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Method for bleaching cotton fabric by chlorine dioxide

A technology of chlorine dioxide and cotton fabrics, which is applied in the direction of bleaching products, textiles and papermaking, etc. It can solve the problems of low utilization rate of chlorine dioxide, unfavorable bleaching production control, and prolonging the bleaching time, so as to reduce the loss of bleaching and shorten the bleaching time. Bleaching time, the effect of improving the bleaching effect

Inactive Publication Date: 2013-10-02
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the existing method, such as the low utilization rate of chlorine dioxide, chlorine dioxide gas is easy to volatilize from its solution during the bleaching process, and the higher the temperature, the faster the volatilization, resulting in increased production costs and prolonging the bleaching time.
At the same time, the chlorine dioxide bleaching process needs to be kept under the condition of pH less than 7. When the pH reaches 7, chlorine dioxide will quickly decompose in the aqueous solution, which is very unfavorable to the production control of bleaching.

Method used

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  • Method for bleaching cotton fabric by chlorine dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] To 100mL mass concentration is 0.2%ClO 2 Add 2 mL of sulfamic acid solution with a mass concentration of 8% into the solution, and stir evenly. Throw in 5 g of cotton strips to fully submerge. Then add 0.1 g of fatty alcohol polyoxyethylene ether sodium sulfate, control the bleaching temperature at 35°C, maintain the pH value of the bleaching system at 3-4, and stir for about 2 minutes every 30 minutes. After 120 min of treatment, 4 mL of 2 mol / L hydrochloric acid was added to the solution, and stirred evenly. End the experiment after standing for 30 minutes, take out the cloth sample, wash it with 150mL water for 3 times, and put it in an oven at 120°C for 3 hours.

Embodiment 2

[0026] To 100mL mass concentration is 0.3%ClO 2 Add 2 mL of sulfamic acid solution with a mass concentration of 9% into the solution, and stir evenly. Throw in 5 g of cotton strips to fully submerge. Then add 0.15 g of fatty alcohol polyoxyethylene ether sodium sulfate, control the bleaching temperature at 40°C, maintain the pH value of the bleaching system at 3-4, and stir for about 2 minutes every 30 minutes. After 140 min of treatment, add 4 mL of 2 mol / L acetic acid to the solution and stir well. End the experiment after standing for 30 minutes, take out the cloth sample, wash it with 150mL water for 3 times, and put it in an oven at 120°C for 4 hours.

Embodiment 3

[0028] To 100mL mass concentration is 0.5%ClO 2 Add 2 mL of sulfamic acid solution with a mass concentration of 10% into the solution, and stir evenly. Throw in 5 g of cotton strips to fully submerge. Then add 0.2 g of fatty alcohol polyoxyethylene ether sodium sulfate, control the bleaching temperature at 45°C, maintain the pH value of the bleaching system at 3-4, and stir for about 2 minutes every 30 minutes. After 150 min of treatment, 4 mL of 2 mol / L citric acid was added to the solution and stirred evenly. End the experiment after standing for 30 minutes, take out the cloth sample, wash it with 150mL of water three times, and put it in an oven at 120°C for 3.5 hours.

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Abstract

The invention discloses a method for bleaching a cotton fabric by chlorine dioxide. The method comprises the following operating steps: 1, mixing a chlorine dioxide solution with a sulfamic acid solution according to a volume ratio of 50:1, and uniformly stirring; 2, adding cotton cloth strips to a mixed solution obtained in step 1 for fully immersing the cotton cloth strips, adding fatty alcohol polyoxyethylene ether sodium sulfate, and bleaching at 35-45DEG C through stirring for 2min by a stirrer each 30min when the pH value of the bleaching system is 3-4; 3, adding a 2mol / L activator to a solution obtained 120-150min after the bleaching treatment, and uniformly stirring; and 4, allowing a solution obtained in step 3 to stand for 30min, taking out cloth samples, washing with water, and drying in an oven at 120DEG C for 3-4h. The method has the advantages of bleaching efficiency and technological controllability increase, bleaching time shortening, wastewater treatment cost saving, environmental pollution reduction, and obvious economic and social benefits.

Description

technical field [0001] The invention relates to a method for bleaching cotton fabrics with chlorine dioxide. Background technique [0002] Bleaching is a very important process in the textile industry, but the bleaching wastewater is extremely polluting to the environment. For this reason, people in the industry are constantly seeking environmentally friendly bleaching agents, bleaching aids, and processing techniques. At present, most enterprises at home and abroad use sodium hypochlorite method and hydrogen peroxide method to bleach cotton fabrics. The sodium hypochlorite bleaching process is mature, low in cost, and low in energy consumption. It is widely used in the bleaching of cotton fabrics, but it pollutes the environment seriously and produces highly toxic substances such as non-biodegradable adsorbable organic chlorides, which are carcinogenic to the human body. , is a process that should be discarded. The hydrogen peroxide bleaching process is costly, and metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06L3/08D06L3/14D06L4/26
Inventor 黄丽婕王双飞杨莹
Owner GUANGXI UNIV
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