Aqueous agent for applying coating, preparation method and use thereof

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of preparing an aqueous agent for applying coating, as well as an aqueous agent obtained using said method, and use thereof as binder in single-component (1K)-systems and a two-component (2K)-system, and for obtaining a coating on soaking substrates. The method involves the following: (I) polyurethane dispersion which is free from solvent and N-methylpyrrolidone is prepared, where the solvent free dispersion is a dispersion containing 0.9 wt % or less solvent, and the polyurethane dispersion (I) is simultaneously or separately mixed with (II) 1-7 wt % monohydroxyl-functional ethylene- or propyleneglycol ester, as well as (III) other lacquer additives. Wherein I.1) at the first step a NCO-prepolymer solution is obtained in a solvent with concentration of 66-98 wt %, where the solvent has boiling point lower than 100°C at nominal pressure, by reacting: (a) one or more polyisocyanates, (b) one or more polyols with average molecular weight Mn 500-6000, (c) one or more polyols with average molecular weight Mn 62-500, (d) one or more compounds containing a ion group or capable of forming an ion group and the NCO-prepolymer is free from a non-ionic hydrophilisising agent; I.2) at the second step the NCO-prepolymer I.1) is dispersed in water, where before, during or after dispersion, ion groups are at least partially neutralised; I.3) at the third step the chain is elongated by (e) one or more polyamines with average molecular weight Mn less than 500; and l.4) at the fourth step, the solvent is completely removed by distillation.

EFFECT: obtaining an aqueous agent for applying a coating, having improved film-forming properties, as well as obtaining coatings therefrom, having good chemical resistance and pendulum hardness higher than 75 seconds.

13 cl, 5 ex, 4 tbl

 

The invention relates to a method for producing water means for coating and obtained the means for coating or lacquer, and means for applying the coating as a binder component and two-component systems, as well as coatings for absorbing bases.

Water means for coating according to the invention is, in particular, solvent free water based tool dispersion of polyurethane having improved film-forming properties.

In order to reduce the emission of organic solvent are used more and more water means for coating instead of systems containing solvents. An important class of water binders for varnishes are already known in the art are widely described polyurethane dispersion. Solvent-free polyurethane dispersions (in the following called PUD) can be obtained by the acetone method or way mixed prepolymerisation. However, especially for the PUD, which should form a more solid film coatings at room or lower temperature, the necessary coalescence agent, decreasing the minimum temperature of film formation.

In many applications, with the introduction of solvent used is N-methyl shall irreligion, as it does not react with isocyanate groups and therefore suitable to reduce the viscosity upon receipt of prepolymer. In addition, N-organic able to dissolve commonly used in chemistry PUD dimethylolpropionic acid. This ensures that the structure of the polyurethane is injected quite a lot of hydrophilic centers in the form carboxylate groups. But it is noted that N is classified as an organic substance, harmful to fruit and, consequently, for this solvent needs to be replaced.

In the German patent application DE-A 3613492 describes how to obtain not containing co-solvent dispersions according to the so-called acetone method. You get a 20-50%solution of a hydrophilic polyurethane with already a long chain in an organic solvent, such as acetone, and then translate it into a dispersion by adding water. These dispersions are preferably also contain nonionic Hydrophilidae means and can, after drying at room temperature to form a solid transparent film. If you want to reduce the temperature of film formation or slow drying, then share the solvent coalescence, such as diacetone-alcohol, N-organic, monobutyl ether of ethylene glycol or monobutyl ether of diethylene glycol, to which icesto less than 5 wt.% (dispersion) (column 11, lines 58-65). The disadvantage of these systems is that the products do not have sufficient resistance to water and ethanol, and do not provide a sufficient window processing for use solvents coalescence. The disadvantage of this method is the relatively large amount of solvent which must be removed after the stage of dispersion by distillation.

The present invention was to obtain exclusively ion hydrophilizing polyurethane dispersion varnishes containing no solvent and N-methylpyrrolidone. In addition, the composition for coating according to the invention should have a improved film-forming properties, and received from him the coating must have good chemical-resistant, and possess hardness by pendulum device over 75 seconds.

Unexpectedly, this task could be solved by the production of rigid polyurethane dispersions obtained using the low-boiling solvent is removed after dispersion by distillation, followed by mixing with a high boiling point (the boiling point of >150°C) ethers of ethylene - or propylene-glycol and, if necessary, thickeners and/or the means for facilitating the filling and/or defoamers and/or other assistive technology for varnishes. These contain rest ritel dispersion varnishes better form a film, especially on absorbent substrates than lucky with other co-solvents, such as N-organic used in the same quantities. A dispersion containing glycol co-solvent, have a minimum temperature of film formation below 20°C and form a solid particularly high-quality coatings with very good film optics, which can also be applied to the surface, such as a tree.

Therefore, an object of the present invention is a method of obtaining water means for coating, characterized in that

I) receive does not contain solvent and N-methylpyrrolidone polyurethane dispersion, and

I.1) first stage receive the solution prepolymer isocyanate (NCO-prepolymer) having at normal pressure a boiling point below 100°C. the solvent with a concentration of from 66 to 98 wt.% through interaction:

a) one or more polyisocyanates,

b) one or more polyols with an average molecular mass Mnfrom 500 to 6000,

c) one or more polyols with an average molecular mass Mnfrom 62 to 500,

d) one or more compounds containing an ionic group or capable of forming an ionic group;

I.2) in the second stage the isocyanate prepolymer (NCO-prepolymer) I.1) was dispersed in water, p is item before, during or after the dispersion is carried out, at least partial neutralization of the ionic groups;

I.3) in the third stage, carry out chain elongation

e) by means of one or more polyamines with an average molecular mass Mnbelow 500;

I.4) in the fourth stage completely remove the solvent by distillation and finally

II) was added to the polyurethane dispersion (I) from 1 to 7 wt.% simple ethylene or propylene glycol ethers, and

III) other additives for lacquers together or separately.

The object of the present invention are also water remedy for the coating obtained by the method according to the invention.

Polyurethane dispersion according to the invention preferably has a content of hard segment (HS) from 50 to 85 wt.%, particularly preferably, from 55 to 75 wt.%, the amount of isocyanate is between 35 and 55 wt.% from the content of solids, preferably between 39 and 50 wt.%. Acid number of the solid resin is between 12 and 30 mg KOH/g solid resin, preferably between 15 and 28 mg KOH/g solid resin. The content of the hard segment is calculated as follows:

As component (a) suitable commonly used in polyurethane chemistry, the polyisocyanates such as diisocyanates of the formula R1(NCO)2and R 1means aliphatic hydrocarbon radical with 4 to 12 carbon atoms, a cycloaliphatic hydrocarbon radical with 6 to 15 carbon atoms, an aromatic hydrocarbon radical with 6 to 15 carbon atoms or analiticheskii hydrocarbon radical with 7 to 15 carbon atoms. Examples of preferred diisocyanates are tetramethyldisilane, hexamethylene-diisocyanate, 4,4'-diisocyanatobutane, 2,4'-diisocyanato-difenilmetana, 2,4-diisocyanate, 2,6-diisocyanatomethyl or α,α,α',α'-tetramethyl-m - or p-xylylenediisocyanate, and also mixtures of the aforementioned diisocyanates. Particularly preferred diisocyanates are 1-isocyanato-3,3,5-trimethyl-5-isocyanato-methylcyclohexane (isophoronediisocyanate) and 4,4'-diisocyanatomethyl-hekselman.

