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Method and production system for removing spandex in waste polyester textiles

A technology for textiles and waste polyester, applied in the direction of products, educts, reagents, etc., can solve the problems of wastewater discharge, failure to meet performance requirements, large quantities, etc., and achieve the effect of short process flow and strong practicability

Pending Publication Date: 2022-04-15
余姚大发化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent can be applied to remove spandex from waste polyester before chain disintegration, but if it is directly used as recycled polyester, it still cannot meet the performance requirements
In addition, this patent needs to squeeze the waste polyester fiber products into the cleaning tank for rinsing. Rinsing produces a large amount of waste water, which cannot be effectively recycled and waste water is discharged.

Method used

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  • Method and production system for removing spandex in waste polyester textiles
  • Method and production system for removing spandex in waste polyester textiles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of concrete production process of the method for removing spandex in waste polyester textiles is as follows:

[0043] The recovered polyester fabric containing 5.8% spandex is crushed, and the crushed fabric fragments are 1-5cm in length and 0.6-0.75g / cm in density 3 .

[0044] Put the crushed waste polyester fabric into the reactor 1, and inject the recovered N,N-dimethylacetamide (DMAC / DMA) solution into the reactor 1 through the feed pump 15, and the waste polyester textiles are mixed with N , The mass ratio of N-dimethylacetamide (DMAC / DMA) is 1:2, the reaction temperature is 70°C, the reaction time is 1.5h, and the stirring rate is 65rpm.

[0045] After the waste polyester textiles in the reactor 01 fully react with N,N-dimethylacetamide (DMAC / DMA), the reaction solution is discharged, filtered through the filter 04, and then recycled to the waste liquid tank 05.

[0046] After the reaction liquid is discharged, continue to heat the reactor 01, raise the t...

Embodiment 2

[0053] As described in Example 1, the difference is: this time the raw material is polyester foam material containing 2.8% spandex, and the mass ratio of waste polyester textiles to N,N-dimethylacetamide (DMAC / DMA) is 1 : 3, the reaction temperature is 70-80°C, and the reaction time is 2h.

Embodiment 3

[0055] As described in Example 1, the difference is: this time the raw material is polyester yarn containing 8% spandex, and the mass ratio of waste polyester textiles to N,N-dimethylacetamide (DMAC / DMA) is 1: 3. The reaction temperature is 70-80°C, and the reaction time is 2 hours.

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Abstract

The invention relates to the technical field of waste polyester recycling, in particular to a method and a production system for removing spandex in waste polyester textiles. According to the method, the waste polyester textiles containing the spandex are used as raw materials, the spandex in the waste polyester textiles is removed through a chemical dissolution method, the removal rate of the spandex can reach 100%, the structure of polyester is not damaged, large-scale recycling of the waste polyester textiles containing a small amount of the spandex is achieved, and a foundation is laid for high-value and high-quality utilization of the waste polyester textiles. The method is low in production cost and easy to operate, the prepared polyester textile can be used for manufacturing polyester bubble materials, regenerated polyester fibers and the like, and sustainable development of the textile industry is promoted.

Description

technical field [0001] The invention relates to the technical field of recycling waste polyester, in particular to a method and production system for removing spandex from waste polyester textiles. Background technique [0002] At present, there are more and more polyester blended fabrics represented by spandex. The fabrics containing spandex are elastic and soft, and the clothes made of them are close-fitting and have no sense of restraint, which greatly improves the comfort of the product. Although it meets the needs of the differentiated clothing market for fabrics, it does not consider the recycling of the blended fabric. According to the statistics of relevant departments, blended fabrics containing 1-3% spandex account for about 60% of the entire textile fabric, and these chemical fibers and other products are not easy to degrade after being discarded. Big waste of resources. [0003] At present, recycled polyester textiles contain a small amount of spandex. Since sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/04C08L67/00
CPCY02P20/143Y02W30/62
Inventor 何肖邢喜全朱识钱军李振杜国强马哲峰五方河
Owner 余姚大发化纤有限公司
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