Abstract:

Aiming at the problem of low dye uptake of disperse dye and large consumption of auxiliaries in the dyeing of hydrophobic fibers, the crystalline form of disperse dye was modified by solvent method to obtain the crystal forms of dyes, which were more easily dispersed and adsorbed, so as to improve dyeing efficiency. The crystal form of disperse red 73 was changed by recrystallization using N,N-dimethyl formamide and benzene, respectively. The crystal form I and II from original form were obtained respectively. The different crystal forms of dye dispersions were prepared by grinding the mixture of the dye and polymer dispersing and the micro-polyester fabric was dyed by using dispersion of the different crystal forms. The effect of crystal forms on the grinding efficiency and stability of the dye dispersion and dyeing property of fabric was studied, compared with the original crystal form of disperse dye. The results show that when dyes of different crystal forms are dispersed to about the same diameter size, the dye of crystal form I has the highest grinding efficiency, the highest stability of dispersion and the optimum dyeing bihavior.

Key words: disperse dye, crystal form, fispersing agent, particle size of dye, dyeing behavior