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A method for recycling waste polyester-cotton blended fabrics under hydrothermal conditions

A polyester-cotton blending and conditional technology, applied in the field of recycled polyester-cotton fabric hydrolysis, can solve the problems of inability to separate polyester and cotton components, recycling rate of less than 10%, and no reuse, etc., to achieve full high-value utilization , to achieve closed-loop recycling, the effect of small environmental pollution

Active Publication Date: 2021-01-29
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polyester-cotton fabrics account for more than 80% of textiles, but their recycling rate is less than 10%.
However, the chemical method is only applicable to the recovery of a single component, that is, pure cotton and pure polyester
For blended polyester-cotton fabrics, since polyester-cotton fabrics are woven from blended yarns formed by mixing cotton fibers and polyester fibers closely together through fiber mixing or sliver mixing, the polyester and cotton components in the blended fabrics cannot be smoothly and efficiently Separated, so not well reused

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: cyclic hydrolysis of waste polyester-cotton blended fabric

[0032] (1) Raw materials

[0033] 1. Waste polyester-cotton blended fabric, the blending ratio is 65:35;

[0034] 2. Sulfuric acid, acetone;

[0035] (2) Equipment

[0036] Reactor, muffle furnace

[0037] (3) Method

[0038] 1. Tear waste polyester-cotton blended fabrics into strips, put them in a closed reaction kettle together with 0.5% sulfuric acid aqueous solution, and put the reaction kettle into the In the Furnace, start the reaction timing, and the reaction time is 2 h.

[0039] 2. Stir the reacted mixed solution quickly, peel off the cellulose formed by the hydrolysis of the cotton fiber from the unhydrolyzed polyester fiber, then fish out the fibrous polyester filament, and filter the remaining suspension with a medium-speed filter paper. The cellulose and polyester fibers on the sieve are rinsed and dried, and the filtrate is used for later use.

[0040] 3. Continue to drop int...

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PUM

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Abstract

A method for recycling polyester-cotton blended fabrics in a hydrothermal environment belongs to the field of recycling and reuse of waste textiles. The invention firstly hydrolyzes the polyester-cotton blended fabric under the condition of a sulfuric acid catalyst by utilizing a hydrothermal environment to obtain solid-phase polyester fiber and cellulose powder and a liquid-phase hydrolyzate. Under the same conditions, the hydrolyzed solution can be recycled for many times to treat waste polyester-cotton blended fabrics, and after the oligosaccharide in the hydrolyzed solution reaches a certain concentration, hydrothermal dehydration and carbonization can be carried out to obtain high additional carbon materials. The invention is suitable for polyester-cotton blended fabrics composed of arbitrary proportions, belongs to a closed-loop recycling system, and has the advantages of good economic benefit, short technological process, little environmental pollution, and high added value of products.

Description

technical field [0001] The invention relates to a method for circularly hydrolyzing waste polyester-cotton fabrics, which belongs to the technical field of recycling waste polyester-cotton fibers and preparing chemical substances. Background technique [0002] People's living and consumption levels are constantly improving, the service life of textiles is shortening sharply, and waste textiles are increasing year by year. However, the continuous increase in the use of textile raw materials has caused many problems such as a sharp decrease in the area of ​​cultivated land and an increase in the price of raw materials. At the same time, the recycling efficiency of waste textiles produced by replacement is extremely low. Caused a great waste of resources. According to statistics, in 2016, the output of waste textiles in my country reached 26 million tons. Among them, polyester-cotton fabrics account for more than 80% of textiles, but their recycling rate is less than 10%. A...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/16C01B32/05
CPCY02W30/62
Inventor 史晟阎智锋侯文生张美玲高立斌戴晋明
Owner TAIYUAN UNIV OF TECH
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