Polyester-containing waste textile decolorization process capable of realizing solvent circulation

A technology for recycling waste textiles and solvents. It is applied in textiles and papermaking, solvent treatment, textile material treatment, etc. It can solve the problems of easy environmental pollution, high polarity and easy volatility.

Inactive Publication Date: 2018-01-16
ZHEJIANG LUYU ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For thermoplastic polyester PET, the dye molecules are dispersed in the molecular voids of PET. On the premise of not destroying the molecular structure, the decolorization is usually extracted with highly polar solvents, such as dimethyl sulfoxide, DMF, THF, etc., such solvents The decolorization effect is good, but it is highly polar and volatile, has certain biological toxicity, and is easy to cause pollution to the environment

Method used

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  • Polyester-containing waste textile decolorization process capable of realizing solvent circulation
  • Polyester-containing waste textile decolorization process capable of realizing solvent circulation
  • Polyester-containing waste textile decolorization process capable of realizing solvent circulation

Examples

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Embodiment 1

[0020] Taking the colored polyester waste cloth as the processing object, the alcohol elution decolorization process provided by the application is described in detail; wherein the inelastic black pure polyester is used as the 1# sample; the elastic and textured black polyester containing 95% product is the 2# sample, Elastic and fluffy black products containing 90% polyester are 3# samples; cool-color plush fabrics containing 85% polyester are products of 4# samples; bright-color series plush cloth containing 80% polyester are 5# samples; non-elastic light The color pure polyester is used as the 6# sample; the elastic light-colored product containing 75% polyester is used as the 7# sample.

[0021] ①Decolorization method:

[0022] Two samples of elastic black pure polyester and non-elastic light-colored pure polyester were used for decolorization in different ways. The mass ratio of waste cloth to solvent was 1:40, and the decolorization temperature was 180°C. See Table 1 for...

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Abstract

The present invention relates to a polyester-containing waste textile decolorization process capable of realizing solvent circulation, and belongs to the technical field of solvent or fiber regeneration. Waste cloth to be processed is placed in a reaction kettle, meanwhile a solvent alcohol is added, after decolorization, the discolored waste cloth is reused, and the solvent in the reaction kettleis recovered through alcohol recovery, and put back to the reaction kettle to continue to finish washing and decolorization, and the mass ratio of the waste cloth and the solvent is 1: (1-50). The decolorization is carried out twice. The decolorization temperature is 100-250 DEG C, and the decolorization time is (5-90) min + (0-60) min. The polyester-containing waste textile decolorization process is applied to the recycling of polyester products, and has the advantages of low energy consumption, short cycle and less pollution and the like.

Description

technical field [0001] The invention relates to a process for decolorizing waste textiles containing polyester by realizing solvent circulation, and belongs to the technical field of regeneration of waste textiles. Background technique [0002] The decolorization of waste cloth or waste fiber products is a major technical problem in the recycling of waste textiles. For thermoplastic polyester PET, the dye molecules are dispersed in the molecular voids of PET. On the premise of not destroying the molecular structure, the decolorization is usually extracted with highly polar solvents, such as dimethyl sulfoxide, DMF, THF, etc., such solvents The decolorization effect is better, but it is highly polar and volatile, has certain biological toxicity, and is easy to cause pollution to the environment. Based on this, this application is made. Contents of the invention [0003] In order to overcome the above-mentioned defects in the existing waste cloth decolorization process, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P5/04D06B9/00
Inventor 张朔陈文兴刘雄张建纲石教学高美萍魏建庆陈琳琳张祥
Owner ZHEJIANG LUYU ENVIRONMENTAL PROTECTION
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