A production process for preparing wet yellow leather based on iron-zirconium-aluminum complex tanning agent

Abstract

The invention relates to the technical field of tanning chemistry and engineering, and provides a production technology for preparing yellow wet leather on the basis of an iron-zirconium-aluminum complex tanning agent. The production technology comprises the following steps: pretreating pickled naked leather at first; and then carrying out chrome-free tanning. Crust leather which is manufactured by the production technology for preparing the yellow wet leather on the basis of the iron-zirconium-aluminum complex tanning agent is compact and delicate in grain side, the color is uniform and full, a leather body is plump, soft and elastic, the shrinkage temperature of the crust leather exceeds 90 DEG C, washing resistance is excellent, subsequent processing performance is good, in a process of the production technology for preparing the yellow wet leather on basis of the iron-zirconium-aluminum complex tanning agent, a chrome tanning agent is not used or does not exist, environmental pollution is reduced, and harm of hexavalent chrome to human bodies is eliminated. In addition, the production technology is simple and convenient, easy to realize and relatively low in production cost, and is a clean production technology suitable for being used in large-scale production.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to a production process for preparing wet yellow leather based on an iron-zirconium-aluminum complex tanning agent. Background technique [0002] With the increasingly severe environmental protection requirements at home and abroad, the pollution problem of tanning industry, especially the problem of chromium pollution, makes the sustainable development of tanning industry face severe challenges. As early as 2008, my country has listed chrome-containing waste from tannery on the list of hazardous solid waste, and formulated it in the latest "Discharge Standard of Water Pollutants for Tannery and Fur Processing Industry" (GB30486-2013). Strict regulations are made for the comprehensive wastewater of leather workshops: the total chromium content shall not exceed 1.5mg / l, and the hexavalent chromium content shall be less than 0.2mg / L; at the same time, the Euro...

AI Technical Summary

Problems solved by technology

This tanning agent has a good application prospect, but there are still shortcomings such as insufficient fullness, low shrinkage temperature, and poor washing resistance.