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A method for preparing recycled polyester staple fibers from waste polyester textiles containing spandex

A technology for recycled polyester and textiles, applied in textiles and papermaking, melt spinning, fiber treatment, etc., can solve the problems of single composition and failure to meet the performance of waste polyester bottle flakes, and achieve the reduction of defect content, increase of breaking strength, and good compatibility effect

Active Publication Date: 2021-12-24
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

Compared with waste polyester textiles, polyester bottle flakes have a single composition and are better than waste polyester textiles in terms of spinnability, especially in the melting and crystallization of waste polyester melts. Waste polyester textiles cannot reach the level of waste polyester. Performance of flakes

Method used

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  • A method for preparing recycled polyester staple fibers from waste polyester textiles containing spandex
  • A method for preparing recycled polyester staple fibers from waste polyester textiles containing spandex

Examples

Experimental program
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Embodiment 1

[0028] Step 1: Put the prepared foam material into a vacuum dryer, and dry it for 8.5 hours at a vacuum degree greater than -0.09MPa and a temperature of 165°C to obtain a spinning raw material with a water content of less than 90ppm.

[0029] Step 2: 0.6wt% styrene-acrylonitrile-glycidyl methacrylate chain extender and 0.2% (mass ratio with foam) nucleating agent (synthetic product produced by Jining Beijia Polymer Material Co., Ltd.) Nucleating agent P-22) is added in the form of weight loss weighing at the screw feed port, and then the three are melted and initially mixed in the screw. As an optimization, in order to maximize the role of chain extenders and nucleating agents, the temperatures of the seven heating zones of the screw are as follows: Zone 1 290°C, Zone 2 295°C, Zone 3 295°C, Zone 4 290°C, Zone 5 288°C , 286°C in the sixth zone and 284°C in the seventh zone.

[0030]Step 3: After the melt is filtered by a filter, it is sent to the liquid-phase tempering and vi...

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Abstract

The invention relates to the preparation of regenerated polyester staple fibers, in particular to a method for preparing regenerated polyester staple fibers using polyester textiles containing polyurethane (spandex) as raw materials. A method for preparing regenerated polyester staple fibers from waste polyester textiles containing spandex. The modification of ester melt eliminates the influence of polyurethane (spandex) on polyester melt, realizes the high-value and high-quality utilization of polyester waste containing polyurethane, and achieves the purpose of maximizing resource utilization.

Description

technical field [0001] The invention relates to the preparation of regenerated polyester staple fibers, in particular to a method for preparing regenerated polyester staple fibers using polyester textiles containing polyurethane (spandex) as raw materials. Background technique [0002] At present, with the improvement of textile technology, there are more and more polyester blended fabrics represented by spandex. Although the demand for fabrics in the differentiated clothing market is met, the recycling of the blended fabrics has not been considered. 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. After long-term accumulation, white pollution will flood and the environment will be severely damaged. In 2019, the total output of China's chemical fiber has reached 58.27 million tons, of which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/08D01D5/088D01D5/14D01F1/10D01F6/92D02G1/00D02G1/20D06B3/04
CPCD01D5/08D01D5/088D01D5/14D02G1/006D06B3/04D02G1/205D01F6/92D01F1/10
Inventor 何肖邢喜全钱军杜芳顾君郭学伟马哲峰
Owner 余姚大发化纤有限公司