Way to finish genuine leather

 

The method relates to the finishing of natural leather and can be used in the production of leather for the uppers, and clothing and haberdashery leather with multi-color decoration. The semi-finished product from the skins of cattle subjected to drying, two taike with intermediate drying. Then moisturize and on the flesh side of the skin cause the fat emulsion which is then subjected to a breakdown in the drum and stretching on the frame of the dryer. Put pigmented primer with pre-pressing and double application of the coating paint with intermediate pressing. Top coat paint contains pigment concentrate, liquid dye, polymer binders, additives and water. Floor fix and put a top coat of contrasting paint, pressed and put on a coating of ethyl alcohol. After that, the floor is fixed, pressed the mirror plate, fix again and pressed. The technical result is the expansion of the range of skins for different purposes. table 1.

The invention relates to the leather industry and can be used in the production of leather for the uppers, and clothing and haberdashery with polychrome decoration.

Known Spasenie on the facial skin surface fat coverage and pressing /EN, 2096474 C1, CL 14 With 13/00, 20.11.97/.

The disadvantage of this method is that it does not allow the skin with high strength properties of the surface layer.

The closest analogue of the proposed technical solution is the method of finishing of leather, including drying, double Taiko with intermediate drying, triple grinding, application of a fatty coating in two stages with an intermediate extrusion and drawing colouring emulsion composition of the following composition, wt.%: polyurethane dispersion 8.0 to 9.5, matting agent 4,0-12,0, Grif-additive 5,5-8,0, wax emulsion of 5.0-9.5, liquid dye 3,0-4,0 and water the rest /EN, 2128232 C1, CL 14 With 13/00, 11/00, 27.03.99/.

The disadvantage of this method is that it does not allow elegant, eye-catching leather with multicolor decoration.

The technical result of the invention is the expansion of the range of skins for different purposes.

This result is achieved by way of the finish of genuine leather is drying, two taike with intermediate drying, humidifying, causing the fat emulsion on the flesh side of the skin, the breakdown in the drum, stretching on the frame of the dryer, causing pigmentirovannoy concentrate 8,0-10,0, liquid dye 2,5-3,5, polymer binders 35,0-40,0, additives 6.5 to 9.5 and water the rest, with intermediate pressing, pre-fixing of the coating, applying a contrast coating paint, pressing, drawing on the floor of ethyl alcohol, binding, pressing the mirror plate, the final consolidation and final pressing.

A distinctive feature of the proposed method is that the application of the fat emulsion on the flesh side of the skin, coats pigmentirovannogo soil, coating paint of the claimed composition, contrast coating paint and ethyl alcohol with their subsequent consolidation, in combination with operations split in the drum, stretch marks on the frame of the dryer and pressing the mirror plate allow you to get elegant, eye-catching leather with multicolor finish and high performance.

Contrasting top coat paint has the same qualitative and quantitative composition, the basic paint, except for the color of its member pigment concentrate and liquid dye. To create the effect of polychromy pigment concentrate and liquid dye in contrasting paint should be a darker color than the main. Such is akritiy brown, in contrast opaque dye is injected pigment concentrate and liquid dye, dye coating in black color and so on

The compositions of the coating paint and contrasting coating paint is prepared as follows: into a mixer equipped with a stirrer, injected polymer formers, carefully mixed, the resulting mass with constant stirring injected pigment concentrate, liquid dye, additives and water.

The introduction of the pigment concentrate and liquid dye less than 8.0 and 2.5 wt.% accordingly not possible to obtain uniformly and intensely colored compounds the main and contrasting coating paint. Introduction more than 10.0 and 3.5 wt.% it is impractical. Introduction polymeric film-forming agents and additives less 35,0 and 6.5 wt.% accordingly not possible to obtain a coating on the skin with high performance properties, the introduction of more 40,0, and 9.5 wt.% creates difficulties in the application of paints to the surface of the skin because of their high viscosity.

The method is as follows Semi-finished product obtained from the skins of cattle by known techniques, is subjected to drying in a vacuum dryer to a moisture content of 30-35%, the hides, two taike with intermediate drying up the volume movement in the drum and stretching on the dryer frame N-20. After that, the skin is applied pigmented primer, pre-press and twice with intermediate pressing is applied coating paint of the following composition, wt. %: pigment concentrate 8,0-10,0, liquid dye 2,5-3,5, polymer binders 35,0-40,0, additives 6.5 to 9.5 and water the rest. The coating obtained is fixed and put on him a contrasting top coat paint. After pressing on the skin manually swab put the ethyl alcohol, and then produce a consolidation and pressing of the skins of the mirror plate, the final stipulation and final pressing.

