分散染料の高温分散性に及ぼす界面活性剤混合の影響

概要

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The effects of the mixing of various types of surfactants on the dispersion in aqueous systems of an azo-type disperse dye at high temperatures have been studied as a function of the mixing ratio of surfactants. The dispersion of the disperse dye in mixed surfactant solutions depends strongly upon the chemical composition of ionic surfactants, especially, surfactants with phenolic hydroxyl group, and the cloud point of nonionic surfactants. In general, the addition of surfactants, having a complex chemical composition and phenolic hydroxyl group in the molecule, e.g., the Na salt of formalin condensate of creosote oil sulfonic acid, tends to cause great influence on the dispersion of the dye suspended with other types of surfactants, while the addition of those having a simple chemical composition and no phenolic hydroxyl group, e.g., the Na salt of formalin condensate of β-naphthalene sulfonic acid, tends to cause little influence. Further, the addition of nonionic surfactants having a low cloud point causes great influence on the dispersion of the dye suspended with other types of surfactants, while the addition of those having a high cloud point causes little influence.