Composition for protective cover

FIELD: building materials.

SUBSTANCE: invention relates to latex-base composites used for making protective covers on polymeric materials, metal, wood, splint-slab and wood-fiber plates, concrete, ceramics, cardboard, paper and other materials. The composition comprises the following components, wt.-%: acrylate latex, 30.0-80.0; butadiene-styrene soft latex, 10.0-19.0; butadiene-styrene rigid latex, 5.0-9.0; filling agent, 12.0-21.0; pigment, 0.5-6.5; carbamide, 0.5-2.0; 10-50% alkali an aqueous solution, 0.1-2.0, and water, the balance. Invention provides preparing the cover that shows high stability under atmosphere conditions, climatic factors and wetting abrasion. The cover can be applied on materials by preliminary applying the composition by film layer on backing and the following thermal transfer of this layer from backing on surface to be covered.

EFFECT: improved, enhanced and valuable properties of composition.

2 tbl

 

The invention relates to compositions based on rubber latex used for the deposition of protective coatings on polymeric materials, metal, wood, fibreboard and chipboard, concrete, ceramics, cardboard, paper and other materials.

Known water-dispersion composition for protective and decorative coatings applied to concrete, brick, wood, ceramics, and other materials for the purpose of corrosion protection in environments of medium degree of aggressiveness (RF patent No. 2050390, 09 D 109/08, 5/02, publ. 20.12.1995). The composition includes a styrene-butadiene latex SCS-GP, pigment, filler, nonionic surfactant, carboxy-methylcellulose, Novolac resorcinolformaldehyde resin SF-280, formalin, alkofer B, sulfur polymer, white carbon and water.

The butadiene-styrene latex SCS-GP is a dispersion of rubber with a ratio of butadiene and styrene 35:65, the dry residue of the latex of 48% and a pH of 11.5 to 12.5.

Novolac resorcinolformaldehyde resin SF-280 is a 60%aqueous polycondensation product of resorcinol and formaldehyde.

As a pigment may be used titanium dioxide rutile forms, red and red organic pigments, micaceous iron pigment, aluminum powder, zinc white.

Known composition for anti-corrosion paint coating applied is left on the metal, concrete, wood. The composition includes a latex of diene copolymer, a phosphate binder on the basis of phosphoric acid FC-3, ethoxylated monoalkylphenols, talc, mono - or di - or triethanolamine, kaolin pigment and water (patent RF № 2017774, 09 D 109/00, 5/08, publ. 15.08.1994).

Known primer designed for applying protective and decorative coatings on metal, wood, concrete, chipboard plates (patent RF №2017776, 09 D 109/08, 5/12, publ. 15.08.1994). The primer contains a latex of butadiene-styrene, the aqueous dispersion of polymeric resin, pigment-filler, liquid glass, modified silica, latex, butadiene or chloroprene, or natural chromium dioxide, tetraethoxysilane and dipentene.

Closest to the proposed composition of the components is known composition for coating-type primer or filler (patent RF № 2016032, 09 D 109/04, 5/02, 5/12, 5/34, publ. 15.07.1994). This composition comprises 30-50%latex with a pH of 2.5-6.0 copolymer of butadiene, Acrylonitrile and monoclonal acid with the ratio of monomers (20-60):(10-40):(30-40) and mol. m 104-105, filler, pigment, 10-25%aqueous solution of ammonia and/or 10-50%aqueous solution of caustic soda or caustic potash, emulsol on the basis of mineral oils in the following ratio, wt.%:

latex 30-50%with a pH of 2.5-6.0 copolymer Boo is adiana, Acrylonitrile and methacrylic acid with a ratio of monomers (20-60):(10-40):(30-40) and molm 104-105in terms of dry substance - 3,0-9,0; filler - 31,0-70,0; pigment - 1,0-19,0; emulsol on the basis of mineral oils - 0,01-1,0; 10-25%aqueous solution of ammonia and/or 10-50%aqueous solution of caustic soda or sodium hydroxide is 0.1 to 5.0; water - the rest.

As filler can be used chalk, kaolin or talc, and the pigment is titanium dioxide, zinc oxide or iron oxide pigment.

This composition dries quickly, but the coverage of it has a low resistance in atmospheric conditions, under the influence of climatic factors and wet abrasion. In addition, the composition cannot be applied film layer on a substrate, followed by thermal transfer film layer formed to cover the surface.

The present invention solves the problem of increasing resistance of the coating under atmospheric conditions, under the influence of climatic factors and wet abrasion, and also provides the possibility of applying the composition of the film layer on a substrate, followed by thermal transfer film layer formed to cover the surface.

This technical result is achieved in that the composition for protective coatings including latex, filler, pigment, 10-50%aqueous alkali solution is water, it also contains urea, whereas the latex used a mixture of acrylate, butadiene-styrene soft and butadiene-styrene hard latexes in the following ratio, wt.%:

acrylate latex - 30,0-38,0; butadiene-styrene soft latex - 10,0-19,0; butadiene-styrene hard latex - 5,0-9,0; filler - 12,0-21,0; pigment - 0,5-6,5; urea - 0.5 to 2.0; 10-50%aqueous solution of alkali - 0,1-2,0; water - the rest.

