Abstract
It is known that nonionic surfactant is an effective dyeing accelerator in polyester printing by super heat steaming. In this paper, 4 mol ethylene oxide addition of orthophenyl phenol (OPP-(EO)4) was used as a model compound of dyeing accelerator, and the dyeing behavior was compared with those of OPP and urea. OPP-(EO)4 was more effective than urea to accelerate the polyester printing by super heat steaming, however, it was quite ineffective in aqueous dyeing. An addition of OPP-(EO)4 in dyeing solution was found to decrease the dyeing properties, because the partition coeffi-cient decreased by the increase of the solubility of dye.Furthermore, change of the fine structure of polyester fiber treated with OPP-(EO)4 and OPP was investigated by X-ray diffractometry and dynamic viscoelastic measurement. The fine structure of the fiber was changed markedly by OPP treatment. On the contrary, the change was scarcely observed by OPP-(EO)4.From these results, the effect of OPP-(EO)4 on the dyeing improvement in polyester printing can be considered to increase the dye solubilization and the dye transfer in printing paste during super heat steaming.
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