 1, characterized in that as the cationic protective colloids used polymers containing monomer units with Quaternary ammonium groups.

3. The method according to one of claims 1 and 2, characterized in that the use of cationic protective colloids with the number K (definition in accordance with DIN 53726, 1%by weight solution in water, 25°C, viscometer, Ubbelohde) in the range from 10 to 250.

4. The method according to one of claims 1 and 2, otlichalis the same time, the use of cationic protective colloids viscosity by viscometer of Heppler from 1 to 50 MPa·s (method for the determination of viscosity using a viscometer of Heppler at a temperature of 20°C. according to DIN 53015).

5. The method according to one of claims 1 and 2, characterized in that the cationic protective colloid is used in an amount of from 1 to 7 wt.% in terms of the polymeric components of the aqueous polymer dispersion.

6. The method according to one of claims 1 and 2, characterized in that the ethylene unsaturated monomers will polimerizuet one or more monomers from the group comprising vinyl esters of unbranched or branched alkylcarboxylic acids with 1-15 carbon atoms, methacrylates and acrylates of alcohols with 1-15 carbon atoms, vinylaromatic compounds, olefins, diene and vinylchloride.

7. Cation-stabilized and redispersion in water of polymer powder composition for use in construction chemicals produced by conducted in the aquatic environment-radical polymerization of one or more ethylene unsaturated monomers in the presence of nonionic protective colloid and/or nonionic emulsifier and subsequent drying of the resulting aqueous dispersions of polymers in the presence of a cationic protective colloid as contributing to the auxiliary drying agent.

8. PR is the application of cation-stabilized and redispersion in water of the polymer powder composition according to claim 7 in products construction chemicals for the production of construction adhesives, plasters, plaster, plaster for flooring, samarasekara compounds, waterproofing slurries, solutions for jointing and colors.

9. The use of cation-stabilized and redispersion in water of the polymer powder composition according to claim 7 in the manufacture of adhesives and in the production of materials for coating.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: polymer material contains acrylic polymer, chlorine-containing polymer and inorganic hydroxide. The acrylic polymer is selected from a homopolymer of alkyl(alc)acrylate or copolymer of alkylmethacrylate and alkylacrylate. The chlorine-containing polymer contains 5-70 wt % halogen. The inorganic hydroxide is selected from magnesium hydroxide, zinc hydroxide or mixtures thereof, except a mixture of magnesium hydroxide and zinc oxide or magnesium hydroxide and zinc stannate. Weight ratio between the chlorine-containing polymer and the acrylic polymer is at least 0.3. Polymer material is obtained by mixing the chlorine-containing polymer and inorganic hydroxide in molten acrylic polymer. The polymer material is used to make articles and structural elements in construction.

EFFECT: inorganic hydroxide gives the material high resistance to atmospheric effects.

45 cl, 3 tbl, 6 ex

FIELD: medicine, pharmaceutics.

SUBSTANCE: declared invention concerns hydrogel compositions useful as a dressing material or protective agent, and for application of a wide range of active substances in relation to the skin and tissues of mucosas, such as mouth, including tooth bleaches. The faza-parted, film-forming composition containing an admixture is offered: (a) the first polymer bulking up in water, and the specified polymer is not dissolved in water at pH less than approximately 5.5, or water-soluble polymer; (b) an admixture of hydrophylic polymer and additional low-molecular polymer, capable to formation of hydrogen communications with hydrophylic polymer; (c) the second polymer bulking up in water, and the specified polymer we will not dissolve in water at all value pH; and (d) unessential active substance, in a dissolvent or in an admixture of dissolvents where the composition is exposed to separation of phases at hydration.

EFFECT: treatment of a disease state of various surfaces of a body (teeth, fingernails, skin, mucosas etc).

44 cl, 7 ex

FIELD: medicine.

SUBSTANCE: composition contains water-swelling, water-insoluble polymer, mixed hydrophilic polymer and complementary oligomer able to form hydrogen bond with hydrophilic polymer, and a bleaching agent, preferentially peroxide. The composition is applied a dental bleaching composition and applied on teeth to be bleached, and then removed as the required bleaching is reached. In best versions the composition is unstable and translucent. There are also methods of preparation and application of the compositions.

EFFECT: reduced dental sensitivity and damage or irritation of gums and oral mucous membranes, improved clinical effectiveness.