If necessary, you may use a small amount, for example, three and/or more vysokoudoynyh isocyanates to provide a certain degree of branching or crosslinking of the polyurethane. The number of added MDI is calculated on the basis of its functionality and is determined so that prepolymer isocyanate (JI-prepolymer) would still capable of stirring and dispersing. Get, for example, isocyanates, in which the diatomic isocyanates interact with each other to transform part of their isocyanate the groups in which, biuret, allophanate, uretdione or carbodiimide groups. Suitable such polyisocyanates, hydrophilisation through ionic groups. Examples of such isocyanates are described in European patent EP-A 510438 in which the polyisocyanates are subjected to interaction with the hydroxyl-containing carboxylic compounds. Hydrophilisation the polyisocyanates receive, in addition, the interaction of polyisocyanates with reactive towards isocyanate compounds containing acid groups. Such polyisocyanates may have high functionality, for example, above 3.

Suitable polymeric polyols b) have a molecular mass (Mnin the range from 500 to 6000, preferably from 500 to 3000 and most preferably from 650 to 2500. Hydroxyl functionality (THE functionality) is at least 1.8 to 3, preferably from 1.9 to 2.2, and most preferably of 1.92 to 2.0. In relation to the polyols it is, for example, about complex polyesters, simple polyethers based on propylene oxide and/or tetrahydrofuran, polycarbonates, politicalmath, Polyacetals, polyolefins, polyacrylates and polysiloxanes. Preferably, use polyesters, polyethers, polyester-carbonates and polycarbonates. Particularly suitable bifunctional simple and complex p is leathery, politicalparty and polycarbonates. Also suitable mixture described polymer polyols (b).

In a mixture with the aforementioned polyols b) may optionally be used containing fatty acid polyesters b1)obtained by the reaction of esterification or interesterification drying and/or drying fatty acids or oils, at least bifunctional polyol as one compounds, such as described in European patent application EP-A 0017199 (p.10, line 27 - page 11, line 31). As a polyol as one of the compounds used, preferably, three - and tetrafunctional hydroxyl components, such as trimethylated, trimethylolpropane, glycerin or pentaerythritol.

As the polyol b1) is also suitable partially digitalisierung castor oil obtained by thermal processing of castor oil in the presence of acidic catalysts described in European patent application EP-A 0709414 (page 2, lines 37-40).

As the polyol b1) is also suitable such polyols as described in the German application for the patent DE-A 19930961 (page 2, lines 46 to 54; p.2, line 67 page 3, line 3). In this patent the aliphatic and cycloaliphatic monocarboxylic acids with 8 to 30 carbon atoms, such as oleic acid, lauric acid, linoleic acid or linolenic acid, is subjected to the interaction with the spacecraft is corovim oil in the presence of glycerol.

In addition, as the polyol b1) suitable products of the transesterification of castor oil and one or more other triglycerides.

Especially suitable as component b1) are statistically averaged relative to the hydroxyl groups of a bifunctional fatty acid components containing parts of glycerol or trimethylolpropane. Especially suitable products of interesterification with an average hydroxyl functionality of 2 of castor oil with another oil that is different from castor oil. Containing fatty acid polyester b1) is used, preferably, the polyol (b)having a molecular weight (Mnfrom 650 to 2500 g/mol and a hydroxyl functionality of from 1,92 to 2. Containing fatty acid polyester b1), is used particularly preferably, the polyol (b)having a molecular weight (Mnfrom 650 to 2500 g/mol and a hydroxyl functionality of from 1,92 up to 2, selected from the group of ester, simple ether, carbonates or overcarbonation.

Low molecular weight polyols (C) with a molecular mass (Mnfrom 62 to 500, preferably from 62 to 400, and particularly preferably from 90 to 300 are typically used in polyurethane chemistry of bifunctional alcohols, such as ethanediol, 1,2 - and 1,3-propane-diol, 1,2-, 1,3 - and 1,4-butanediol, 1,5-pentanediol, 1,6 - hexa the diol, Neopan-tipical, cyclohexane-1,4-dimethanol, 1,2 - and 1,4-cyclohexanediol, 2-ethyl-2-buypropecia, diols containing ether oxygen of simple ether, such as diethylene glycol, triethyleneglycol, tetraethylene glycol, dipropyleneglycol, tripropyleneglycol, polyethylene-, polypropylene - or polietilenglikoli, as well as mixtures of these products. Partially can also be used monofunctional alcohols with 2-22 carbon atoms, preferably from 2-18 carbon atoms. These include, for example, ethanol, 1-propanol, 2-propanol, primary butanol, secondary butanol, n-hexanol and their isomers, 2-ethyl-hexyl alcohol, onomatology ether of ethylene glycol, onomatology ether of diethylene glycol, monobutyl ether of ethylene glycol, monobutyl ether of diethylene glycol, onomatology ether propylene glycol, onomatology broadcast dipropyleneglycol, onomatology broadcast tripropyleneglycol, monobutyl ether of propylene glycol, monobutyl broadcast dipropyleneglycol, monobutyl broadcast tripropyleneglycol, 1-octanol, 1-dodecanol, 1-hexadecanol, lauric alcohol and stearyl alcohol.

Partially can be used three or more highly functional alcohols with the specified limit values of molecular weight in such a number, in which the polymer solution remains capable of stirring.

As a neutral the respective components for anionic dispersions suitable well-known specialist tertiary amines, ammonia and hydroxide of alkali metals. The cationic resin is transferred through protonation or quaternization in water-soluble form.

As component (a) suitable low molecular weight compounds containing an ionic group or capable of forming an ionic group, such as dimethylolpropionic acid, Dimethylol-butyric acid, hydroxypivalic acid, the products of the interaction of (meth)acrylic acid and polyamines (for example, German patent application DE-A-19750186 (page 2, lines 52-57) or containing sulphonate groups polyol as one of the components, such as propoxycarbonyl product join hydrosulfite of sodium 2-butandiol or described in European patent application EP-A 0364331 (p.6, lines 1-6) polyester derived from salts sulfoisophthalic acid. In addition, a suitable hydroxycobalamin compounds which contain cationic groups or units, capable of being converted into cationic groups, such as N-methyldiethanolamine. Preferred are components containing carboxyl group carboxylic acids. Especially preferred is dimethylolpropionic acid.

Preferably, the isocyanate prepolymer (JI-prepolymer) does not contain a nonionic hydrophilizing tools.

As chain extension (e) suitable am napolioni or polyamine with molecular weight less than 500, such as hydrazine, Ethylenediamine, 1,4-diaminobutane, ISOPHORONEDIAMINE, 4,4'-diamino-dicyclohexylmethane, ethanolamine, diethanolamine, piperazine or Diethylenetriamine.

