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Non-drainage loose wool successive tank bleaching method

A continuous vat and loose cotton technology, which is applied in the field of textile printing and dyeing, can solve the problems of long bleaching time, low fiber strength, large consumption of chemical additives, and increased sewage treatment burden, so as to improve spinnability, save investment and operating costs , the effect of saving additives

Active Publication Date: 2016-06-01
祝一鸣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there is sewage discharge in the bleaching of cotton cellulose loose fibers
Especially the current popular low-temperature pretreatment bleaching process, in order to achieve bleaching at a low temperature of about 70 degrees, a low-temperature activator of hydrogen peroxide is required, and it is necessary to achieve the removal of cotton fat, cotton wax, and oil stains under high-temperature conditions at low temperatures. If the rate is high, it is necessary to add a large amount of alkali agent and surfactant, resulting in a large consumption of chemical additives and increasing the burden of sewage treatment
[0003] At present, the conventional pretreatment temperature of loose cotton fiber is about 98 degrees. There are also problems such as long bleaching time, large decrease in fiber strength, and it is difficult to achieve a high degree of whiteness. The higher the whiteness achieved, the greater the decrease in fiber strength. Big
After bleaching, the cotton fiber is drained of sewage, and then undergoes processes such as washing, acid neutralization, and softening. Not only the process time is long, water resources are wasted, but also there is sewage discharge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Undrained loose cotton continuous cylinder bleaching method for combed cotton:

[0035] 1) Put the loose cotton fiber directly into the high-temperature and high-pressure bleaching tank, the bath ratio of bleaching is 1: (5–20), add caustic soda 1 g / L, hydrogen peroxide 5 g / L, and ecological additives 2.5 g / L in order . Raise the temperature at 2 degrees per minute to 123 degrees and keep warm for 10 minutes, and seal the bleaching tank to form a high temperature and high pressure environment. After bleaching, without cooling down, the high temperature and high pressure liquid is directly discharged into the auxiliary vat. Recover the discharged high-temperature bleaching liquid, and then re-inject the high-temperature water pump into the bleaching tank for the bleaching process of the next tank.

[0036] 2) After bleaching, the loose cotton fibers are processed by centrifugal dehydration, and the water after centrifugal dehydration is recovered, and then replenished ...

Embodiment 2

[0044] Undrained loose cotton continuous cylinder bleaching method for combed cotton:

[0045] 1) Put the loose cotton fiber directly into the high-temperature and high-pressure bleaching tank, the bath ratio of bleaching is 1: (5–20), add caustic soda 0.7 g / L, hydrogen peroxide 4 g / L, and ecological additive ECO 2 g / L in order . Raise the temperature at 3 degrees per minute to 125 degrees and keep warm for 15 minutes, and seal the bleaching tank to form a high-temperature and high-pressure environment. After bleaching, without cooling down, the high temperature and high pressure liquid is directly discharged into the auxiliary vat. Recover the discharged high-temperature bleaching liquid, and then re-inject the high-temperature water pump into the bleaching tank for the bleaching process of the next tank.

[0046] 2) After bleaching, the loose cotton fibers are processed by centrifugal dehydration, and the water after centrifugal dehydration is recovered, and then replenish...

Embodiment 3

[0053] Non-drained loose cotton continuous cylinder bleaching method of combed cotton-semi-bleaching process:

[0054] 1) The loose cotton fiber is directly put into the high temperature and high pressure bleaching tank, the bath ratio of bleaching is 1: (8–18), add caustic soda 0.6 g / L, hydrogen peroxide 5 g / L, ecological additive ECO 1.5 g / L in order Lift. Raise the temperature at 3 degrees per minute to 125 degrees for 10 minutes, and seal the bleaching tank to form a high-temperature and high-pressure environment. After bleaching, without cooling down, the high temperature and high pressure liquid is directly discharged into the auxiliary vat. Recover the discharged high-temperature bleaching liquid, and then re-inject the high-temperature water pump into the bleaching tank for the bleaching process of the next tank.

[0055] 2) After bleaching, the loose cotton fibers are processed by centrifugal dehydration, and the water after centrifugal dehydration is recovered, and...

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Abstract

The invention relates to a non-drainage loose wool successive tank bleaching method. Clear water and auxiliaries are added to residual liquid in a previous tank each time so that new loose wool fiber in a next tank can be bleached in a circulating mode; all bleaching treatments are free of water drainage. The method has the advantages that the whiteness can reach 87 or higher after successive tank bleaching under a non-drainage condition, color spots and smell do not exist, and bleaching loose wool fiber of different magnitudes of water absorption and different water absorption rates can be obtained by adjusting alkali consumption. By means of a high-temperature and high-pressure efficient bleaching mode, through the high-temperature and high-pressure conditions, the activating rate and permeating rate of hydrogen peroxide are increased, time can be greatly shortened, whiteness can be improved, and the consumption of alkali and surface active agent is lowered. By means of the non-drainage loose wool successive tank bleaching method, the after-bleaching whiteness is higher, hydrophily is good, hand feeling is softer, and spinnability is improved.

Description

technical field [0001] The invention belongs to the field of textile printing and dyeing, and in particular relates to a non-drainage continuous-cylinder bleaching method for loose cotton. Background technique [0002] At present, there is sewage discharge in the bleaching of cotton cellulose loose fibers. Especially the current popular low-temperature pretreatment bleaching process, in order to achieve bleaching at a low temperature of about 70 degrees, a low-temperature activator of hydrogen peroxide is required, and it is necessary to achieve the removal of cotton fat, cotton wax, and oil stains under high-temperature conditions at low temperatures. If the rate is low, it is necessary to add a large amount of alkali agent and surfactant, resulting in a large consumption of chemical additives and increasing the burden of sewage treatment. [0003] At present, the conventional pretreatment temperature of loose cotton fiber is about 98 degrees. There are also problems such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06L3/02D06L4/12D06L4/13
Inventor 祝一鸣
Owner 祝一鸣