Aqueous-dispersion anticorrosion base coat

FIELD: chemistry.

SUBSTANCE: base coat contains an acrylic dispersion, anticorrosion pigments and filler materials, a dispersing agent, a thickener and water. In order to improve anticorrosion properties of the coating, the base coat contains a water-soluble corrosion inhibitor mixture of potassium octadecanoate, tripotassium phosphate, 2,2',2"-nitrilotriethanol and a surfactant - technical mixture of polyethyleneglycol ethers of monoalkylphenols, which improves wettability and adhesion of the paint coat to metal surfaces.

EFFECT: high environmental safety during painting and good anticorrosion properties of the coating when used in aggressive atmospheric conditions.

1 tbl

 

The invention relates to a water-dispersion varnish and paint materials intended for the protection against corrosion of metal surfaces used in aggressive atmospheric conditions, including high humidity conditions. Can be used as a primer and as an independent paint. The ground-enamel includes acrylic dispersion, anti-corrosive pigments and fillers, a dispersant, a thickener and water. To improve the anticorrosive properties of the coating consisting of a primer-enamel used water-soluble organic corrosion inhibitor based on a mixture of phosphates of sodium and potassium salts of fatty carboxylic acids and amino compounds and surfactant based on ethoxylated ALKYLPHENOLS trimmers propylene improving wettability and adhesion of the paint coating to the metal surface. The technical result - the increase of ecological safety when carrying out painting and high anticorrosive properties in aggressive atmospheric conditions, including high humidity conditions.

Currently on the market are water-dispersion paints for building purposes, including for corrosion protection of metal surfaces [patent RU 94032085, EN 2268275, EN 2260608, EN 2017774, US 2009078158, O 2008031603, CN 101045843, Lobkovsky VP and others, coatings No. 4/1999, p.7]. Used in their composition of phosphoric acid and its compounds allows to obtain a corrosion-resistant coating on corroded metal surfaces, however, these coatings have poor adhesion and insufficient service life in the ambient conditions (not more than 2-3 years). The use in the composition of a water-dispersible materials of pigments based on chromium compounds (CZK calcium phosphate, chromate and tetrachromat zinc and others) increases the corrosion resistance of the paint coating. However, chromium compounds have high toxicity. Compounds that are widely used to reduce the toxicity of anti-corrosion coatings are various salts of phosphoric acid (phosphates of zinc, aluminum, barium, calcium and other). Experience of application of phosphate anticorrosive pigments in the coatings showed that they, due to their low solubility, are ineffective in the early stages of development sub pellicle corrosion [Wienand Y.Ostertag W.Farbe und Lack, 1982, d.88, No. 3, s.183-188].

Many corrosion inhibitors in aqueous solutions provide protection of metals due to formation of nanoscale thin film insoluble complex compounds with metal cations [Kuznetsov SCI Physico-chemical aspects of protecting metals from corrosion nano - and micro is diversified coatings: Dokl. International conference "Physico-chemical basis of the newest technologies of the XXI century". M, 30 may - 4 June, 2005]. The formation samoopredelivsheisia of monolayers on metal surfaces is one of the ways of practical application of nanotechnology in the field of corrosion protection [Kalman Erica, Korroz.Figy. 2007, 47, No. 4, p.98-101]. The use of corrosion inhibitors in the coating materials are not always gives a positive effect, because it reduces the adhesion to metal.

Replacement of toxic pigments on low-toxic corrosion inhibitors, allowing you to get on the metal surface nano protective film while maintaining the level of adhesion of the paint coating is relevant.

Closest to the claimed invention and taken as a prototype is the ground-enamel waterborne anticorrosive series "Êronakril" (Russian Federation patent RU 2223996 C1, MKI C09D 5/12, C09D 5/10, C09D 133/00). The composition includes an acrylic dispersion, tinting paste, dispersant, thickener and water, and as anti-corrosion pigment - CZK calcium phosphate. The use of calcium phosphate crown to the ground enamel provides piscivorous activity in the interaction of potatochroot with the metal substrate of ferrous and non-ferrous metals, providing cathodic and anodic protection.

To cons is dam this part applies the high toxicity of chromium compounds.