As filler can be used kaolin, chalk, talc, mica, quartz flour, and as a pigment - titanium dioxide, organic and micaceous iron pigments, aluminum powder, zinc white, red lead, soot, etc.

Urea improves the uniform distribution of the filler and pigment in the composition, which increases the resistance in atmospheric conditions, under the influence of climatic factors and wet abrasion.

Acrylate latex increases the adhesion of the coating to the substrate at a lower adhesion to the substrate, which can be used a polyester or polyamide film.

Butadiene-styrene soft latex contains not more than 65% styrene, increases the elasticity of the coating. Butadiene-styrene hard latex contains more than 65% styrene, increases the rigidity of the coating. Introduced into the composition in the specified ratio boutade the n-styrene soft and hard latexes increase resistance to atmospheric and climatic influences, wet abrasion.

10-50%aqueous alkaline solution to adjust the pH of the composition to improve the adhesion to the coated surface.

The composition applied to the substrate flexographic or deep printing method in the range from 10 to 25 g/m2. The obtained composite layer is transferred from the substrate to cover the surface by way of sublimation, in which the composition layer together with the substrate to press the substrate and heated. When the temperature of the transfer adhesion of the composite layer to cover the surface increases to a value sufficient for a reliable hold. When this adhesion to the substrate is low. Then the substrate is removed. The composition layer remains on the substrate, forming a protective coating.

The proposed composition can be applied directly to the coated surface, for example, irrigation or spraying. In this case, the substrate is not required.

Examples of formulations of the composition and properties of the obtained coatings are presented in tables 1 and 2.

Table 1
Examples of the compositions
p/pComponentsContent, wt.%
Composition 1Part 2Part 3
1Acrylate latex32,034,035,5
2Butadiene-styrene soft latexto 12.015.018,0
3Butadiene-styrene tight latex5,56,28,5
4Filler19,518,015,5
5Pigment6,04.72,8
6Urea1,21,31,4
710-50%aqueous solution of alkali0,10,10,3
8Water23,720,718,0

Table 2
Properties of protective coatings
№ p/pPropertiesComposition 1Part 2Part 3
1The temperature of the transfer of the coating from the substrate to cover the surface, °205190185
2The adhesion of the coating to the substrate according to GOST 1540-78, score211
3The adhesion of the coating to the substrate according to GOST 15140-78, score444
4Resistance in atmospheric conditions according to GOST 6992-68, score788
5Resistance to climatic factors according to GOST' 9401-91, scoreA3-2A3-IA3-I
6Resistance to wet abrasion, the number of cycles5090100

For the preparation of compositions of compounds 1, 2, 3 shown in table 1, used acrylic latex type AC 4800 ER, butadiene-styrene soft latex brand DL950 and butadiene-styrene hard latex brand DL940. As the filler used kaolin as a pigment is carbon black, and as a 10-50%aqueous solution of alkali used 50%aqueous sodium hydroxide solution.

Composition of formulations 1, 2, 3 were prepared by mixing the components, taken in the ratio given in table 1. The obtained composition was applied on a substrate flexographic printing method in the amount of 20 g/m2. As the substrate used is ovali Mylar film. Formed on the substrate of the composite layer were transferred to the coated surface by tightly pressed to her with the substrate and heating to a temperature of migration, in which the adhesion adhesion of the composite layer with the coated surface will exceed the adhesion adhesion to the substrate and reaches the value that is sufficient for a reliable hold of the composite layer. Temperature transfer are listed in table 2. Then the substrate was removed. Composite layer remain on the substrate, forming a protective coating.

Instead of the acrylate latex type AC 4800 ER, which is a copolymer of Acrylonitrile, can be used: acrylic latex brand Z 91930 - copolymer of butyl methacrylate, acrylate latex brand AcronaLDI8 - methacrylic acid copolymer, acrylate latex brand DS910 - copolymer of butyl acrylate, acrylate latexes other brands.

Instead of caustic soda, as a 10-50%aqueous alkali solution can be used: sodium hydroxide, ammonia, monoethanolamine, other alkaline substances.

The resistance of the protective coating to atmospheric and climatic influences, wet abrasion resistance was determined by the method of accelerated testing. The results obtained are presented in table 2 and indicate the achievement of a technical problem.

To notice for protective coatings, including latex, filler, pigment, 10-50%aqueous solution of alkali and water, characterized in that it further contains urea, whereas the latex used a mixture of acrylate, butadiene-styrene soft and butadiene-styrene hard latexes in the following ratio, wt.%:

Acrylate latex 30,0-38,0

Butadiene-styrene soft latex 10,0-19,0

Butadiene-styrene hard latex 5,0-9,0

Filler 12,0-21,0

Pigment 0,5-6,5

Urea 0.5 to 2.0

10-50%aqueous alkali solution of 0.1-2.0

Water the Rest



 

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