54 cl, 10 ex

FIELD: chemistry.

SUBSTANCE: there is offered wheel impregnation composition containing aqueous solution of binding agent, oxyethylated lanolin and liquid glass, where a binding agent is a mixed aqueous copolymer emulsion prepared by emulsion polymerisation of methylolmethacrylamide, vinylacetate, butykacrylate, methylmethacrylate and methacrylic acid in mass ratio 1.0:9.0-9.5:2.5-3.0:3.5-4.0:0.04-0.06 respectively with the composition formulation as follows (wt fractions): copolymer emulsion (on dry basis) - 100, oxyethylated lanolin - 3-8, liquid sodium glass - 1-6, water 360-440.

EFFECT: development of wheel impregnation composition improving resistance of sisal-fabric and sisal-cord wheels with operating cost reduction.

1 cl, 1 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: there is disclosed application of inorganic IR-reflecting pigments for dark-coloured moulding compounds containing mixed polymethyl(meth)acrylate and adjugated matrix to 45 wt % containing (wt %): styrene (70-92), acrylonitrile (8-30), additional comonomers (0-22) and inorganic pigments. A moulded piece made of these moulding compounds is characterised with heating rate 50°C/20 min and less. In addition, there is disclosed application of the declared moulded piece over the other moulded piece with using conventional methods.

EFFECT: development of well processed, stable opaque-coloured IR-reflecting moulding compounds.

7 cl, 3 dwg, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: present invention pertains to compositions, with low coefficient of friction for use in friction units of living organisms. Proposal is given of an antifriction composition, containing, as polymer binding mixture (with ratio of components in the binder): methyl methacrylate monomer (27-36 mass units), polymethyl methacrylate polymer powder (72-64 mass units), initiator - benzoyl peroxide 1 mass units (polymer binder A); or a mixture (with ratio of components in the binder): methyl methacrylate (27-36 mass units), copolymer powder (72-64 mass units) with the following content of components: methyl methacrylate - 89 mass units, ethyl methacrylate - 8 mass units, methyl methacrylate - 2 mass units, as well as initiator-benzoyl peroxide - 0.6-1.5 mass units (polymer, binder B) and ultrahigh-molecular polyethylene with 1·106 - 12·106 dalton molecular weight, in powder form (2-15 mass units per 85-98 mass units of polymer binder). Compared to the prototype, the value of coefficient of friction decreases by 2-4 times.

EFFECT: design of a composition, which reduces friction in the maxillotemporal joint of a polymer implant.

3 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention refers to technology of hull-kernel particles which can be used to modify impact strength of poly(met)akrylate moulding compositions. According to method a) water and emulsifier b) are added with 25.0 to 45.0 mass fractions of the first composition containing A) alkylmetacrylate 50.0 to 99.9 mass fractions, B) alkylakrylate 0.0 to 40 mass fractions, C) cohesive monomers 0.1 to 10.0 mass fractions, and D) styrene monomers 0.0 to 8.0 mass fractions, and polymerised, c) added 35.0 to 55.0 mass fractions of the second composition containing E) (met)akrylates 80.0 to 100.0 mass fractions, F) cohesive monomers 0.05 to 10.0 mass fractions, and G) styrene monomers 0.0 to 20.0 mass fractions, and polymerised, d) added 10.0 to 30.0 mass fractions of the third composition containing H) alkylmetakrylates 50.0 to 100.0 mass fractions I) alkylakrylates 0.0 to 40.0 mass fractions and J) styrene monomers 0.0 to 10.0 mass fractions, and polymerised. Method is distinctive in that e) each polymerisation cycle is performed at temperature within 60 to 90°C and f) fractional content of all substances is selected so that total weight A) to J) per total weight of aqueous dispersion exceeds 50.0 mass %. Presented method is used to produce impact strength modifiers minimum content of which provides sufficient improvement of impact strength when tested on cut moulding composition samples, not degrading at the same time other important properties of moulding composition.

EFFECT: production of impact strength modifiers minimum content of which provides sufficient improvement of impact strength when tested on cut moulding composition samples, not degrading at the same time other important properties of moulding composition.

17 cl, 8 tbl

FIELD: composite polymer biomedicine materials containing polymer binder, biocompatible filler and carbon reinforcing filler.

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EFFECT: polymer material having natural bone-like properties.

