RU2268275C2 - Water-dispersed lacquer composition - Google Patents

Abstract

FIELD: varnish-and-paint industry.

SUBSTANCE: invention relates to lacquer materials for primer coating as well as independent coating. Water-dispersed lacquer composition includes acrylate-containing dispersion, pigments, including structure chromate and zinc phosphate at ratio 1:(10-50), polyurethane and cellulose and/or acrylic thickener, surfactant, coalescent additive, corrosion inhibitor, water, and fluorine-containing flow property-enhancing additive. Composition may further contain neutralizer, form suppressor, and antifreeze.

EFFECT: increased adhesion for aluminum and water resistance, speeded up drying under environmental conditions.

4 cl, 2 tbl, 7 ex

Description

The invention relates to paints and varnishes for coatings and can be used in the oil, gas, energy, chemical and other industries to protect the surface of structures made of ferrous and non-ferrous metals, operated under normal conditions and conditions with high humidity.

Known water-dispersion paint composition, including a water-borne binder, pigments, a neutralizing base, antifoam, thickener, corrosion inhibitor, surfactants, coalescing additives, biocidal additive, water (Primer VD-AK-0247, technological instruction YAF 60-429- 98).

However, it has insufficient adhesion to a damp surface, is not resistant to the action of cutting fluids and contaminants.

Closest to the invention is a paint composition comprising an acrylate-containing dispersion, an emulsion based on epoxy Dianova resin, pigments, including strontium chromate and zinc phosphate in a ratio of 1: 9, a coalescing additive, a biocidal additive, a surfactant, a corrosion inhibitor, a thickener water [US Pat. RF №2154079, publ. 08/10/2000. Bull. No. 22].

However, it has insufficient adhesion to aluminum, water resistance, and dries slowly under natural conditions.

The objective of the invention is to increase adhesion to aluminum, water resistance, accelerate drying in natural conditions.

The problem is solved by introducing an acrylate-containing dispersion, a thickening agent, pigments, including strontium chromate and zinc phosphate, a corrosion inhibitor, a biocide additive, a coalescing additive, a surfactant, water, and an additional fluorine-containing additive in a water-dispersion varnish-and-paint composition, as a thickener, at the same time polyurethane and cellulose and / or acrylic, and using strontium chromate and zinc phosphate in a ratio of 1: 10-50, respectively, in the following ratio components, wt.%:

Acrylate-containing dispersion (50% dispersion in water) 30-80 Polyurethane Thickener 0.1-0.5 Acrylic and / or cellulose thickener 0.1-0.4 Pigments, including strontium chromate and zinc phosphate in a ratio of 1: 10 ÷ 50 2-30 Coalescing agent 1.0-5.0 Biocide supplement 0.01-0.5 Surface-active substance 0.2-3.0 Corrosion inhibitor 0.1-0.5 Fluoride additive for filling 0.01-1.0 Water Rest

The water-dispersion paint composition may additionally contain a neutralizer in an amount of 0.1-0.5% wt., Antifoam in an amount of 0.1-0.5% wt., Antifreeze in an amount of 2.5-6.0% wt.

As the acrylate-containing dispersion, a styrene-acrylic dispersion of the Lakroten E-24 brand manufactured by PKF Orkhimprom of the city of Dzerzhinsk, an acrylic dispersion of Maincote HG-56 from Rohm and Haas, the Netherlands, an acrylic modified with esters of versatic acid of the Finndisp RSD-20 brand from Forcit, Finland and others, are used. any acrylic, styrene acrylic and modified acrylic dispersions.

As an acrylic and / or cellulose thickener, water-soluble acrylic-based copolymers are used, in particular, an aqueous dispersion of a copolymer of butyl acrylate and methacrylic acid of the brand Lacryl 41 (TU 2241-008-39251899-69), acrylic latexes based on ethyl acrylate of the Polyphob 9832, "" Polyphob TR-117 ”from Union Carbide, sodium carboxyl cellulose (Na-CMC) TU 6-55-40-90, hydroxyethyl cellulose, for example, Natrosol 250 HR and 250 HBR (Hercules) and others.

As a polyurethane thickener, water-soluble polymers based on modified polyurethanes are used, for example, Akrisol RM 1020 and Akrisol RM-8 from Rohm and Haas, hydrophobically-modified polyurethane resin of the brand Laprol DZ (Russia) and others.

As pigments, titanium dioxide is used (GOST 9808-74); pigment red iron oxide (TU 6-10-1618-77); technical carbon; zinc phosphate; strontium chromate; Omiakarb, which is calcium carbonate (at least 98%) from Omia; kaolin (GOST 19608-84); ground talc (TU 6-21-25-201-77); mica (SMSP-10- TU 572510-001-31894267-02); ground mica for the rubber industry (GOST 855-74) and others.

As a corrosion inhibitor, a zinc-containing complex salt of the brand SER-AD-FA-179 from Servo, Germany; sodium nitrite, sodium benzoate and others.

Butyl glycol (TU 6-01-648-78) is used as a coalescing additive; 2,2,4-trimethyl-1,3-pentadiolmonoisobutyrate (m. Texanol), methyl diglycol and others.

Ethylene glycol (GOST 10136-77), di-ethylene glycol (GOST 10136-77), propylene glycol and others are used as antifreeze.

