Composition for tanning leather and fur

C14C3/18 - using polycondensation products or precursors thereof

 

(57) Abstract:

The composition relates to the tanning of leather and fur semi-finished product. The composition contains the product of the interaction of guanidine with formaldehyde - methylol derivatives of guanidine with a content of from 25 to 48% of the active active substance. The use of this composition allows to expand the range of tannins and improve the environmental friendliness of production.

The invention relates to light industry, namely, leather and fur production, and can be used for tanning leather and fur semi-finished product.

Known methods tanned without using chromium compounds (Ed. mon. 1792430, CL 14 With 3/08, 3/18, published 30.01.1993), when to raise the temperature of the welding derma apply metaloprokatniy amides of dicarboxylic acids.

The closest in technical essence of the present invention is tanned sheepskin dicyandiamide resins (see Belyakova Century. And. and others. Technology furs and fur sheepskin, Moscow: Light and food industry, 1984, S. 127-128) prototype, where due to the use of the polymer product is achieved not only the effect of tanning is as tanning agents, improving the sustainability of production.

This goal is achieved by the fact that as a tanning material are the products of interaction of guanidine with formaldehyde. Used when modifying polyhexamethylene guanidine (metacid) with a molecular weight of 8-10 thousand.E. m. is biocidal agent with antiseptic, fungicidal and other kinds of biological activity that has a positive effect on the wastewater composition leather and fur ventures and properties of semi-finished and finished products.

The proposed composition for tanning is obtained as follows.

Polyhexamethylene guanidine (phmg) is treated with a solution of formaldehyde (molar ratio of 1:3-4) 0.01 N. the solution of borax or in the presence of glacial acetic acid at a temperature of 45-100oC for 2-8 hours Generated metaloprokatniy pgmg in the form of a resinous product can be used for tanning leather and fur semi-finished product.

Example 1.

In the reaction flask make 70,5 m H. pgmg, 146 ml of 38% formalin solution and 125 ml of 0.01 n solution of borax. Synthesis of lead in a boiling water bath with constant stirring for pgmg, 110 ml of formalin solution and 13 ml of glacial acetic acid. The synthesis is carried out at a temperature of 45-60oWith constant stirring for 2-4 hours

The resulting methylol derivatives of guanidine contain from 25 to 48% of active substance.

By reducing processing time, the number of methylol groups pgmg involved in the interaction with collagen decreases, the temperature change is affected in the same way.

Leather or fur prefabricated, processed the proposed composition for 4-6 hours at a temperature of 20-35oAnd the concentration of the tanning agent 5-20 g/l, has a temperature welding collagen 85oWith that in the subsequent aging additionally increased by 6-10oC. Effect of tanning irreversible, the thickness of the semi-finished product is increased to 20% due to the filling action of the resin.

Installed fungicidal activity of methylol derivatives pgmg, tanned semi-finished product has planetology for a long time without additional processing. In wastewater enterprises are not connected chromium, characterized by toxicity, which increases the ecological safety of production. the eat, as a tanning material used, the product of the interaction of guanidine with formaldehyde - methylol derivatives of guanidine with a content of from 25 to 48% of active substance.

 

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