RU2050389C1 - Method for production of aqueous-dispersion composition for coatings - Google Patents

Abstract

FIELD: anticorrosive coatings. SUBSTANCE: 68-72 alcohol solution of carboxyl-containing oligomer having acid number 105-125 mg KOH/g is mixed with aliphatic tertiary monoamine and imidazole. Quantities of said ingredients are 7.5-9.2, 0.5-0.7 and 2.5-3.5 mass parts respectively, mass ratio of monoamine and imidazole being 1:5. Thus prepared product is added into aqueous dispersion of carboxylate latex of butadiene styrene rubber, quantity of said dispersion being 73.9-78.7 mass parts. Then direct aqueous emulsion of epoxy oligomer having epoxy number 20-22 is added into thus obtained compound. Mentioned above emulsion contains asymmetrical block copolymer of ethylene oxide and propylene oxide. Quantities of said epoxy oligomer having epoxy number 20-22, asymmetrical block copolymer and water are 70.9-73.2, 0.7-2,4 and 24.4-28.4 mass parts respectively. Mass ratio of compound I and compound II is (97.5-98.5):(1.5-2.5) respectively. EFFECT: improves efficiency of method. 2 tbl

Description

 The invention relates to the field of creating water-borne coating compositions and can be used to obtain compositions that can be used for corrosion protection of factory equipment and building structures, as well as primers under a layer of nitro enamel for auto coatings.

A known method of producing a water-dispersion composition for coatings by sequentially combining in the mixer the recipe amounts of styrene-butadiene latex modified with methacrylic acid, a surfactant dissolved in water, an organic solvent and resorcinol formaldehyde resin. Then pigments, fillers and other target additives are added to this resin [1] Coatings based on compositions obtained by this method are used for auto coatings. Compositions hardy, they may be applied at minus 40 ^C. However, they are characterized by insufficient high barrier properties, heat resistance and low elastic properties, hardness. In addition, coatings cannot serve as a primer for nitro enamel when creating a protective coating system for a car body.

 The closest in technical essence and the achieved result to the proposed method is a method of obtaining a water-dispersible composition for coatings by sequential loading with stirring into the mixer of styrene-butadiene latex modified with methacrylic acid, a surfactant (OP-7, OP-10, etc. .), organic solvents, liquid rezol phenol-formaldehyde resin with an alkali content of 2-7.5% and water, you can also add triethanolamine. After complete mixing, pigments and fillers are added to the composition [2]. The composition obtained in this way is characterized by high viability and adhesion at low temperatures. However, coatings from the compositions obtained in this way, like other known ones, even with their large thickness, do not satisfy the requirements necessary for the operation of factory equipment and structures. They also have low elasticity, hardness, heat resistance and protective properties. They cannot also be used as a primer under nitro enamel.

 The aim of the invention is to increase the heat resistance of coatings, improve their protective and physico-mechanical properties and provide the possibility of using them as soil under nitro enamel.

 This goal is achieved by the fact that in the method of producing a water-dispersion coating composition by combining in the presence of water and an organic solvent latex carboxylate styrene-butadiene rubber with a thermosetting modifier, a surfactant and an aliphatic tertiary monoamine pre-68-72% alcohol solution a carboxyl-containing oligomer with an acid number of 105-125 mg KOH / g is combined with the aliphatic tertiary monoamine and imidazole product of the interaction of monomethyl ether in fatty acids of soybean oil and triethylenetetramine, or mixtures of diethylene triamine and triethylene tetramine in a weight ratio between monoamine imidazole and 1: 5, and then combining the product is introduced into the aqueous dispersion of a carboxylated styrene-butadiene rubber latex with the following ratio of components in the prepared compound, pbw

68-72% Alcohol solution
carboxyl-containing
oligomers with an acid number of 105-125 mg KOH / g 7.5-9.2
Aliphatic tertiary monoamine 0.5-0.7 Imidazole 2.5-3.5 Water 10.8-12.7
Carboxylate butadiene-styrene rubber 73.9-78.7 and a direct aqueous emulsion containing, by weight, is added to the resulting compound.

Epoxy Dianne Oligomer
with an epoxy number of 20-22 70.9-73.2
Asymmetric block copolymer
ethylene oxide and oxide
propylene with a hydroxyl number of 12-16 mg KOH / g 0.7-2.4 Water 24.4-28.4 with a mass ratio between compounds I: II (97.5-98.5) :( 1.5-2 ,5).

In the proposed method, the following components are used:
1. As a latex copolymer of styrene, butadiene and methacrylic acid latex BS-65 grade A according to TU 38.103.550-84.