Besides using reactive towards isocyanate compounds may also be used in the reaction chain breakage of prepolymer polyurethane monofunctional alcohols or amines, in order to regulate the molecular weight of the polyurethane. The preferred compounds are the aliphatic monosperma or monoamines with 1-18 carbon atoms. Particularly preferable to use ethanol, n-butanol, monobutyl ether of ethylene glycol, 2-ethylhexanol, 1-octanol, 1-dodecanol, 1-hexadecanol or N-dialkyl-amines.

As a solvent to obtain a polyurethane dispersion (I) suitable solvent, such that at normal pressure boil below 100°C, do not contain reactive towards isocyanate groups and, in addition, are water-soluble. In addition, the solvent must be removed from the obtained dispersion by distillation. Examples of such solvents are acetone, methyl ethyl ketone, trebuyetsya ether or tetrahydrofuran.

The receipt of this solvent-free aqueous polyurethane dispersions proceeds in four stages. First shall obtain isocyanate of prepolymer (NCO-pre the polymer) interaction of an excess of component (a) with components (b), C) and d). When the isocyanate prepolymer must have an isocyanate functionality (NCO-functionality) is 2.3. The solvent may be added before, during or after prepolymerisation in sufficient quantity to education 66-98%-aqueous solution, preferably 75-95%-aqueous solution. Required to neutralize potentially ionic groups, the neutralizing agent may be present already at the beginning of the reaction, but it must be added no later, however, add ready prepolymer, because no water is added to the dispersion. The amount of neutralizing amine before the dispersion can also be split between organic and aqueous phase. In the second stage, carry out the dispersion. When water is added to the resin or, on the contrary, the resin in water at a sufficiently vigorous stirring. In the third stage, carry out the elongation of the polymer chain, and the number of nitrogen-containing reactive towards isocyanates of component e) is determined such that could react from 25 to 105%, preferably from 55 to 100%, most preferably from 60 to 90% of the isocyanate groups. The remaining isocyanate groups react with the existing water in the lengthening of the chain. Complete distillation of the solvent is carried out mainly in the vacuum in the fourth stage.

Ter is in "solvent free" in this application means, the dispersion contains ≤0.9 wt.%, preferably ≤0.5% and, most preferably, ≤0.3 wt.% the solvent.

The content of solids in solvent free dispersion ranges from 25 to 65 wt.%, preferably, from 30 to 50 wt.% and, most preferably, from 34 to 45 wt.%.

To obtain according to the invention the means for coating the mixed solvent free dispersion with 1-7 wt.%, preferably 1-5 wt.% by weight of dispersion (I) monohydroxybenzene ethylene or propylene glycol simple ester (II) or a mixture of such esters II). Examples of such monoperoxyphthalic ethylene - or propylene-glycol ethers are methyl ether of ethylglycol, ethyl ester ethylglycol, ethyl ester ietilpigos, methyl ether of ietilpigos, methyl triethyl ether glycol, butylglycol, build and glycol, methyl ether of propylene glycol, methyl ether of dipropyleneglycol, methyl ester tripropyleneglycol, butyl ether of propylene glycol, monopropylene ether of propylene glycol, monopropylene broadcast dipropyleneglycol, phenyl ether of propylene glycol and phenyl ether of ethylene glycol. Preferred are onomatology ether ethylglycol, butylglycol, butyldiglycol, onomatology ether propilenglikola and monobutyl ether of propylene glycol.

The ether of the mixture of esters, preferably, add with stirring in aqueous solution, because the components are water soluble. The water-insoluble components are added to the dispersion slowly with stirring. Partially can also be used esters of ethylene or propylene glycols, not containing hydroxyl groups, such as dimethyl ether ethylglycol, dimethyl ether triacylglycerol, dimethyl ether ietilpigos or Proglyde® DMM (dimethyl ether of dipropyleneglycol), Dow Chemical (Schwalbach, Germany).

In containing the co-solvent agent for coating, in conclusion, add additives for lacquers (III). They are, for example, defoamers, deaerators, thickeners, additives that improve the filling, or surface-active substances.

Commonly used commercial defoamers injected, preferably, first under stirring. These include mineral oil, silicone defoamers, polymers not containing silicone defoamers, and polyethylsiloxane copolymers.

As deaerators use polyacrylates, Dimethylol-siloxanes, organically modified polysiloxane, such as polyoxyethylenesorbitan and Versiliana.

In addition, use thickeners, contributing to the regulation of the viscosity of funds for the NAS is the basis of the coating according to the invention, accordingly, the method of coating. As suitable thickener commonly used commercial thickeners, for example, natural organic thickeners, such as, for example, dextrins or starch, modified organic natural substance, for example, ethers, cellulose or hydroxyethylcellulose, organic fully synthetic thickeners, for example, (polimet)acrylic compounds or polyurethanes, as well as inorganic thickeners, such as bentonites and silicic acid. Preferably use organic fully synthetic thickeners. Most preferred are acrylate thickeners, which before adding, if necessary, further diluted with water.

You can also add a way of improving the filling, and surface-active substances such as silicones, ionic or nonionic acrylates or low molecular weight polymers.

Can also be added as a wetting for (basics) silicone surfactants, such as prefermentation polydimethylsiloxane.

Adding components II) and III) can be carried out with a time shift, as described above. However, they can also be added simultaneously, in this case polyurethane dispersion together to relax the Ute or firstarray solvent and additives for varnish, or a mixture firstarray solvents and additives for lacquers. In the dispersion (II) may also be added to the mixture of additives III) and firstarray solvents II).

Getting varnish is carried out at a temperature between 5 and 50°C, preferably between 20 and 35°C.

Received the tool for coating according to the invention can be applied in the form of physically drying one-component (1K)system or as a two-component (2K)systems.

Therefore, an object of the present invention is also the use of water resources for coating according to the invention as a binder in one-component (1K)systems or as a component of adhesives in two-component (2K)system.

Curing 2K-systems dispersions according to the invention is carried out, preferably, well-known specialist hydrophilic and/or hydrophobic polyisocyanates for varnishes. When using polyisocyanates for varnishes may require additional dilution of their co-solvents in order to achieve good mixing polyisocyanates with dispersion. As the solvent used for this are not able to interact with isocyanate groups solvents, such as dimethyl ether ethylglycol, dimethyl ether triacylglycerol, dimethyl ether ietilpigos, Proglyde® DMM (dimethyl ether diprop is langille), butyl acetate, methoxybutyl or dibasic esters, for example, offered by the company DuPont.

Means for coating according to the invention can be applied to any substrates, for example wood, metal, plastics, paper, leather, textiles, felt (cloth), glass or mineral substrate, and the substrate with a coating. Especially preferred is the use of water resources for coating to obtain a coating on absorbent substrates, such as wood or mineral substrate with open pores.

Means for coating according to the invention can be used by themselves or in combination with other known technologies lacquer auxiliary substances and additives, such as fillers and pigments.