Example 1. The semi-finished product obtained from the skins of cattle by known techniques, is subjected to drying in a vacuum dryer to a moisture content of 30-35%, the hides, two taike with intermediate drying to a moisture content of 20-25% and hydration. Then the Assembly map on the flesh side of the leather put the fat emulsion of the following composition, wt.%: Perfecta UKB - 67,0, water - 33,0, are broken down in the drum and stretching on the dryer frame N-20. After that, the skin is applied pigmented primer, pre-press and twice with intermediate pressing is applied coating paint of the following composition, wt. %: pigment concentrate brown 8,0, liquid krasiteli 10% 4,0, water 47,0. The coating obtained is fixed and put on him a contrasting top coat paint of the following composition, wt.%: pigment concentrate black 8,0, liquid dye black 3.5, polyurethane dispersion EN 3925 20,0, acrylic dispersion BMP-3 15,0, wax emulsion 20% 2,5, casein 10% 4,0, water 47,0. After pressing on the skin manually swab put the ethyl alcohol, and then produce a consolidation and pressing of the skins of the mirror plate, the final stipulation and final pressing.

Example 2. The semi-finished product obtained by known techniques from the skins of cattle, treated as in example 1, but the flesh side of the skin cause the fat emulsion of the following composition, wt.%: Talon 4211 - 67,0, water - 33,0. Coating paint has the following composition, wt.%: pigment concentrate beige 9,0, liquid dye beige 3,0, acrylic dispersion Compound L-1 25,0, acrylic dispersion BMP-3 12,5, wax emulsion 20% to 3.0, casein 10% 5,0, water 42,5, and the contrast of the coating paint has the following composition, wt.%: pigment concentrate brown 9,0, liquid brown dye 3,0, acrylic dispersion Compound L-1 25,0, acrylic dispersion BMP-3 12,5, wax emulsion 20% to 3.0, casein 10% 5,0, water 42,5.

Example 3. Prefabricated, EMU skin cause the fat emulsion of the following composition, wt.%: Silanol R - 67,0, water - 33,0. Coating paint has the following composition, wt.%: pigment concentrate pink 10,0, liquid dye pink 2,5, polyurethane dispersion Ikatan 1250 30,0, acrylic dispersion of Gramos 702 10,0, filler Fi 242 3,5, casein 10% 6,0, water 38,0, and the contrast of the coating paint has the following composition, wt. %: pigment concentrate Burgundy 10,0, liquid dye Burgundy 2,5, polyurethane dispersion Ikatan 1250 30,0, acrylic dispersion of Gramos 702 10,0, filler Fi 242 3,5, casein 10% 6,0, water 38,0.

Example 4. The semi-finished product obtained by known techniques from the skins of cattle, treated as in example 1, but the coating paint has the following composition, wt.%: pigment concentrate brown 7,0, liquid brown dye 4,0, polyurethane dispersion EN 3925 19,0, acrylic dispersion BMP-3 16,0, wax emulsion 20% to 2.0, casein 10% 3,5, water 48,5, and the contrast of the coating paint has the following composition, wt.%: pigment concentrate black 7,0, liquid black dye 4,0, polyurethane dispersion EN 3925 19,0, acrylic dispersion BMP-3 16,0, wax emulsion 20% to 2.0, casein 10% 3,5, water 48,5.

Example 5. The semi-finished product obtained by known techniques from the skins of cattle, treated as in the beige 2,0, acrylic dispersion Compound L-1 31,0, acrylic dispersion BMP-3 9,0, wax emulsion 20% 4,0, casein 10% 6,5, water 36,5, and the contrast of the coating paint has the following composition, wt.%: pigment concentrate brown 11,0, liquid brown dye 2,0, acrylic dispersion Compound L-1 31,0, acrylic dispersion BMP-3 9,0, wax emulsion 20% 4,0, casein 10% 6,5, water 36,5.

Acrylic dispersion BMP-3 is a copolymer of methyl acrylate, butyl acrylate and methacrylic acid in a ratio of 62:35:3, acrylic dispersion of Gramos 702 is a copolymer of methyl acrylate, butyl acrylate, 2-ethoxyethylacetate and methylol-acrylamide in a ratio of 30:30:38:2.

Qualitative indicators of the skins as examples in comparison with the skin of the prototype presented in the table.

Using the proposed method allows to obtain elegant, colorful skin with a spectacular artistic finish and high performance.

Claims

Method of finishing of leather, which consists in drying, two taike with intermediate drying, humidifying, causing the fat emulsion on the flesh side of the skin, the breakdown in the drum, stretching on the frame of the dryer, causing pigmenter the p>

Pigment concentrate 8,0-10,0

Liquid dye 2,5-3,5

Polymer binders 35,0-40,0

Supplements 6,5-9,5

Water the Rest

with intermediate pressing, pre-fixing of the coating, applying a contrast coating paint, pressing, drawing on the floor of ethyl alcohol, binding, pressing the mirror plate, the final consolidation and final pressing.

 

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FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

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