2. Carboxyl-containing oligomer:
KCH-0125 according to TU 6-10-1997-85, which is a 68-72% solution in isopropyl alcohol or in a mixture of solvents, based on the solution: 4-6 wt. diacetone alcohol and 24-28 wt. isopropyl alcohol, maleated polybutadiene modified with a phenolic resin (FL-0149) (acid number 105-125 mg x xKOH / g), or Residrol VA-133 according to TU 6-10-1705-79, which is 68-72% a solution in the same solvents of the hydrolyzed adduct of maleic anhydride and mixed glycerol ester of rosin and fatty acids of linseed and dehydrated castor oils (acid number 105-125 mg ˙KOH / g).

3. Aliphatic tertiary monoamines:
Triethylamine (TU 6-09-1496-77),
Triethanolamine (Tu 6-09-2448-72).

4. Imidazoles:
I-5M (VTU OP-302-68) is the product of the interaction of soybean oil fatty acid monomethyl ethers and triethylenetetramine;
I-6M (TU 6-10-1438-71) is the product of the interaction of soybean oil fatty acid monomethyl ethers and a mixture of triethylenetetramine and diethylene triamine.

 5. Asymmetric block copolymer of ethylene oxide and propylene oxide NBS grade GDPE-108 (TU 38.402219-82) with a design mol.m. 5000-5500 and a hydroxyl number of 12-16 mg KOH / g.

 6. Epoxy Dian oligomer ED-20 with an epoxy number of 20-22 (GOST 10587-76).

 Table 1 shows examples of the method.

 The method is as follows.

 PRI me R 1. Prepare two compounds I and II.

 Preparation of Compound I.

 To 9.2 parts by weight oligomer KCh-0125 (68% solution in isopropyl alcohol) add 0.7 wt.h. triethylamine and 3.5 parts by weight imidazole I-5M. After that, 12.7 parts by weight are added in portions with stirring. water. Maintain the mixture for 1-2 hours (at a minimum). The finished mixture is added in portions to 73.9 wt. including latex. The prepared compound I must be maintained until combined with compound II to establish adsorption equilibrium for 2-3 hours (minimum).

 Preparation of compound II.

 Download in 28.4 parts by weight water 0.7 wt.h. block copolymer GDPE-108 and mix (can be in a high-speed mixer) until complete dissolution of the block copolymer (1-2 min). After that, download 70.9 wt.h. ED-20. Stirred for 10-15 minutes. Before use, compounds I and II are combined by adding compound II to compound I at a ratio between them (97.5-98.5) :( 1.5-2.5) parts by weight It is important to adhere to the method of adding compound II to compound I.

 Analogously to example 1, the method according to examples 2 and 3 is carried out, changing the ratio of components and the ratio between compounds.

 Application to the surface is carried out by pneumatic spraying, but it is also possible by brush method. The thickness of a single layer coating is 25-40 microns.

 In Control Examples 4-18, methods are described in which the order of administration of the components is changed or the ratio between the compounds or components is changed.

 In the table. 2 presents data on the properties of the compositions obtained by the proposed, control and known methods, and coatings based on them.

 From the table. 2 it follows that coatings based on compositions obtained by the proposed method, with a thickness of 40 μm, i.e. 6-10 times less than the known coatings, are characterized by higher physical, mechanical and protective properties, heat resistance.

 Application of the method will allow to obtain compositions that provide high quality coatings of both equipment and automobile parts.

Claims (1)

 METHOD FOR PRODUCING A WATER-DISPERSION COMPOSITION FOR COATINGS by combining in the presence of water and an organic solvent latex carboxylated styrene-butadiene rubber with a thermosetting modifier, a surface-active substance and an aliphatic tertiary monoamine, characterized in that it is a carboxylic alcohol-based 68% acid number 105 125 mg · KOH / g combined with aliphatic tertiary monoamine and imidazole, the product of the interaction of fatty acid monomethyl esters with evogo oil and triethylenetetramine or a mixture of triethylenetetramine and diethylene triamine in a weight ratio of monoamine and imidazole 1 to 5 and then combining the product is introduced into an aqueous latex dispersion of a carboxylated butadiene-styrene rubber with the following ratio of components in the prepared compound, pbw 68 72% alcohol solution of a carboxyl-containing oligomer with an acid number of 105 125 mg KOH / g 7.5 9.2
Aliphatic tertiary monoamine 0.5 0.7
Imidazole 2.5 3.5
Water 10.8 12.7
Styrene-carboxylate-butadiene rubber 73.9 78.7
and to the resulting compound add a direct aqueous emulsion containing, by weight.h. Epoxy Dian oligomer with epoxy number 20 22 70.9 73.2
Asymmetric block copolymer of ethylene oxide and propylene oxide with a hydroxyl number of 12 16 mg · KOH / g 0.7 2.4
Water 24.4 28.4
with a mass ratio between compounds (97.5 98.5) (1.5 2.5).

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