Application for obtaining coatings containing polyurethane dispersion according to the invention can be carried out with known methods, for example, by a brush, shimmer, squeegee, molding, spray, centrifugation, roller or dipping.

Examples

Table 1:
The components used
Trade nameNameManufacturer
Desmodur® W4,4'-diisocyanato-dicyclohexylmethaneBayer AG, Leverkusen, Germany
Desmodur® IIsophorondiisocyanateBayer AG, Leverkusen, Germany
Bayhydur® VP LS 2236Hydrophilizing the polyisocyanate; 16.2 wt.% NCOBayer AG, Leverkusen, Germany
Proglyde® DMM (dimethyl ether of dipropyleneglycolDimethyl ether of dipropyleneglycolDow Chemicals, Schwalbach, Germany
Poly THF®Polytetra methylene-glycol, F=2, mol. mass.≈2000 g/molBASF, Ludwigshafen, Germany
Byk® 381Tool that improves fillingByk Chemie, Wesel, Germany
Byk® 346The wettingByk Chemie, Wesel, Germany
Byk® 028AntifoamByk Chemie, Wesel, Germany
Acrysol® RM8Thickener, 5%in waterRohm&Haas, Frankfurt Germany
Dowanol® TPnBButyl ether of tripropyleneglycolDOW Chemicals, Schwalbach, Germany
Dowanol® PnBButyl ether of propylene glycol.DOW Chemicals, Schwalbach, Germany

Pre-stage gain of ester oligomer.

In the reactor 5 l with distillation section was loaded 3200 g of castor oil and 1600 g of soybean oil, and 2.0 g of oxide dibutil-tin. After the reaction mixture was passed a stream of nitrogen (5 l/h). Over 140 minutes was heated to 240°C and after exposure for 6 hours at 240°C was cooled. The hydroxyl number was 108 mg KOH/g, an acid number of 2.5 mg KOH/g

Variance 1

205,5 g of polyester (adipic acid, 1,6-hexanediol: hydroxyl number 66 mg KOH/g), 19 g dimethylolpropionic acid and 58,0 g of 1,6-hexandiol was obezvozhivani in vacuum at 110°C. Then cooled to 55°C., successively mixed with to 124.2 g of acetone and 226,9 Desmodur® I and boiled with reverse flow (reflux) until the content of isocyanate groups of the NCO of 3.9 wt.% (theoretical NCO content of 4.0%). Again brought to 55°C. and a clear solution was mixed with 12.9 g of triethylamine, which is well mixed. All neutralized solution prepolymer (55°C) was dispersible in 770 g of water, trying to relax is whether at a temperature of 30°C with vigorous stirring. After dispersion was continued to stir for another 5 minutes before the 5 minutes was added a solution of 4.2 g of hydrazine hydrate and 9.2 g of Ethylenediamine dissolved in 90 g of water. In conclusion, this was removed the acetone by distillation at 40°C under vacuum (120 mbar). To complete the reaction of the remaining isocyanate groups was stirred at 40°C up until infrared spectroscopy (IR spectroscopy) were not found more of the content of isocyanate groups of the NCO. After cooling to 30°C was filtered through a Seitz filter T.

Technical characteristics of the polyurethane dispersion:

The average particle size60 nm (laser correlation spectroscopy, LKS)
pH (20°C) (10%aqueous solution):7,8
solids content:35,0%
the content of hard segments:61%
acid number (solid resin):15,5 mg KOH/g

Variance 2

A mixture of 181,0 g of PolyTHF® 2000, 140,3 g of the polyester oligomer with a preliminary stage, 37,2 g dimethylolpropionic acid and 18.3 g of hexanediol mixed at 55°C With 98 g of acetone and of 19.6 g of triethylamine and stirred. Added of 275.4 g of Desmodur® W and boil the reaction mixture with reverse flow (reflux) up until the content of isocyanate groups of the NCO reaches of 4.3%. 500 g of prepolymer was dispersively with vigorous stirring in 720 g of water, which was injected at a temperature of 30°C. After 5 minutes was added over 5 minutes a solution of 4.2 g of hydrazine hydrate is added and 6.2 g of ethylene diamine in 73 g of water. For complete interaction of the isocyanate groups was stirred at 45°C up until infrared spectroscopy showed more presence of the isocyanate groups of the NCO. After cooling was carried out by filtration through a Seitz filter T.

Technical characteristics of the polyurethane dispersion:

The average particle size (LKS):55 nm
pH (20°C) (10%aqueous solution):8,4
solids content:35,0%
the content of hard segments:52%
acid number (based on solid resin):23,3 mg KOH/g

Comparative example 3 (N-organic).

to 300.7 g of polyester (adipic acid, 1,6-hexanediol; hydroxyl number 66 m is KOH/g), 27.8 g dimethylolpropionic acid and 84.8 g of 1,6-hexandiol was obezvozhivani in vacuum at 110°C. Then cooled to 90°C and by adding 181,7 g of N-methylpyrrolidone (NMP*) was obtained transparent solution to 70°C was added 332,1 g Desmodur® I. At 90°C was stirred until the isocyanate content of NCO groups of 3.8 wt.% (theoretical NCO content of 4.0 wt.%). Then at 70°C was added to 21.0 g of triethylamine and stirred for another 10 minutes. 700 g of the neutralized solution was dispersible in 810 g of water, which was injected at a temperature of 30°C, with vigorous stirring. After dispersion was continued to stir for another 5 minutes, until the expiration of 5 minutes was added a solution of 4.2 g of hydrazine hydrate and 9.2 g of Ethylenediamine dissolved in 90 g of water. For the interaction of isocyanate groups was stirred at 40°C up until infrared spectroscopy did not prove the absence of isocyanate groups of the NCO. After cooling to 30°C was filtered through a Seitz filter T.

Characteristics of the polyurethane dispersion:

The average particle size (LKS):60 nm
pH (20°C) (10%aqueous solution):7,8
solids content:35,0%
content zorastorian the*: 8,3%
* Tried to reduce the number of N-methylpyrrolidone to obtain a dispersion containing co-solvent 5%, while it is not formed of a high-viscosity melt resin, which cannot be fully dispersed.

Comparative example 4 (N-organic).

339 g of PolyTHF® 200, 248 g obtained at the preliminary stage of the polyester oligomer, 70 g dimethylolpropionic acid, 34 g of 1,6-hexandiol and 186 g of N-methylpyrrolidone was heated to 70°C. and stirred until a clear solution is formed. Then added 516 g of Desmodur® W, and was heated to 100°C. At this temperature, was stirred until the isocyanate content of NCO groups of 4.6% and then cooled to 70°C. At this temperature was added 39 g of triethylamine. 500 g of this solution was dispersively with vigorous stirring in 640 g of water, which was added at 30°C. After the dispersion was stirred for another 5 minutes. Before the 5 minutes was added a solution of 4.1 g of hydrazine hydrate is added and 10.2 g of Ethylenediamine in 100 g of water. For complete interaction of the isocyanate groups was stirred at 45°C up until the IR-spectroscopy were found to have more content available isocyanate groups. After cooling to 30°C was filtered through a Seitz filter T.

