Weight reduction and dyeing characteristics of sea-island type ultramicrofiber PET tricot fabric with disperse dye for gray color

Abstract

In this study, we investigated the effects of weight loss ratio and tensile strength under various alkali hydrolysis conditions and NaOH concentrations (10−30% omf). We obtained the optimal weight loss ratio of 24.26% under the alkali hydrolysis conditions of 25% omf NaOH at 110 °C for 60 min. To obtain the optimal dyeing condition for a gray color in reduced sea-island polyethylene terephthalate ultramicrofiber tricot fabric, we conducted the dyeing process under the following conditions; dyeing temperature (95− 135 °C), dyeing time (20−60 min), blue dye content (0.1−0.5% omf), and UV-absorbent content (1−9% omf). The optimal dyeing conditions of the alkali-reduced fabric were 1 g/l dispersant, 1 g/l pH buffer solution, and 3% omf UV-absorbent at 135 °C for 40 min and a goods-to-liquor ratio of 1:10. Under these conditions, the dyed fabrics showed excellent color fastness against washing, rubbing, and light with grades of 4−5.