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Waste leather treatment method

A processing method and leather technology, applied in fiber processing, textile decomposition and recovery, single-component protein rayon, etc., can solve the problems of low extraction rate of collagen fibers, secondary pollution, etc., to improve resource utilization, The effect of improving quality and improving utilization

Active Publication Date: 2017-10-24
台州中知英健机械自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Animal skin is rich in collagen fibers. If the collagen fibers in the leather are extracted and recycled again, the economic benefits will be improved. However, the current process of extracting collagen fibers from leather will produce a large amount of waste liquid, which will cause secondary Pollution, the extraction rate of collagen fibers is not high, the pollution-free treatment and recycling of leather has become a hot spot in environmental protection research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of processing method of waste leather comprises the following steps:

[0027] (1) Leather pretreatment: After washing the leather, soak it in sulfuric acid with a pH value of 6.5 for 12 hours, then wash and dry it, cut the leather into pieces, and then coarsely crush it through 200 meshes for later use. The acid solution is reused 3 times before collection spare;

[0028] (2) Beating: Soak the crushed leather in ammonia water with a pH value of 8, soak at 40°C for 3 hours, then soak and ferment the leather in an aqueous solution containing Bacillus subtilis and Bacillus licheniformis for 2 hours, and then put the leather together with Put the water containing Bacillus subtilis and Bacillus licheniformis into a beater, beat for 1 hour at a rotating speed of 8000rr to obtain pasty collagen fibers, wherein the ammonia water is reused 5 times and collected for later use;

[0029] (3) Squeeze and stretch: spread the pasty collagen fiber on a pass-through water squeez...

Embodiment 2

[0033] A kind of processing method of waste leather comprises the following steps:

[0034] (1) Leather pretreatment: After washing the leather, soak it in hydrochloric acid with a pH value of 6 for 8 hours, then wash and dry it, cut the leather into pieces, and then coarsely crush it through 200 meshes for later use. The acid solution is reused 5 times before collection spare;

[0035] (2) Beating: Soak the crushed leather in ammonia water with a pH value of 7.5, soak at 30°C for 5 hours, then soak and ferment the leather in an aqueous solution containing Bacillus subtilis and Bacillus licheniformis for 1 hour, and then put the leather together with Put the water containing Bacillus subtilis and Bacillus licheniformis into a beater, beat for 2 hours at a rotating speed of 8000rr to obtain pasty collagen fibers, wherein the ammonia water is reused 3 times and collected for later use;

[0036] (3) Squeeze and stretch: spread the pasty collagen fiber on a pass-through water squ...

Embodiment 3

[0040] A kind of processing method of waste leather comprises the following steps:

[0041] (1) Leather pretreatment: After washing the leather, soak it in hydrochloric acid or sulfuric acid with a pH value of 6.2 for 10 hours, then wash and dry it, cut the leather into pieces, and then coarsely crush it through 200 mesh for later use. The acid solution is reused 4 times collected later;

[0042] (2) Beating: Soak the crushed leather in ammonia water with a pH value of 7.8, soak at 35°C for 5 hours, then soak and ferment the leather in an aqueous solution containing Bacillus subtilis and Bacillus licheniformis for 2 hours, and then put the leather together with Put the water containing Bacillus subtilis and Bacillus licheniformis into a beater, and beat for 2 hours at a rotating speed of 8000rr to obtain pasty collagen fibers; wherein, the ammonia water is reused 4 times and collected for later use;

[0043] (3) Squeeze and stretch: spread the pasty collagen fiber on a pass-t...

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Abstract

The invention discloses a waste leather treatment method. The method comprises steps as follows: (1), leather pretreatment: cleaned leather is soaked in acid liquor and then is cleaned and spin-dried, and the leather is cut into pieces and subjected to coarse grinding for standby application; (2), beating: the ground leather is soaked in alkali liquor for 3-5 h at the temperature of 30-40 DEG C, then the leather is soaked in an aqueous solution containing bacillus subtilis and bacillus licheniformis for fermentation, the leather and bacterium-containing water are put in a beater and subjected to beating, and pasty collagenous fibers are obtained; (3), wringing and stretching: the pasty collagenous fibers are laid on a pass-type wringing machine and wrung by the pass-type wringing machine, and the moisture content of the wrung collagenous fibers is 80%; (4), papermaking: the wrung collagenous fibers are added to softwood pulp, and paper is made. The bacillus subtilis and the bacillus subtilis are adopted for fermenting the leather, so that the extraction rate of the collagenous fibers can be increased, the leather treatment effect is good, the utilization value is high, and no secondary pollution is produced.

Description

technical field [0001] The invention relates to the technical field of leather processing, in particular to a treatment method for waste leather. Background technique [0002] There are many kinds of leather products, and their output is large. The amount of discarded leather after human use is quite large, and the amount of discarded leather left after processing by leather goods manufacturers is also quite large. At present, my country does not carry out corresponding classification and better treatment of leather products, which lead to the waste of leather resources. Leather contains natural collagen, and direct discarding of leather will cause a great waste of resources, and it will be directly discarded in the environment. , will occupy a large amount of land resources. Therefore, the treatment of waste leather and the reuse of leather have become the key issues of research. [0003] Leather is denatured and non-perishable animal skin obtained through physical and che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/34D01G11/00D01F4/00
CPCD01F4/00D01G11/00D21H13/34Y02W30/66
Inventor 黄自宇
Owner 台州中知英健机械自动化有限公司
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