RU2109785C1 - An aqueous-dispersion dye - Google Patents

Abstract

FIELD: paint and varnish industry. SUBSTANCE: an aqueous-dispersion dye has, wt.-%: latex of copolymer of butadiene and vinylidene chloride, 30-35; water glass, 2.0-3.5; natural chalk, 22-25; titanium white, 5.0-8.0; aerosil, 0.4-0.7; carboxymethylcellulose sodium salt, 0.4-0.5; casein, 0.4-0.6; disperser, 0.6-0.7; household soap, 0.1-0.17; and water, the balance. Proposed dye can be used in building industry. EFFECT: improved quality of dye. 2 tbl

Description

 The invention relates to paints and varnishes, in particular to water-dispersion compositions for interior and exterior painting of buildings and structures on brick, concrete plastered, wood and other porous surfaces (except floors), on a primed metal surface, for painting fruit, ornamental trees, shrubs in order to increase their winter hardiness.

 For finishing works, a large number of various water-dispersed compositions are used, which are suspensions of pigments and fillers in aqueous dispersions of synthetic polymers with the addition of various auxiliary substances (emulsifier, stabilizer, etc.) [1].

 These paints have a number of disadvantages, poor hiding power, and a long drying time.

 The closest in technical essence and the achieved result to the claimed invention is a paint, which includes styrene butadiene latex [2].

The composition of the known paint is as follows, wt.%:
Styrene butadiene latex - 20 - 32
Enriched natural chalk - 8 - 20
Urea-formaldehyde resin - 1.5 - 2.0
White Spirit - 4 - 5
Zinc white - 3 - 8
Diatomaceous powder - 9 - 25
Liquid glass - 6 - 8
Water - Else
The disadvantages of this composition are the use of expensive butadiene styrene latex as a film-forming agent, expensive and deficient urea-formaldehyde resin, poor hiding power, a large washout index, and a long drying time as an antifreeze (an additive for paint stability in frosty times).

 The technical task of the invention is to exclude expensive and scarce butadiene styrene latex and antifreeze from the paint composition, increase hiding power, reduce paint drying time.

 The technical result is achieved by the fact that DVHB-70 latex (which is an aqueous dispersion of a copolymer of butadiene and vinylidene chloride) is used as a film-forming paint, which is more affordable and cheaper. ), providing quick wetting and dispersing of powders, as well as the necessary fineness of grinding chemicals, the paint formulation is selected so that the paint has a frost-resistant tvam without the use of expensive and scarce antifreeze.

The composition of the paint is the following, wt.%:
Dry latex DVHB-70 - 30 - 35
Liquid glass - 2 - 3,5
Glue CMC - 0.4 - 0.5
Casein - 0.4 - 0.6
Dispersant NF - 0.6 - 0.7
White Titanium - 5 - 8
Chalk (natural) - 22 - 25
Laundry soap (48%) - 0.1 - 0.17
Aerosil-175 - 0.4 - 0.7
Comparative analysis with the prototype allows us to conclude that new components are introduced into the paint, namely: DVHB-70 latex as a film-forming agent, NF dispersant (a product of the condensation of sulfonic acid with formalin), which provides quick wetting and dispersion of powders, as well as the necessary fineness of grinding of chemicals, ammonium caseint solution (10%), which is a good thickener of latex DVHB-70, as well as a protective colloid that protects the latex from coagulation.

 Analysis of the known compositions of paints used for interior and exterior use showed that many substances introduced into the claimed solution are known, for example: water glass, glue, titanium white. However, their use in these paints in combination with other components does not provide the paints with the properties that they exhibit in the claimed solution, namely, the hiding power, washability index and the drying time of the paint are significantly improved.

 The formulation is selected in such a way that the paint has frost-resistant properties without the use of expensive and scarce antifreeze, and the cost of the paint is significantly reduced.

 Thus, this composition of the components gives the paint new properties, which allows us to conclude that the proposed solution meets the criterion of "significant differences".

 For experimental verification of the claimed composition of the paint from various batches of raw materials, 50 mixtures were prepared according to 9 formulations (Table 1 - 2), three of which (N7 N8 N9) showed optimal results.

 The composition is prepared as follows. The whole technological process is divided into three stages: preparation of a dispersion of pigment, filler; preparing a thickened latex mixture; preparation of water dispersion paint.

 1st stage.

 A weighed portion of water is introduced into the wetter with mechanical stirring (800 - 900 rpm), stirring is turned on, the weighed portion of the NF dispersant is poured, the resulting aqueous phase is mixed until the dispersant is completely dissolved. A suspension of Aerosil-175 (anti-precipitant) is introduced into the obtained aqueous solution of the NF dispersant. The mixture is mixed until the aerosil is completely wetted. Then a sample of titanium white and natural chalk is introduced. The mixture is mixed until the powders are completely wetted, then through a filter (metal mesh N 1) the mixture is fed into a bead mill, where the pigment and filler particles are ground to the desired particle size. Then the finished dispersion is poured into an intermediate tank with mechanical stirring (40 rpm), where it is averaged and stored.

 2 stage.

 A latex suspension, including mixing, is poured into the reactor with mechanical stirring (40 rpm). A hinge of liquid glass is poured. The resulting mixture is mixed until liquid glass is fully introduced into the latex, then thickeners are poured, protective colloids - CMC glue solution (1:10), 10% solution of ammonium caseinate. The resulting latex mixture is mixed until the protective colloids are fully incorporated into the latex.

3 stage
A dispersion is introduced into the thickened latex mixture. The resulting composition is mixed until one mass is obtained. Finished paint before packaging is filtered through a metal sieve N 2.

Bibliography:
1. GOST 20833-75, GOST 19214-80.

 2. Copyright certificate 1432079, cl. C 09 D 5/02 (prototype).

Claims (1)

Water-dispersion paint, including synthetic polymer latex, water glass, natural chalk, pigment, filler, and water, characterized in that it contains a butadiene-vinylidene chloride copolymer latex of the DVHB-70 brand as a synthetic latex, and titanium white as a pigment, as a filler - Aerosil-175 and optionally sodium carboxymethyl cellulose, casein, dispersant "NF" based on naphthalene sulfonic acid and laundry soap in the following ratio of components, wt. %:
Latex copolymer of butadiene and vinylidene chloride brand DVHB-70 - 30 - 35
in terms of dry matter
Liquid glass - 2.0 - 3.5
Natural chalk - 22.0 - 25.0
White titanium - 5.0 - 8.0
Aerosil 175 - 0.4 - 0.7
Carboxymethyl cellulose sodium salt - 0.4 - 0.5
Casein - 0.4 - 0.6
Dispersant "NF" based on naphthalene sulfonic acid - 0.6 - 0.7
Laundry soap (48% aqueous solution) - 0.1 - 0.17
Water - Rest

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