Abstract
The effects of anionic surfactants on wool shrinkage were investigated.Wool shrinkage was largest when wool was in sodium salt solution of saturated primary alcohol sulfates at a certain concentration of detergents, in which the concentration was lower than the critical micelle concentration obtained from surface tension. In sodium salt solution of oleyl alcohol sulfate, however, such a phenomenon was not observed, and wool shrinkage became more or less constant when solution concentration was 0.1% and over.Wool shrinkage was smaller when wool was in 0.1% solution of sodium salt of alkyl benzene sulfonate than that in water alone.In the solution of sodium salt of laurate, wool shrinkage was maximum at a concentration around its critical micelle concentration. But in case sodium salt of oleate, no such concentration maximizing the wool shrinkage was observed.Excluding the effect of viscosity, commercial soaps showed nearly a fixed value for wool shrinkage when its concentration was higher than 0.3%.
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