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Method for recycling colored polyester fabric

A polyester fabric and colored polyester technology, applied in the field of waste fabric resource utilization, can solve the problems of equipment protection, high water consumption, high energy consumption, etc., and achieve the effects of small strength loss, small water consumption, and low energy consumption

Active Publication Date: 2021-07-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the problems of high energy consumption, high water consumption, high pollution, high emission and personnel and equipment protection existing in the existing colored polyester fabric decolorization process, the present invention provides an energy-saving and environment-friendly decolorization method

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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  • Method for recycling colored polyester fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Decolorized as is: Polyester knitted fabric dyed with C.I. Disperse Red 167 at 2% o.w.f.

[0044] The following methods are used to decolorize colored polyester fabrics:

[0045] (1) Liquefaction process: the dyed polyester fabric is immersed in a 2 g / L dimethyl sulfoxide solution with a pH of 5, and the liquid is squeezed to make the liquid retention rate 100%.

[0046] (2) Decolorization process: put a fabric with a certain liquid rate in the reactor, ozone is input from one end, and tail gas is output from the other end. The ozone inflow rate in the reactor is controlled to 8g / h, and the treatment temperature is 25°C. The time is 3h.

[0047] (3) Post-treatment process: take out the fabric after decolorization, wash 3 times with water at a water temperature of 50°C, and dry.

[0048] The color change of the colored polyester cloth treated by this method is obvious, and the K / S value before and after decolorization is measured with a Datacolor color measuring instru...

Embodiment 2

[0050] Decolorized as is: Polyester knitted fabric dyed with C.I. Disperse Red 167 at 2% o.w.f.

[0051] The following methods are used to decolorize colored polyester fabrics:

[0052] (1) Liquefaction process: the dyed polyester fabric is immersed in a 2 g / L sodium hypochlorite solution with a pH of 5, and the liquification is carried out so that the liquid retention rate is 100%.

[0053] (2) Decolorization process: put a fabric with a certain liquid rate in the reactor, ozone is input from one end, and tail gas is output from the other end. The ozone inflow rate in the reactor is controlled to 8g / h, and the treatment temperature is 25°C. The time is 3h.

[0054] (3) Post-treatment process: take out the fabric after decolorization, wash 3 times with water at a water temperature of 50°C, and dry.

[0055] The color change of the colored polyester fabric treated by this method is obvious, and the K / S value and the bursting strength value of the polyester fabric of this embo...

Embodiment 3

[0057] Decolorized as is: Polyester knitted fabric dyed with C.I. Disperse Red 167 at 2% o.w.f.

[0058] The following methods are used to decolorize colored polyester fabrics:

[0059] (1) Liquefaction process: the dyed polyester fabric is immersed in a mixed solution of 2 g / L dimethyl sulfoxide and sodium hypochlorite with a pH of 5, and the liquid is squeezed to make the liquid retention rate 100%. The dimethyl sulfoxide in the mixed solution The mass ratio to sodium hypochlorite is 1:1.

[0060] (2) Decolorization process: put a fabric with a certain liquid rate in the reactor, ozone is input from one end, and tail gas is output from the other end. The ozone inflow rate in the reactor is controlled to 8g / h, and the treatment temperature is 25°C. The time is 3h.

[0061] (3) Post-treatment process: take out the fabric after decolorization, wash 3 times with water at a water temperature of 50°C, and dry.

[0062] The color change of the colored polyester fabric treated by...

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Abstract

The invention discloses a method for recycling colored polyester fabric, belongs to the technical field of resource utilization of waste fabric, and mainly aims at recycling and color repairing of the colored polyester fabric. According to the method, ozone with strong oxidizing property is combined with dimethyl sulfoxide or a sodium hypochlorite solution to decolorize the colored polyester fabric, so that chromophoric groups of dye on the fabric are destroyed, and thus the purpose of decolorization is achieved; The method has remarkable decolorizing effect on the colored polyester, can achieve a decolorizing rate of 90% or above, the strength damage of a decolorizing process to the polyester fabric is small, and reutilization of the decolorized fabric is facilitated. The method involves fewer chemical reagents and less energy consumption and has less environmental pollution, so that the method meets the requirement of environmental protection.

Description

technical field [0001] The invention relates to a method for recycling colored polyester fabrics, and belongs to the technical field of resource utilization of waste fabrics. Background technique [0002] With the advancement of science and technology and the improvement of consumption levels, the service life of clothing textiles is getting shorter and shorter, and industrial textiles are gradually increasing. According to statistics, my country's total textile fiber processing in 2016 was about 53.8 million tons, of which polyester output was as high as 28.4 million tons, and the amount of waste textiles recycled in that year was about 2.7 million tons. It is estimated that more than 26 million tons of waste clothes are discarded directly in my country every year. In contrast, the recycling rate of waste textiles is extremely low. Polyester (polyethylene terephthalate, PET) is a hydrophobic fiber with extremely low swelling in water and tightly arranged molecular chains. ...

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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IPC IPC(8): D06L4/50D06L4/23D06L4/00D06L4/70
CPCD06L4/50D06L4/23D06L4/70D06L4/00Y02W30/62
Inventor 范雪荣任腊梅娄江飞高卫东袁久刚徐进
Owner JIANGNAN UNIV
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