The task of the invention is the creation of low nanoengineering waterborne anticorrosive primer-enamel with a high level of anti-corrosion properties in aggressive atmospheric conditions with high humidity.

This object is achieved in that the water-dispersion primer-enamel instead of calcium phosphate crowns are introduced, along with low-toxic zinc phosphate, water-soluble organic corrosion inhibitor pestiviruses type that do not contain compounds of chromium, and a surfactant that provides adhesion-inhibitory effect on the metallic surface.

As acrylic dispersions used acrylic dispersion, modified esters of versational acid brand "Finndisp RSD 20" firm "Forcit" (Finland), acrylic dispersion brand "Mowilit DM 777" company "Celanese Emulsion GmbH" (Germany) or any other acrylic and modified acrylic dispersion. The composition of the acrylic dispersions are cholesteremia supplements butylglycol [THE 6-01-648-78]; 2-(2-butoxy)ethoxyethanol [butyldiglycol] company "Union Carbide Benelux N.V. (USA); 2,2,4-trimethyl-1,3-pentacyanonitrosylferrate [brand "Texanol"] company "Eastman Chemical Company (USA) and others. It is preferable to use a mixture of Texanol and butyldiglycol in the ratio of 4:1.

As a dispersant IP is result ammonium salt of a polymeric carboxylic acid brand Dispex A40 firm "Forcit" (Finland), an aqueous solution of the modified polymer stamps Dispers 750W company Evonik Tego Chemie GmbH (Germany) or any other wetting and dispersing additive for water-based industrial paints.

As a thickener used karboksimetilcelljulozy thickeners type methylhydroxypropylcellulose, polyurethane thickeners of the type Tafigel PU 60 firm "Munzing Chemie GMBH (Germany), or any other thickeners for water-based industrial paints.

As anticorrosive pigments used phosphates, oxides of zinc, iron oxide pigments. As fillers are natural (chalk, marble, limestone) or precipitated calcium carbonate, or any other fillers for water-based industrial paints.

As the water-soluble organic corrosion inhibitor, a mixture of potassium octadecanoate, tripotassium phosphate, 2,2',2"-Nitrilotriethanol [THE 37-111-1-39-03 "Passivating composition of IPHAN-ALG"]. This inhibitor has been used as corrosion inhibitors for long term conservation of metal products. Inhibitory effect due to the electron-donating properties that promote chemisorption of the inhibitor and the formation of insoluble complexes shielded metal with organic compounds. Unlike phosphates this inhibitor begins the time when forming the paintwork due to its water-soluble form.

Surface-active substances (surfactants) are substances, adsorption of liquid on the surface of the partition with a different phase (solid, liquid or gaseous) leads to a significant reduction of surface tension. This property of surfactants is used to improve wetting of the pigments in dispersion in the aqueous medium. As the use of surfactants ethoxylated ALKYLPHENOLS based on the trimmers propylene, representing a technical mixture of polyethylene glycol ethers of monoalkylphenols of the following composition [TU 2483-077-05766801-98 "Neonols. Technical conditions"]:

With9H19With6H4O(C2H4O)nN

where C9H19is an alkyl radical of isononyl attached to the phenol predominantly in the para-position to the hydroxyl group;

n is the average number of moles of ethylene oxide attached to pray one of the APS is equal to 6.

The use of this surfactant improves the wettability of the pigment in the dispersion, but also improves the wettability of the metal surface with a passive layer of corrosion inhibitor, thereby improves the adhesion of the paint coating. This is due to the presence nonagenda surfactant hydrophilic ether and hydroxyl groups. If this connection does not dissociate in water as ions, contains Vigny phenolic atom, reacting with ethylene oxide, which determines its polarity. The surfactant forms an adsorption layer of hydrophobic radicals to the surface of the particles of a corrosion inhibitor, and hydrophilic groups toward the aqueous dispersion. The equilibrium thickness of the adsorption layer can reach values of 10 to 20 nm and depends on the degree of oksietilirovannye surfactant and its concentration.

