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Enzyme treatment and recycling method for protein fibers in waste textiles

A technology for waste textiles and protein fibers, applied in fiber processing, biochemical fiber processing, textiles and papermaking, etc., can solve problems such as inability to distinguish soluble fiber components, difficulty in classifying dyes and blended fibers, and inability to fully recycle and dissolve fibers. To achieve the effect of full utilization, mild conditions and high selectivity

Active Publication Date: 2014-02-05
浙江省轻工业品质量检验研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical recycling method requires complex pre-processing equipment, high cost, complicated recycling process, and difficult classification of dyes and blended fibers
Chemical recovery often requires strong oxidant hypochlorite solution or other organic solvents to dissolve protein fibers, which is costly and easy to cause environmental pollution, and cannot distinguish fiber components with similar solubility. The presence of some dyes may even cause fiber Unable to fully recover and dissolve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Enzyme treatment of silk from silk / viscose fiber / polyacrylonitrile fiber blended waste textiles dyed with Acid Bright Yellow 2G

[0024] (1) Through microscope observation and infrared absorption spectrum, it is determined that the dye type is acid bright yellow 2G, and the waste textile contains silk, viscose fiber and polyacrylonitrile fiber components;

[0025] (2) Acid Bright Yellow 2G is an acid dye, which has little effect on enzyme activity, so no pretreatment is required;

[0026] (3) Add proteinase K to 10 grams of the above-mentioned waste textiles for treatment; the treatment conditions are: 5% proteinase K enzyme amount, tris-hydrochloric acid buffer pH7.5 (ionic strength is 100mM), textiles and buffer The mass ratio of liquid is 0.1:1; the reaction temperature is 65°C, and the treatment time is 18h;

[0027] (4) The solid-liquid separation is carried out on the material after the treatment is finished; wherein the proteinase K in the degradation solution i...

Embodiment 2

[0029] Enzymatic treatment of wool from wool / polyester blended waste textiles

[0030] (1) Through microscope observation and infrared absorption spectrum, it is determined that the waste textiles contain wool and polyester components;

[0031] (2) 50 grams of the above-mentioned waste textiles are pretreated with manganese peroxidase to promote the enzymatic hydrolysis reaction in the next step; the treatment conditions are: 2.5% manganese peroxidase enzyme amount, disodium hydrogen phosphate-potassium dihydrogen phosphate buffer The pH of the solution is 7.5 (ionic strength is 50mM), the mass ratio of textile to buffer is 0.25:1; the temperature is 55°C, and the pretreatment time is 3h;

[0032] (3) After pretreatment, the fabric is treated with pepsin. The treatment conditions are: the amount of protease is 5%, the pH of acetic acid-sodium acetate buffer is 3.9 (ionic strength is 150mM), and the mass ratio of textile to buffer is 0.15:1 ; Reaction temperature 37°C, treatme...

Embodiment 3

[0035] Enzyme Treatment of Rabbit Hair in Rabbit Hair / Cupro Fiber / Polypropylene Fiber Blended Waste Textiles Dyed with Reactive Orange X-G

[0036] (1) By microscope observation and infrared absorption spectrum, it is determined that the dye type is a reactive dye, and waste textiles contain rabbit hair and cupro fiber / polypropylene fiber components;

[0037] (2) 90 grams of the above-mentioned waste textiles are pretreated with fungal laccase to promote the enzymatic hydrolysis reaction in the next step. The treatment conditions are: 3.5% fungal laccase enzyme amount, disodium hydrogen phosphate-citric acid buffer pH3.0 (ion The strength is 200mM), the mass ratio of textile and buffer is 0.17:1; the reaction temperature is 60°C, and the degradation time is 6h;

[0038] (3) After pretreatment, the fabric is treated with keratinase. The treatment conditions are: keratinase enzyme amount 6%, acetic acid-sodium acetate buffer pH 4.5 (ionic strength is 500mM), and the mass ratio of ...

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Abstract

The invention relates to an enzyme treatment and recycling method for protein fibers in waste textiles. The provided method aims to effectively realize the recycling of the protein fibers in the waste textiles. According to the technical scheme provided by the invention, the enzyme treatment and recycling method for the protein fibers in the waste textiles sequentially comprises the following steps: (1) continually carrying out following treatment steps on the waste textiles containing the protein fibers; (2) adding oxidordeuctase into dyed textiles which are directly treated by a direct dye, an active dye, an insoluble azo pigment or a cationic dye, and carrying out pre-treatment; (3) adding protease into the waste textiles treated by the step (2), and carrying out selective degradation on the protein fibers; and (4) carrying out solid-liquid separation on a substance treated by the step (3); carrying out ultra-filtration separation on the protease in a degraded solution and reutilizing, wherein a degraded product is used for producing relative products; and physically recycling the residual solid textiles.

Description

technical field [0001] The invention belongs to the field of recycling waste textiles, and in particular relates to the degradation and recycling of protein fibers in waste textiles by using a protease treatment method. Background technique [0002] With the improvement of living standards, consumers' demand and update speed for textiles are getting faster and faster, and a large amount of waste textiles are produced every year. According to the calculations of relevant experts, the total amount of leftover waste and household waste textiles produced by my country's textile industry in the production process exceeds 26 million tons every year. Waste textiles are "misplaced resources". Especially in the context of resource shortage, the recycling of waste textiles has attracted the attention of countries all over the world. However, my country's comprehensive utilization rate of waste textiles is very low, far behind the world's advanced level. Therefore, the "Twelfth Five-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M16/00C08J11/10D06M101/10
CPCY02W30/62D06M16/003D06M2101/10D06M13/295D06M13/292D06M13/298D06M11/09
Inventor 杨志清陈建华王一薇赵欣刚叶翔宇沈晔
Owner 浙江省轻工业品质量检验研究院
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