3 cl, 10 ex, 1 tbl

FIELD: organic chemistry, impregnating compositions.

SUBSTANCE: invention relates to composition used for impregnation of a polishing disk. The composition for impregnation of polishing disk comprises a binding agent aqueous solution representing a mixture of an aqueous emulsion of co-polymer prepared by emulsion polymerization of butyl acrylate, ethyl acrylate, methyl methacrylate and acrylic acid amide with the content of basic substance 50 ± 5%, liquid water glass and oxyethylated lanolin in the following ratio of components, mas. p. p.: copolymer of butyl acrylate, ethyl acrylate, methyl methacrylate and acrylic acid amide as measure for dry residue, 15-50; liquid water glass, 3-12; oxyethylated lanolin, 1-6, and water, 45-105. Invention provides enhancing stability and to reduce cost in making the polishing disk.

EFFECT: improved and valuable properties of composition.

2 tbl, 4 ex

FIELD: polishing materials.

SUBSTANCE: invention relates to manufacturing cotton polishing disks based on friction effect. The composition for making polishing disks comprises a binding agent aqueous solution wherein an aqueous emulsion of copolymer 15-50% of its total mass is used and prepared by emulasion polymerization of butyl acrylate, ethyl acrylate, methyl methacrylate and acrylic acid amide in the ratio, mas. p. p.: butyl acrylate, 140-160; ethyl acrylate, 140-160; methyl methacrylate, 205-231; acrylic acid amide, 17-19. Invention provides enhancing durability of polishing disks and to reduce cost in their making. Invention can be used for polishing table dishware and their parts made of stainless, devices for dental practice, jewelry articles, watches and so on.

EFFECT: improved and valuable properties of composition.

2 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: aqueous dispersion of polymers has particle diameter of at least 1 mcm and contains a fluorescent dye, characterised by that it is obtained via radical polymerisation of a suspension of ethylene-unsaturated monomers in an "oil in water" emulsion, the dispersion phase of which contains at least one fluorescent dye dissolved in at least one ethylene-unsaturated monomer, and has average particle diameter of at least 1 mcm, in the presence of at least one surface-active compound and at least 0.5 wt %, in terms of the monomer, of at least one hydrophobic, non-polymerisable organic compound, a hydrophobic polymer composed of at least one olefin with 2-6 carbon atoms with molar weight Mw of up to 10000, siloxane with molar weight Mw of up to 5000 and/or polystyrene with molar weight Mw of up to 10000. The ethylene-unsaturated monomers used are hydrophobic monomers from a group of acrylic alkylesters with 1-8 carbon atoms, methacrylic alkylesters with 1-8 carbon atoms, vinyl acetate, vinyl propionate, vinyl butyrate, styrene, chlorostyrene and/or α-methylstyrene, and the hydrophobic non-polymerisable organic compound used is aliphatic or aromatic hydrocarbons having 10-50 carbon atoms, alcohols having 10-24 carbon atoms, tetraalkyl silanes, olive oil, perfluoromethyl decalin and/or di-n-butyl dicarboxylic acid esters with 4-6 carbon atoms. The invention also relates to a method of preparing and using an aqueous polymer dispersion, power obtained from said polymer dispersion, binder, a spreading adhesive compound and a paper gluing agent based on said dispersion.

EFFECT: obtaining aqueous polymer dispersions with uniform distribution of particle size and powder based on said dispersions for marking materials.

19 cl, 14 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: composition consists of 20-80 pts.wt bifunctional acrylic oligomer, (meth)acrylic groups in which are bound by a divalent organic group with an ester, carbonate or urethane group, 20-80 pts.wt acrylic monomer selected from a alkyl(meth)acrylates or oxyalkyl(meth)acrylates, where the alkyl is a lower alkyl; 5-25 pts.wt gold salt selected from a group of inorganic salts of gold which are soluble in said acrylic monomer; 0.1-3 pts.wt photoinitiator. Also disclosed is a spatial-mesh polymer material containing dissolved gold in zero valence. Under external thermal and/or photo action, said material, which is a colourless and transparent glass-like material with not less than 90% optical transmission in the visible region, is cable of generating a plasma resonance band in the visible region of the formed gold nanoparticles - gives a response point in the 500-640 nm range. the material is obtained through photo-exposure of the said gold-containing polymerisable acrylic composition.

EFFECT: material is a recoding medium for optical recording of information and is characterised by extremely high sensitivity.

