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Leatherworking retanning method using chromium leather scraps

A technology of chrome leather shavings and collagen, which is applied in the field of retanning in tanning production, can solve the problems of high cost, harm, and difficulty in extracting high-quality collagen, and achieves the improvement of strong plastic feeling, comprehensive performance, and retanning good performance effect

Active Publication Date: 2013-08-21
FUJIAN GUANXING LEATHER
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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 reasons, the use of chromium-free leather waste to produce edible gelatin and collagen has the disadvantages of low utilization rate and high cost; edible gelatin and collagen produced from chrome-containing leather shavings have a high chromium content, which does not meet the requirements Food standard, will cause potential harm to human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 200 parts by weight of chrome leather shavings on a dry basis, 1000 parts by weight of water, and 12 parts by weight of sodium hydroxide, hydrolyzed at 98 ° C for 3 hours, filtered, adjusted the pH value of the filtrate to about 7 with sulfuric acid, and dried to obtain collagen protein powder.

[0041] The above 100 parts by weight of collagen powder and 50 parts by weight of acrylic acid monomer were refluxed at 80°C for 1.5 hours, then 200 parts by weight of water were added, and after stirring and dissolving at 80°C, 20% potassium persulfate solution was added for 10 parts by weight, after reacting for 3 hours, the temperature was lowered to below 50° C., and the pH value of the modified product was adjusted to 7.5 with sodium hydroxide to obtain a modified collagen product.

[0042] Wet blue cowhide leather after shaved, weighed, used as the basis weight for the following quantities,

[0043] Rehumidification: 150% water, 35°C, rotate for 30 minutes, control dry, wa...

Embodiment 2

[0048] 200 parts by weight of chrome leather shavings on a dry basis, 1000 parts by weight of water, 18 parts by weight of sodium hydroxide, hydrolyzed at 88 ° C for 1.5 hours, filtered, adjusted the pH value of the filtrate to about 7 with sulfuric acid, and dried to obtain collagen protein powder.

[0049] The above 100 parts by weight of collagen powder and 50 parts by weight of methacrylic acid monomer were refluxed at 80°C for 2 hours, then 200 parts by weight of water were added, and after stirring and dissolving at 80°C, 20% potassium persulfate was added 10 parts by weight of the solution, reacted for 3 hours, lowered the temperature to below 50° C., and adjusted the pH value of the modified product to 7.5 with sodium hydroxide to obtain a modified collagen product.

[0050] Wet blue cowhide leather after shaved, weighed, used as the basis weight for the following quantities,

[0051] Rehumidification: 150% water, 35°C, rotate for 30 minutes, control dry, wash once wi...

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PUM

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Abstract

The invention provides a leatherworking retanning method using chromium leather scraps. The method comprises the following steps of: extracting collagen in the chromium leather scraps by using an alkali method, drying the collagen, performing amidation reaction on the dried collagen and an acrylic monomer in the absence of water, then performing graft copolymerization reaction to prepare a collagen modified substance, and applying the collagen modified substance to retannage of leather. By applying the chromium leather scraps to the leather retannage, the defects of leather color loss and strong plastic feel caused by excessive use of a synthesized retannage material in the retannage can be improved by using the performance of the collagen.

Description

technical field [0001] The invention belongs to the technical field of leather production, and in particular relates to a leather-making retanning method, in particular to preparing a collagen modified product with chrome leather shavings as the main raw material, and applying the modified product to leather-making retanning Methods. 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, accountin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 罗丰旭曾江勇丁志文
Owner FUJIAN GUANXING LEATHER