Waterproof chrome-free tanning leather manufacturing process

Abstract

The invention relates to the technical field of leather manufacturing process, and provides a waterproof chrome-free tanning leather manufacturing process. The manufacturing process comprises the steps that firstly, organic silicone modified polyurethane resin, an organic synthetic tanning agent and a polymetallic complex tanning agent are used for pickling-free and chrome-free combined tanning; then chrome-free retanning and chrome-free fixing are carried out by using the polymetallic complex tanning agent, and a waterproof polymer and a waterproof fatliquoring agent are used for filling andfatliquoring; the obtained chrome-free tanning leather has excellent waterproofing performance, and has both good physical and chemical properties and subsequent processing performance. During the process of implementation of the waterproof chrome-free tanning leather manufacturing process, by using cleaner production technologies such as ammonia-free deliming and softening co-bath, pickling-freeand chrome-free combined tanning and chrome-free retanning and chrome-free fixing, the prepared waterproof chrome-free leather is ecological and environmentally-friendly and excellent in waterproofingperformance, and pollution of heavy metal chromium is eliminated from a source; and the technical process is simple, the practicability is high, and the waterproof chrome-free tanning leather manufacturing process 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