7 cl, 6 dwg, 2 tbl, 28 ex

FIELD: chemistry.

SUBSTANCE: disclosed aqueous dispersion of copolymerisation products containing A) one or more hydroxy-functional copolymerisation products, obtained from the following (wt %): non-hydroxyl containing ester of (meth)acrylic acid and/or vinylaromatic compounds (53.5-87), hydroxy-functional ester of (meth)acrylic acid (2.5-45.9), ionic and/or potentially ionic monomers (0.6-19) capable of radical copolymerisation, as well as, if necessary, other monomers capable of radical copolymerisation which are different from compounds of components a)-c) (0-43.4) and B) at least one hydroxy-functional polycarbonate-polyol as a reactive diluent. Disclosed also is an aqueous coating agent which contains one or more of the disclosed aqueous dispersions of copolymerisation products and at least one cross-linking agent which interacts with hydroxyl groups.

EFFECT: disclosed aqueous dispersions have low solvent content and enable to obtain coatings with high level of resistance of lacquer films, with high scratch resistance and acid resistance.

5 cl, 1 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymer composite materials, particularly a method of producing a nanocomposite based on a liquid crystal polymer and an inorganic semiconductor which can be widely used in laboratory experiments and in industry. The invention discloses a method of producing a nanocomposite which involves mechanical treatment of a solution of a liquid crystal polymer of the type poly-4-(n-acryloyloxyalkoxy)benzoic acid of formula: , where n=3-12, until interchain bonds of the polymer break.The solution is mixed with nanoparticles of the inorganic semiconductor coated with a low-molecular weight organic ligand which contains the same functional group as the polymer and is selected from a group of fatty acids. The obtained mixture is held, chemically bonded nanoparticles are formed and separated and the solvent is distilled off. The inorganic semiconductor used is cadmium selenide, cadmium sulphide or lead sulphide. The fatty acid used is oleic or palmic or linoleic acid.

EFFECT: disclosed method enables to obtain nanocomposites based on liquid crystal polymers which contain nanoparticles of inorganic semiconductors which are included in the volume of the composite in an ordered manner.

2 cl, 4 dwg, 3 ex

FIELD: medicine, pharmaceutics.

SUBSTANCE: declared invention concerns hydrogel compositions useful as a dressing material or protective agent, and for application of a wide range of active substances in relation to the skin and tissues of mucosas, such as mouth, including tooth bleaches. The faza-parted, film-forming composition containing an admixture is offered: (a) the first polymer bulking up in water, and the specified polymer is not dissolved in water at pH less than approximately 5.5, or water-soluble polymer; (b) an admixture of hydrophylic polymer and additional low-molecular polymer, capable to formation of hydrogen communications with hydrophylic polymer; (c) the second polymer bulking up in water, and the specified polymer we will not dissolve in water at all value pH; and (d) unessential active substance, in a dissolvent or in an admixture of dissolvents where the composition is exposed to separation of phases at hydration.

EFFECT: treatment of a disease state of various surfaces of a body (teeth, fingernails, skin, mucosas etc).

44 cl, 7 ex

FIELD: medicine.

SUBSTANCE: composition contains water-swelling, water-insoluble polymer, mixed hydrophilic polymer and complementary oligomer able to form hydrogen bond with hydrophilic polymer, and a bleaching agent, preferentially peroxide. The composition is applied a dental bleaching composition and applied on teeth to be bleached, and then removed as the required bleaching is reached. In best versions the composition is unstable and translucent. There are also methods of preparation and application of the compositions.

EFFECT: reduced dental sensitivity and damage or irritation of gums and oral mucous membranes, improved clinical effectiveness.

54 cl, 10 ex

FIELD: chemistry.

SUBSTANCE: proposed method of producing a water and oil repellent agent involves emulsification of (a) 15-85 wt % perfluoroalkylethylacrylate, (b1) 5-65 wt % 2-ethylhexylmethacrylate and (b2) 1-40 wt % benzyl methacrylate in the presence of (c) a cation surface active substance of the polyethylene oxide adduct type, or neutralised organic acid compound of an amine, with polyethylene oxide chains, and (d) compounds based on polypropylene glycol, with molecular weight 300-3000, or hexylene glycol, with subsequent copolymerisation reaction in the presence of a polymerisation initiator, and mixing the obtained aqueous dispersion with (e) blocked isocyanate.

