A non-pickling and chrome-free tanning process based on multi-metal complex tanning agents

Abstract

The invention relates to the technical field of tanning chemistry and engineering, and provides a no-pickling chrome-free tanning process based on a multi-metal cooperation tanning agent. Softened naked leather is pretreated, then, no-pickling chrome-free tanning is carried out, wet white leather manufactured through the no-pickling chrome-free tanning process based on the multi-metal cooperation tanning agent is fine and compact in grain side, uniform and full in color and flexible, rich and elastic in leather body, the shrinkage temperature exceeds 90 DEG C, and in the implementing process of the no-pickling chrome-free tanning process based on the multi-metal cooperation tanning agent, a chrome-contained material is not adopted, pickling operation is not carried out, the content of chloride ions in tanning waste liquid is reduced to below 300mg / L, the pollution and the danger of heavy metal chromium to the environment are reduced, in addition, the production process flow is simplified, the production period is shortened, production cost is reduced, and the process is the clean production process with the good industrialized prospect.

Description

Technical field [0001] The invention relates to the field of tanning chemistry and engineering technology, in particular to a non-soaking and non-chromium tanning process based on a multi-metal tanning agent. Background technique [0002] As the country’s economic level and people’s living standards are getting higher and higher, people are paying more and more attention to the living environment, and the country and governments at all levels have become more and more perfect in environmental protection legislation. The pollution problem in the tanning industry has become an entire industry. The huge challenge of sustainable development. The tanning industry is a major water user. According to statistics, the amount of wastewater generated in the tanning industry in 2014 was approximately 142 million m 3 , Its composition is complex, containing chromium, sulfur, chlorine, ammonia nitrogen, organics and other pollutants, it is difficult and costly to treat, so how to reduce or eli...

AI Technical Summary

Problems solved by technology

In view of this technical problem, the Chinese patent application number 201210269479.X discloses a method for tanning leather with less chrome based on zirconium-aluminum-titanium complex tanning agent, through which the purpose of no pickling and less chrome tanning can be achieved. However, the final leather still has quality problems such as color deepening, and the discharged wastewater still contains chromium, which cannot effectively realize clean production

[0006] In order to solve the problems caused by pickling in the traditional tanning industry, tanning chemists have proposed methods of salt-free pickling and non-pickling tanning. Although good research results have been achieved, it is still difficult to apply in actual production

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