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New typs powder for keeping foodstaff fresh

A hydrosulfite, a new type of technology, applied in dyeing, textile and papermaking, etc., can solve the problems of fast decomposition, easy heat generation, high pollution components, and achieve the effects of slow decomposition, good stability and safe storage.

Inactive Publication Date: 2004-10-27
张立群
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The hydrosulfite is unstable, easy to generate heat and decompose when it is damp, and decomposes faster after being dissolved in water, resulting in a decrease in reducing ability
[0004] 2. Sodium dithionite is a carcinogen, which is harmful to the human body
[0005] 3. The decomposition speed is fast during use. When the temperature of the reducing solution reaches 50°C, there will be a 20% loss in three seconds, and when it reaches 80°C, there will be a 50% loss in three seconds. Therefore, in actual use, in order to make the dyeing bath It has the required reducing power, and the amount of hydrosulfite greatly exceeds the theoretical amount
[0006] 4. The polluting components in the discharged sewage after use are high, causing adverse effects on the environment

Method used

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  • New typs powder for keeping foodstaff fresh

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 300g of thiourea dioxide powder and 700g of sodium chloride powder, mix them, and make hydrosulfite through uniform stirring.

Embodiment 2

[0015] Get 250g of thiourea dioxide powder and 750g of sodium chloride powder, mix them, and make hydrosulfite through uniform stirring.

Embodiment 3

[0017] Get 350g of thiourea dioxide powder and 650g of sodium chloride powder and mix them, and make hydrosulfite through uniform stirring.

[0018] The principle of the strong reduction method of thiourea dioxide is as follows:

[0019]

[0020] Thiourea dioxide decomposes into urea and strongly reducing hyposulfuric acid in alkaline solution.

[0021] The sodium chloride in the novel sodium hydrosulfite of the present invention can be used as a dyeing accelerator and a stabilizer to enhance the stability of the hydrosulfite and facilitate the storage of the hydrosulfite.

[0022] The novel hydrosulfite of the present invention is a white crystalline powder, tasteless and easily soluble in water.

[0023] The invention can be used for denim dyeing, bleaching of cotton, wool and chemical fiber, reducing agent of vat dyes and sulfur dyes, printing of disperse dyes, stripping of textiles, and reprocessing or removing floating colors.

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Abstract

A sodium hydrosulphite powder for dyeing, printing, bleaching, etc is prepared from thiourea dioxide (CH4N2O2S) (20-40 wt.%) and sodium chloride (NaCl) (60-80 wt.%). Its advantages are high stability and reducing power, and no damage to human body.

Description

technical field [0001] The invention relates to a novel sodium hydrosulfite, which is mainly used for denim yarn dyeing, cotton, wool and chemical fiber bleaching, or used as a reducing agent for dyestuffs. Background technique [0002] The hydrosulfite in the prior art is usually formed by adding a certain amount of powdery sodium carbonate and sodium benzoate to sodium dithionite, and mechanically stirring to make the three powdery substances evenly mixed. This is the case with the manufacturing method of sodium hydrosulfite produced. But there is following deficiency in this insurance powder: [0003] 1. The sodium hydrosulfite is unstable, easy to generate heat when exposed to moisture, and easy to decompose. It decomposes faster after being dissolved in water, resulting in a decrease in reducing ability. [0004] 2. Sodium dithionite is a carcinogen and harmful to human body. [0005] 3. The decomposition speed is fast during use. When the temperature of the reducing...

Claims

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Application Information

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IPC IPC(8): D06P1/44
Inventor 张立群
Owner 张立群
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