The novelty of technical solutions is determined by the choice of components in optimal quantities, can, in the drying of the paint coating to form on the metal surface nanoscale thin films of complex compounds, which improves the adhesion of the coating to the metal and its corrosion properties.

An example implementation of the present invention may be a method of obtaining a water-based anticorrosive primer-enamel, made by the applicant.

In the capacity of a bead mill in the prescription number download anticorrosive pigments and fillers, surfactants, corrosion inhibitor, dispersant and thickener and lead the dispersion 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. Stir the mixture for 20-30 minutes Then the ground-enamel check on quality indicators.

For comparison, the properties of l is corsocomo coating compositions were made the ground-enamel according to the present invention. The composition of the ground-enamel was applied to a thoroughly cleaned from grease plate of steel 08KP size of 150×70×1 mm coating Method is a pneumatic spraying. The formulations were applied in 2 coats with drying each coating layer at a temperature of 20±2°C for 1 h Before testing the obtained coating was kept at a temperature of 15-30°C and humidity not more than 80% within 14 days.

Examples of ground-enamel according to the invention are shown in table 1.

45 0,1-1,0
Table 1
Name ingredientsThe prototype for .RU 2223996, wt.%Quantitative composition (content of ingredients, wt.%
Examples according to the invention
1234567
1 Acrylic dispersion30-50303540404545
2 CZK phosphate-zinc0,1-20-------
3 Tinting paste1-10-------
4 Anticorrosive pigments and fillers, including zinc phosphate-25252531313131
10555555
5 Disperser0,1-1,00,1-1,00,1-1,00,1-1,00,1-1,00,1-1,00,1-1,0
6 Thickenerof 0.05-0.2of 0.05-0.2of 0.05-0.2of 0.05-0.2of 0.05-0.2of 0.05-0.2of 0.05-0.2of 0.05-0.2
7 SAS-0,050,10,10,30,30,50,5
8 water-Soluble organic corrosion inhibitor-00,250,50,751,01,52,0
9 WaterRestRest
The indicators used to characterize the structure:
1 ADH is Zia, points (according to GOST 15140-78, Radel 2)1*)4111112
2 Adhesion points (according to GOST 15140-78, Radel 4)-31111111112121
3 the strength of the film in bending, in. (mm according to GOST R 52740-2007)13311113

Name ingredientsThe prototype for a stalemate. EN 2223996, wt.%Quantitative composition (content of ingredients, wt.%
Examples according to the invention
1234567
4 the strength of the film upon impact, kgf×cm (according to GOST R 53007-2008)-15155050502525
5 Resistance to static exposure to 3%NaCl solution at a temperature of (20±2)°C, h (according to GOST 9.403-80)55557272724848
6 Resistance to static action of water at a temperature of (20±2)°C, h (according to GOST 9.403-80)300120240150015001500720720
7 Duration
tests for resistance to the effects of variable temperature, increased the th humidity and solar radiation, cycles (according to GOST 9.401-91, method 5)
-15255050604040
8 Evaluation of appearance after the test for resistance to the effects of variable temperature, humidity and solar radiation, score (according to GOST 9.407-84)-A32A32A32A32A32A32A32
9 Claimed the life in a temperate climate, years (according to GOST 9.401-91, Appendix 10)3,5-52366744

For comparison, the adhesion strength of the coating on the metal surface according to the claimed invention adhesion was determined according to GOST 15140-78, sections 2 and 4, the film strength in bending according to GOST R 52740-2007 and impact strength according to GOST R 53007-2008. For comparison, the corrosion St. istwa paint coating was evaluated resistance of the film to static action of water and 3%NaCl solution at a temperature of 20±2°C, the resistance variable temperature, humidity and solar radiation according to GOST 9.401-91, method 5. The projected service life of the paint coating in a temperate climate in the claimed invention was determined in accordance with Annex 10 GOST 9.401-91.

Adhesion and service life in the temperate climate of the prototype was made based on the stated rate of technical conditions on the ground-enamel "Êronakril" THE 2316-002-57771065-2003 and paint "Êronakril-rail" THE 2316-008-13938162-2004.

