The application of chitosan to polyamide fabric dyeing

Owing to existing problems of poor levelness and wet fastness in polyamide fabric dyeing with weak acid dye, reasonable dyeing process was put forward, that is the polyamide fabric was pretreated with chitosan and then dyed with weak acid dye. As a result, with weak acid dye, pH value of dyeing liquor greatly affected the dyeing property; the K/S value increased 90%, from 1.946 up to 3.706; rubbing fastness of both dry and wet reached 5 grade; soaping fastness reached 4 ~ 5 grade; staining fastness of white cloth reached 4 grade.