Comprehensive utilization method of leather castoff

A waste and leather technology, applied in the field of leather production, can solve the problems of low utilization rate, high cost, hazards, etc., and achieve the effects of no secondary pollution, simple method, and improved bonding and filling effects

Active Publication Date: 2007-10-24
XINGYE LEATHER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] ③Colored crust leather waste: mainly the shaved and edged waste of dyed crust leather, including the trimmings from garment factories and shoe factories, which not only contain chromium salts, but also dyes and retanning agents and fatliquor, it is difficult to extract high-quality collagen
Due to production technology reaso...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 200 parts by weight of evenly shaved chrome chips, 1000 parts by weight of water, and 12 parts by weight of sulfuric acid were hydrolyzed at 90°C for 2.5 hours, filtered, and the pH value of the filtrate was adjusted to about 7 with sodium hydroxide, and the collagen hydrolyzate Concentrate to a solid content of about 50%.

[0037] Mix 15 parts by weight of water, 10 parts by weight of melamine, 4 parts by weight of urea, 1 part by weight of triethanolamine and 40 parts by weight of a 37% formaldehyde solution, heat up to 55°C, react for 2 hours, and then add 150 parts by weight of the concentrated The collagen hydrolyzate was reacted for 2 hours and the pH value of the reaction system was maintained at 7-8 with triethanolamine, and the modified collagen hydrolyzate was obtained by cooling.

[0038] Shaved wet blue leather, weighed, used as the basis weight for the following quantities:

[0039]Rehumidification: 150% water, 35°C, 1.5% degreaser, rotate for 30 minutes, ...

Embodiment 2

[0046] 200 parts by weight of evenly shaved chrome chips, 1000 parts by weight of water, and 14 parts by weight of sulfuric acid were hydrolyzed at 95°C for 1.5 hours, filtered, and the pH value of the filtrate was adjusted to about 7 with sodium hydroxide, and the collagen hydrolyzate Concentrate to a solid content of about 50%.

[0047] Mix 15 parts by weight of water, 10 parts by weight of melamine, 4 parts by weight of urea, 1 part by weight of triethanolamine and 40 parts by weight of a 37% formaldehyde solution and heat up to 60°C, react for 1.5 hours, and then add 150 parts by weight of the concentrated The collagen hydrolyzate was reacted for 2 hours and the pH value of the reaction system was maintained at 7-8 with triethanolamine, and the modified collagen hydrolyzate was obtained by cooling.

[0048] Shaved wet blue leather, weighed, used as the basis weight for the following quantities:

[0049] Rehumidification: 150% water, 35°C, 1.5% degreaser, rotate for 30 min...

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PUM

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Abstract

The invention discloses a synthetic utilizing method of leather waste, which is characterized by the following: utilizing each component with collagen, chromate salt and retanned agent in the waste leather completely; improving the combining and filling effect of collagen hydrolysate in the retanned procedure greatly through modifying and coordinating with other retanned agent; simplifying the operation and method without secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of leather production, specifically relates to leather waste treatment, in particular to a method for preparing modified collagen hydrolyzate with leather waste as a main raw material and applying the modified collagen hydrolyzate to leather production. 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, my country has developed into a processing center and trade center of the world's leather industry, with an annual leather processing of 530 million square meters, accounting for more than...

Claims

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Application Information

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IPC IPC(8): C08H1/06C14C3/08C14C9/00
Inventor 蔡建设吴华春姚磊高忠柏
Owner XINGYE LEATHER TECH CO LTD
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