Dyeing behaviors of an easy washing-off reactive dye

Cotton fabric is dyed with a synthesized easy washing-off reactive dye,influences of salt and alkali dosages,fixation temperature and time,and bath ratio on dyeing behaviors are discussed,and dyeing characteristic values such as S(substantivity),E(exhaustion),R(reactivity),F(fixation) of the reactive dyes are determined.The results show that the synthesized easy washing-off reactive dyes feature good dyeing behaviors in reactive exhaust dyeing of cotton fabric,and the optimum dyeing parameters are sodium chloride 60 g/L,sodium carbonate 20 g/L,fixation at 50 ℃ for 60 min with bath ratio 1 ∶ 20.Dyeing with the synthesized reactive dyes can reduce soaping temperature by 20 ℃ compared with conventional reactive dyes,and the cotton dyeings have good color fastness and fixation yield of 57.2%