Study of alkaline reduction and dyeing of polyester fabric in one bath.

Abstract: In order to shorten the traditional process of dyeing and finishing process of polyester fabrics and improve production efficiency, the traditional process of alkali reduction and redyeing was simplified to alkali reduction and one bath dyeing process with high alkali resistant disperse dyes. The feasibility of the new process was analyzed. The stability of alkali resistant disperse dyes in NaOH solutions with different mass concentrations, the influence of polyester oligomers in the dyeing bath on their dyeing properties, and the influence of polyester fiber changes on their dyeing properties were investigated. The results show that the alkali resistant disperse dyes have excellent alkali resistance and can be used in alkali reduction and one bath dyeing process. The alkali reduction accumulated continuously in the dyeing process has no effect on the dyeing performance. When the dosage of dyes is the same, the dyeing results of traditional process and one bath process show high consistency. After alkali reduction, the grooves and pits on the surface of polyester fiber due to alkali etching and the reduction of fiber fineness may affect the color of fabric, among which fineness is the main factor affecting the color depth of fabric after alkali reduction. [ABSTRACT FROM AUTHOR]