Physical Properties of Human Hair Dyed Using Nonionic Surfactants

The influence of different nonionic and slightly cationic surfactants used only in bleaching of hairs before dyeing with C.I. Acid Blue 80 or only in dyeing on tensile stress/strain properties of dyed human hair was examined. The pretreatment of hair fibres before dyeing was carried out in alkali media with hydrogen peroxide in the presence or in the absence of surfactants. The results have shown that when the bleaching of hairs was accomplished in the absence of surfactants, but in the subsequent low temperature dyeing of hair fibres were applied nonionic surfactants, the rate of dye adsorption onto the fibres was enhanced. When polyoxyethylene (25) cocamine or ethoxylated (32) castor oil surfactants or ethoxylated (EO 12) coconut acids fatty amide were applied only in the bleaching of hair fibres, the dyeability was enhanced and the tensile characteristic values of dyed hairs were increased as well