The way of processing leather

 

(57) Abstract:

The method is designed to generate koi for various purposes. Horses from the skins of cattle after neutralization and washing is subjected to dyeing, greasing, and then carry out the fixation of a complex salt of acetic or formic acid and Diethylenetriamine General formula C4H13N3(RO)nwhere R is CH3N h = 1 - 3. Complex salt take in the amount of 2 to 4% by weight of the skins. After fixing the skin again it is greased oxide ethoxylated octadecylamine. The method allows to improve the quality of the leather. table 2.

The invention relates to the leather industry, in particular for dyeing and greasing processes, and can be used in making leather for various purposes.

A method of processing leather, including dyeing, fatliquoring and napolnennye skin with a solution of a cationic resin (Carbamoyl TSEM or Carbamoyl A) in an amount of 2-5% by weight of shaved leather in the presence of a softener (cationic fat ZNIIK or Stearic-6) in an amount of from 0.3 to 0.7% by weight of shaved leather [1].

The disadvantage of this method is that the use of cationic resin for filling the skin does not allow to obtain elastic the th solution is a way of processing leather from raw pork, including painting, greasing, fixation of formic acid in the amount of 1% by weight of the skins and additional greasing cationic fat Liabilitya SO in the amount of 3% by weight of the skin [2] .

The disadvantage of this method is that the use of formic acid for fixation of dyes and fats leads to a sharp pH of the surface layers of the skin that does not allow them evenly distributed in the thickness of the dermis, and causes a decrease in the quality of the leather from the hides of cattle.

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, including painting, greasing, fixation and additional greasing cationic fat, fixation conduct complex salt of acetic or formic acid and Diethylenetriamine General formula C4H13N3(RCOOH)nwhere R is CH3H, n=1-3 2-4% by weight of leather, and as cationic fat using the oxide ethoxylated octadecylamine (Capri W).

A distinctive feature of the proposed method is that used for the fixation of dyes and fats complex salts of acetic or formic acid and deatsetilirovanie of octadecylamine evenly and deeply penetrate into the thickness of the dermis, improving quality leather.

Complex salts of acetic or formic acid and diethylamine General formula C4H13N3(RCOOH)nwhere R is CH3H, n = 1-3 are crystalline substances in light gray with a basic substance content of 90-95% and a pH value of 10% aqueous solution of 4.5 to 5.5. Complex salt obtained by reaction of interaction of 1-3 mol of acetic or formic acid with 1 mol of Diethylenetriamine at 25-30oC for 2-3 h in the reactor with cooling water under vigorous stirring. The acid fed to the reaction zone in small portions in order to avoid overheating.

Cationic fat Capri W is a light yellow paste well emulgirujushchie in the water. The basic substance content of 80%, a pH of 5% aqueous emulsion of 4.8. Get Capri W oksietilirovannye of octadecylamine at 140-150oC and a pressure of 2.3 ATM with the subsequent processing of the obtained product to a 25% solution of hydrogen peroxide in the presence of formic acid.

Introduction complex salt when you commit less than 2% by weight of leather does not provide strong binding dyes and fat on the fiber of the skin.

With the introduction of complex salts of more than 4% from m the like and a complex salt.

The number of acidic residues n = 1-3 in the molecule of the complex salt is due to the coordination number of nitrogen and other can not be.

The method is as follows.

Leather obtained from the skins of cattle by standard methods, after washing and neutralizing subjected to dyeing with W.to. of 0.7-0.8 and a temperature of 40-45oC for 45-50 minutes Consumption of dyes 2-3% by weight of the skins. Then the water temperature 75-80oC lead well.to. in the drum to 1.0-1.2, pour the fat emulsion in the amount of 8-9% by weight of leather, considering the 100% fat, and processing continues for about 50-60 minutes After fatliquoring in the drum dispense a complex salt of acetic or formic acid and Diethylenetriamine 2-4% by weight of the skins. After 20-40 minutes of entering the cationic emulsion of fat Capri W in the amount of 2.5-3.0% by weight of leather, considering the 100% fat, and processing continues for 20-30 minutes Further processes and operations carried out by standard methods.

Various treatment options skin by example and prototype are given in table. 1.

Quality leather presented in table. 2.

Using the proposed method allows to obtain a uniformly colored skin for the tion, fixation and additional greasing cationic fat, characterized in that the fixation of conduct complex salt of acetic or formic acid and Diethylenetriamine General formula C4H13N3(RCOOH)nwhere R is CH3H, n = 1 to 3, 2 to 4% by weight of leather, and as cationic fat using the oxide ethoxylated octadecylamine.

 

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FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

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