The way we produce leather

 

(57) Abstract:

The method used for producing leather for various purposes. The semi-finished product is subjected to neutralization, dyeing and filling. Filling is performed by acrylamide in the amount of 0.5 to 3.0% by weight of semi-finished product, counting on dry residue, in the presence of potassium persulfate. The last charge in the amount of 0.1-0.5% by weight of the semifinished product. Then make processing of chrome tanning agent and greasing. The method allows to improve the quality of the leather. table 1.

The invention relates to chemical processing tanned semi-finished and can be used in the leather industry in the production of leather for various purposes.

There is a method of generation of leather, including simultaneous neutralization and filling of the semi-finished product by polyacrylamide mol. mass (4,5 - 5,5)106in the amount of 0.7 to 2.0% by weight of semi-finished product, counting on the dry matter, combined dyeing and treatment with glutaraldehyde in the amount of 1.4 to 4.0% by weight of semi-finished product, counting on the dry matter, and greasing [1].

The disadvantage of this method is that the use of polyacrylamide with a very high molecular weight is not possible to eliminate the detached spacecraft to the desired depth into the structure of the dermis. Excess polymer and glutaraldehyde in the surface layers of the skin leads to increased stiffness of the skin and does not contribute to the fixation of the dyes on the active centers of collagen, resulting in egalisatie coloring the surface of the skin.

The closest analogue of the proposed technical solution is the way to making skins, including the neutralization of the semi-finished product, combined dyeing process and filling the resin DAM-2c or DAM-MTELP, or self-proclaimed MFDC members-MTRP in the amount of 4% by weight of cement, greasing and processing of chrome tanning agent [2].

However, the known method is characterized by a lack of elasticity of the obtained leather, as well as low values of strength and hygienic properties of the skin.

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

This result is achieved in that in the method of manufacture of the skin, including the neutralization of the semi-finished product, dyeing, filling, greasing and processing of chrome tanning agent, the content produced by acrylamide in the amount of 0.5 to 3.0% by weight of semi-finished product, counting on dry residue, in the presence of potassium persulfate in an amount of 0.1 to 0.5% by weight of semi-finished products and greasing osushestvlya, introduction to the structure of the skin of the acrylamide monomer and subsequent polymerization directly inside and in the interfiber spaces of the dermis and structuring of chrome tanning agent at the declared parameters of the process will almost completely eliminate detached in the finished skin, improve its strength properties, to improve the degree of failover dyes.

The resulting effect is due to the fact that Monomeric acrylamide TU 2433-002-04836741-96, with a minimum size of molecule that easily searches in the space between the papillary and reticular layers of the skin and with the introduction of a system initiator (potassium persulfate) is polymerized, forming as sewn copolymer involving fragments of amino acid residues, and a homopolymer, which is deposited in the spaces between the fibers of the skin, fastening them. A small part of the free acrylamide, unreacted polymerization, interacts with acid and direct dyes, providing them with a solid fixation in the structure of the dermis and superficial layers, thereby increasing the depth of tone painting. Subsequent processing of chrome tanning agent allows you to lock in the structure of the oligomeric and polymeric molecules and the Torah of potassium persulfate less than 0.1%, no effect is achieved due to the fact, under these conditions no polymerization of acrylamide in the structure of the dermis.

With the introduction of acrylamide more than 3% and the initiator potassium persulfate more than 0.5% a significant number of the resulting homopolymer fills the interrelations of structures space of the skin, giving it a "reinstall" that impairs its hygienic properties.

The technology of the method is as follows.

Tanned semi-finished product obtained from the skins of cattle on a standard methodology, after neutralization and dyeing process when J. K. 1.0 to 1.2 and a temperature of 40 - 45oC solution of acrylamide in the amount of 0.5 to 3.0% by weight of semi-finished product, counting on a dry residue. After 30 - 50 min from the beginning of the processing drum impose 0.1 - 0.5% potassium persulfate and processing continue another 1.5 to 2.5 hours Then metered into the drum chrome tanning agent in amounts of 2 to 4% by weight of semi-finished product, counting on a technical product, and processing continues for 45 - 50 minutes, after which the drum fill greasing emulsion and spend greasing skin for 50 - 60 minutes Then the old fluid is drained and spend washing in cold water for 15 - 20 minutes Further processes and operations carried out by standard methods.

Prci process when J. K. 1,0, a temperature of 45oC the dye solution at a rate of 2.5% and after 60 min in the drum enter solution of acrylamide in the amount of 0.5% by weight of semi-finished product, counting on a dry residue. After 45 min in the dryer metered dry 0.1% potassium persulfate. After 2 h after injection of acrylamide in the drum dispense a chrome tanning agent in the amount of 2% by weight of semi-finished product, considering the technical product and the treatment continued for 45 minutes Later in the drum fill greasing emulsion and it is greased skin for 60 minutes and Then the liquid is poured, conduct short 15-minute rinse in cold water. Further processes and operations carried out by standard methods.

Example 2. Tanned semi-finished product from raw materials rawhide average process as in example 1, but the consumption of acrylamide is 1.8% by weight of semi-finished product, counting on dry matter and potassium persulfate and 0.3% by weight of the semifinished product.

Example 3. Tanned semi-finished product from raw materials rawhide easy process as in example 1, but the flow acrylamide is 3.0% by weight of semi-finished product, counting on a solid residue, and the consumption of potassium persulfate 0.5% of the weight of the semifinished product.

Example 4. Tanned semi-finished product from raw materials of the bull is treated as in example 1, but the flow Leah 0,09% by weight of the semifinished product.

Example 5. Tanned semi-finished product from raw materials byczyna heavy process as in example 1, but the consumption of acrylamide is 3.2% by weight of semi-finished product, counting on a solid residue, and the consumption of potassium persulfate and 0.6% by weight of the semifinished product.

Qualitative indicators of finished leather obtained according to examples 1 to 5 and the prototype shown in the table.

The use of the proposed method will allow you to get soft, naturiste, intensely colored skin with high strength properties.

The method of manufacture of the skin, including the neutralization of the semi-finished product, dyeing, filling, greasing and processing of chrome tanning agent, characterized in that the content produced by acrylamide in the amount of 0.5 to 3.0% by weight of semi-finished product, counting on dry residue, in the presence of potassium persulfate in an amount of 0.1 to 0.5% by weight of semi-finished products and greasing is carried out after the processing of chrome tanning agent.

 

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