SU1089129A1 - Method for skin dressing - Google Patents

Abstract

1. METHOD OF DEVELOPING CATS by pickelling with sulfuric acid and boiling and subsequent tanning with chromium compounds in the presence of a complexing agent, characterized in that, in order to improve skin quality and decrease the amount of chromium compounds in wastewater, 1 , 3,5-three - ((-hydroxyztil)) hexahydro-5-triazine. 2. Method pop.1, otlichak u and with the fact that 1,3,5-three - (/ 3-hydroxyethyl) -hexahydro-5-triazine O S is used in an amount of 0.3-1% from 1a mass of mole in the calculation of the active substance.

Description

The invention relates to the leather industry and can be used in making leathers of chrome oak for various purposes from various raw materials. The production technology for leather for shoes and other leather goods is tanned with chromium, preceded by pickling a cannon. The consumption of chromium salts is 2.0-2.5% by weight of the mole, and the conditions of preparation for tanning and tanning are such that 20-25Z chromium compounds do not bind with the main protein of the skin - collagen, but remain in solution , they are irretrievably lost, and the toxicity of the sewage of leather factories increases, which has a negative impact on the environment. Improving the use of chromium tanning compounds and creating preconditions for low-waste tanning technology is possible by regenerating them from spent solutions, which requires capital expenditures on the construction of special structures, and by creating conditions for treating mole, at which activation of tanning and chromium compound collagen would contribute to improving the quality of the skin. There are known methods for activating tanning with chromium compounds by using various compounds (addends) with high coordination activity with respect to this trivalent chromium in the complex compound. In order to more fully bind chromium compounds with collagen, it is envisaged to use mono and dicarboxylic acids and their salts in pickling and tanning, forming complexes with chromium compounds. A known collection of chromic tanning using adipic acid in combination with aluminosilicate zeolites lj. However, a large amount of dicarboxylic acid introduced into the tanning bath is not only economically unattractive for the activation of chrome tanning, but also leads to an increase in the concentration of dicarboxylic acid in the used bath and contamination of wastewater. In addition, zeolites are deficient compounds. There is a method of treating the skin, including the pickling of the mole in at. in the presence of a complexing agent: phthalic or formic acid at a flow rate of 0.5–1% by weight of a mole, tanning at a flow rate of chromic tanning agent with a basicity of 38–42%, equal to 1, .82, 4% chromium oxide with the introduction of magnesium compounds into the tanning bath: as magnesium compounds, magnesia is used in the amount of 0.4-0.8% by weight of mole per millimeter of oxide r2j. However, up to 18% of chromium salts remain in the spent solution, while the activation of chrome tanning is carried out through the use of two complexing agents phthalic or formic acid in pickling and magnesia in tanning, which complicates the practice of preparing tanning and tanning. In addition, the consumption of phthalic acid is such that, due to the low solubility {orthophthalic acid solubility is 0.57 g in 100 ml of water, its calculated concentration in pical liquid is 0.62-1.25% according to the parameters of the process. a part of it remains in an undissolved state in the working solutions during pickling and tanning. Performing pickling and tanning operations results in the loss of this reagent. Magnesium is a scarce and relatively expensive reagent that is inaccessible to the leather industry, therefore difficulties arise in the practical implementation of the method. The purpose of the invention is to improve the quality of the skin and reduce the amount of chromium compounds in wastewater. The goal is achieved by the fact that according to the method of making the skin by pickling with a solution of sulfuric acid and salt and subsequent tanning in the presence of a complexing agent, t, 3,5-three - (3-hydroxyethyl) -hexahydro-e - is used as a complexing agent triazine. Moreover, 1,3,5-tri - (- hydroxyethyl) -hexahydro-5-triazine is used in an amount of 0.3-1% by weight mole per active substance. After pickling with GF 0.4-0.7 and IB-ZO C using sodium chloride (4-7%) or ammonium sulphate (6-7%) and sulfuric acid (0.4-1.2%) in that In the same bath or in a new bath, tanning with chromium compounds occurs at a consumption rate of 1.41, 8% of the mass of a mole per chromium oxide. After the semi-finished product has reached full penetration with chromium salts, 0.3-1% 1,3,5-tri- (5-hydroxy hydroxyethyl) -hexahydry-5-triazine is added to the bath per 100% product. . The preparation is dispersed with water at a temperature of 20 ° C in a ratio of 1: 3; 20-25% of the preparation can be introduced into the waste pickell liquid, the rest - after the preparation of the solution with chromium salts. The tanning is completed when the skin is resistant to the instrumentation sample. The tanning capacity is 4–8 hours. The use of the indicated preparation according to the proposed method favors a more complete binding of the tanning compounds with the derma chromatic collagen, which makes it possible to save the chrome tanning agent. The amount of chromium salts in the spent bath is significantly reduced and is 4-7%, which significantly reduces the pollution of the waste water with chromium salts. The semi-finished product after tanning is characterized by a smooth surface without a lip, which will facilitate the production of facial soft, elastic elastic skin. 1., 3,5-tri- (| 5 -hydroxyethyl) - sagidro-5-tri-in hex is used as an inhibitor of the microbiological damage of lubricants. Table 1 gives specific examples of the method implementation (raw materials: braces of an average weight of 20 kg). Further processing is carried out according to the current procedure. The characteristics of the spent tanning solution and the developed leather are given in Table 2. Indicators of the remaining properties of the leathers treated in examples 1-3, meet the requirements of GOST 17, 258-80 The application of the proposed method, ensuring the quality of the skin, improves the use of chromium salts, saves chrome tanning, simplifies the technology that , three shsh greater number of components-activators of chromium blend, and only one proposed 1,3,5-tri- (α-hydroxyethyl) -hexahydro-S-triazine, which has a combined effect on the system: collagen of the derma — solution of chromium -. It intensifies the tanning of the michrome compound by adjusting the pH of the semi-finished solution system and coordinating its interaction with complex No. 4 and chromium compounds. At the same time, 1,3,5-tri- (| 3-hydroxyethyl) -hexahydro-5-triazine is fixed by collagen, providing an additional formative, shielding and wedging effect on the skin structure, helping to obtain a soft, full, non-polished and non-duagast skin with smooth , smooth, without tanning front face. The proposed method makes it possible to eliminate the use of the deficient formic I.T1I of another organic acid during pickling, to reduce the consumption of fatty substances in skin dosing. Table 1