EFFECT: satisfactory water and oil repellent for synthetic and natural fibre.

5 cl, 22 ex, 5 tbl

FIELD: chemistry.

SUBSTANCE: invention refers to technology of hull-kernel particles which can be used to modify impact strength of poly(met)akrylate moulding compositions. According to method a) water and emulsifier b) are added with 25.0 to 45.0 mass fractions of the first composition containing A) alkylmetacrylate 50.0 to 99.9 mass fractions, B) alkylakrylate 0.0 to 40 mass fractions, C) cohesive monomers 0.1 to 10.0 mass fractions, and D) styrene monomers 0.0 to 8.0 mass fractions, and polymerised, c) added 35.0 to 55.0 mass fractions of the second composition containing E) (met)akrylates 80.0 to 100.0 mass fractions, F) cohesive monomers 0.05 to 10.0 mass fractions, and G) styrene monomers 0.0 to 20.0 mass fractions, and polymerised, d) added 10.0 to 30.0 mass fractions of the third composition containing H) alkylmetakrylates 50.0 to 100.0 mass fractions I) alkylakrylates 0.0 to 40.0 mass fractions and J) styrene monomers 0.0 to 10.0 mass fractions, and polymerised. Method is distinctive in that e) each polymerisation cycle is performed at temperature within 60 to 90°C and f) fractional content of all substances is selected so that total weight A) to J) per total weight of aqueous dispersion exceeds 50.0 mass %. Presented method is used to produce impact strength modifiers minimum content of which provides sufficient improvement of impact strength when tested on cut moulding composition samples, not degrading at the same time other important properties of moulding composition.

EFFECT: production of impact strength modifiers minimum content of which provides sufficient improvement of impact strength when tested on cut moulding composition samples, not degrading at the same time other important properties of moulding composition.

17 cl, 8 tbl

FIELD: heat-curable sealing compositions.

SUBSTANCE: composition is proposed, containing the following mass components: 100 (meth)acrylic monomer or its mixture with an allyic monomer, 0.5-2.5 initiator, 0.01-0.32 hydroquinone, 0.01-0.13 2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl, 0.004-0.05 disodium salt of ethylenediaminetetraacetic acid, 20-125 filler and 5-30 functional additives. The proposed composition has polymerising activity at 100-250°C for 3-8 minutes and breaking stress of 605-15.5 MPa. This adhesive strength is sufficient for withstanding steam pressure of up to 4 MPa. Use of the proposed composition allows for repairing steam pipes with constant supply of steam.

EFFECT: design of a heat-curable sealing composition for repairing steam pipes without interruption of steam supply.

1 cl, 1 tbl, 5 ex

FIELD: physics, photographic material.

SUBSTANCE: invention pertains to polymer cholesteric photoactive compounds, which can independently generate laser emission when irradiated with laser light. Such a compound can be used, for example, in photonics, optoelectronics and telecommunication systems. The cholesteric photoactive compound for generating laser emission consists of cholesteric liquid crystal, photoactive additive and laser dye. The liquid crystal used contains conjoint polymer n-(6-acrylyl oxycapril hydroxyphenyl)-n-methoxy benzoate with cholesterine-11-acrylyl undecanoate, containing molar quantities between 30% and 25% of the cholesterine-11-acrylyl undecanoate links. Photoactive additive used is 2.5-bis(4-methoxy cynnamoyl)-1.4;3.6-dianhydro-B-sorbitol, while the laser dye used is 4-(dicyano methylene)-2-methyl-6-(4-dimethyl amino styryl)-4H-pyran. The invention improves the temporal and thermal stability of the compound, and allows for its use at room temperatures and at lower temperatures as well. Sensitivity of the compound to external effects is also lowered.

EFFECT: increased thermal stability of photoactive compounds and lower sensitivity to external effects.

2 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: moulding composition relates to agriculture, particularly to processing flax production wastes and compositions for producing finishing slabs. The moulding composition contains pile of flax, urea-formaldehyde resin KF-NU, polyvinylacetate dispersion, hardener - ammonium chloride, with given ratio of components, wherein the pile of flax contains a crushed flax in ratio of (1-3):(9-7).

EFFECT: use of the composition enables to obtain low-toxicity finishing slabs with high water resistance.

2 cl, 2 tbl, 7 ex

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