An environmentally friendly dyeing process for cow split leather

A leather and environmental protection technology, applied in the field of environmental protection dyeing process, can solve the problems of limiting the large-scale production and application of bovine two-layer leather, human and environmental hazards of chromium-containing waste liquid, and high content of chromium trioxide, and achieving good environmental protection benefits, color and luster. Full and bright, reducing chromium pollution

Active Publication Date: 2018-05-29
福建省永建皮革科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cow split leather is mainly close to the reticular layer of leather, and is composed of coarse collagen fiber bundles woven in three-dimensional space. The collagen fiber bundles are loosely woven, which limits the scale production and application of cow split leather.
At present, most cow split leather manufacturers mainly improve the strength of leather by adding chrome tanning agent in the re-blending process of leather production. The direct discharge of chromium waste liquid will cause serious harm to human beings and the environment
In addition, the strength of the leather produced through the chrome compounding process is still not high, and the leather is hard, the hand feeling is poor, and the fullness of the leather is not good. Therefore, it is of great significance to apply the new technology to the production of cow split leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An environmentally friendly dyeing process for cow split leather, comprising the following steps:

[0028] (1) Material selection: select leather, weigh it, and place the leather in the drum;

[0029] (2) Degreasing and water return: Add 200% of leather weight water at 35°C and 0.5% leather weight E100 degreasing agent to the drum in sequence, and drain water after rotating for 40 minutes;

[0030] (3) Softening: Add 100% leather weight water at 35°C, 0.5% leather weight with a mass concentration of 0.5% K21 softening enzyme, and 1% leather weight with a mass concentration of 1% ammonia-free deliming agent, adjust the pH to 6.5, and rotate for 30 minutes;

[0031] (4) Tanning: Add 1% leather weight MD-1 melamine retanning agent, 1% leather weight R7 dipolycyanamide, 2% leather weight phenolic syntan JR-309 and 2% leather weight in the drum Aromatic synthetic tanning agent 960 synthetic tanning agent of leather weight, rotate 60min;

[0032] (5) Dyeing: Add 1% leather...

Embodiment 2

[0036] An environmentally friendly dyeing process for cow split leather, comprising the following steps:

[0037] (1) Material selection: select leather, weigh it, and place the leather in the drum;

[0038] (2) Degreasing and water return: add 250% of leather weight water at 30°C and 0.6% leather weight E100 degreasing agent into the drum in turn, and drain water after rotating for 60 minutes;

[0039] (3) Softening: add 110% leather weight water at 30°C, 0.8% leather weight mass concentration of 0.5% K21 softening enzyme and 1.5% leather weight mass concentration of 1% ammonia-free deliming to the drum agent, adjust the pH to 6.5, and rotate for 45 minutes;

[0040] (4) Tanning: add the MD-1 melamine retanning agent of 2% leather weight, the R7 dipolycyanamide of 2% leather weight, the phenolic syntan agent JR-309 of 2.5% leather weight and 2.5% in the drum Aromatic synthetic tanning agent 960 synthetic tanning agent of leather weight, rotate 90min;

[0041] (5) Dyeing: A...

Embodiment 3

[0045] An environmentally friendly dyeing process for cow split leather, comprising the following steps:

[0046] (1) Material selection: select leather, weigh it, and place the leather in the drum;

[0047] (2) Degreasing and water return: add 300% leather weight water at 35°C and 0.8% leather weight E100 degreasing agent to the drum in sequence, and drain water after rotating for 80 minutes;

[0048] (3) Softening: Add 120% of leather weight water at 40°C, 1.0% of leather weight with a mass concentration of 0.5% K21 softening enzyme, and 2.0% of leather weight with a mass concentration of 1% ammonia-free deliming agent, adjust the pH to 6.5, and rotate for 60 minutes;

[0049] (4) Tanning: add the MD-1 melamine retanning agent of 3% leather weight, the R7 dipolycyanamide of 3% leather weight, the phenolic syntan agent DS replacement of 3% leather weight and 3% leather weight in drum Aromatic syntans JHL syntans by weight, rotate for 120min;

[0050] (5) Dyeing: Add 2% lea...

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PUM

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Abstract

The invention discloses an environment-friendly dyeing technology for cattle hide split leather. The cattle hide split leather is obtained through the technology steps of degreasing and water returning, softening, tanning, dyeing, fixing, after treatment and the like. Clean production is emphasized in the technology process, pollution is little, and very good environment-friendly benefits are achieved; and the cattle hide split leather obtained through production is high in strength, good in hand feeling and full and bright in color.

Description

technical field [0001] The invention relates to the field of leather technology production, in particular to an environmentally friendly dyeing process for bovine split leather. Background technique [0002] With the increase of the output of cowhide furniture leather and shoe upper leather, the utilization and development of cow split leather has increasingly become a hot spot in the leather industry. Bovine split leather is mainly close to the reticular layer of leather, and is composed of coarse collagen fiber bundles woven in three-dimensional space. The collagen fiber bundles are loosely woven, which limits the scale production and application of bovine split leather. At present, most cow split leather manufacturers mainly improve the strength of leather by adding chrome tanning agent in the re-blending process of leather production. The direct discharge of chromium waste liquid will cause serious harm to human beings and the environment. In addition, the strength of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08C14C3/08D06P3/32D06P5/04
CPCC14C1/08C14C3/08D06P3/32D06P5/04
Inventor 蒋永芳林树生陈浩
Owner 福建省永建皮革科技股份有限公司
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