The ground-enamel waterborne anticorrosive series "Êronakril"

 

The invention relates to paints, varnishes and lacquers, namely priming water-dispersed compositions intended for the protection against corrosion of metal surfaces, operated in atmospheric conditions and exposed to various liquids. Can be used as a primary primer, as well as independent paint. The composition includes an acrylic dispersion, tinting paste, dispersant, thickener and water, and as anti-corrosion pigment crowns of calcium phosphate. The use of the crown of calcium phosphate in the soil enamel provides a unique piscivorous activity in interaction phosphatisation with the metal substrate of ferrous and non-ferrous metals, providing cathodic and anodic protection. table 1.

The invention relates to paints, varnishes and lacquers, namely priming water-dispersed compositions intended for the protection against corrosion of metal surfaces, operated in atmospheric conditions and exposed to various liquids. Can be used as a primary primer, as well as independent paint.

From the private latex, surfactant, phosphoric acid, acetylcellulose, polyphosphate of sodium and water [USSR Author's certificate 10044302, MKI C 09 D 5/02, 1980].

The disadvantage of this composition is a low film strength and low corrosion properties of the coating.

Closest to the claimed invention and taken as a prototype is a water-based primer comprising a latex of butadiene-styrene copolymer, phosphoric acid, cancellativity pigment, surfactant, red iron oxide pigment, acetylcellulose, polyphosphate of sodium and water [RF Patent 2063409, IPC 6 C 09 D 109/08, publ. 10.07.96].

This primer has increased (compared to 1004432) mechanical strength and a few high anti-corrosion properties when exposed to water due to the additional introduction of the composition to orthophosphoric acid circulationaha pigment.

However, primer such composition has a low resistance to mineral oils, alkalis, NaCl, gasoline and other solvents.

Object of the present invention is to provide a water-based primer-enamel with high resistance to static action of balestriere industries.

The invention consists in the use as an anticorrosive pigment, instead of orthophosphoric acid and circulationaha pigment, crown of calcium phosphate - anti-corrosive pigment according to the patent of the Russian Federation 2151157.

The technical result of the use of the crown of calcium phosphate in aqueous dispersion primer-enamel is the formation on the substrate photogrametry film under the influence of corrosive environment, which causes passivation of the metal surface and, thus, has an additional protective effect.

Thus, the use of the crown of calcium phosphate in the soil enamel provides a unique piscivorous activity in interaction phosphatisation with the metal substrate of ferrous and non-ferrous metals, providing cathodic and anodic protection.

The ground-enamel, as a prototype, and claimed, consists mainly of a binder, anti-corrosive pigment, tinting pastes, dispersant and thickener, the rest is water, which is used as a solvent.

In the prototype as a binder is used, the latex of butadiene-styrene copolymer, the present invention features use up to 70%), acrylic or methacrylic acid (and correspondingly from 70 to 30%), which improves the firmness and elasticity of the coating. Its quantitative content in the composition of the primer - 30-50%, which is installed in the result of conducted research. This characteristic is distinctive from the prototype.

In the prototype as anticorrosive pigment used phosphoric acid and cancellativity the pigment in the present invention, as was proved above, use the crowns of calcium phosphate with its content in the soil-enamel 0.1 to 20%, depending on the metal that cover this ground-enamel. This characteristic is also distinctive from the prototype.

In the prototype as Kohler applied pigment red iron oxide, which stains buildings surface of a reddish-brown color. However, in this kind of ground-enamels can be applied and other color-forming pigments such as yellow iron oxide pigment, pigment blue phtalocyanines, chromium oxide, aluminum powder and others that, without changing the chemical effects on covered ground-enamel metal, changing only the color of the coating. Because color primer-enamel may be different, it is advisable to apply for all koleroga pigmentation treatment is type - 1-10%. This characteristic in common with the prototype.

In the prototype as a dispersant applied polyphosphate sodium, but the same quality can be applied, for example: potassium polyphosphate, sodium pyrophosphate or potassium tripolyphosphate, sodium or potassium, copolymers of acrylic and methacrylic acids, modified polysiloxane. In the present invention polyphosphate sodium or other above substances that perform the same function as dispersant, however, limits their use (results of research) can vary from 0.1 to 1.0% in the composition of the ground-enamel. This characteristic "dispersant" as is common with the prototype.

In the prototype as a thickener used acetylcellulose, which belongs to the group of cellulose ethers. To this group belong also: carboxymethylcellulose, cellulose diacetate, azeotroping cellulose, Tolosa, maculosa, but can be used and polymers of acrylic and methacrylic acid or polyurethanes (polyhydroxyether are sewn with isocyanate groups), which by its action on the part of the ground-enamel similar, so for these substances it is advisable to use the General term "thickener", especially considering that its content in the primer for all substances of this embodiment of the present invention may be a method of obtaining ground-enamel, carried out by the applicant.

In a container with a stirrer prescription number download with stirring, water, thickener, dispersant, crowns calcium phosphate, conduct stirring for 25-30 minutes the mixture is Then served in a ball mill and are dispersing to achieve the degree of milling on the device "wedge" not more than 30 μm. The ground mixture is fed into the mixer and then add prescription number acrylic dispersion. After stirring for 20-30 minutes added to obtain the desired shade of tinting pastes. Next, the ground-enamel check on quality indicators.

For comparing the resistance to static action of corrosive liquids were prepared with the compositions of the primer coatings for the present invention and the composition of the primer of the prototype. When determining the resistance of the film to static action of corrosive liquids primer-enamel was applied on the plate of steel 08 KP, pre-cleaned from rust and fat-free acetone. The resulting coating was utverjdali at a temperature of 202oC for 5 days, then experienced.

Test data are summarized in table. 1, where the PP.1-9 formulations ground-enamel with different ratio is more corrosion resistant primer composition of the prototype.

Claims

The ground-enamel water-dispersible corrosion, comprising a binder, an anti-corrosive pigment, tinting paste, dispersant, thickener and water, characterized in that it contains as a binder acrylic dispersion, as anticorrosive pigment - CZK phosphate-calcium, wt.%:

Acrylic dispersion 30-50

Crowns of calcium phosphate 0.1 to 20

Tinting paste 1-10

Dispersant 0,1-1,0

The thickener of 0.05-0.2

Water The Rest

 

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