Method of finishing

 

(57) Abstract:

The method is used in the manufacture of special types of leather with an oily finish from the skins of cattle. The finish of the leather is realized by means of drying, double grave with intermediate drying, the deposition of fat covering and pressing. Before applying the fatty covering of the skin is subjected to three-time grinding. The application of the fat coating is produced in two stages with an intermediate pressing, and then on the skin caused water-based coloring composition of the following composition: polyurethane dispersion, matting agent, Grif-additive, wax emulsion, liquid dye and water. The method allows to increase quality leather with an oily finish. table 2.

The invention relates to the leather industry and can be used in the manufacture of special types of leather with an oily finish from the skins of cattle.

The known method separate skins, including drying, moisturizing, double Taiko with intermediate drying, two-sanding, applying a sealing of the soil, the third grinding, extrusion and coating dyeing [1].

The disadvantage of this method is that it does not allow phom proposed technical solution is the way to finishing, including drying, aging, triple Taiko with intermediate podarkami, causing the fat coating at the rate of fat 200-300 g/m and pressing [2].

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

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

This result is achieved in that in the method of finishing, including drying, double Taiko with intermediate drying, application of a fatty coating and extrusion, before applying fat cover skin additionally subjected to three grinding, application of the fat coating is carried out in two stages with an intermediate pressing, after which the skin is additionally applied water-based coloring composition of the following composition, wt.%:

Polyurethane dispersion - 8,0 - 9,5

Matting agent - 4,0 - 12,0

Grif-additive - 5,5 - 8,0

Wax emulsion - 5,0 - 9,5

Liquid dye - 3,0 - 4,0

Water - the Rest

Holding three grinding skin, causing oily coating in two stages with an intermediate extrusion and subsequent application of coloring water emulsion HDMI emulsion - 5,0-9,5; liquid dye - 3,0-4,0 and water - the rest, lets get the skin with high performance properties and beautiful appearance.

Introduction to water-based coloring composition (wt.%) polyurethane dispersions less than 8.0, matting means less than 4.0, the vulture-supplements less than 5.5, the wax emulsion is less than 5.0, liquid dye less than 3.0, and more water 74,5 not possible to get the skin with high strength properties of the front surface and beautiful appearance. Introduction to water-based coloring composition (wt.%): polyurethane dispersion over 9.5, matting means greater than 12.0, Grif-supplements above 8.0, the wax emulsion is more than 9.5, liquid dye greater than 4.0 and less water 57,0 yields a viscous composition, applying to the skin difficult.

The method is as follows.

Leather obtained from the skins of cattle by known techniques, dried in a vacuum dryer to a moisture content of 30-35% and a temperature of 70-75oC, dried in a free state to a moisture content of 20-25% and send the hides are not less than 8 hours. Then the skin is subjected to tajke 1, drying in a free state to a moisture content of 17-20%, taike 2 and three-time grinding. After this the and 100-150 g/m2at each stage. Then the skin on the Assembly map is applied coloring water emulsion composition comprising, in 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. The flow rate of the composition 120-140 g/m2, after which the skin is pressed on a press pass famosa, measure the area subjected to sorting, labeling and packaging.

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.

Specific examples of compounds for finishing are presented in table. 1.

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

Using the proposed method allows to obtain leather for Shoe upper with an oily finish with high performance properties and beautiful appearance.

Method of finishing, including drying, double Taiko with intermediate drying, application of a fatty coating and extrusion, characterized in that before applying the fat cover skin additionally subjected to the m then, on the skin in addition put water-based coloring composition of the following composition, wt.%:

Polyurethane dispersion - 8,0 - 9,5

Matting agent - 4,0 - 12,0

Grif-additive - 5,5 - 8,0

Wax emulsion - 5,0 - 9,5

Liquid dye - 3,0 - 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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