Water dispersion composition

 

(57) Abstract:

The invention relates to the technology of paint and varnish materials, particularly to a water-dispersible compositions of wide application. Describes a water-dispersible composition that includes an aqueous dispersion of polyvinyl acetate, a solution of isoprene rubber in nerase or white-spirit, chalk natural powder, zinc, sodium carboxymethyl cellulose, Aerosil, ethoxylated alkylolamides, polyvinyl alcohol and water. Additionally, it contains an additive in the form of soluble salts of chitosan, chosen from a number of hydrochloride, chitosan, chitosan sulfate, formate, chitosan with a ratio of components, wt.%: aqueous dispersion of polyvinyl acetate 1,0-30,0, the solution of isoprene rubber in nerase or white-spirit 8,0, chalk natural powder 15,0, zinc 20,0, sodium carboxymethyl cellulose 1.5 to 2:0, Aerosil 0,05-0,50, ethoxylated alkylolamides 0:2, the polyvinyl alcohol of 0.5, a water-soluble salt of chitosan from 0.01 to 1.00, water - the rest. The technical result is an increase in water resistance and resistance to fungal microflora. table 2.

The invention relates to the technology of paint and varnish materials, and specifically to water-the second suspension of pigments and fillers in aqueous dispersions of synthetic polymers with the addition of various excipients - dispersants, emulsifiers, stabilizers, thickeners, defoamers, antiseptics, corrosion inhibitors, and various additives, hydrophobic, structuring, cholesterolic etc.

Such compositions are intended for interior and exterior painting of buildings and structures of brick, concrete, wood and other porous surfaces. Coatings based on water-dispersed compositions must possess the necessary moisture and weather resistance as well as resistance to the formation of fungal microflora. These figures are extremely important because it largely determines the consumer properties of the paint.

To ensure the necessary levels of water resistance, for example polyvinyl acetate coatings are widely used polyvinyl alcohol, which form insoluble compounds in the presence of urea-formaldehyde resin. Resistance to microorganisms and the formation on the surfaces of the mold is achieved by the use of antiseptics, such as pentachlorophenol sodium, etc. /Livshits, M. L., Przyjalkowski B. L. Paintwork materials: the Handbook. - M.: Chemistry, 1982, S. 315 /.

However, carbamidomethylated the status of the person.

The closest analogue of the proposed composition is known, water - dispersion paint VA-224, manufactured according to GOST 28196-89. "Paints are water-based. Technical conditions" in the Regional state unitary enterprise "Biysk paint plant".

In the paint composition includes, by weight.%:

Aqueous dispersion of polymer (dispersion of polyvinyl acetate GOST 9808-84) - 1,0-30,0

Oligomeric binder (liquid isoprene rubber SKI-3H TOO.103241-90 in nerase or white-spirit) - 8,0

Filler (chalk natural powder brands MM-1; MM-2 OST 21-10-88) - 15,0

Pigment (zinc white GOST 202-84) - 20,0

Thickener (sodium carboxymethyl cellulose THAT 6-55-40-90 - 1,5-2,0

Water-repelling additive (urea-formaldehyde resin K-412-01 TU 6-10-1494-80) - 2,0

Structuring additive (Aerosil GOST 14992-87) - 0,05 - 0,50

Surfactants (ethoxylated alkylamine "sintimid -5" TU 6-02-640-80) - 0,2

Dispersant (polyvinyl alcohol GOST 10779-78) - 0,5

Water - the Rest

The song has a high resistance and substantially exposed to fungal microflora. In addition, it does not meet the requirements of environmental safety, because it contains in its composition are micro-grain tungsten paint and its protection from the damaging effects of microorganisms.

