New typs powder for keeping foodstaff fresh

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...

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