The way of processing leather

 

(57) Abstract:

The invention relates to the leather industry and can be used in making leather for various purposes. The method consists in filling prefabricated water dispersion of a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 35-45 : 5-10 : 10-15 : 10-15 : 10-15 : 10-20 in the amount of 3.0 to 6.0% by weight of semi-finished and doublepane skin organic tanning agent. The method improves the quality of skin. table 1.

The invention relates to leather production, in particular by impregnation of the filling product, and can be used in making leather for various purposes.

A method of processing leather by filling their product 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, dyeing, fatliquoring and retanning organic tanning agent (RU, Patent 2112042, CL 14 With 9/00, 27.05.98).

The disadvantage of this method is that it does not allow the skin with high operational svoistvami simultaneous filling and retanning their aqueous solution of acrylic copolymer and sulphurating connection with their mass ratio of 1:0,5-0,7. 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 to 5.0% by weight of shaved leather (SU authorship 1752774 A1, class 14 With 3/22, 9/00, 07.08.92).

The disadvantage of this method is that it does not allow the skin with high consumer properties. The resulting skin is insufficiently filled, have a high hydrophilicity and low permeability.

The technical result of the invention is to improve the quality of the leather.

This result is achieved by a method for processing of hides, by filling their water dispersion of acrylic copolymer and retanning organic tanning agent, as the acrylic copolymer used is a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 35-45:5-10: 10-15:10-15:10-15:10-20, in the amount of 3.0 to 6.0% by weight of the semifinished product.

A distinctive feature of the proposed method is that the processing of skin water dispersion of acrylic copolymer-based, acrylamide, methacrylic acid, Acrylonitrile, mA the distribution of copolymer layers of the dermis and allows you to get the skin with high performance properties.

Technology of production of copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate is consistent emulsion copolymerization of these monomers in the stated proportions, in a reactor equipped with a stirrer. The synthesis was carried out at a temperature of 60-80oC. in an inert atmosphere with continuous stirring for 7-10 hours. The boot sequence components in the reactor: aqueous phase monomer acid monomers. The initiator is loaded when the planned temperature. When the polymerization according to the method specified in 3 hours reaches the degree of conversion of 90% or more. Continue to hold the process up to 10 hours necessary to achieve the content of residual monomer is less than 0.3%.

Experimentally established that the optimal ratio of comonomers: acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate is 35-45: 5-10:10-15:10-15:10-15:10-20. The use of copolymers with different ratios of these monomers is not possible to obtain elastic skin with high performance properties.

Administration of an aqueous dispersion E high consumer properties. Introduction more than 6.0% by weight of semi-finished product is impractical, so as to further improve the quality 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.

The content of the proposed method is carried out after neutralization (pH 4.5 to 5.0) copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio of 35-45: 5-10: 10-15:10-15:10-15:10-20 in the amount of 3.0 to 6.0% by weight of semi-finished product in a wet coefficient of 1.0 to 1.5 and a temperature of 40-45oC for 20-30 minutes. Then skin doublenaut organic tanning agent in the amount of 2-4% by weight of semi-finished product, counting on Tandy or tanning within 40-60 minutes.

Example 1. The semi-finished product obtained by standard methods from the skins of cattle, is subjected to neutralization with a mixture of formate and sodium bicarbonate, at a temperature of 45-50oWith and W.to. 2.0 V for 20 minutes, and fill the water dispersion of a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinylacetat is the atur 40-45oWith and W.to. 1.5 V for 40 minutes. Then skin doublenaut the Syntan BOPD in the amount of 2% by weight of semi-finished product, counting on tanning for 40 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 during the filling of the use of an aqueous dispersion of a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 40: 7,5: 12,5: 12,5:12,5:15 in the amount of 4.5% by weight of the semifinished product. Then skin doublenaut quebracho in the amount of 4% by weight of semi-finished product, counting on tanida, within 60 minutes. Further processes of dyeing, fatliquoring and finishing are carried out by standard methods.

Example 3. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but during the filling of the use of an aqueous dispersion of a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 45:5:10:10:10:20 in the amount of 6.0% by weight of the semifinished product. Then the skin on the processes of dyeing, the fatliquoring and finishing are carried out by standard methods.

Example 4. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but during the filling of the use of an aqueous dispersion of a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 32:11:16:16:16:9 in the amount of 6.5% by weight of the semifinished product.

Example 5. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 2, but during the filling of the use of an aqueous dispersion of a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 48:4:9:9:9:21 in the amount of 2.5% by weight of the semifinished product.

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

Using the proposed method allows to obtain supple leather with high performance properties.

Method of treatment of skin by filling their water dispersion of acrylic copolymer and retanning organic dwai acid, nitrile of acrylic acid, maleic anhydride, vinyl acetate and butyl acrylate in a ratio, respectively, 35-45 : 5-10 : 10-15 : 10-15 : 10-15 : 10-20, in the amount of 3.0 to 6.0% by weight of the semifinished product.

 

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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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