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Environment-friendly chromium-free leather retanning method

A chrome-free retanning and environment-friendly technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, dyeing method, etc., can solve the problem of easy deformation and leather surface Poor filling uniformity, poor flatness, poor durability, etc., to achieve the effect of improving softness, improving wastewater treatment efficiency, and improving fullness

Active Publication Date: 2020-06-23
河南中牛实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Environment-friendly chromium-free leather retanning method
  • Environment-friendly chromium-free leather retanning method
  • Environment-friendly chromium-free leather retanning method

Examples

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Embodiment 1

[0031] A kind of concrete steps of the method for environment-friendly chromium-free retanning leather are as follows:

[0032] Include the following steps in turn: pretreatment → chrome-free tanning → backwater → chrome-free retanning → neutralization → dyeing, fatliquoring, acid fixation → post-treatment; specifically,

[0033] The pre-treatment process includes: based on the quality of the bare hide, add 120% of water at 25°C and 2% of ammonia-free deliming agent in the drum, rotate for 70 minutes, then add 0.3% softening enzyme, rotate for 40 minutes, and the final bath liquid The pH is 7.5, drain, pickle and wash with water.

[0034] The chrome-free tanning process is: based on the quality of bare hide, add 40% water at 25°C to the drum and rotate for 10 minutes; add 2% silicone modified polyurethane resin and rotate for 60 minutes; add 8% zirconium-aluminum-titanium Rotate for 160 minutes with polymetallic compound tanning agent; then add 0.3% alkali-raising agent and c...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/28C14C1/08D06P1/50D06P1/52D06P3/32
CPCC14C3/28C14C1/08D06P1/50D06P1/5257D06P3/32
Inventor 范恩源祝雷光夏皓帆朱士彬朱秀丽
Owner 河南中牛实业有限公司
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