Characteristics of the polyurethane dispersion:

Average particle size:45 nm
pH (20°C) (10%aqueous solution):8,2
solids content:35,0%
the co-solvent content:5,1%

Comparative example 5

500 g of the polyester from adipic acid and 1,6-hexanediol and neopentyl glycol (molar ratio of 0.65:0.35 in) with a hydroxyl number 66 and 59.0 g of the second polyester of adipic acid and 1,6-hexanediol with a hydroxyl number 133 was mixed with 31.5 g of 1,4-butanediol, 43 g of polyether-based reaction product of a mixture of 84% ethylene oxide and 16% of propylene oxide with n-butanol (hydroxyl number of 26), with 40.2 g dimethylolpropionic acid and 13.4 g trimethylol-propane and at 70°C cooperated with 488,0 g Desmodur® I to isocyanate content of NCO groups in the isocyanate prepolymer of 7.3%. Received prepolymer was dissolved in 2420 g of acetone and 30°C were added to 30.3 g of triethylamine. Then the solution prepolymer was added within 5 minutes to 24 g of Ethylenediamine, 10.3 g of Diethylenetriamine and 310 g of water. After 15 minutes of stirring was added 2110 g under vigorous stirring. From the obtained dispersion acetone was removed under reduced pressure is.

The properties of the polyurethane dispersion:

Average particle size:115 nm
pH (20°C) (10%aqueous solution):7,4
solids content:35,0%

Film-forming properties of dispersions

Not containing co-solvent dispersion 2 was divided and diluted by various mixtures of the co-solvent/water or directly by the co-solvent (which is outlined in Table 2 by an asterisk ( * ) if the co-solvent did not mix well with water. Received containing the co-solvent dispersion was applied onto a glass plate squeegee when the layer thickness of the wet film 210 μm. After drying the film at 20°C was evaluated result (table 2).

For comparison inflicted comparative dispersion 4 (co-solvent content of 5.1%) without other additives at the same film thickness. After drying, got a smooth transparent film without cracks (scratches).

Table 2:
Film obtained by adding different amounts of co-solvent/water dispersion 2 containing no co-solvent. As a thickener was added to 2% (by weight dispersion) 5%-nagrastar Acrysol® RM8.
The co-solvent3% of co-solvent by weight of dispersion5% of co-solvent by weight of dispersion
ButylglycolSmooth, without cracks (scratches)Smooth, without cracks (scratches)
ButyldiglycolSmooth, without cracks (scratches)Smooth, without cracks (scratches)
TripropyleneglycolSmooth, without cracks (scratches)Smooth, without cracks (scratches)
Dowanol® TPnBSmooth, without cracks (scratches)Smooth, without cracks (scratches)
Dowanol® PnBSmooth, without cracks (scratches)Smooth, without cracks (scratches)
N-organicMany long cracks (scratches)A little long cracks (scratches)

Studied film-forming properties, as well as the hardness of various dispersions containing different amounts of co-solvent (cosolvent) (see Tables 3 and 4). As a thickener was added to 2% (from the assy dispersion) of a 5%solution of Acrysol® RM8. Resistance to ethanol and water was determined to put on a tree films. The coating was pre-dried for one day at room temperature. Resistance to ethanol has identified five overlapping on the floor soaked in ethanol piece of cotton wool. Wool covered a small chemical glass. The resistance was determined in a similar way, but the impact on the coverage continued for 24 hours

Sustainability assessment:

1 = bad, fracture coatings;

5 = very good, floor is not changed.

Table 3:
Film-forming properties and hardness.
Example 1Example 1Example 2Comparative example 5
Variance, g10010089,3100
Byk@ 346/Byk® 381, g0,2/0,50,2/0,50,18/0,450,2/0,5
The co-solventbutylglycolbutylglycol butylglycolbutylglycol
The co-solvent content, in % by weight dispersion3,74,84,03,7
The temperature of application20°C4°C20°C20°C
Optics on raw woodvery goodvery goodvery goodvery good
Optics on glassvery goodvery goodvery goodvery good
Hardness by pendulum device Koenig 2d/RT, 210 μm in the wet state11511287102
Resistance to ethanol333-41
Water resistance 4-54-551

Table 4:
Comparison of 2K systems, diluted with N-organic or butyldiglycol.
VarianceExample 1Example 1Example 2Example 2
The amount of dispersion, gwith 76.8 gwith 76.8 g75,3 g75,3 g
Bayhydur® VP LS 2336 65% in Proglyde® DMM9.0 g9.0 g9.0 g9.0 g
N-an organic/water1.7 g/8,3 g1.7 g/8,3 g
Butyl, diglycol/water1.7 g/8,3 g1.7 g/8,3 g
Byk® 0281,01,01,0 1,0
Byk® 3460,20,20,20,2
Byk® 3810,50,50,50,5
Acrysol® RM/water1 g/1 g1 g/1 g1 g/1 g1 g/1 g
The co-solvent content,% a 4.9a 4.9a 4.9a 4.9
The temperature of application4°C4°C4°C4°C
Optics on raw woodvery goodgoodvery goodlittle cracks (scratches)
Optics on glassvery goodvery goodvery goodvery good

1. The method of obtaining odnovozrastna for coating, characterized in that
I) receive free of solvent and N-methylpyrrolidone polyurethane dispersion, under free solvent dispersion, see dispersion containing less than or equal to 0.9 wt.% solvent, and
I.1) first stage receive a solution NCO-prepolymer in having at normal pressure a boiling point below 100°C. the solvent with a concentration of from 66 to 98 wt.% interaction:
a) one or more polyisocyanates,
b) one or more polyols with an average molecular mass Mnfrom 500 to 6000,
c) one or more polyols with an average molecular mass Mnfrom 62 to 500,
d) one or more compounds containing an ionic group or capable of forming ionic groups and NCO-prepolymer free from nonionic hydrophilizing tools;
I.2) in the second stage NCO-prepolymer 1.1) is dispersed in water, and before, during or after dispersion provide at least partial neutralization of the ionic groups;
I.3) in the third stage, carry out chain elongation by
e) one or more polyamines with an average molecular mass Mnbelow 500; and
I.4) in the fourth stage completely remove the solvent by distillation and finally
add together or separately in the polyurethane dispersion (I);
III) other additives for lacquers.

2. Water means for applying the coatings obtained according to claim 1.

3. Water means for coating according to claim 2, wherein the polyurethane dispersion has a content of hard segments between 50 and 85 wt.%, the amount of isocyanate in the calculation of the solid substance is between 35 and 55 wt.%.

4. Water means for coating according to claim 2, characterized in that the acid number of the solid resin is between 12 and 30 mg KOH/g solid resin.

5. Water means for coating according to claim 2, characterized in that the polyol (b) used in combination with fatty acid polyester b1).

6. Water means for coating according to claim 5, characterized in that the components b1) are srednestatisticheski bifunctional relative to the Oh-group containing fatty acid components having links glycerol or trimethylolpropane.

7. Water means for coating according to claim 5, characterized in that the components b1) are the product of interaction with the average IT-functionality 2 castor oil with another oil that is different from castor oil.

