The way we produce leather

 

(57) Abstract:

The method relates to the production of leather for the uppers from the skins of cattle. Prefabricated pre doublenaut chrome tanning agent. Treated with chitosan in the amount of 2-5% by weight of the semifinished product. Neutralize that color, it is greased. Then perform the final retanning chitosan in the amount of 2-5% by weight of semi-finished and chrome tanning agent. Last injected through 25-45 min after injection of chitosan. The method can improve the quality of the skin by increasing its softness, elasticity obtaining deep rich coloring of the front surface of the skin. table 1.

The invention relates to the leather industry, in particular, for dyeing and greasing processes, and can be used in making leather for Shoe uppers from raw cattle.

There is a method of generation of leather, including neutralization, retanning synthetic tanning agent in combination with plant extracts, washing and processing of aluminium tanning agent. Then spend the dyeing and greasing with the addition of a cationic dye and processing sequentially polymer tanning agent, formic acid, aluminum is I low adhesion coating film and uneven coloring due to the formation of aluminum Soaps on the surface of the semifinished product.

The closest analogue of the proposed technical solution is the way to making skins, including retanning semi-finished chrome tanning agent, processing chromiferous protein hydrolysate in an amount of 3.5 to 4.5% by weight of semi-finished product at a temperature of 40-45oC for 50-60 min, neutralization, dyeing, greasing and retanning organic tanning agent in the presence of chrome tanning agent at a ratio(1,0- 1,5) : 1. /2/.

The disadvantage of this method is the increased stiffness of the skin associated with the use of chrome-containing protein hydrolysate, penetrating deeply into the structure of the dermis and forms a durable frame with loss of elasticity, and low komleksoobrazuyuschee activity of hydrolysate and organic tannins, resulting in elevated levels of unbound chromium in the solution and deposition of it in the surface layers of the skin that does not allow you to get rich colouring of the front surface.

The technical result of the invention is to improve the quality of the skin by increasing their softness, elasticity and receive a deep rich colouring of the front surface.

This result is achieved by the fact that in paganisim connection neutralization, dyeing, greasing and final retanning organic compound and chrome tanning agent, as the organic compounds used chitosan in the amount of 2-5% by weight of cement, and in the final doublepane chrome tanning agent is injected through 25-45 min after injection of chitosan.

A distinctive feature of the proposed method is that use as organic compounds of high molecular weight complexing compounds chitosan promotes complete setting of chromium compounds from solution and solid fixation in the structure of the dermis. The use of chitosan after fatliquoring leather will be fixed in the structure of the molecule of dye and fatty substances, and the subsequent processing of chrome tanning agent leads to fixation in the material chitosan-chromium complexes.

The effect due to the chemical structure of chitosan, which represents a high-molecular compound of organic origin with a molecular weight of 80-200, polymer chain which consists of 1-4 linked glucosamine residues and small amounts of N-acetylglucosamine links. THE-9289-046-046-89-375-96.

Experimental elimination of chromium compounds, fats and dyes.

With the introduction of chitosan in the amount of more than 5% by weight of semi-finished product because of its high acidity may razumevanje chrome-plated semi-finished product and the decrease of the strength properties of the skin associated with the deposition of fat and chrome tanning agent in the surface layers of the skin.

Reducing the duration of treatment with chitosan before the introduction of chrome tanning agent less than 25 min, does not allow for full absorption and even distribution of the chitosan in the structure of the dermis and may cause the deposition of large particles chrome-chitosan complex solution. Increasing the duration of treatment khitozanom over 45 min impractical, as it lengthens the processing time without obtaining any significant effect.

The method is as follows:

The semi-finished product obtained from the skins of cattle by standard methods after preliminary retanning chrome tanning agent is treated with chitosan in the amount of 2-5% by weight of semi-finished when J. K. 0.8-1.2 and a temperature of 35-40oC for 50-60 minutes followed by neutralization with sodium bicarbonate and washing at 55-60oC, After that make dying in J. K. 0,8-1,2 within 30-45 is Sanam in the amount of 2-5% by weight of cement, and through 25-45 min in the processing solution is injected chrome tanning agent in the amount of 1.5 to 2.5% by weight of semi-finished product, counting on a technical product, and the treatment continued for 30-45 minutes Further processes and operations are performed according to standard methods.

Example 1. Polylogarithm obtained by standard methods from the skins of cattle, after retanning chrome tanning agent is treated with chitosan in the amount of 2% by weight of semi-finished when J. K. 0.8 and the temperature of the 35oC for 60 minutes followed by neutralization with the consumption of sodium bicarbonate 2% by weight of semi-finished and rinse with 55-60oC. the Dyeing of the semi-finished product is carried out at J. K. 0,8 for 35 min, greasing is carried out at the expense of fat 8% for 50 minutes Then prefabricated doublenaut chitosan in 2% by weight of the semifinished product. After 25 min in the processing solution is injected chrome tanning agent in the amount of 1.5% by weight of the semifinished product, counting for the technical product. Further processes and operations 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 the consumption of chitosan after retanning chrome tanning agent and post 35 min after injection of chitosan.

Example 3. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but the consumption of chitosan after retanning chrome tanning agent and after fatliquoring is 5% by weight of semi-finished and chrome tanning agent is administered 45 min after injection of chitosan.

Example 4. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but the consumption of chitosan on the first and second stages of processing 1.5% by weight of semi-finished and chrome tanning agent lead through 20 minutes after administration of chitosan.

Example 5. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but the consumption of chitosan on the first and second stages of processing amounts to 6% by weight of semi-finished and chrome tanning agent is injected through 50 min after injection of chitosan.

Qualitative indicators skins, obtained by the proposed method and the prototype presented in the table.

Using the proposed method allows to obtain a soft, supple leather with a uniform coating on the square and deep color of the front surface.

The method of manufacture to which the group neutralization, dyeing, greasing and final retanning organic compound and chrome tanning agent, wherein as the organic compounds using chitosan in the amount of 2 to 5% by weight of cement, and in the final doublepane chrome tanning agent is injected through a 25 - 45 min after injection of chitosan.

 

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