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Production system for removing spandex in waste polyester textiles through cyclic premixing

A production system and textile technology, applied in the field of waste polyester recycling, can solve environmental damage, waste of resources, reduce melt viscosity and other problems, 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

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 spandex mostly exists in the form of blending, the spandex cannot be completely separated by manual or intelligent sorting systems. This is the difficulty of recycling waste polyester textiles. one
In the spinning process of waste polyester textiles, because spandex is easy to thermally degrade or alcoholyze into low molecular substances, these small molecular substances are easy to react with polyester, which will reduce the crystallinity of polyester, reduce the melt viscosity, and lead to polymerization. The ester fluidity and spinnability deteriorate, while the bulkiness and compression elasticity of the finished fiber decrease, and the defect content and double-length fiber content increase

Method used

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  • Production system for removing spandex in waste polyester textiles through cyclic premixing
  • Production system for removing spandex in waste polyester textiles through cyclic premixing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for removing spandex in waste polyester textiles by circulating premixing. The specific production process 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] Send the crushed waste polyester textiles to the 01 polyester silo and send it to the 03 premix silo through the 02 feeding roller, and at the same time send the 04 N,N-dimethylacetamide storage tank N,N through the 05 feeding metering pump -Dimethylacetamide is injected into the 03 premixing silo to form a mixed solution of N,N-dimethylacetamide and waste polyester textiles, waste polyester textiles and N,N-dimethylacetamide (DMAC / DMA ) The mass ratio is 1:2. The mixed solution is metered into the 06 continuous propulsion reactor for reaction. The temperature of N,N-dimethylacetamide in the 06 reactor is controlled at 100-115°C, the retention time of the mixed solution is...

Embodiment 2

[0050] 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 110-120°C, and the reaction time (retention time) is 1h.

Embodiment 3

[0052] 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 100-110°C, and the reaction time is 1h.

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Abstract

The invention relates to the technical field of waste polyester recycling, in particular to a production system for removing spandex in waste polyester textiles through circulating premixing, which comprises a polyester bin, a feeding roller, a premixing bin and N, N-dimethyl formamide. The system comprises an N, N-dimethylacetamide storage tank, a feeding metering pump, a continuous propulsion reactor, a finished product treatment tank, a conveying belt, a finished product bin, a filter, a condenser, a waste liquid tank, a feeding pump and an N, N-dimethylacetamide recovery system. Waste polyester textiles are used as raw materials, spandex in the waste polyester textiles is removed through a chemical dissolution method, the structure of polyester is not damaged, a continuous production system is established, large-scale recycling of the waste polyester textiles containing a small amount of spandex is achieved, and a foundation is laid for high-value and high-quality utilization of the waste polyester textiles. The production system 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 production system for removing spandex from waste polyester textiles by circulating premixing. 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 spa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/08C08J11/06C08L67/00
CPCY02W30/62
Inventor 何肖钱军顾君朱识王方河史春桥李振
Owner 余姚大发化纤有限公司