8. Water means for coating according to claim 5, characterized in that the polyols have a molecular mass Mnfrom 650 to 2500 g/mol, IT is the functionality from 1,92 up to 2 and are selected from uppy: ester, simple ether, carbonates or overcarbonation.

9. Water means for coating according to claim 2, characterized in that the components (II) are onomatology ether ethylglycol, monobutyl ether ethylglycol, butyldiglycol, onomatology ether of propylene glycol or monobutyl ether of propylene glycol.

10. The use of water resources for coating according to claim 2 as a binder in one-component (1K)systems.

11. The use of water resources for coating according to claim 2 as a binder in a two-component (2K)system.

12. The use of water resources for coating according to claim 2 to produce coatings on absorbent substrates.

13. The application of item 12, wherein the absorbent substrates are wood or mineral substrate with open porosity.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: present invention relates to a polyurethane dispersing resin, primarily having a polyurethane chain which contains hydrophilic groups of the side chain based on polyalkylene oxide, where groups of the side chain are covalently bonded to the polyurethane backbone chain, and where content of polyalkylene oxide in the polyurethane dispersing resin is at least 45 wt % and not more than 80 wt %. Polyurethane also contains hydrophobic groups on the side chain, which are covalently bonded to the polyurethane backbone chain. The invention also describes a coating composition containing said polyurethane dispersing resin, methods of preparing said composition and use of the polyurethane dispersing resin to prepare a composition for mixing with a pigment.

EFFECT: providing a polyurethane dispersing resin which enables to prepare concentrates of pigments, which can be easily included in a coating composition, in which pigments are stably dispersed, as well as possibility of obtaining pigment compositions with a wide range of pigments and obtaining dyes having excellent properties and stability, especially hard-to-disperse and stabilised pigments.

24 cl, 16 ex, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a coating composition containing a) polyacrylate polyol obtained via polymerisation of unsaturated olefin monomers, where at least 40 wt % of the monomers include straight or branched alk(en)yl or alk(en)ylene groups, having at least 4 carbon atoms; b) polyether polyol obtained via esterification of component links having functional groups which form an ester, where at least 30 wt % of component links include straight or branched alk(en)yl or alk(en)ylene groups with at least 4 carbon atoms per functional group, which forms an ester, where he polyether polyol has hydroxyl number higher than 280 mg KOH/g and hydroxyl functionality of at least 2, and c) isocyanate-functionalised cross-linking agent. The invention also relates to a set of parts for preparing the coating composition and a method of applying the coating composition. The coating composition can be used as a top coating layer in multilayer paint coats, in finishing or reworking automobiles or large vehicles.

EFFECT: coating has high hardness, scratch resistance, lustre, longevity and wear resistance, chemical resistance and UV radiation resistance.

15 cl, 6 tbl

FIELD: chemistry.

SUBSTANCE: composition includes a polymer mixture which contains a) an aqueous dispersion of at least one polysiloxane and b) an aqueous dispersion of at least one polyurethane, in which content of the said at least one polysiloxane polymer varies from approximately 50 to 85 wt %, and content of the said at least one polyurethane varies from approximately 15 to 50 wt %, in terms of total weight of solid substances of the said at least one polysiloxane polymer and the said at least one polyurethane and c) polyolefin powder with ultrahigh molecular weight in amount of approximately 5-35 pts. wt per 100 total parts by weight of the said at least one or more polysiloxanes and the said one or more polyurethanes. The said polyurethane is obtained from at least one aliphatic or cycloaliphatic diisocyanate and at least one hydroxyl ending intermediate compound such as polycarbonate, polyester or polyether or combination thereof, and is heat-curable. The said aqueous dispersion contains approximately 7 wt % or less of an organic solvent in terms of total weight of the said dispersion composition, and the said polymer mixture contains from approximately less than 10 to 0 parts by weight of a substance for increasing adhesiveness per 100 total parts by weight of the said at least one polyurethane and the said at least one polysiloxane; and contains from approximately less than 10 to 0 parts by weight of a halogen-containing polymer per 100 total parts by weight of the said at least one polyurethane and the said at least one polysiloxane. The invention also describes versions of a polymer or rubber substrate and versions of a sealant for vehicles, at least partially coated with the dried composition described above.

EFFECT: low noise level when substrate coated with the said composition moves or is in contact with an article, as well as obtaining a surface with low coefficient of friction which does not increase with time.

17 cl, 14 ex, 10 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: polyurethane material contains a first part of crystalline particles, having self-orientation and bonded so as to keep their orientation along a first crystallographic line at least in two directions, a second part of crystalline particles having self-orientation and bonded so as to keep their orientation along a second crystallographic line at least in two directions, wherein the first crystallographic line is different from the second crystallographic line and where the said crystalline particles constitute more than approximately 30% of the total volume of the polyurethane material, and where the polyurethane contains a product of reaction of components comprising: (a) approximately 1 equivalent of 4,4'-methylene-bis(cyclohexylisocyanate); (b) approximately 0.3 of a trimethylolpropane equivalent; and (c) approximately 0.7 of a butanediol or pentanediol equivalent, and where the polyurethane material undergoes thermal treatment at temperature ranging from approximately 35°C to approximately 150°C or holding.

EFFECT: production of polyurethane material, products of which are made through casting or reaction injection moulding and have good optical properties, high resistance to impact loads, high impact resistance, high K-ratio, good ballistic stability, good resistance to solvents and good weather resistance.

26 cl, 110 ex, 33 tbl, 26 dwg

FIELD: chemistry.

SUBSTANCE: disclosed is an aqueous polyurethane dispersion which does not contain N-methylpyrrolidone and solvents and contains a product of reaction of a mixture of 1-isocyanate-3,3,5-trimethyl-5-isocyanatemethylcyclohexane and 4,4'-diisocyanatedicyclohexylmethane, one or more polyols with average molecular weight of 500-3000, one or more compounds with at least one OH- or NH- functional group, which contain a carboxyl and/or carboxylate group, where at least 50 mol % acid incorporated in the overall resin consists of dimethylol propionic acid, one or more polyols and/or polyamines with average molecular weight less than 500 and, if necessary, one or more monoalcohols and/or monoamines, as well as preparation method thereof and use thereof as an agent for coatings having good resistance characteristics.

EFFECT: obtaining a polyurethane dispersion which does not contain N-methylpyrrolidone and solvents, and contains a hydrophilization agent in form of dimethylol propionic acid, which can be stored for over 8 weeks and is suitable for making transparent shining coatings with high resistance to dyes.

8 cl, 2 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to aqueous coating compositions with low content of volatile organic compounds. The aqueous coating composition contains water, oxidative-curable resin, at least 1.5% of the weight of the composition of a non-structured alkali-soluble acrylate, having weight-average molecular weight Mw of 200000 g/mol or lower, and acid number of at least 15 mg KOH/g; and an emulsified second acrylate having Mw of at least 300000 g/mol. Content of the alkali-soluble acrylate in the composition is equal to at least 3 wt %. The weight ratio of the alkali-soluble acrylate to the second emulsified acrylate ranges from 1:0.5 to 1:5, and the weight ratio of the alkali-soluble acrylate to the oxidative-curable resin ranges from 1:0.5 to 1:10. The oxidative curable resin is an alkyd resin, alkyd-urethane resin. The second acrylate is cross-linkable, for example azomethine cross-linkable links.

