A kind of manufacturing process of waterproof chrome-free tanned leather

Abstract

The invention relates to the technical field of leather production technology, and provides a production process of waterproof chrome-free tanned leather, which first uses organic silicon modified polyurethane resin, organic synthetic tanning agent and multi-metal complex tanning agent to carry out combined tanning without pickling and chrome-free , and then use multi-metal tanning agents for chrome-free retanning and fixing, and use waterproof polymers and waterproof fatliquor for filling and fatliquoring. The resulting chrome-free tanned leather has excellent water resistance, and at the same time has good physical and chemical properties and subsequent Processing performance: In the implementation process of this process, clean production technologies such as ammonia-free deliming and softening in the same bath, non-pickling and chrome-free combined tanning, chrome-free retanning and chrome-free fixing are adopted. The prepared waterproof chrome-free leather is green and ecological , excellent waterproof performance, and eliminate the pollution of heavy metal chromium from the source, the process is simple, the practicability is strong, and it is suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to a production process of waterproof chrome-free tanned leather. Background technique [0002] For a long time, chrome tanning has been mainly used in leather manufacturing at home and abroad. The resulting chromium pollution, such as chromium-containing waste water, chromium-containing solid waste, and chromium-containing waste leather products, has brought serious pollution to the environment. This problem has become a problem that restricts leather The technical bottleneck of sustainable industrial development. Therefore, many developed countries in the world regard the development of chrome-free ecological leather manufacturing technology as the most important development direction of the leather industry, and my country also lists chrome-free leather manufacturing technology as the key technology of "Made in China 2025". After many years of continuou...

AI Technical Summary

Problems solved by technology

At present, there have been many researches on waterproof leather, but they are basically based on chrome tanned wet blue leather. In the subsequent wet dyeing and finishing, water resistance is given to it, and it is fixed with chrome tanning agent or chromium-containing materials. Addition has brought negative effects on the physical, mechanical and sensory properties of leather, and this problem has not been well resolved