Abstract
Interaction between disperse dye and surface active agent in water was investigated with the continuous variation method in optical density (Y function) and electro-conductivity. Samples used were 1, 4, 5, 8-tetra-aminoanthraquinone and two kinds of anionic surface active agent, sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (SDBS). In order to simplify the conditions the experiments were made throughout of the concentration of surface active agent below CMC. The experimental results suggested the formation of the compound DmSn and of the socalled “complex” DxSy (D: dye, S: surface active agent) as a result of interaction of the surface active agent used as dispersing agent with both the fine-crystalline dye and the molecularly dissolved dye in aqueous medium (in the case of SDS m:n=1:2, x:y=1:4 and 1:1, in the case of SDBS m:n=1:1, x:y=1:1). From these results it is deduced that in general in the bath of disperse dye an equilibrium like the following may be achieved.
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