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Stripping technology for waste denim rags

A denim and color stripping technology, which is applied in dyeing, textiles, papermaking, and dry-cleaning fiber products, can solve the problems of unreachable industrial production, immature technology, and high cost, and achieve good desizing effect, reduce cost and dosage, The effect of using less material

Inactive Publication Date: 2020-07-14
澧县新伟纺织有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These white cloth fragments are processed through opening, bomb cleaning, carding and other processes to produce white recycled cotton with a wide range of uses. At present, my country's recycling industry is basically a cold bleaching process in small workshops, all of which use high-concentration cotton. Sodium chlorite or sodium hypochlorite is soaked for a long time of 12-18 hours. Some companies are also trying the thermal decolorization process, and most of the processes are not mature. At the same time, amylase is mostly used as desizing on the market. agent, and use sodium sulfite and soda ash to dechlorinate, the cost is relatively high, and it cannot reach the level of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of stripping process of waste and old denim, comprising the following steps:

[0024] Desizing: Add 0.5% sodium chlorite by weight of shredded denim and penetrant 0.5% by weight of shredded denim to the dyeing vat, add glacial acetic acid to adjust the pH to 4.0, raise the temperature to 70°C, keep it for 50 minutes, heat it with 90°C water for cleaning;

[0025] Stripping: add trisodium phosphate 0.5% by weight of denim shreds before desizing step, add sodium chlorite 2% by weight of denim shreds before desizing step, add penetrant 0.5% by weight of denim shreds before desizing step , add water to make the bath ratio 1:5, adjust the pH to 3.8, soak at room temperature for 0.5 hours, then heat at a rate of 1°C per minute for 30 minutes, and directly heat to 95°C after the uniform heating is completed and keep it for 60 Minutes, wash with 90 ℃ hot water;

[0026] Bleaching: Add 3% sodium hypochlorite by weight of denim before the desizing step, adjust the pH to ...

Embodiment 2

[0029] The difference with embodiment 1 is only that the selection of technological parameter is different, and other does not change, specifically as follows:

[0030] In the desizing step, add 0.6% sodium chlorite by weight of shredded denim, 0.4% penetrant by weight of shredded denim, add glacial acetic acid to adjust the pH to 4.0, raise the temperature to 65°C, keep it for 45 minutes, and use 90°C hot water to clean;

[0031] In the stripping step, add trisodium phosphate 0.6% by weight of denim shreds before desizing step, add sodium chlorite 2.2% by weight of denim shreds before desizing step, add 0.4% by weight of denim shreds before desizing step Add water to make the bath ratio 1:5, adjust the pH to 4.0, soak at room temperature for 0.5 hours, then heat at a rate of 1°C per minute for 30 minutes, and directly heat to 95°C after the uniform heating is completed And keep for 60 minutes, wash with 90 ℃ hot water;

[0032] In the bleaching step, add 3.5% sodium hypochl...

Embodiment 3

[0035] The difference with embodiment 1 and 2 is only that the selection of technological parameter is different, and other does not change, specifically as follows:

[0036] In the desizing step, add 0.7% sodium chlorite by weight of shredded denim, 0.4% penetrant by weight of shredded denim, add glacial acetic acid to adjust the pH to 4.0, raise the temperature to 80°C, keep it for 40 minutes, and use 90°C hot water to clean;

[0037]In the stripping step, add trisodium phosphate 0.7% by weight of denim shreds before desizing step, add sodium chlorite 2.5% by weight of denim shreds before desizing step, add 0.3% by weight of denim shreds before desizing step Add water to make the bath ratio 1:5, adjust the pH to 4.0, soak at room temperature for 0.5 hours, then heat at a rate of 1°C per minute for 30 minutes, and directly heat to 95°C after the uniform heating is completed And keep for 60 minutes, wash with 90 ℃ hot water;

[0038] In the bleaching step, add 4.0% sodium hy...

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Abstract

The invention relates to a stripping technology for waste denim rags. The technology includes the following steps that desizing is performed firstly, sodium chlorite and a penetrating agent are added,glacial acetic acid is added to adjust the pH to be 4.0, the temperature is increased to range from 60 DEG C to 80 DEG C and is kept for 30-45 min, then stripping is performed, trisodium phosphate, sodium chlorite and a penetrating agent are added, an organic acid is added to adjust the pH to be 4.0, the rags are soaked at room temperature for 0.5 h, then the temperature is increased at the temperature increasing speed of 1 DEG C / min for 30 min, the temperature is directly increased to 95 DEG C and is kept for 60 min after constant-speed temperature increasing is completed, then bleaching isperformed, sodium hypochlorite is added, the pH is adjusted to range from 9 to 11, the rags are soaked at room temperature for 40-80 min, dechlorinating is performed finally, hydrogen peroxide is added, a circulating pump is started, the temperature is increased to range from 50 DEG C to 60 DEG C and is kept for 30-50 min, and the rags are cleaned with hot water at the temperature ranging from 80DEG C to 90 DEG C finally. The technology is low in cost and short in stripping time, consumes few materials and can meet industrial production requirements.

Description

technical field [0001] The invention belongs to the technical field of recycling waste and old textiles, and in particular relates to a process for stripping waste and old denim shreds. Background technique [0002] The stripping process of waste denim shreds includes three core processes: desizing, stripping, and bleaching. Through a series of treatments, the scraps of waste denim of different colors are transformed into white cloth scraps with a certain degree of whiteness and basically the same whiteness. These white cloth fragments are processed through opening, bomb cleaning, carding and other processes to produce white recycled cotton with a wide range of uses. At present, my country's recycling industry is basically a cold bleaching process in small workshops, all of which use high-concentration cotton. Sodium chlorite or sodium hypochlorite is soaked for a long time of 12-18 hours. Some companies are also trying the thermal decolorization process, and most of the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06L1/14D06P5/13D06L4/23
CPCD06L1/14D06L4/23D06P5/137
Inventor 熊荣洪熊文杰
Owner 澧县新伟纺织有限责任公司
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