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A method for recycling waste textiles using ionic liquids

A technology of waste textiles and ionic liquids, applied in the field of waste textile recycling, can solve the problems of poor mechanical properties, yellowing of regenerated cellulose film, cellulose degradation, etc., to achieve high safety, easy recycling, uniform and mild dissolution process. Effect

Active Publication Date: 2019-02-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this article, the textiles were not properly pretreated, so that the cellulose would take a long time to dissolve in the ionic liquid (more than 6 hours at 80°C, and more than 200 minutes at 120°C), resulting in serious degradation of the recovered cellulose, The obtained cellulose solution is very dark in color, and the regenerated cellulose film is not only yellow in color, but also has poor mechanical properties (tensile strength is lower than 55MPa)

Method used

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  • A method for recycling waste textiles using ionic liquids
  • A method for recycling waste textiles using ionic liquids
  • A method for recycling waste textiles using ionic liquids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, utilizing ionic liquid to recycle waste and used textiles:

[0027] 1) Pretreatment of waste and old textiles: Disinfect and decolorize yellow waste and old cotton textiles sequentially, use sodium hypochlorite aqueous solution (available chlorine content is 8%-12%) as decolorizing agent, bath ratio is 1:20, use 1mol L -1 Adjust the pH value of the sodium hydroxide aqueous solution to 10, and decolorize at 60°C for 20 minutes to remove the dye in the textile, then dry it at 105°C for 3 hours, and crush it into particles with a diameter of less than 2mm to obtain pretreated waste textiles.

[0028] 2) water swelling and ionic liquid dissolution: Dissolve the pretreated waste textiles obtained in step 1) with ionic liquids, the ratio is as follows: 2.002g of pretreated waste textiles, ionic liquid [Amim]Cl 98.041g and 2.023g of water (that is, the mass ratio is 2:98:2), at 70°C and under vacuum conditions (140Pa), stir and dissolve the mixture of the three ...

Embodiment 2

[0031] Embodiment 2, utilizing ionic liquid to recycle waste and used textiles:

[0032] 1) Pretreatment of waste textiles: Sterilize and decolorize blue waste pure cotton textiles sequentially, using sodium hypochlorite aqueous solution (with an available chlorine content of 8%-12%) as a decolorizing agent, with a bath ratio of 1:20, using 1mol L -1 Adjust the pH value of the sodium hydroxide aqueous solution to 10, and decolorize at 60°C for 20 minutes to remove the dye in the textile, then dry it at 105°C for 3 hours, and crush it into particles with a diameter of less than 2mm to obtain pretreated waste textiles.

[0033] 2) Water swelling and ionic liquid dissolution: Dissolve the pretreated waste textiles obtained in step 1) with ionic liquids, and the ratio is as follows: 10.004 g of pretreated waste textiles, 60.973 g of water, and ionic liquid [Bmim] Cl89.997g (that is, the mass ratio is 10:61:90), at 110°C and under vacuum conditions (790Pa), stir and dissolve the m...

Embodiment 3

[0037] Embodiment 3, utilizing ionic liquid to recycle waste and used textiles:

[0038] 1) Pretreatment of waste textiles: Disinfect and decolorize the green waste blended textiles sequentially, using sodium hypochlorite aqueous solution (with an available chlorine content of 8%-12%) as a decolorizing agent, with a bath ratio of 1:20, using 1mol L -1 Adjust the pH value of the sodium hydroxide aqueous solution to 10, and decolorize at 60°C for 20 minutes to remove the dye in the textile, then dry it at 105°C for 3 hours, and crush it into particles with a diameter of less than 2mm to obtain pretreated waste textiles.

[0039] 2) Water swelling and ionic liquid dissolution: Dissolve the pretreated waste textiles obtained in step 1) with ionic liquid, and the feeding ratio is as follows: the quality of the pretreated waste textiles, ionic liquid [Bmim]Ac and water The ratio is 4:96:11. Stir and dissolve the mixture of the three at 90°C and vacuum (220Pa) for 2 hours. During th...

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Abstract

The invention discloses a method for recovering waste textile by the aid of an ionic liquid. The method comprises steps as follows: 1) pretreatment of the waste textile: the waste textile is crushed, and pretreated waste textile is obtained; 2) water swelling and dissolution in the ionic liquid: the pretreated waste textile, the ionic liquid and water are mixed and stirred under the vacuum condition, and a liquid containing cellulose is obtained. After the waste textile is pretreated and swollen in water, the dissolution process is uniform and mild, the dissolution efficiency is high, the effect is good, and the waste textile is thoroughly separated from insoluble matters. A cellulose solution obtained through dissolution can be used for preparing a regenerated cellulose material with excellent performance, and polyester obtained through separation can serve as a polyester raw material to be recycled.

Description

technical field [0001] The invention belongs to the field of recycling waste and old textiles, in particular to a method for recycling waste and old textiles by using ionic liquids. Background technique [0002] There are two main methods for recycling waste textiles. The chemical method is to depolymerize the polymers in the textiles into monomers for recycling; the physical method is to dissolve the polymers and then regenerate them. For waste textiles containing cotton fibers (cellulose), the viscose regeneration method is currently dominant. The viscose regeneration method has a history of more than 100 years from 1904 to today. However, most waste textiles are not composed of a single fiber component, which requires the separation of various blended fiber components in the textile during the recycling process. For the most common cotton fiber / polyester blended textiles in textiles, if cotton cellulose is recovered, the most common method is to first dissolve the cellu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08C08J7/00
CPCY02W30/62
Inventor 张军张晓程余坚
Owner INST OF CHEM CHINESE ACAD OF SCI