Way of finishing the sheepskin

 

(57) Abstract:

The method is used for the finishing of leather for production of headwear from the skins of sheep. The leather trim is implemented by applying the dye water-based composition, applying the fixer and pressing. Before applying the dye water-based compositions on boterman the surface of the sheepskin put fat coating and produce stretching sheepskin. Applying coloring latex compositions and fixer produce boterman surface. As latex coloring composition using the following composition: polyurethane dispersion, matting agent, Grif-additive, wax emulsion, liquid dye and water. The method improves the quality of leather from sheepskin. table 2.

The invention relates to the leather industry and can be used for finishing leather for the production of headwear from the skins of sheep.

The closest analogue of the proposed technical solution is the way of finishing the sheepskin, which includes grinding botermans surface, application of a non-pigmented primer on the front surface of the sheepskin, extrusion, coating pigmented g is th) 5, wax emulsion (20%) 2, alizarin oil 0.5, variance MH-30 (20%) 20,5, acrylic emulsion of BMP-3 (20%) 20,5, water, rest, application of the fixer and pressing. [1]

The disadvantage of this method is that it does not allow to obtain high-quality leather, sheepskin to produce hats, having on the front surface of the hair.

The technical result of the invention is to improve the quality of the leather.

This result is achieved by the fact that in the way of finishing the sheepskin, including the application of coloring water-based compositions, the application of the fixer and pressing, before applying the dye water-based compositions on boterman the surface of the sheepskin in addition put fat coating and produce stretching of sheepskin, application of dye emulsion composition and fixer produce boterman surface, and as a coloring emulsion composition uses the following composition, wt.%:

Polyurethane dispersion - 6,0 - 10,0

Matting agent - 10,0 - 15,0

Grif-additive - 6,0 - 10,0

Wax emulsion - 8,0 - 11,0

Liquid dye - 2,0 - 4,0

Water - the Rest

Additional grease and, containing, by weight. %: polyurethane dispersion 6,0-10,0, matting agent 10,0-15,0, Grif-additive 6,0-10,0, wax emulsion 8,0-11,0, liquid dye 2,0-4,0 and water the rest, and fixer on boterman surface allows to obtain the sheepskin to produce hats with high performance properties.

Introduction to environmental water emulsion composition (wt.%) polyurethane dispersions less than 6.0, matting tools below 10.0, Grif-additive less than 6.0, the wax emulsion is less than 8.0, liquid dye less than 2.0 and more water 68,0 not possible to obtain a uniformly colored skin with high performance finishes.

Introduction to water-based coloring composition (wt.%) polyurethane dispersion more than 10.0, matting means more than 15,0, Grif-supplements more than 10.0, wax emulsions more 11,0, liquid dye greater than 4.0 and less water 50,0 yields a viscous composition, applying to the skin difficult.

The method is as follows.

On boterman the surface of the skin, derived from the skins of sheep by known techniques with preservation of hair, put the fat coating. Popular fat 150-250 g/m2. Then sheepskin th water-based coloring composition of the following composition, wt.%:

Polyurethane dispersion - 6,0 - 10,0

Matting agent - 10,0 - 15,0

Grif-additive - 6,0 - 10,0

Wax emulsion - 8,0 - 11,0

Liquid dye - 2,0 - 4,0

Water - the Rest

After that, the unit map on boterman the surface of the skin at the rate of 80-100 g/m2put a coat of the following composition, wt.%:

The nitrovarnish SC 573 - 20 - 26

Butyl acetate - 65 - 70

Muttlak II/422 - 6,5 - 7,0

NM 132 - 2,0 - 3,5

Coloring latex composition is prepared as follows: polyurethane dispersion is mixed with water, then with constant stirring add a matting agent, a neck-additive, a wax emulsion and liquid dye.

The fixer get a consistent mixture of listed components.

Then the sheepskin is pressed, measure space, sorting and packing.

Specific examples of compositions for finishing the sheepskin is presented in table. 1.

The results of skin tests are presented in table. 2.

Using the proposed method allows to obtain the sheepskin to produce hats with high performance properties.

Way of finishing the sheepskin, including the application of coloring Easypayday latex composition on boterman the surface of the sheepskin in addition put fat coating and produce stretching sheepskin, applying coloring latex compositions and fixer produce boterman surface, and as a coloring emulsion composition uses the following composition, wt.%:

Polyurethane dispersion - 6,0 - 10,0

Matting agent - 10,0 - 15,0

Grif-additive - 6,0 - 10,0

Wax emulsion - 6,0 - 11,0

Liquid dye - 2,0 - 4,0

Water - The Rest

 

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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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