Environment-friendly chromium-free leather retanning method

Abstract

The invention provides an environment-friendly chromium-free leather retanning method. The dyeing uniformity and strength of the leather are further improved, and the durability of the leather is improved. The retanning fullness and the filling property of the leather are improved, so that the leather with obviously higher cutting yield is obtained; a traditional retanning agent is designed into astrip-shaped microcapsule form, good filling performance is realized, the flatness of the leather is improved; in addition, the grain defects of the leather are well repaired, and the retanning agentcan be released for a long time under stress or heating through the design of the microcapsules, so that the obtained leather product is more durable; through cooperation of carboxymethyl cellulose,non-chromium metal and acrylic polymers, dyeing is brighter and more uniform, the tinting strength of the surface of the leather is improved, the color fading phenomenon is basically avoided, and theleather can be endowed with better properties such as bacterium resistance and mildew resistance according to needs. The leather process disclosed by the invention is green and environment-friendly, not only does not discharge chromium, but also reduces the use of dyes, and the microcapsule-shaped retanning agent is beneficial to recycling and has good social and economic benefits and applicationvalues.

Description

technical field [0001] The invention relates to the technical field of leather manufacturing. Specifically, the present invention uses an environment-friendly chromium-free new material retanning agent to process leather. Background technique [0002] For a long time, chrome tanning has been mainly used in leather manufacturing at home and abroad, but as we all know, chromium is a heavy metal that will cause environmental pollution, and it is difficult to degrade by general biochemical methods. Although trivalent chromium is used for leather tanning, it is still in the environment. There is a potential danger of generating highly toxic hexavalent chromium. The national hazardous waste list has listed chromium-containing waste generated in tanning production as hazardous waste and requires special treatment. The "Tannery and Fur Processing Industry Water Pollutant Discharge Standard GB30486-2013", which was officially implemented on March 1, 2014, strictly stipulates the ent...

AI Technical Summary

Problems solved by technology

But for the traditional acrylic syntans or their copolymer tanning agents, they will cause the color to be shiny or bleached when the leather is dyed, which will eventually affect the uniformity of the tanned leather and the intensity of the dyeing tone, due to the wrinkled texture of the fur. As a result, the filling uniformity and flatness of the spherical tanning agent on the leather surface are poor, and it is easy to deform during use and has poor durability

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