Manufacturing method of chromium-removed environment-friendly leather

Abstract

The invention discloses a manufacturing method of chromium-removed environment-friendly leather. The manufacturing method comprises the following steps: S1, rinsing; s2, chromium stripping: the liquid ratio is 100-110%, the temperature is 32-37 DEG C, 2-4 WT% of salt and 2-4 WT% of oxalic acid are added, rotation is performed for 88-92 minutes, then 4-6 WT% of a chromium stripping agent is added, rotation is performed for 110-130 minutes, normal-temperature water is added after drainage, and washing is performed once at the liquid ratio of 180-220%; s3, re-chrome retanning and neutralizing: adding 2-4WT% of an environment-friendly chrome-free tanning agent and rotating for 55-65 minutes at the liquor ratio of 110-130% and the temperature of 28-32 DEG C, then adding 1-3WT% of a substitutive retanning agent and rotating for 55-65 minutes, adding 0.4-0.6 WT% of sodium formate and 0.7-0.9 WT% of an alkali extracting agent and rotating for 35-45 minutes, draining water, then adding 1-2WT% of neutralizing tannin and 0.8-1.2 WT% of the alkali extracting agent under the conditions of the liquor ratio of 13-17% and the temperature of 34-36 DEG C, continuously stirring for 30-60 minutes, then adding 2-4WT% of the environment-friendly chrome-free tanning agent and rotating for 55-65 minutes at the temperature of 28- 0.3-0.6 WT% of synthetic grease is rotated for 55-65 minutes, and then the drum is stopped overnight; s4, filling and dyeing; s5, fat liquoring; s6, color fixation; and S7, finishing and drying. Compared with the prior art, oxalic acid and the freckle removing agent are combined for use, the chromium removing effect is achieved, it is guaranteed that collagenous fibers are not excessively damaged, meanwhile, two or more chrome-free tanning agents are selected for tanning, the advantages of the tanning agents are complementary, and the shrinkage temperature of the tanning agents is greatly increased.

Description

technical field [0001] The invention relates to a method for manufacturing leather, in particular to a method for manufacturing chrome-removed environmental protection leather. Background technique [0002] For a long time, the chrome tanning method is mainly used in leather manufacturing at home and abroad. The resulting chrome pollution, such as chrome-containing wastewater, chrome-containing solid waste, and chrome-containing waste leather products, has brought serious pollution to the environment. This problem has become a constraint on leather. The technical bottleneck of the sustainable development of the industry. 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 a key technology. After years of continuous exploration by the vast number of tanners...

AI Technical Summary

Problems solved by technology

After many years of continuous exploration by the majority of tanning workers, a variety of chrome-free tanning technologies such as organic tanning, vegetable tanning, and non-chrome metal tanning have been developed. However, the leather obtained by each tanning method has shortcomings, such as organic tanning. Leather is not heat-resistant, not washable, vegetable tanned leather and zirconium tanned leather are hard or soft, etc.