What are the decolorizer for the fabric pretreatment?

The purpose of the bleaching is to move out the natural pigment of the cotton fiber and make the cotton fabric with necessary white and improve color brightness of dying. The decolorizer have the sodium hypochlorite, sodium chlorite, hydrogen peroxide, peracetic acid, etc. 

 

1.sodium hypochlorite bleaching 

The sodium hypochlorite is the main reactant of this method. The constitute of the bleaching liquid is similar with the constitute of the sodium hypochlorite, which both should be dechlorinated by the vitriol. 

 

2.sodium chlorite bleaching 

The sodium chlorite is the main reactant of this method. Pad steaming process bleaching liquid is constitute with the sodium chlorite, activator, buffer agent, surfactant, etc. During the process, it may produce the poisonous chlorine dioxide, which is very harmful to the human. 

 

3.hydrogen peroxide bleaching 

The hydrogen peroxide is the main reactant of this method. The constitute of the bleaching liquid is similar with the constitute of the hydrogen peroxide. The hydrogen peroxide and peroxidase bleaching is called for, because which are reduce the pollution to the environment. 

 

4.peracetic acid bleaching 

The peracetic acid is the main reactant of this method. The constitute of the bleaching liquid is similar with the constitute of the peracetic acid. Compared with other bleaching liquid, the peracetic acid have many advantages: 

(1) oxidation potential is similar to the sodium chlorite (2) don’t produce any poisonous, the emission is biodegradable (3) the bleaching is under the weak acid or neutrality condition, which is good for protecting the mechanical property of the fabric. So the peracetic acid bleaching is the best method. 

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