Method of finishing

 

(57) Abstract:

The method refers to the leather industry and can be used when finishing chrome-tanned leather for Shoe uppers. On semi-finished leather consistently applied non-pigmented primer coating ink and the fixer. Non-pigmented primer contains 20% aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio 30 : 30 : 38 : 2, penetrator and water. Top coat paint contains pigment concentrate, 20% aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio 30 : 30 : 38 : 2, 40%-percent aqueous polyurethane dispersion, additives and water. The method allows to obtain coatings on the skin with high performance properties. table 2.

The invention relates to the leather industry and can be used when finishing chrome-tanned leather for Shoe uppers.

There is a method of finishing by successive deposition of layers of non-pigmented primer, pigmented primer and top coat paint, and in each of the layers impose additional dispersion of polyvinyl chloride obtained by the method of emulsion the technical solution is the way to finishing by a consecutive application of non-pigmented soil, containing, wt.%: acrylic emulsion, A 20% - 10, the variance MH - 30 20% - 20, the penetrator - 4 and water - the rest, pigmented primer and coating paint containing, wt.%: pigmented concentrate - 9,8, casein 10% and 3.4, wax emulsion 20% to 1.5, acrylic emulsion BMP-3 20% to 17.6, the variance MH-30 20% - 23.5 and water - and the rest of the fixer [2].

A disadvantage of known methods is that they do not provide a coating on the skin with high resistance to repeated bending and wet friction.

The technical result of the invention is to improve the quality of the coating on the skin.

This result is achieved in that in the method of finishing by successive application of pigmented ground-based polymer film-forming agent, pigmentaria and water, surface-based paint pigmented concentrate, polymeric film-forming agent, additives, and water, and fixer, as the film-forming polymer in pigmented soil using aqueous dispersion of a copolymer of methacrylate, butyl acrylate, 2-ethoxyethylacetate and methylacrylamide in the ratio 30:30:38:2 (Gramos 702) in the following ratio of components depigmenting is alacrimia in the ratio 30:30:38:2 (Gramos 702) 20%-Naya - 35,0 - 45,0

The penetrator - 4,0 - 5,0

Water - the Rest

but as the film-forming polymer in the coating paint, a mixture of aqueous dispersions of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio 30:30:38:2 (Gramos 702) and aqueous dispersion of polyurethane (Ikatan 1250) in the following ratio of components, coating paint, wt.%:

Pigment concentrate - 15,0 - 20,0

Aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio of 30:20:38:2 (Gramos 702) 20% - 20,0 - 30,0

Aqueous dispersion of a polyurethane (Ikatan 1250 NF) 40% - 25,0 - 35,0

Supplements - 15,0 - 20,0

Water - the Rest

The introduction of the non-pigmented primer and top coat paint as a polymeric film-forming aqueous dispersions of Gramos 702, containing not only carboxyl groups but also reactive methyl and amide groups, in combination with the aqueous PU dispersion in coating paint, promotes strong binding of these film-forming agents among themselves and with the functional groups of the protein of the skin, which improves the quality of finish and to improve operational properties of the coating on the skin.

Synthesis of dispersion Gramos 702 carried out by the method of emulsion polymerization. Duration dosage monomers is 4.0 to 4.5 h at 60-65oC. Loading monomers produced in the following sequence: at the beginning of introducing methyl acrylate, butyl acrylate and 2-ethoxyethylacetate. Through a 2.0-2.5 hours from the start of the synthesis add methylacrylamide. The ratio of monomers in the copolymer is 30:30:38:2.

The composition of the non-pigmented soil is prepared as follows: 20% water dispersion of Gramos 702 sequentially mixed with the penetrator and water. The resulting mass is thoroughly mixed.

The composition of the coating paint is prepared as follows: 20% water dispersion of Gramos 702 mixed with 40% aqueous dispersion of PU. In the resulting mass gradually with careful stirring of the pigment concentrate, additives and water.

The specific formulations of non-pigmented soil and pokrivac chrome tanning with a polished outer surface. Consumption of soil 150-180 g/m2. After vacuum drying to the skin is applied coating paint of the composition, further pressed, fix the following composition, wt.%: Icalc S 83 - 50 and butyl acetate - 50 (for shiny skin) or Icalc S 83 - 25, Icalc SMF - 25 and butyl acetate - 50 (for dull skin) and again pressed.

The test results of physical-mechanical properties of coatings on the skin are given in table.2.

Using the proposed method of finishing will allow you to get coverage on the skin with high performance properties.

Method of finishing by consecutive application of non-pigmented ground-based polymer film-forming agent, a penetrator and water, coating paint-based pigment concentrate, a polymeric film-forming agent, additives, and water and fixer, characterized in that as the film-forming polymer in non-pigmented soil using aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio 30 : 30 : 38 : 2 in the following ratio of components, non-pigmented soil, wt.%:

Aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and mew as a polymeric film-forming agent in the coating paint, a mixture of aqueous dispersions of a copolymer of methyl acrylate, of butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio 30 : 30 : 28 : 2 and the water dispersion of the polyurethane in the following ratio of components, coating paint, wt.%:

Pigment concentrate - 15,0 - 20,0

Aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylolacrylamide in the ratio 30 : 30 : 28 : 2 (20%-Naya) - 20,0 - 30,0

Aqueous dispersion of a polyurethane (40%) - 25,0 - 35,0

Supplements - 15,0 - 20,0

Water - Ostalnoe

 

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1 tbl, 15 ex

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1 tbl, 6 ex

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1 dwg, 1 tbl

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