SU693706A1 - Method of leather tanning - Google Patents

Description

(54) METHOD FOR BORING OF THE SKIN

I

Imaging refers to the leather industry and can be used in making leather.

A known method for tanning leather, which, after softening and washing, is treated with emulsions of organic substances (for example, kerosene) I.

This method does not ensure a uniform distribution of the tanning agent over the thickness of the dermis and leads to the tightening of the facial layer, resulting in harsh and flat skins.

The closest to the proposed method is the bespikelny tanning of leather with mineral salts, which means that the tanning process is carried out in the presence of mineral oil, synthetic or natural fat 2.

However, when tanning, a face layer sticking and fixing of mines formed on the hem for various reasons occur with this person.

The purpose of the invention is to improve the quality of leather and intensify the tanning process in leather production.

This is achieved by using a saltless method of tanning-free tanning, which consists in processing the emulsion of emulsions of organic substances and of oak and mineral salts, sequential treatment of the emulsion of organic matter and chromium salts at 38-45 ° C.

A mixture of stabilized chlorinated hydrocarbons with a chlorine content of 13--47% and a non-ionic surfactant (for example, precella) is used as an emulsion of organic substances. The consumption of stabilized chlorinated hydrocarbons depends on the type of raw material and the purpose of the leather and is 1-4 / o by weight mole; consumption of non-inogenic surfactant 5-10% by weight of chlorinated hydrocarbons.

The ability of stabilized chlorinated hydrocarbons with a chlorine content of 13-470 / 0 to chemically interact yQ with the structural elements of the dermis ensures uniform distribution of chromium salts throughout the thickness of the dermis. The latter is achieved by using an emulsion of stabilized chlorinated hydrocarbons and

nonionic surfactants in the specified amounts. The implementation of the proposed method in the specified temperature mode eliminates the temperature drop during the transition from the pre-blasting processes directly to tanning, contributes to obtaining a high-quality face layer, and also accelerates the tanning process by 2-3 times in comparison with the known method. The processing time is 2-4 hours.

The method is carried out as follows.

Example 1. Raw materials - all kinds of hides. All preparatory processes for pickle vanes are carried out in the usual manner. Instead of pickling, the hide is treated at a temperature of 38–40 ° C, LC 1 with a 25% emulsion consisting of a mixture of stabilized chlorinated hydrocarbons (in this case with a chlorine content of 13%) and a non-inogenic surfactant. Consumption of stabilized chlorinated hydrocarbons 2% by weight of the mole; consumption of nonionic surfactants by weight of stabilized chlorinated hydrocarbons.

The order of preparation of the emulsion is as follows: to the calculated amount stabilize Offer 2 45 3 2.4 110 2 38-4О 3 3.5 115

On organoleptic assessment of the skin, developed by the proposed method, softer, full, with a clean face.

The use of the selling method of tanning leather reduces the duration of the tanning process by 2-3 times, increases the equipment's carrying capacity, improves the quality of the finished leather.

Claims (3)

The claims of the invention of comic substances and chromium salts, distinguish the method for tanning leathers by following the leathers and intensifying the process of duplicating Body treatment with an organ emulsion; As an emulsion of organic believed chlorinated hydrocarbons and a surfactant brought to a molten state, with continuous displacement, water heated to 70-75 ° C is gradually added. Tanning is carried out on a new bath at LCD 1 and a temperature of 38-40 ° C. The consumption of oak, salt, chromium with a basicity of 35% is 29%. The duration of tanning is 1-3 hours. The end of the process is controlled by the breakdown on the “instrumentation. Subsequent processes are carried out according to the standard procedure, and the elongation of the semi-finished product by the tanning salts of chromium is excluded. Example 2. Raw materials - all kinds of hides. All processing parameters are similar to Example 1, but the temperature of sequential treatment of an emulsion of organic substances and chromium salts is maximum allowable - 45 ° C. Example 3. Raw materials - all kinds of hides. All processing parameters are similar to the example, but the composition of emulsions of organic substances includes stabilized chlorinated hydrocarbons with a chlorine content of 47% at a flow rate of 3% by weight a mole. The comparative characteristics of the various ways of tanning leather are given in the table. This is due to the fact that, in order to increase the quality6, 1 8.0 214 2.8 30.0 5.1 10, O 215 2.43 DA, O 5 6937066 substances use a mixture of stabilized sources of information, chlorinated hydrocarbons containing 13-47% of the amount taken into account during the examination of chlorine ( - from the mass of the mole and non-inogenic over-1. USSR author's certificate active substance in the amount of jvjb 312872, cl. From 14 to 1/00, 1969. 5-UUo from the mass of chlorinated carbohydrate-s genera, and the treatment of the mole emulsion orga-2. USSR author's certificate nical substances and salts of chromium are No. 121525, cl. C 14 C 3/06, 1959 (proto-temperature 38-45 ° C for 2-4 hours. Type).