Ecological automobile leather manufacturing method by adopting novel enzyme unhairing

Abstract

The invention relates to a manufacturing method of cow leather, and particularly relates to an ecological automobile leather manufacturing method by adopting novel enzyme unhairing. The method comprises the following processes: 1) a pre-tanning process; 2) a combined tanning process; 3) a dry finishing workshop section process; and 4) a coating workshop section process, wherein the pre-tanning process comprises the following steps: soaking in water; enzyme unhairing; liming; deliming and softening; and tanning by salt-free non-dipping acid. The enzyme unhairing step adopts an enzyme unhairing formula system consisting of an enzymic preparation, a degreasant, a liming agent, sodium bisulfide, a small amount of lime and sodium sulphide. The enzyme unhairing formula system comprises the following main components in percent by weight: 0.2-0.3% of enzymic preparation, 0.1% of degreasant, 0.3% of liming agent and 1.8% of sodium bisulfide. The method provided by the invention overcomes the deficiencies that enzyme in cow leather production is slow to permeate and small hair is not easy to remove thoroughly, and prevents hair shafts from being dissolved, and cow hair integrally falls from pelt. Meanwhile, the stability of the product can be improved, and the method is free from environmental pollution.

Description

technical field [0001] The invention relates to a method for producing cow leather, in particular to a method for producing ecological automobile leather using a novel enzymatic depilation method. Background technique [0002] The current leather production process is: soaking→liming→deliming without ammonia→pickling→pre-tanning with organic tanning agent→shaving of wet white skin→organic combined tanning→filling→dyeing→fatliquoring→squeezing and stretching→grinding → Breaking soft → Finishing → Finished product. The hair-preserving and depilating process that is concerned at home and abroad mainly uses the immune effect of lime on the hair shaft to preserve the hair and alkali sulfide to destroy the disulfide bond in the hair root protein to remove the hair to complete the depilation process. [0003] However, studies have shown that in the current hair preservation and depilation process, the hair shaft is dissolved, the content of sulfur and COD in the wastewater is high...

AI Technical Summary

Problems solved by technology

[0003] However, studies have shown that the hair shaft of the current hair preservation and depilation process is dissolved, the content of sulfur and COD in the wastewater is high, the growth of anaerobic microorganisms in the sludge is vigorous, and the pollution of nitrogen and hydrogen sulfide is serious.

Moreover, due to the special structure of cowhide fiber tissue, the difficulty of hair preservation and depilation lies in the slow penetration of cowhide hair preservation and depilation, and the defects of small hairs that are not easy to remove. At the same time, there are process operation habits and quality and safety problems. It is difficult to achieve both hair preservation and depilation while ensuring product quality.