CS269591B1 - Tannery auxiliary preparation - Google Patents

Abstract

The problem of the advantageous composition of a tanning auxiliary preparation for the purpose of increasing the thermostability of leather is solved. The essence lies in the fact that the preparation contains 100 parts by weight of chemically unmodified or chemically modified by chlorination triglycerides of fatty acids with the number of carbon atoms C12 and C24, and with a degree of chlorination of 5 to 20%, 5 to 30 parts by weight of alkali silicate and 10 to 70 parts by weight of water.

Description

Invent yourself. refers to a tannery auxiliary preparation, based on vegetable oil or animal fat, an inorganic additive and water, to increase the thermostability of leather.

In the current tanning industry, a wide range of tanning auxiliary preparations is known. The composition and subsequent applications of these preparations are determined by specific requirements. To increase thermostability, a preparation based on triphenyl phosphate or trichloroethyl phosphate or a preparation based on flouroelastomers is known, which is applied from a solution of butyl ethyl ketone. A preparation whose main component is silicones and is applied from a solution of perchloroethylene is also known. Other known preparations contain vinylidene polymers in combination with mimosa extract. Another known preparation is made up of alkaline soaps of aliphatic fatty acids with a number of carbon atoms of 8 to 21 and insoluble chromium complexes prepared from them. Increasing thermostability and reducing leather shrinkage is also achieved by using synthetic lubricants. The disadvantage of known preparations is their one-sided effect and it is necessary to combine them with other preparations, for example, agents. Another disadvantage of these preparations is their application from solutions of organic solvents, which reduces the protection of the living and working environment and reduces safety at work.

The above disadvantages are substantially eliminated by a tanning auxiliary preparation, the essence of which lies in the fact that the preparation contains 100 parts by weight of chemically unmodified or chemically modified by chlorination fatty acid triglycerides with a number of carbon atoms C^ ₂ θ24' ^{80 st} Pň°m chlorination of 5 to 20%, 5 to 30 parts by weight of alkali silicate and 10 to 70 parts by weight of water.

The technical effect of the tanning auxiliary preparation lies in the increased thermostabilizing properties of leather. The combined neutralizing, lubricating and filling effect of the preparation at the same time is also advantageous. The preparation is applied without the presence of an organic solvent, which increases the protection of the living and working environment as well as the protection of safety in the process. The tanning auxiliary preparation is produced from commonly available raw materials. Leather treated with this preparation acquires increased surface and internal resistance to increased temperature due to the effect of insoluble silicate formed during the drying process, deposited in the interfiber spaces and on the surface of the leather. The leather has reduced surface flammability and is resistant to short-term high-temperature exposure. As a result of the insoluble silicate filling the interfiber spaces, the preparation acts as a leather filler. The alkaline pH level of the preparation allows it to have a neutralizing effect on the leather after chrome tanning.

The leather auxiliary preparation according to the invention is illustrated in more detail by the following examples, where the amounts of the components are given in parts by weight.

Example 1 ’

The tanning auxiliary preparation for increasing the thermostability of leather contained 100 wt. d. of beef fat, 25 wt. d. of sodium-potassium silicate with the composition Ha ₂ 0, K ₂ 0 : Si0 ₉ 1 : 4 and 25 wt. d. of water. The chromium-plated cattle splits treated with this preparation met the conditions for evaluating thermostability at 300 C for 10 s.

Example 2

The leather auxiliary preparation, for increasing the thermostability of leather, contained 100 wt. d. of sunflower oil, 10 wt. d. of sodium aluminosilicate with the composition Na ₂ 0 : AlgO^: Si0 _o 5.5 : 1.5 : 3 and 55 wt. d. of water. The brown-tanned splits treated with this preparation met the conditions for evaluating thermostability at 300 0 for 13 S.

Example 3

Tannery auxiliary preparation, for increasing the thermostability of leather, contained 100 wt. d. chlorinated beef fat with a chlorination content of 10%, 12 wt. d. metasilicate

CS 269 591 Bl sodium at the composition Na ₂ O : SiO ₂ 1 : 1 and 50 wt. d. water. ^{The 1} chromium-plated splits of beef treated with this preparation met the conditions for evaluating thermostability at 300 °C for 12 s.

Claims (1)

SUBJECT OF THE INVENTION Tanning auxiliary preparation based on vegetable oil or animal fat, inorganic additives and water, for increasing the thermostability of leather, characterized in that it contains 100 parts by weight of chemically unmodified or chemically modified by chlorination triglycerides of fatty acids and the number of carbon atoms C^ ₂ ní θ24* ^{80 3tu} P“ ní chlorination 5 to 20%, 5 to 30 parts by weight of alkali silicate and 10 to 70 parts by weight of water.