The way we produce leather

 

(57) Abstract:

The method refers to the leather industry and can be used in making leather for various purposes. The method includes chrome tanning, processing of semi-finished copolymer of acrylamide, methacrylic acid and Acrylonitrile in a ratio, respectively 40-60:20-30:20-30 in the amount of 1-3% by weight of cement, the retanning chrome tanning agent and neutralizing. The method allows to increase the strength 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 various assortment and destination.

There is a method of generation of 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 groups 10-14% by weight of polymer in the amount of 3-4% by weight of semi-finished product, counting on the dry matter (RU, Patent 2112042 C1, CL 14 With the elastic properties.

The closest analogue of the proposed technical solution is the way to making skins, including chrome tanning, retanning semi-finished chrome tanning agent, neutralization and processing of aqueous solution of acrylic copolymer in the presence of sulphurating connection, when the mass ratio of 1:0,5-7,0. 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 consumer properties. The obtained skin hard to the touch, have a high hydrophilicity and low permeability.

The technical result of the invention is to improve the quality of skin by improving their mechanical properties.

This result is achieved in that in the method of manufacture of leathers, including chrome tanning, retanning semi-finished chrome tanning agent, neutralization and processing of acrylic copolymer, as the acrylic copolymer used is a copolymer of acrylamide, methacrylic who ikat and processing them spend before doublepane chrome tanning agent.

A distinctive feature of the proposed method is that as the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid and Acrylonitrile in a ratio of 40-60:20-30:20-30 with doublelayer and filling effect, therefore, the processing of semi-finished product specified copolymer before doublepane chrome tanning agent allows you to get ready skin with high strength properties.

The introduction of a copolymer of acrylamide, methacrylic acid and Acrylonitrile, with different ratios of monomers in addition to claimed, as well as introducing the copolymer is less than 1.0% by weight of semi-finished product, it is not possible to obtain elastic skin with high strength properties. The introduction of acrylic copolymer of more than 3.0% by weight of semi-finished product is impractical because of the further increase of the strength properties does not occur.

Copolymer of acrylamide, methacrylic acid and Acrylonitrile is produced by radical polymerization in a reactor of the type RAR-6/0,63, equipped with anchor stirrer, jacketed for temperature control and a pocket for a thermocouple. The boot sequence components in the reactor-polymerizaton: aqueous phase The method is as follows. To download drum chrome plated semi-finished product after shaving, pour water at a temperature of 35-40oWhen used well.to. 1,0-2,0 and make rinsing for 15-20 minutes Then a drum fill water at a temperature of 35-40oWith the calculation of W.to. 1.0 to 1.5, depending acrylic copolymer in an amount of 1.0 to 3.0% by weight of semi-finished product, considering the physical product, and processing of produce within 30-50 minutes then injected into the drum chrome tanning agent in the amount of 0.5-0.7% by weight of semi-finished product (including the chromium oxide) and produce retanning within 40-60 minutes

The subsequent processes of neutralization, dyeing, fatliquoring and retanning organic tanning agent carried out by well-known methods.

Example 1. The semi-finished product obtained by standard methods from the skins of cattle, is subjected to washing at a temperature of 35-40oWith and W.to. 2.0 V for 20 min, the processing of the copolymer acrilamide, methacrylic acid and Acrylonitrile in the ratio 40:30:30 in the amount of 1.0% by weight of cement, with 35-40oWith and W.to. 1.0 V for 30 min, doublepane chrome tanning agent in the amount of 0.5% by weight of semi-finished product (including the chromium oxide) for 40 min and neutralizing the mixture of formate and bipolarity, obtained by standard methods from the skins of cattle, are treated the same way as in example 1, but as the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid and Acrylonitrile in the ratio of 50:25:25 in the amount of 2% by weight of the semifinished product.

Example 3. The semi-finished product obtained by standard methods from the skins of cattle, are treated the same way as in example 1, but as the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid and Acrylonitrile in a ratio of respectively 60:20:20 in the amount of 3% by weight of the semifinished product.

Example 4. The semi-finished product obtained by standard methods from the skins of cattle, are treated the same way as in example 1, but as the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid and Acrylonitrile in a ratio of respectively 38:31:31 in the amount of 3.2% by weight of the semifinished product.

Example 5. The semi-finished product obtained by standard methods from the skins of cattle, are treated the same way as in example 1, but as the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid and the nitrile and the public performance of finished leather, obtained by the proposed method and the method prototype, presented in the table.

Using the proposed method allows to get ready skin with high strength properties.

The way we produce leather, which includes chromium tanning, retanning semi-finished chrome tanning agent, neutralization and processing of acrylic copolymer, characterized in that the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid and Acrylonitrile in a ratio, respectively 40-60: 20-30: 20-30 in the amount of 1-3% by weight of the semifinished product and process them spend before doublepane chrome 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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