What are the chemical materials used in leather processing?
Release time:
2023-04-19
synthetic tanning agent
Early synthetic tanning agents were limited to those synthetic products whose tanning properties were similar to those of natural vegetable tanning agents. They were used to replace (or partially replace) natural vegetable tanning agents, mainly synthetic products with aromatic compounds as raw materials. At present, synthetic tanning agent generally refers to some organic products as raw materials, through chemical reaction synthesis, with tanning effect of complex organic mixture.
surface active agent
Surfactant is an important product of fine chemical industry, and its application in leather industry has penetrated into the processes of soaking, liming, softening, tanning, dyeing, fattening, finishing and filling. Surfactants are amphiphilic molecules with hydrophilic groups and lipophilic groups, and the hydrophilic-lipophilic balance value is generally used to represent the hydrophilicity of surfactants, referred to as HLB value.
Leather fatliquor
In the process of leather production, it can play a good lubrication effect on the tanned leather fiber, significantly improve the physical properties of leather, and the material with fatliquoring effect on leather is collectively referred to as fatliquoring material or fatliquoring agent. Leather by adding fat can make it have suitable soft, plump, tough, waterproof, anti-folding, anti-wear and other characteristics, improve the physical and mechanical properties of leather.
Composition of leather fatliquors
The fatliquoring of the light leather production process adopts emulsion fatliquoring, so the fatliquoring agent used in the light leather production process has two main components: oil component and emulsifying component. In addition, there are a small amount of other ingredients, such as fungicides. The oil composition plays an important role in the fatliquoring of the fatliquoring agent, and has an impact on the physical properties and appearance quality of the leather; the emulsifying composition makes the insoluble oil composition better dispersed in the water, forming a relatively stable emulsion, which promotes the uniform penetration and distribution of the oil composition in the leather fiber.
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