Method for preparing self-crimping fibers by taking recycled polyester as raw material

A recycled polyester, self-curling technology, applied in fiber processing, fiber chemical characteristics, melt spinning, etc., can solve the problems of poor fiber-forming performance

Inactive Publication Date: 2021-04-27
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to carry out functional recycling of waste polyester materials and overcome the shortcomings of the existing two-component self-crimping side-by-side fibers that are environmentally inert and shape memory materials generally have poor fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing self-crimping fibers using regenerated polyester as a raw material in this embodiment uses raw materials: the high-elastic hydrophobic component A is selected from PTT or PU; the low-elastic hydrophilic component B is selected from PEG or nano-SiO 2 Modified recycled PET.

[0020] The preparation steps of this example are as follows: preparation of the low-elasticity hydrophilic component B, using ethylene glycol as the reaction medium at a temperature of 180°C, and carrying out molecular depolymerization of waste polyester (polyester pulp block, polyester bottle flakes) , so as to generate bishydroxyethyl terephthalate (BHET), dimers and polymers, and the alcoholysis products are polycondensed to prepare recycled PET. Simultaneously adding nano-SiO 2 Modification of the recycled PET obtained by polymerization (physical mixing, adding nano-SiO2 to the recycled PET melt 2 , fully mixed to obtain a hydrophilic low-elasticity regenerated PET compon...

Embodiment 2

[0025] A method for preparing self-crimping fibers using regenerated polyester as a raw material in this embodiment uses raw materials: the high-elastic hydrophobic component A is selected from PTT or PU; the low-elastic hydrophilic component B is selected from PEG or nano-SiO 2 Modified recycled PET.

[0026] The preparation steps of this example are as follows: preparation of the low-elastic hydrophilic component B, using ethylene glycol as the reaction medium at a temperature of 200°C, and molecular depolymerization of waste polyester (polyester fiber) to generate terephthalmic Bishydroxyethyl formate (BHET), dimers and polymers, alcoholysis products, and alcoholysis products are polycondensed to prepare recycled PET. Simultaneously adding nano-SiO 2 Modify the PET obtained by polymerization (in-situ polymerization, add nano-silica to the prepared recycled PET melt, keep a certain temperature for polymerization, and obtain a hydrophilic low-elastic component PET), A recyc...

Embodiment 3

[0031] A method for preparing self-crimping fibers using regenerated polyester as a raw material in this embodiment uses raw materials: the high-elastic hydrophobic component A is selected from PTT or PU; the low-elastic hydrophilic component B is selected from PEG or nano-SiO 2 Modified recycled PET.

[0032] The preparation steps of this example are as follows: preparation of low-elastic hydrophilic component B, using ethylene glycol as the reaction medium at a temperature of 220°C, molecular depolymerization of waste polyester (polyester waste silk) to generate p-benzene Bishydroxyethyl dicarboxylate (BHET), dimer and multimer, alcoholysis products, and alcoholysis products are polycondensed to prepare recycled PET. At the same time, PEG is added to modify the PET obtained by polymerization (chemical copolymerization, alcoholysis product and ethylene glycol monomer undergo a copolymerization reaction to obtain a hydrophilic low-elastic component PLA), and a recycled PET wit...

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Abstract

The invention discloses a method for preparing self-crimping fibers taking recycled polyester as a raw material. The self-crimping fiber is of a spiral parallel structure, wherein the cross section of the self-crimping fiber is 8-shaped or calabash-shaped; and a high-elasticity hydrophobic component A and a low-elasticity hydrophilic component B in a composite mass ratio of (40:60)-(60:40) are subjected to vacuum drying, respectively melted, plasticized and conveyed, and then subjected to composite spinning, drafting and heat setting to obtain the self-crimping fibers taking the regenerated polyester as the raw material. Specifically, when the body surface humidity is increased, the thread pitch of the fibers is increased, and fabric pores are expanded for heat dissipation; and when the body surface humidity is reduced, the thread pitch of the fibers is decreased, and the fabric pores are shrunk for heat preservation; The fibers have good wearing comfort and intelligent regulation and control on heat dissipation and warm keeping, and has the advantages of environmental protection, high-valued utilization of waste polyester, reduction of energy consumption and sustainability.

Description

technical field [0001] The invention relates to the field of textile materials, in particular to a method for preparing self-crimping fibers using regenerated polyester as a raw material. Background technique [0002] Polyethylene terephthalate (PET) is mainly obtained by condensation polymerization of terephthalic acid and ethylene glycol (EG), both of which come from petroleum. PET is widely used in fiber, food packaging and other fields due to its excellent thermal properties, mechanical properties and stability. In recent years, with the improvement of living standards, people's demand for polyester materials is increasing. Due to its strong biological and chemical inertness, PET products bring great convenience to human beings, but the huge amount of waste is also It creates a heavy burden on resources and the environment. Therefore, in line with the sustainable development principle of "green, low-carbon, circular", the recycling and reuse of waste polyester should b...

Claims

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Application Information

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IPC IPC(8): D01D5/22D01D5/253D01D5/30D01D5/08D01D5/12D01F1/10D01F8/14D01F8/16
CPCD01D5/08D01D5/12D01D5/22D01D5/253D01D5/30D01F1/10D01F8/14D01F8/16
Inventor 张须臻南婧文周锦王秀华施强黄飞桥
Owner ZHEJIANG SCI-TECH UNIV
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