各種界面活性剤による分散染料の高温分散性

概要

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The stabilities of aqueous suspension of azo-type ahd anthraquinone-type disperse dyes dispersed with various types of surfactants at high temperature have been examined. The stability highly depends on the ionic nature and chemical structure of surfactants. With ionic surfactants, stable suspensoins are obtained when a surfactant has a polynuclear aromatic ring (or benzene rings more than 2) and a phenolic hydroxyl group in the molecule. With nonionic surfactants, suspensions are stable when a surfactant has benzene rings more than 2 and a cloud point of 2040°C. This suggests that there exists an optimum hydrophilic-lipophilic balance for the suspensions of disperse dyes when they are dispersed with nonionic surfactants. The results have been discussed in connection with the affinity of surfactants for disperse dyes and the difference in change of dissolution state with increasing temperature between ionic and nonionic surfactants.