The way we produce natural leather

 

(57) Abstract:

The invention relates to the leather industry and can be used in making leather for various purposes. The method includes chrome tanning, retanning semi-finished chrome tanning agent, neutralization in the presence of greasing emulsion in the amount of 1.5-2.0% by weight of cement, filling a copolymer of methacrylic acid and Acrylonitrile in a ratio of 40-60:40-60, retanning vegetable tanning agent, dyeing and greasing. The method can improve the consumer properties of the skin. table 1.

The invention relates to leather production, in particular for dyeing and greasing processes, and can be used in the formulation of the skins of different range and purpose of various types of raw materials.

A known method of manufacture of natural leather, including chrome tanning, retanning semi-finished chrome tanning agent, neutralization with volume ratio of 0.4-0.8 in the presence of ethoxylated fat 1.5 to 2.5% by weight of semi-finished product, counting for 100% fat, processed acrylic copolymer is the product of the saponification aqueous dispersion of polyacrylonitrile with the content of carboxyl Gruss 14 9/00, 27.05.98.)

The disadvantage of this method is that it does not allow the skin increased elasticity.

The closest analogue of the proposed technical solution is the way to develop natural leather, including chrome tanning, retanning semi-finished chrome tanning agent, neutralizing, filling an aqueous solution of acrylic copolymer in the presence of sulphurating connection with their mass ratio of 1:0,5-7,0, dyeing and greasing. Moreover, as the acrylic copolymer used is a copolymer of methacrylic acid and Acrylonitrile in a ratio of 40-60: 40-60 in the amount of 0.5-5% by weight of shaved leather (SU authorship 1752774 A1, class 14 With 9/00, 07.08.92).

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

The technical result of the invention is to improve consumer properties of the skin.

This result is achieved in that in the method of manufacture of natural leather, including chrome tanning, retanning semi-finished chrome tanning agent, neutralizing, filling a copolymer of methacrylic acid and Acrylonitrile in soothes the greasing emulsion in the amount of 1.5-2.0% by weight of cement, considering the 100% fat, and as an organic tanning agent used vegetable tanning agent.

A distinctive feature of the proposed method is that neutralised in the presence of fattening and vegetable tanning agent when doublepane semifinished product allows you to get soft supple leather with high consumer properties.

Introduction greasing emulsion in the amount of 1.5% in the neutralization process does not allow you to get filled with soft skin.

The introduction of a number of more than 2.0% is impractical because further improvement of consumer properties does not occur.

The method is as follows.

All processes and operations, including otlochno-ash, pregabalina tanning, conducted according to the standard method of production of leather for the uppers.

Then in the dryer load the material after retanning chrome tanning agent, washed with water at a temperature of 35-40oWith and carry out the neutralization mixture of formate and sodium bicarbonate in the presence of greasing emulsion in the amount of 1.5-2.0% by weight of semi-finished product, counting for 100% fat, W.to. 1.0 to 2.0 and a temperature of 35-40oC for 30-40 minutes. The axis of the nitrile of acrylic acid in the ratio of 40-60:40-60 in the amount of 2.0 to 6.0% by weight of semi-finished product for 30-40 minutes. Next prefabricated doublenaut vegetable tanning agent in the amount of 2.0 to 4.0% by weight of semi-finished product, counting on Tandy. Dying, greasing and finish of the leather is done according to standard methods.

Example 1. The semi-finished product obtained by standard methods from the skins of cattle, after retanning chrome tanning agent is subjected to washing, neutralizing the mixture of formate and sodium bicarbonate in the presence of greasing emulsion SMX-e TU 2484-013-222-84-995-99 in the amount of 1.5% by weight of the semifinished product, counting for 100% fat, at a temperature of 35-40oWith and W.to. 1,0 for 20 minutes and fill aqueous solution of a copolymer of methacrylic acid and Acrylonitrile in a ratio of 40-60:40-60 in the amount of 2.0% by weight of semi-finished product at a temperature of 40-45oWith and W.to. 1.5 V for 30 minutes. After that, prefabricated doublenaut vegetable tanning agent, Quebracho in the amount of 4.0% by weight of semi-finished product, counting on tanida, at a temperature of 40oC for 60 minutes. Further processes of dyeing, fatliquoring and finishing are carried out by standard methods.

Example 2. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but by neutralizing used fatten em the definition of the tanning agent used vegetable tanning agent Mimosa in the amount of 3.0% by weight of cement, counting on Tandy.

Example 3. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but the neutralization is carried out in the presence of greasing emulsion tramal with THE 2484-052-00302267-2000 in the amount of 2.0% by weight of semi-finished product, counting for 100% fat, and as an organic tanning agent used vegetable tanning agent, Quebracho in the amount of 2.0% by weight of semi-finished product, counting on Tandy.

Example 4. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but the neutralization is carried out in the presence of greasing emulsion SMX-e TU 2484-013-222-84-995-99 in the amount of 1.2% by weight of semi-finished product, counting for 100% fat.

Example 5. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 2, but the neutralization is carried out in the presence of greasing emulsion tramal with THE 2484-052-00302267-2000 in the amount of 2.2% by weight of semi-finished product, counting for 100% fat.

Qualitative indicators of finished leather, obtained by the proposed method and the method prototype, presented in the table.

Using the proposed method allows to get soft, supple skin with the consumption, retanning of semi-finished chrome tanning agent, neutralizing, filling a copolymer of methacrylic acid and Acrylonitrile in a ratio of 40-60: 40-60, retanning organic tanning agent, dyeing and greasing, characterized in that the neutralization is carried out in the presence of greasing emulsion in the amount of 1.5-2.0% by weight of semi-finished product, counting for 100% fat, and as an organic tanning agent used vegetable tanning agent.

 

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FIELD: tannery industry, in particular method for syntan (synthetic tanning material) production.

SUBSTANCE: claimed method includes diphenolepropane sulgation and condensation with formaldehyde followed by acidifying with sulfuric acid. Formed product is dispersed in lignosulfates containing 0.5-1.5 % of aluminum sulfate as calculated to aluminum oxide.

EFFECT: syntans with stable content of tanned materials: environmentally friendly and economical process.

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