SU885265A1 - Method of leather tanning - Google Patents

Description

(54) METHOD FOR BORING OF THE SKIN

I

The invention relates to the leather industry and can be used in the development of leather, for example, footwear and shoe leathers.

There is a method of tanning leathers with the use of mineral tanning agents, tanning salts of chromium, followed by tanning and syntanes of GP.

The disadvantage of this method is the relatively low quality of the skin, the high cost and scarcity of vegetable tanning agents, and the contamination of waste water.

The closest in technical essence and achievable effect to the proposed is a method of tanning leather, which includes treating a mole with a solution of mineral tanning salts followed by basifying the solution with a mixture of sodium sulfite and urotropine, neutralizing the semi-finished product and modulating it with syntanes 2,

The disadvantage of this method is a significant consumption of tanning salts.

The purpose of the invention is to increase the temperature of welding the semi-finished product and reduce the consumption of tanning agents.

This goal is achieved by the fact that, in the method of tanning leather, includes treating a grill with a solution of mineral tanning salts followed by alkalizing the solution with a mixture of sodium sulfite and urotropine, neutralizing the semi-finished product and beating it

JJ sintanes, pr-and alkalization, ethylenediaminetetraacetic acid disodium salt is additionally introduced into the tanning solution in an amount of 0.050, 08% by weight of a mole, and a mixture of ammonium sulfate ammonium titanium alum or ammonium sulfate or ammonia or ammonia ammonium ammonium dimers is used.

Example I. The base of the mill is easily demolished (without pickling and chrome plating) and treated with ammonium sulfate titanylate solution at a rate of 4% of the mass of a mass mole, calculated on titanium dioxide, and 1.5% aluminum alum, counting on aluminum dioxide, in the presence of ammonium sulfate in an amount of 6% and sulfuric acid in the amount of 0.4% (in terms of monohydrate) at Zh.K. 0.8-1.0 for 32 hours, at the end of the tanning process, alkalization is carried out with sodium sulfite and hexamine, 1% each. In the alkalization process, disodium ethylenediaminetetraacetic acid (Trilon B) is added in an amount of 0, B7 by weight of the mole, after which the alkalization process lasts 2 hours, the spent bath is completely drained. The spent solution in the variant with Trilon B contains, g / l titanium dioxide 2 aluminum oxide 2.3 in the control variant (without Trilon B) - dioxide-titanium 9.5; alumina dioxide 5.0.

The neutralization process is carried out in fresh water in the same drum with the LC. 1.1 for 6 h, while on. Neutralization is consumed: sodium sulfite in an amount of 2%, hexamine 1% by weight mole. Then follows the process of titan retanning.

Synthesis retardation is carried out in fresh water in the same drum at J.K. 1.2 within 24-30 hours

At the same time, the consumption of dubbers is 12% by weight a mole, a bouquet of tanning agents has the following composition,%: No. 1 25 out of 50; No. 2 25. The consumption of sulfated slugging and sodium sulphite is 1% by weight of mole.

The subsequent fattening process and. Further processing is carried out according to the standard procedure of chrome tannid tanning for saddle leather.

EXAMPLE 2: The golye bychina is degraded after debinding and softening without pickelling and chrome plating is treated with ammonium sulfate titanylate solution at a flow rate of 2% by weight a gram, calculated on the amount of titanium dioxide in the presence of ammonium sulfate in the amount of 6% and sulfuric acid in the amount 0.4% (in terms of monohydrate t) at J. K. 0.8-1.0 for 6 hours. After penetration of titanium

Sodium sulfate or sodium ammonium sulfate or ammonium sulfate is added to the tanning solution in an amount of 2% (in terms of zirconia, by weight, mol and treated for

14-16 h. 1.5-2 h before the end of treatment with sodium sulfate or ammonium sulfate ammonium is made alkaline with sodium sulfite

and urotropin to 0.5% by weight of mole.

In the process of alkalizing, disodium salt of ethylenediaminetetraacetic acid (Trilon B) is added to tanning solution in an amount of 0.05%

from the mass of the mole, after this the alkalization process lasts 2 hours, the spent solution is completely drained.

The neutralization process is carried out in fresh water in the same drum at

J.K. 0.8-1.0 for 4-6 h, while the consumption of sodium sulfite - in the amount of 1%, hexamine 1.5% by weight mole.

The retardation of synthetic tanning agents (syntans) is carried out in fresh water in the same drum during the J.K. 1.2 for 24-30 hours. Consumption of syntans is 6-7% by weight mole. Composition oak oak,%: № 2 30; No. I 30; outside 40.

All further subsequent, drying processes and operations are carried out according to a typical method for the production of footwear, except for the fact that, when fattening, aluminum alum is added in an amount of 1.5% of the mass of the mole.

The treated solution in the variant using Trilon B contains titanium dioxide 1.52 g / l, zirconia 1.38 g / l, and in the control variant (without Trilon B) contains: t titanium dioxide 5.8 g / l, zirconia 5, i g / l.

The proposed method of tanning leather provides full penetration and binding to the collagen of tanning particles, while increasing the welding temperature of the semifinished product.

The temperature of the semifinished product welding after neutralization in the variant with and without the use of ethylene diamine: ethyl acetate (trylon B) disodium salt is given in the table.

Tanning techniques

Titanium aluminosintan (.example 1}

Titanium Zirconium Sintane Application 2)

The economic effect in the implementation of the proposed method of tanning will be 5.2 thousand rubles. on 1 million square meters ready skin.

Claims (2)

1. A method of tanning leathers, which includes treating a salt with a solution of mineral tanning salts followed by basifying the solution with a mixture of sodium sulfite and hexamine, neutralizing the semi-finished product and modulating it with syntans, characterized in that, in order to increase the temperature of the semi-finished product, weld the tannins and reduce the consumption of tanning agents when the base is used; tanning solution is additionally introduced ethylenediaminetetraacetic acid disodium in the amount of 0.05-0.08% by weight mole. Temperatures Experienced with I Control without T2ilons in JI2S22SS §. 83 84 89 90  2. The method according to p. L, .OTJiH4atoщ and with the fact that as a mineral, tanning salts are used. . ammonium sulfate mixture IS alum or sulphate. sodium zirconate or ammonia. Sources of information taken into account during the examination 1. Typical methods of production. skins for bubuvi glue, imitation screw and nail fastening methods, as well as skins for saddle-saddles JJ products of tromolactic duplex I from cattle and horse hazi. M., 1974. 2. Method of production of leather for the L bottom of the footwear of the thread and glue methods of fastening with the use of tanning zirconium compounds: and titia. M. . 1976.