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A kind of method of environment-friendly chrome-free retanning leather

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

Active Publication Date: 2022-01-28
河南中牛实业有限公司
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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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  • A kind of method of environment-friendly chrome-free retanning leather
  • A kind of method of environment-friendly chrome-free retanning leather
  • A kind of method of environment-friendly chrome-free retanning leather

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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 to 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 proposes an environment-friendly method for chrome-free retanning of leather, the purpose of which is to further improve the uniformity and strength of leather dyeing, improve the durability of leather, and improve the fullness and filling of leather retanning so as to obtain significantly higher cutting yield. High-efficiency leather, the traditional retanning agent is designed in the form of strip microcapsules, which not only has good filling performance to improve the smoothness of leather, but also repairs the defects of leather texture, microcapsules under stress or heat The unique design enables the retanning agent to be released for a long time, making the leather products more durable, and the combination of carboxymethyl cellulose and non-chrome metals with acrylic polymers makes the dyeing more vivid and uniform, and improves the coloring power of the leather surface. Basically solve the discoloration phenomenon, and can also give the leather better properties such as antibacterial and mildew resistance according to needs. The leather technology of the invention is green and environment-friendly, not only does not emit chromium, but also reduces the use of dyestuffs, and the retanning agent in the form of microcapsules is conducive to recycling and reuse, and has good social and economic benefits and application value.

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 Patents(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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