We offer water-based anticorrosive primer-enamel compared with the prototype has better anti-corrosion properties. The ground-enamel does not contain chromium compounds. The use of ground-enamel according to the claimed invention for the protection of large structures provides high anticorrosive properties of the coating in corrosive atmospheric conditions and environmental safety when carrying out painting works.

Water-based anticorrosive primer-enamel with water acrylic dispersion, anti-corrosive pigments and fillers, dispersant, thickening agent, nonionic surfactant, water-soluble organic corrosion inhibitor, and water, characterized in that as the nonionic surfactant contains technical mixture of poly is etilenglikolevykh esters of monoalkylphenols:
With9H19With6H4O(C2H4O)nN
where C9H19is an alkyl radical of isononyl attached to the phenol predominantly in the para-position to the hydroxyl group,
n is the average number of moles of ethylene oxide attached to one pray ALKYLPHENOLS, equal to 6,
as the water-soluble organic corrosion inhibitor comprises a mixture of potassium octadecanoate, tripotassium phosphate, 2,2',2"-Nitrilotriethanol, the composition of water-based anticorrosive primer-enamel, wt.%:

Acrylic dispersion40÷45
Anticorrosive pigments and fillers25-31
Disperser0,1÷1,0
Thickener0,05÷0,2
Surfactant0,1÷0,3
Water-soluble organic corrosion inhibitor0,5÷1
Waterrest



 

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Coated articles // 2413746

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27 cl, 9 tbl, 15 ex, 1 dwg

FIELD: chemistry.

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EFFECT: coating provides high anti-corrosion protection of metal substrates.

11 cl, 1 tbl, 6 ex

FIELD: chemistry.

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

9 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the paint industry, particularly to aqueous dispersions based on vinylidene fluoride for obtaining protective paints. The vinylidene fluoride-based aqueous dispersions contain polymer particles with average size of 0.260-0.3 micrometres, obtained via polymerisation of vinylidene fluoride-based emulsions, optionally in the presence of one or more fluorinated copolymers, in the presence of a bifunctional surfactant of formula: A - Rf - B (I), where: A = -O-CFX-COOM; B = -CFX-COOM; X = F, CF3; M=NH4 alkali metal, H; Rf denotes a straight or branched perfluorinated chain; or a (per)fluoropolyester chain.The average molecular weight (I) is in the range 650-800. Described also is use of vinylidene fluoride-based aqueous dispersions to produce water-based protective paints and protective paint for metal bases, obtained using vinylidene fluoride-based aqueous dispersions; use of aqueous dispersions of polymers based on vinylidene fluoride to obtain powder used in preparing protective paints for powder coatings.

EFFECT: coatings obtained using paints which contain vinylidene fluoride-based aqueous dispersions have good physical and mechanical properties.

17 cl, 5 tbl, 11 ex, 8 dwg

FIELD: chemistry.

SUBSTANCE: aqueous coating composition contains aqueous dispersions of polyurethane urea, aqueous or water-base binder with hydroxyl functional groups, selected from a group comprising polyester resins, polyurethane resins, polyureaurethane resins, polyacrylate resins or combinations of said types of resins, polyisocyanates, possibly modified to endow them with hydrophilic properties, as well as foam-stabilisers.

EFFECT: obtaining coating with excellent soft touch which has resistance to scratching and dissolving without additional ground coating and finishing.

14 cl, 5 ex

FIELD: chemistry.

SUBSTANCE: coating composition contains a polyvinyl chloride polymer, an acrylic resin which is preferably a polymer obtained from monomer acrylates or methacrylates, such as acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate resins, copolymer resins of said components or mixtures thereof, a cross-linking agent which is obtained from phenol, para-tert-butylphenol, xylenol or mixture thereof, and formaldehyde, an additive, a dye and a solvent component, and the composition essentially does not contain bisphenol A diglycidyl ether (BADGE) and bisphenol A resin. The coatings are suitable for containers made from three parts, as well as for metal cans made through deep-drawing. The coatings are particularly useful for covers which are torn in order to open due to their unusual flexibility and resistance to sterilisation.

EFFECT: composition provides coatings for metal cans which have suitable flexibility, resistance to scratching, adhesion and sterilisation during processing while in contact with food.

18 cl

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