EFFECT: aqueous coating composition has good physical and mechanical properties.

9 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polyurethanes and articles made from said polyurethanes, as well as to laminated material and coating composition containing such polyurethanes. The polyurethane is a product of a reaction between components which contains less than approximately 10 wt % polyesterpolyol and/or polyetherpolyol, where the components are selected from: (a) approximately 1 equivalent of at least one polyisocyanate; (b) approximately 0.05-0.9 equivalent of at least one branched polyol which contains 3-18 carbon atoms and at least 3 hydroxyl groups; and (c) approximately 0.1-0.95 equivalent of at least one diol which contains 2-18 carbon atoms, where during mixing, the reaction components are held at reaction temperature of at least approximately 100°C for at least approximately 10 minutes.

EFFECT: production of polyurethanes, articles of which are made through casting or reaction injection moulding and have good optical properties, high resistance to impact loads, high impact resistance, high K-ratio, good ballistic stability, good resistance to solvents and good weather resistance.

37 cl, 113 ex, 82 tbl, 26 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a moisture-curable composition for adhesive compounds, sealing compounds, coatings or linings, application thereof as an adhesive, sealing compound or coating, a cured composition obtained by reacting water with such a composition, methods of gluing bases and sealing using said composition, as well as adhesive and sealed articles made using said methods, respectively. The moisture-curable composition contains (i) at least one isocyanate-containing polyurethane polymer P, which is obtained from at least one polyisocyanate and at least one polyol, and (ii) at least one aldimine-containing compound of formula (I): .

EFFECT: preparation of compounds which are stable during storage, can be quickly moisture-cured without bubbles, do not cause smells during curing and are suitable for use as precursors of synthetic materials.

25 cl, 34 ex, 10 tbl

FIELD: medicine, pharmaceutics.

SUBSTANCE: invention relates to coating composition, applied, for instance, as transparent coatings, base coatings, pigmented coating layers, used, prime coatings, etc. Composition contains polyisocyanate, polyol, metal-based catalyst for carrying out reaction of addition reaction between isocyanate groups and hydroxyl groups, thiol-functioning compound and carboxylic acid, carbonyl group of carboxylic acid being in connection with π-electronic system.

EFFECT: creation of novel coating composition, demonstrating presence of favourable property balance, namely, low level of volatile organic solvent content with operation viscosity, high rate of hardening and long viability, which results in obtaining coatings, which demonstrate good outlook characteristics, in particular, low liability to formation of pinholes, and good hardness.

14 cl, 2 tbl

FIELD: construction.

SUBSTANCE: composition for coats contains isocyanate prepolymer produced by interaction of 4,4'-diphenylmethanediisocyanate and oligodiendiol with molecular weight of 2800-3200, content of hydroxyl groups 0.88-1.3% at the ratio of isolcyanate and hydroxyl groups of 4:1 with content of isocyanate groups in prepolymer of 8.0-9.7%, wt parts - 15-70, base - rubber composition from low-molecular hydroxyl-containing rubber, plasticiser, filler, anti-ageing agent and pigment - 100, catalyst of urethane production - 0.05-0.15 and glycerin 0.7-3.0.

EFFECT: higher strength, hardness and relative extension of coats.

2 tbl

FIELD: chemistry.

SUBSTANCE: disclosed is an aqueous polyurethane dispersion which does not contain N-methylpyrrolidone and solvents and contains a product of reaction of a mixture of 1-isocyanate-3,3,5-trimethyl-5-isocyanatemethylcyclohexane and 4,4'-diisocyanatedicyclohexylmethane, one or more polyols with average molecular weight of 500-3000, one or more compounds with at least one OH- or NH- functional group, which contain a carboxyl and/or carboxylate group, where at least 50 mol % acid incorporated in the overall resin consists of dimethylol propionic acid, one or more polyols and/or polyamines with average molecular weight less than 500 and, if necessary, one or more monoalcohols and/or monoamines, as well as preparation method thereof and use thereof as an agent for coatings having good resistance characteristics.

EFFECT: obtaining a polyurethane dispersion which does not contain N-methylpyrrolidone and solvents, and contains a hydrophilization agent in form of dimethylol propionic acid, which can be stored for over 8 weeks and is suitable for making transparent shining coatings with high resistance to dyes.

8 cl, 2 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing biologically compatible gel which is thickened with cross-linked polymer by cross-linking a given amount of at least one biologically compatible natural polymer in a solution by adding a defined amount of cross-linking agent, an additional amount of polymer with molecular weight over 500000 dalton in a solution, in which the reaction mixture is diluted to reduce concentration of polymer in the solution, and the cross-linking reaction is stopped by removing the cross-linking agent.

EFFECT: gel and its use for separating, replacing or filling biological tissue or for increasing volume of such tissue, or supplementing or replacing biological fluid.

11 cl, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: thermoplastic gel composition which can be cured under the action of radiation includes: (a) approximately from 5 to 40 wt % of cured block-copolymer selected from the group consisting from compounds of formula (II) or (III) or (IV), whereat A is vinyl aromatic hydrocarbon block with molecular mass from 4000 to 30000, HD is hydrogenated conjugated diene block with molecular mass from 10000 to 100000, Y is multifunctional binding agent, UD is conjugated diene block with molecular mass from 1000 to 80000 or conjugated diene block with molecular mass from 1000 to 80000 which is partially hydrogenated, x is integer number from 1 to 20, y is equal to 0 or 1, z is integer number from 1 to 20 and in the formulas (II) and (III) the sum (x+z) is in the range from 2 to 30; (b) from 60 to 90 wt % of the liquid component selected from the filling oils, plasticisers and solvents compatible with the curable copolymer; (c) from 1 to 20 wt % at least one curative agent selected from bifunctional or multifunctional acrylate or metaacrylate monomers or vinyl ethers; d) optionally from 0 to 10 wt % of the expanding microspheres; and (e) optionally from 0 to 3 wt % of the photoinitiator whereat total component amount is equal 100 wt %. The thermoreactive article containing the thermoplastic gel composition subjected to the action of radiation is described as well as the thermoplastic gel composition which can be cured under the action of radiation and includes: (a) from 5 to 40 % w/w of the mixture of curable block-copolymer with formula (I) whereat S is polystyrol block, B is polybutadiene polymer block having the content of 1,2-vinyl groups in the range from 10 to 80 mole %, Y is the radical of the binding agent, x is integer number from 1 to 20, preferably 2, y - integer number from 0 to 20, preferably 2, with sum (x+y) being in the range from 2 to 30; and block-copolymer of the (polystyrol -hydrogenated polybutadiene -polystyrol ) type with ratio (block-copolymer of formula (I): (block-copolymer of (polystyrol -hydrogenated polybutadiene -polystyrol ) type being in the range from 3:1 to 1:3; (b) from 60 to 90 wt % of the liquid component selected from the filling oils, plasticisers and solvents compatible with the curable copolymer; (c) from 1 to 20 wt % of at least one curative agent selected from bifunctional or multifunctional acrylate or metaacrylate monomers or vinyl ethers; (d) from 0.1 to 10 wt % of expanding microspheres; and (e) from 0 to 3 wt % of photoinitiator whereat total component amount is equal 100 wt %.

