SU859454A1 - Method of leather treatment - Google Patents

Description

I

The invention is based on leather technology, namely, the process of retanning and filling of leather.

A method of treating leather is known, which includes retarding and filling a sliced semi-finished product with melamine-formaldehyde resin and subsequent processing with salts of chromium, zirconium, aluminum or titanium p.

The disadvantage of this method is that it does not provide sufficient whiteness of the skin surface, the stability of whiteness in time.

The purpose of the invention is to improve the quality of white and light skin and the stability of the whiteness of their surface over time.

This goal is achieved in that the method of treating leather is carried out by retanning and filling the sliced semi-finished product with melamine-formaldehyde resin, followed by treatment with chromium, zirconium, aluminum or titanium salts,

The filling and filling is carried out with a melamine formaldehyde resin containing a chemically bound bleach at 30-65 ° C for 1.0-1.5 hours.

Example 1. Semi-finished product from the hides of cattle goby after chrome tanning and gouging. The mass of planed semi-finished product is 600 kg.

The semifinished product is washed in flowing water in a drum at 30–35 ° C for 30–40 min. Next, 480 liters of water are poured into the drum (liquid ratio — g / h 0.8) with a temperature of 60-65 ° C. Loaded dry 9 kg

15 1 sodium bicarbonate (1.5 by weight of the skins), 9 kg of dispersant NF (l, 5% by weight of the skins) and after 10 minutes of rotation along the drum, pour a fat emulsion of 33 kg of fat (5.5% of the weight skins), counting on pure fats.

The drum is rotated for 1 hour, after which 30 kg are loaded through the hatch into the drum.

a powdery modified melamine formaldehyde resin containing a chemically bound bleach (5% by weight of the leather. After 1 h of rotation, 24 kg liter of oak zirconium or titanium salt (.1% Ft of the mass of leather, calculated as dioxide) is loaded into the drum and the process continues 0 , 5 h.

Example 2. The mass of planed semi-finished product is 600 kg. All processes, including neutralization and washing after neutralization, are carried out according to typical methods for the production of chrome leather for the upper of the shoe. Next, water is poured into the drum with a temperature of 35–40 ° C in an amount of 600 l. for a chew, a drum is added with 600 l of water with a temperature of 60-65 ° C and 33 kg of fat (5.5% by weight of the skin) in the form of an emulsion are on the drum’s run. pitch in an amount of 30 kg (5% vol. of the mass of leather) b for an hour, after which oak is loaded into the drum 24 grams of 1ch salt of salt or titanium

1% of the mass of the skin, counting on Dioxide) and continue the process 0.5 hours

Example 3. Weight planed semi-finished product OO kg. 900 liters of water (g.k., 1.5), 9 kg of dispersant NF (1.5% by weight of skins) or 6 kg of surfactant (l% by weight of skins) and the enemy are poured into the drum and shield the drum for 45 minutes. This is followed by washing on running water at 35-40 С

within 40 min. Neutralization and greasing are carried out in combination, for which 600 l are poured into the drum. water (gk 1.0) with a temperature of 60-65 C, load 9 kg of bicarbonate (1.5% of

5 mass of the skin) and after 10 minutes in the course of the drum load 33 kg of fat (5.5% of the mass of the skin, counting on pure fats) in the form of an emulsion. Processing time h

. After neutralization-fattening is completed, J3p kg of powdered modified melamine-formaldehyde resin (5% by weight of the leather) is loaded through the hatch through the hatch. After 1 h of rotation, treatment with tanning salts of zirconium or titanium follows, for which 24 kg (1% of the mass of leather, considered uia oxide) is loaded into the drum and the process continues for 0.5 h.

A number of technical and economic indicators nq known method and the proposed table.

51,437,498

76,272,1166

, 876.4174

80,178,3169

464

6.9

3889.4

37910.1

367 11.7

58594544

Thus, the proposed method titan, characterized in

allows you to dramatically increase the whiteness of something that, in order to improve the quality of the beveriness of the skin, which does not change the light and light skin and stability

over time, significantly increase the whiteness of their surface over time,

Claims (1)

Adhesion of the coating to the skin, increase 5 retardation and filling carried out the grindability of the semifinished product. Metamine formaldehyde resin, the claims of the invention within 1.0-1.5 hours. The method of treating leathers by means of retanning in vanity and filling of the sliced melamine-formaldehyde semifinished product1. Dressing leather. Ed. IP Strasmola with the subsequent processing of sokhov, M., Lesna Industri, 1976, l of chromium, zirconium, aluminum or 5 p. 168 (prototype). containing chemically bound from 6ejfflBaTejib at a temperature of 30-65 ° C in Q Sources of information