Pigment Dyeing

Pigment dyeing is an electrical process whereby the textile to be dyed are first given an electrical charge and the pigments are given the opposite charge. Then when the charged textile material is introduced in the pigment bath, the opposite charges will attract and so the pigments will travel to the textile material surface.

In practice the pigments are given a slightly negative charge while the textile material is give a positive charge. Pigment dyeing process occurs in three steps.

1.    Cationisation: by cationisation the fabric is given a positive charge. This is achieved with the help of cation imparting agent and acetic acid.

2.    Dyeing: for dyeing, first the pigment is prepared by adding an anionic dispersing agent. This will give negative charge to the pigment. After preparation of the pigment, the textile material is then introduced in the bath where the opposite charges on pigment and textile material creates a force of attraction and so the pigment molecule travel towards the textile material and sit on the surface of the textile material.

3.    Fixation: by fixation the pigment is bound on to the textile material. This is done with the help of non-ionic or cationic binder. Curing is done at high temperatures.


To know about pigment dyeing procedure please follow the link below
http://texwiz101.blogspot.com/2012/04/pigment-dyeing-by-exhaust-process.html#axzz1sjnGgmbj