Pickling:

LCD

Sodium Chloride Sulfuric Acid

ъ

Duration

0.6

0.6 5.0 7.0 1.2 1.2 3.0-3.5

3.0-3.5

1,3,5-three - (/ -hydroxyethyl) - exahydro-b-triazine

Duration, h Tanning:

lcd

Temperature, ° G

1- portion of chrome tanning with a basicity of 30-33% based on chromium oxide

Duration, h

2- portions of chrome tanning with 40% basicity, calculated on chromium oxide

Duration, h

1,3,5-tri- (J-hydroxyethyl) -hexahydro-5-triazine

Duration, h

Continuation tabl

0.2

Pickle liquid drain 1.0

0.7

0.6 25 20-22

0,8 0,6 3,0 3,0 prokrasa salt of chromium chromium

0.5-0.8 0.3-0.65 3-4 3-4

positive sample on Kip Concentration of chromium oxide in the used bath, g / l 0.7 The content of chromium compounds in the skin per 4.41 for chromium oxide,% The number of developed facial skins with improved quality 52.0% 2.0% Grade of finished leather % 1.31, 2 4,924,684, 34 45,050,035,021,0 90,590,886,485.3

Claims (2)

1. METHOD FOR PRODUCING SKIN by pickling with a solution of sulfuric acid and sodium chloride and subsequent tanning with chromium compounds in the presence of a complexing agent, characterized in that, in order to improve the quality of the skin and reduce the amount of chromium compounds in wastewater, 1 is used as a complexing agent , 3,5-tri - ((-E-hydroxyethyl) -hexahydro-5-triaein. 2. The method according to π. % of the mass of the gole calculated on the active substance.