The problem is solved due to the fact that water-dispersed composition comprising an aqueous dispersion of polyvinyl acetate, a solution of isoprene rubber in nerase or white-spirit, chalk natural powder, zinc, sodium carboxymethyl cellulose, Aerosil, ethoxylated alkylolamides, polyvinyl alcohol and water, additionally contains an additive that improves the moisture resistance and resistance to fungal microflora in the form of soluble salts of chitosan selected from the range: hydrochloride, chitosan, chitosan sulfate, formate, chitosan in the following ratio, wt.%:

Aqueous dispersion of a polyvinyl acetate - 1,0 - 30,0

A solution of isoprene rubber in nerase or white-spirit - 8,0

Chalk natural powder - 15,0

Zinc white - 20,0

Sodium carboxymethyl cellulose - 1,5-2,0

Aerosil - 0,05 - 0,50

Ethoxylated alkylolamides - 0,2

The polyvinyl alcohol - 0,5

Water-soluble salt of chitosan - 0,01 - 1,00

Water - the Rest

Chitosan or poly [(1-4)-2-amino-2-deoxy-D-glucose] - product deep processing of crustaceous materials (crabs, shrimps, and so on) produced according to TU 6-09-05-397-75. Is a homogeneous powder Belov water. Chitosan is a natural biopolymer that is widely used in medicine, cosmetics, food industry and agriculture. Has a high resistance, specific bactericidal activity. The material is non-toxic. Values LD50for chitosan is at the level of LD50for sucrose or sodium chloride (J. Knapczyk Applications of chitosans in the dosage forms of druds.// Polim. med.l988. V18. N 3. P. 178). Chitosan and its derivatives do not have any irritation or allergic effects on people.

The water-soluble salts of chitosan (chitosan hydrochloride, chitosan sulfate, formate, chitosan) are fine powders from white to light gray. As the base material, they have a high moisture resistance and antibacterial activity. Well soluble in water.

Comparison of the proposed technical solution with the closest analogue shows that it differs from the latter in the introduction to the recipe of the famous water-dispersed composition of the new component is a water - soluble salt of chitosan, i.e., this solution meets the criterion of "novelty".

In the technique known application of chitosan and its water-soluble salts in the formulations of protovol the dispersion compositions. The proposed formulation of water-dispersion paints includes such a set of initial components and their quantitative ratios, which allow to obtain compositions with improved performance in water resistance and resistance to fungal microflora, while ensuring environmental safety requirements.

The beneficial effect of the investigated water-soluble salts of chitosan in the formulation of the inventive water-dispersed composition is almost the same. The choice of a particular salt is dictated primarily by the specific terms of technology and the availability of adequate raw material base.

The range of changes in concentrations of water-soluble salts of chitosan in the composition is primarily due to the following factors.

When the concentration of the water-soluble salts of chitosan less than 0.01 wt.% not marked increase moisture resistance and fungicidal activity in comparison with a water-dispersible composition BA-224.

At concentrations of more than 1.00 wt. % significantly increases the viscosity of the ink, exceeding technologically acceptable values, which affects its consumer properties.

Next, the aqueous paste is processed in a bead mill and fed into the mixer, which download the aqueous dispersion of polyvinyl acetate and a solution of isoprene rubber SKI-3H in nerase or white-spirit. After stirring the prepared ink is supplied to the filling machine for filling containers.

The composition is applied on the surface of the conventional methods: brush, roller and spray. In table.2 presents the test results of the inventive compositions in comparison with the known.

Thus, the proposed water-dispersed composition claimed in her set of features allows to achieve the required technical result is to increase the water resistance of the paint and protects it from the damaging effects of microorganisms.

The composition directly from the prior art in this field is not in the public affect the solution of the problem. This gives the basis to consider this solution as inventive.

The compositions can be obtained by standard manufacturing techniques of water-dispersion paints, using commercially available materials and standard equipment.

Thus, the claimed technical solution has industrial applicability.

Water-dispersed composition comprising an aqueous dispersion of polyvinyl acetate, a solution of isoprene rubber in nerase or white-spirit, chalk natural powder, zinc, sodium carboxymethyl cellulose, Aerosil, ethoxylated alkylolamides, alcohol palinology and water, characterized in that it further contains an additive that improves the moisture resistance and resistance to fungal microflora in the form of soluble salts of chitosan selected from the range: hydrochloride, chitosan, chitosan sulfate, formate, chitosan in the following ratio, wt.%:

Aqueous dispersion of a polyvinyl acetate - 1,0 - 30,0

A solution of isoprene rubber in nerase or white-spirit - 8,0

Chalk natural powder - 15,0

Zinc white - 20,0

Sodium salt of carboxyl the - 0,5

Water-soluble salt of chitosan - 0,01 - 1,00

Water - The Rest

 

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