As a surfactant, ethoxylated alkyl phenols are used, for example, the auxiliary substance OP-7 or OP-10 (GOST 8433-81), CF-10 triton from Union Carbide company, the sodium or ammonium salt of polycarboxylic acids of the Orotan 731K brand (35%) (f Rohm and Haas), Orotan 165 brand (21%) (f. Rohm and Haas); sodium polyphosphate (GOST 20291-86) and others.

As a fluorine-containing additive for filling, fluorinated surfactants are used, for example FC-171 or FC-129 f. 3M, modified with fluorinated hydrocarbon neutralized polyacrylate m. Efka 3570, f. Efka Holland and others.

As a biocidal additive, substances based on Tiuram D brand tetramethyltiuram disulfide (GOST 740-76) based on isothiazoline and halogenated derivatives of alkanol brand Metatin K 520 f are used. Acima, Switzerland; based on 2-n-octyl-4 isothiazoline brand Skane 8 (F. Rohm and Haas) and others.

Defoamers used are defoamers based on polysiloxane grade BIK-022, BIK-024, based on a mixture of aliphatic hydrocarbons and emulsifiers brand Foamaster NXZ F. Cognis, Germany and others.

The paint composition according to the invention is prepared as follows:

1. Prepare a semi-finished pigment paste in a mixer by dissolving surfactants, a thickener, a biocidal additive and, if necessary, a neutralizing base.

2. Make a mixture of pigment paste in a high-speed mixer by loading with a working mixer a semi-finished product for pigment paste, pigments and, if necessary, antifoam and antifreeze and mixing to a homogeneous mass.

3. The pigment paste is dispersed in a bead mill.

4. A semi-finished product of an acrylate-containing dispersion is prepared in a mixer by loading with constant stirring an acrylate-containing binder, coalescing additives, thickeners and, if necessary, an antifoam and mixing to a homogeneous mass.

5. A water-dispersion paint composition is prepared by loading into the mixer with constant stirring a semi-finished product of acrylate-containing dispersion, pigment paste, corrosion inhibitor, fluorine-containing additive for filling.

The composition is applied with a brush, roller, spray gun. Examples of the composition according to the invention are shown in table 1, the properties of the coatings in table 2.

As can be seen from the table, the proposed composition in comparison with the known has the best adhesion to aluminum, water resistance and drying in natural conditions.

table 2 Name of indicator The prototype of US Pat. RF 2154079 Examples of the invention No. 1 Number 2 Number 3 Number 4 Number 5 Number 6 one 2 3 four 5 6 7 8 1. The drying time of the coating at (20 ± 2) ° C to the degree of 3 h (GOST 19007-73) 3 one one one one one one 2. The hardness of the coating according to the pendulum device type TML pendulum A, relative units (GOST 5223-69) 0.25 0.4 0.35 0.6 0.4 0.35 0.6 3. Elasticity in bending, mm (GOST 6806-73) one one one one one one one 4. Adhesion, points (GOST 15140-78, section 2) one one one one one one one 5. * Adhesion to wet surfaces by asbestos cement one one one one one one one 6. * * Wet coating adhesion by a) steel 3 ₁ 1 ₁ 1 ₁ 1 ₁ 1 ₁ 1 ₁ 1 ₁ b) aluminum 3 ₁ 1 ₁ 1 ₁ 1 ₁ 1 ₁ 1 ₁ 1 ₁ 7. Resistance to static action of water, h 720 1000 1000 1000 1100 1200 1000 * The adhesion to the wet surface of asbestos cement was checked as follows: The plates of asbestos cement were kept under conditions of high humidity for 8 hours, then they were rubbed and a paint composition was applied to the wet surface. Maintained at (20 ± 2) ° С for 24 hours and checked the adhesion according to GOST 15140, p. 2. ** The method for determining wet adhesion is as follows: the coated metal plate is kept in distilled water at a temperature of (20 ± 2) ° C for 3 days, then the plates are removed from the water, the coating is dried using filter paper and immediately determined adhesion by parallel incisions using adhesive tape. The adhesion value is evaluated according to GOST 15140-78.

Claims (4)

1. Water-dispersion varnish-and-paint composition, including acrylate-containing dispersion, thickener, pigments, including strontium chromate, zinc phosphate, coalescing additive, corrosion inhibitor, biocidal additive, surfactant, water, characterized in that it simultaneously as a thickener contains a polyurethane thickener and cellulose and / or acrylic, strontium chromate and zinc phosphate are used in a ratio of 1: 10-50, and additionally contains a fluorine-containing additive for bottling in the following ratio of components, wt.%: Acrylate Dispersion (50% dispersion in water) 30-80 Polyurethane Thickener 0.1-0.5 Acrylic and / or cellulose thickener 0.1-0.4 Pigments, including strontium chromate and zinc phosphate in a ratio of 1: 10-50 2-30 Coalescing agent 1.0-5.0 Biocide supplement 0.01-0.5 Surface-active substance 0.2-3.0 Corrosion inhibitor 0.1-0.5 Fluoride additive for filling 0.01-1.0 Water Rest 2. Water-dispersion paint composition according to claim 1, characterized in that it further comprises a neutralizer in an amount of 0.1-0.5 wt.%. 3. Water-dispersion paint composition according to claims 1 and 2, characterized in that it further comprises an antifoam in an amount of 0.1-0.5 wt.%. 4. Water-dispersion paint composition according to claims 1 to 3, characterized in that it additionally contains antifreeze in an amount of 2.5-6.0 wt.%.