Method for preparing semi-chrome tanning addition agent through waste chrome shavings and application method of semi-chrome tanning addition agent

Abstract

The invention relates to the technical field of tanning waste source utilization and provides a method for preparing a semi-chrome tanning addition agent through waste chrome shavings and an application method of the semi-chrome tanning addition agent. Waste chrome shaving resources can be effectively converted into the semi-chrome tanning addition agent so as to be reused in the leather production and preparation processes, and the dual economic benefits of environment-friendly tanning and reduction of tanning cost are achieved. According to the method for preparing the semi-chrome tanning addition agent through the waste chrome shavings, collagen hydrolysate liquor is obtained through acid hydrolysis of the waste chrome shavings and then modified through unsaturated dicarboxylic acid andtetrakis hydroxymethyl phosphonium salt, the semi-chrome tanning addition agent is obtained, carboxyl functional groups of collagens in the semi-chrome tanning addition agent are increased, the jointpoints of proteins in the obtained semi-chrome tanning addition agent and a chrome tanning agent are increased, thus, combination and absorption of leather treated through the obtained semi-chrome tanning addition agent and the chrome tanning agent are promoted, meanwhile, the obtained semi-chrome tanning addition agent has certain tanning performance and filling property, the crust leather contraction temperature can be increased, and the fullness, elasticity and grain surface flatness of crust leather are improved.

Description

technical field [0001] The invention relates to the technical field of utilization of tanning waste resources, in particular to a method for preparing low-chrome tanning auxiliaries by utilizing waste leather scraps and an application method thereof. Background technique [0002] The leather industry is an ancient industry, which is characterized by high input of raw materials and low output of products. According to the statistics of the British Leather Association, only 20% of the raw leather in tanning is converted into leather. If the lining leather is counted, The utilization rate is also only 31.5%, and the rest forms solid waste due to operations such as slicing, shaving, lapping and grinding leather. At present, the solid waste generated in leather production mainly includes the following types: [0003] ①Leather waste without chromium salt: without the tanning effect of chromium salt, it is easy to extract high-quality collagen; [0004] ② Chromium-containing leat...

AI Technical Summary

Problems solved by technology

[0006] Therefore, aiming at the problems existing in the prior art, the present invention proposes a method of utilizing waste leather shavings to prepare less chrome tanning auxiliaries and its application method, through which the method of utilizing waste leather shavings to prepare less chrome tanning auxiliaries can effectively Converting waste leather shavings resources into chrome-less tanning auxiliaries can be reused in the leather production and preparation process, so as to realize the rational utilization of waste leather shavings, which has double economic benefits of environmental protection and cost-saving tanning, and effectively solves the existing Problems such as processing difficulties, waste of resources, and environmental pollution when waste leather shavings cannot be utilized as resources in the technology