Effect of Chitosan Treatment Methods on the Dyeing of Cotton, Nylon, and PET using Cochineal (III)- Light Fastness and Perspiration Fastness Characteristics -

Abstract

Recently, problems related to the natural dyeing have been addressed. Severer problems have been posed by the elution of metallic ions and dyestuff from dyed fabrics. In order to prevent the elution from the dyed fabrics, it is needed to improve the fastness. Especially, it is the most important measure to improve the fastness to perspiration in terms of human body safety. In this study, we employed chitosan pretreatment method before the dyeing process, anticipating that the pretreatment might improve the fastness. We used Al, Sn, and Cu as mordants and investigated the fastness to light and perspiration of the chitosan treated and dyed fabric specimens. By the chitosan pretreatment, the fastness to perspiration improved, while the fastness to light did not.