The method of manufacture of furs

 

(57) Abstract:

The invention relates to chemical treatment of fur skins and can be used in the processing of sheepskin and fur raw materials. Fur skins subjected left lying treated with a solution of sodium chloride, organic acids, surfactants and sodium thiosulfate. Then carry out the tanning chrome tanning agent in the amount of 0.67 0.85 per cent by weight of the skins in terms of oxide of chromium (III). The tanning agent obtained by dissolving in sulfuric acid chromechrome in a molar ratio of chromium oxide (III) and chromium oxide (VI), is equal to 0.8 to 1.2, to full dioxolane and geological chromium (III) and subsequent reduction of chromium (VI) and adjust the basicity of the tanning agent the sodium dichromate or potassium. Left lying processing is carried out in the presence of dimethyl sulfoxide. Tanning can also be performed in the presence of dimethyl sulfoxide. The method allows to provide a high quality semi-finished product by reducing shrinkage in area, hardening due hair with the dermis, as well as increasing viviremos tanning material from the treatment solution. 2 C. p. F.-ly, 1 table.

The invention relates light industry, namely to the chemical processing of fur skins and can the of fur skins using slightly basic chrome tanning agent in the presence of sodium chloride, acetic acid /auth. St. USSR N 931745, C 14 C 3/06/.

The closest analogue of the claimed invention is a method of tanning fur skins by treatment with a solution of sodium chloride, acids, surface-active agent /surfactant/, sodium thiosulfate, sodium carbonate and chromium tanning agent, the concentration of which in terms of Cr2O31.6 g/l at a liquid rate /LCD/ equal to 9 or 1.44% by weight of the skins. However, the duration of treatment ranges from 8 to 24 hours / single processing technology of rabbit, M, Createrepo, 1990, S. 20 - 24/.

The disadvantage of this method is the significant shrinkage of the material after tanning, insufficient bonding strength of the hair with the dermis, as well as low processing of chrome tanning agent.

The aim of the proposed method is to reduce the shrinkage fur semi-finished product area, strengthening ties hair with the dermis, as well as improving the processing of chrome tanning agent.

This goal is achieved by the fact that as a tanning agent used chrome tanning agent obtained on the basis of chromechrome with a molar ratio of chromium oxide(III) and chromium oxide (VI) 0,8 - 1,2 dissolved in sulfuric acid to complete dioxole the dichromate sodium or potassium, the consumption of tanning agent is 0.67 0.85 per cent by weight of the skins. Left lying and tanning treatment is carried out in the presence of dimethyl sulfoxide (DMSO) in an amount of 0.2 - 0.8% and 2.5 to 5.0% by weight of the skins.

This treatment leads to a reduction in shrinkage fur semi-finished product after tanning, strengthening ties hair with the dermis, in addition with reduced almost twice the consumption of the tanning agent is reduced processing time, increased development of the tanning agent.

The use of dimethyl sulfoxide in an amount of 0.2 to 0.8% by weight of the skins in the process are left lying preparation allows to improve the conditions of flow of the subsequent tanning, and use of dimethylsulfoxide at the stage of preliminary dissolution of the tanning agent 5 - 10 times the amount of water at a temperature of 35 - 40oC, facilitating the formation of solvatochromism chrome tanning increases the ability of chrome tanning agent.

Distinctive features of the proposed method are:

- use a new tanning agent that does not contain accelerandi and olifirovich compounds chromium (III),

the creation of specific conditions of use DMSO for the manifestation of his penetrating properties during pridubil the rum tanning agent.

This combination of features allows you to improve quality indicators fur semi-finished product by reducing shrinkage in area, hardening due hair with the dermis, the consumption of chrome tanning agent to reduce by almost two times, and the duration of the process up to 4 - 5 hours.

The technology of the method is as follows.

A: soaking off and pickling fur raw materials carried out by the method of the nearest equivalent.

Tanning is carried out in the drum when the LCD 9, a temperature of 40 - 42oC

Left lying preparation is carried out for 2 hours in a solution containing, g/l:

Sodium chloride - 50

Surfactant (neinogennye) - 1

Sodium thiosulfate - 8

Organic acid - 10

DMSO take in the amount of 0 to 0.8% by weight of the skins.

One hour after boot skins adjust the pH cut the leather to 3.8 to 4.1 solution of sodium carbonate. After two hours from the beginning of the process, introduce a solution of the tanning agent, which is prepared beforehand by dissolving the necessary amount of tanning agent 0,67 - 0,85 from the mass of skins and DMSO 0 to 5% by weight of the skins in 5 - 10 times the amount of water at a temperature of 32 - 40oC. Tanned finish after 4 to 5 hours. Prefabricated unload and leave on 1. The method of manufacture of furs, including left lying processing solution of sodium chloride, organic acids, surfactants, sodium thiosulfate and tanning, characterized in that the tanning carry out the chrome tanning agent in the amount of 0.67 0.85 per cent by weight of the skins in terms of oxide of chromium (III), obtained by dissolving in sulfuric acid chromechrome with a molar ratio of chromium oxide (III) and chromium oxide (VI), is equal to 0.8 to 1.2, to full dioxolane and geological chromium (III) subsequent recovery of chromium (VI) and adjusting the basicity of the tanning agent the sodium dichromate or potassium.

2. The method according to p. 1, characterized in that left lying processing is carried out in the presence of dimethyl sulfoxide in an amount of 0.2 to 0.8% by weight of the skins.

3. The method according to p. 1, characterized in that the tanning is carried out in the presence of dimethyl sulfoxide in an amount of 2.5 to 5.0% by weight of the skins.

 

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SUBSTANCE: method comprises pickling, tanning, and neutralizing the semifinished item. During pickling and subsequent tanning, the picking liquid is provided with acetate sodium in amount of 0.2-0.5 % and, then, chromic tanner in amount of 1.5-1.8%. The tanning is carried out until the pH of the solution reaches 4.2-4.4.

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2 tbl

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2 cl, 1 tbl, 9 ex

FIELD: chemistry, hide tanning.

SUBSTANCE: method relates to tanning hides and can be used in the leather industry. Animal hides are treated with a solution of chrome tanning agent with addition of an activating organic agent in form of aminocapronic acid at concentration of 8-12 g/l.

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5 ex

FIELD: process engineering, leather industry.

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2 tbl, 3 ex

FIELD: chemistry.

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2 cl, 3 tbl, 5 ex

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29 dwg, 6 tbl

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