EFFECT: increase of high-temperature shrinkage resistance.

10 cl, 8 tbl, 30 ex

FIELD: molecular biology, bio-organic chemistry, possible use for producing cellular microchips.

SUBSTANCE: in accordance to suggested method for forming alginate gel with its simultaneous holding on the surface of solid phase, alginate gel is formed on the surface of solid phase which contains metal oxide with free valences, in presence of polyamine connection. Current method is used in the method for producing a cellular microchip. Cellular microchip is produced by forming and holding micro-cells of gel, containing immobilized cells, on the surface of the solid phase.

EFFECT: possible production of alginate gel, reliably held on the surface of solid phase.

3 cl, 1 tbl, ex

Abstract // 2293061

FIELD: ION-EXCHANGE MATERIALS.

SUBSTANCE: invention relates to a process of preparing gel-like cationites for use in treatment and purification processes. Gel-like cationites are prepared by inoculating-incoming process wherein (a) aqueous suspension of microcapsulated cross-linked styrene polymer in the form of granules and containing cross-linking agent is provided as inoculating polymer; (b) inoculating polymer is left to swell in monomer mixture composed of vinyl monomer, cross-linking agent, and radical initiator, namely peracid aliphatic ester; (c) monomer mixture is polymerized in inoculating polymer; and (d)resulting copolymer is functionalized via sulfatization. Process is characterized by that, in step (a), content of cross-linking agent in cross-linked styrene copolymer amounts to 3.5-7 wt % and inoculum-to-income ratio in step (b) amounts to 1:(0.25-1.5).

EFFECT: enabled preparation of gel-like cationites having high osmotic and mechanic stabilities as well as improved oxidation resistance.

7 cl, 9 tbl, 9 ex

FIELD: polymer production.

SUBSTANCE: invention aims at purifying thermally processed tetrafluoroethylene copolymers so that the latter acquire high optical properties. Method of invention resides in that polymeric latex of thermally processed tetrafluoroethylene copolymers prepared via polymerization in dispersion or in water emulsion is converted into gel form by adding, at mechanical stirring, acid electrolyte to achieve pH of medium below 2 and, after which polymeric gel is washed with acidic aqueous solutions or neutral solutions within a pH range between 1 and 7.

EFFECT: increased purification efficiency.

18 cl, 3 tbl, 6 ex

FIELD: production of filled gel-like composition with viscoelastic properties.

SUBSTANCE: claimed composition contains (vol.pts): 0.5-2.0 mass % sodium tetraborate aqueous solution 1-2; 1.0-8.0 mass % polyvinyl alcohol aqueous solution 1-5; 1.0-8.0 mass % carboxymethyl cellulose aqueous solution 1-5 or 1.0-8.0 mass % polyacrylamide aqueous solution 1-2; and filler 1-3. Composition has dynamic viscosity of 642-2467.87 mPa.s; elasticity modulus of 61.12-81.12 N/m2, and adhesion of 53.76-86.79 N/m2. As filler sand with particle size of 0.23-0.5 mm; lavsan or propylene fiber of 70-100 mum in diameter and filament length of 3-6 cm, or Teflon granule at most 1 mm in diameter. Composition of present invention is useful in production of petroleum industry, oil line purification, as anticorrosion, biocide and wear resistant coatings.

EFFECT: new viscoelastic composition of improved quality.

FIELD: polymer materials.

SUBSTANCE: invention, in particular, relates to hydrophobically modified water-soluble polymers or complexes of the latter with surfactants and discloses a method for selectively inhibiting gelation of hydrophobically associating gel-forming liquid containing hydrophobically associating water-soluble polymers or complexes of the latter with surfactants. Advantage of invention resides in that, when thus inhibited liquid contacts with a hydrocarbon medium, inhibitory effect is preserved and gelation does not occur and, when liquid contacts with an aqueous medium, inhibitory effect is cancelled and gelation takes place. Inhibitor is selected such that it is well soluble in aqueous media but insoluble in hydrocarbon media, for example ethanol or methanol. Hydrophobically associating substance in associating gel-forming liquid is, in particular, hydrophobically modified water-soluble polymer based on polyacrylamide containing 84.4 or 88.8 mol % acrylamide units, 1.5 mol % n-dodecylacrylamide units, and 14.1 or 9.7 mol % sodium acrylate units. Surfactant used in polymer complexes is, in particular, cetylpyridinium chloride. Invention further discloses associating gel-forming liquid containing 1 to 10% by weight of hydrophobically associating substances and also composition for treating oil well, which comprises associating liquid. Disclosed is also a method for selectively blocking water entry into producing oil well from underground water-bearing formations. Invention can thus be used in oil production to control water inflows in oil-production well allowing restriction of water entry into well without unfavorably affecting oil production process.

EFFECT: facilitated gelation control in polymer-containing liquids.

4 cl, 2 dwg, 1 tbl

FIELD: chemical compositions, polymers.

SUBSTANCE: invention relates to aqueous compositions comprising particles of chemically cross-linked water-soluble or water-dispersed chemical microgel. Invention proposes an aqueous composition comprising particles of chemically cross-linked water-soluble or water-dispersed chemical microgel bound with at least one bridge water-soluble or water-dispersed polymer wherein its chemical composition differs from chemical composition of indicated particles. The amount of chemical microgel particles is from 0.05 to 40% dry mass of the composition mass, and the amount of bridge polymer provides exceeding the viscosity value of the composition by at least three times or preferably it exceeds or equal to 10-fold viscosity value of chemical microgel particles an aqueous solution, and exceeds viscosity value of the bridge polymer an aqueous solution under the same conditions. Also, invention proposes a method for preparing of the claimed an aqueous composition. Proposed composition can be used in the field for mining petroleum and gas deposits, and in manufacturing detergents and cosmetics also. Invention provides enhancing stability of the composition.

EFFECT: improved and valuable properties of composition.

25 cl, 2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: method of preparing controlled-size microgels, which can be used in oil and gas wells to prevent water inflow, consists in introducing polymer and suitable crosslinking agent into porous and permeable medium. Passage and passage velocity of polymer and crosslinking agent are controlled such as to provide crosslinking of polymer to form microgel aggregates in porous and permeable medium and to control sizes of aggregates leaving this medium. Removed solution contains microgel aggregates essentially equal in size.

EFFECT: achieved effective size control microgel aggregates.

11 cl

The invention relates to the production of thermoplastic poliuretanowy in fine form, which can be used for the manufacture of coating film materials, artificial leather, adhesives, binders, adhesives, construction materials, as well as modifying additives to other polymers
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