Abstract
In this article, tannins are substances that change the physicochemical and mechanical properties of the skin when exposed to it and turn the skin into leather. Vegetable tannins are commonly referred to as tannins. Both abroad and in our country, plant extracts are mainly used to soothe thick leather on the soles of shoes, technical leather, leather of belts and seams, leather of high boots and leather.
Highlights
Tanned are formed as a result of plant life
A huge number of plants on the globe contain tanned in varying amounts
In the molecules of all vegetable tannins there are several benzene nuclei, which necessarily contain a number of hydroxyl groups as substituents
Summary
Tanned are formed as a result of plant life. A huge number of plants on the globe contain tanned in varying amounts. Chemical composition, tanned, vegetable raw material bark, footwear, technical leather, belt, leather, ethics, leather The extraction of tannins from tanning materials is carried out with hot water or aqueous solutions of some chemical reagents (for example, sulfurous acid salts).
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