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Method for separation of terylene-cotton blended fabrics and repolymerization of terylene

A technology of polyester-cotton blending and separation method, which is applied in the direction of plastic recycling and recycling technology, and can solve the problems of low added value of products and decline in cotton fiber performance

Inactive Publication Date: 2011-11-23
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses ethylene glycol, and the depolymerized polyester cannot be polycondensed into linear polyester chips with a certain molecular weight that can be used for spinning, and the performance of cotton fibers is reduced. It is mainly used for papermaking, and the added value of recycled products relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the separation of polyester-cotton blended fabric

[0022] Shred clean and dry waste polyester-cotton blended fabrics with a polyester-cotton blending ratio of 4:1 (that is, the ratio of polyethylene terephthalate (PET) to cotton fiber) into an area of ​​about 4 cm 2 Fragments, take 200Kg. The ethylene glycol and the catalyst zinc acetate are formulated into an ethylene glycol mixture according to the ratio of parts by mass of 1:0.001, and the mixture of waste polyester-cotton blended fabrics and ethylene glycol is added to the mixer with a stirring device according to the ratio of parts by mass of 1:6. Carry out alcoholysis reaction in a high-temperature reactor to obtain a reaction mixture. The alcoholysis reaction temperature is 196°C and the time is 1.5h; filter the reaction mixture at 150°C to obtain solid and liquid substances. After washing with alcohol and then washing and drying with water, pure cotton fibers are obtained; the liquid substance an...

Embodiment 2

[0024] Embodiment 2, the separation of polyester-cotton blended fabric

[0025] Cut clean and dry waste polyester-cotton blended fabrics with a polyester-cotton blending ratio of 1:1 (ie, the ratio of PET to cotton fiber by mass) into an area of ​​about 25 cm 2 Fragments, take 200Kg. The ethylene glycol and the catalyst zinc acetate are formulated into an ethylene glycol mixture according to the ratio of parts by mass of 1:0.001, and the mixture of waste polyester-cotton blended fabrics and ethylene glycol is added to the mixer with a stirring device according to the ratio of parts by mass of 1:4. Carry out alcoholysis reaction in a high-temperature reactor to obtain a reaction mixture. The alcoholysis reaction temperature is 200°C and the time is 1.5h; filter the reaction mixture at 196°C to obtain solid and liquid substances; After washing with alcohol and then washing and drying with water, pure cotton fibers are obtained; the liquid substance and the catalyst ethylene gly...

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Abstract

The invention discloses a separation method of (waste) terylene-cotton blended fabrics. The terylene-cotton blended fabrics are composed of polyethylene terephthalate and cotton fibers. The method comprises the following steps: carrying out an alcoholysis reaction on the terylene-cotton blended fabrics, ethylene glycol and an alcoholysis catalyst to obtain a reaction mixture, wherein the alcoholysis catalyst is zinc acetate; carrying out solid-liquid separation on the reaction mixture to obtain a solid matter and a liquid matter, wherein the solid matter is the cotton fibers; and carrying outa pre-polycondensation reaction and a final polycondensation reaction on the liquid matter in the presence of a polycondensation catalyst to obtain polyethylene terephthalate. By using the separationmethod disclosed by the invention, the (waste) terylene-cotton blended fabrics with various blending ratios are successfully separated to obtain the terylene and cotton fibers.

Description

technical field [0001] The invention relates to a method for separating (waste) polyester-cotton blended fabric and polyester repolymerization. Background technique [0002] China is a big textile country. The annual demand for textile raw materials is more than 35 million tons. Due to the shortage of resources, a large amount of textiles and raw materials need to be imported every year. However, the utilization rate of recycled raw materials in my country is extremely low. It is estimated that the amount of waste textiles is nearly 20 million tons every year, most of which cannot be effectively recycled, resulting in a huge amount of waste textiles, which not only pollutes the environment, takes up a lot of storage space, but also causes a great waste of resources. [0003] Waste textiles can be divided into single-component fabrics and blended fabrics according to their fiber components. At present, the recycling methods of single-component textiles include: one is the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/00C08J11/10C08L67/02C08L1/02
CPCY02W30/62
Inventor 唐世君李智汪少朋石巍赖军梁高勇
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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