Dyeing of chemically modified cotton fabric

Abstract

The effect of concentration of three different N-methylol acrylamide derivatives, <b>pH</b> of finishing bath, curing temperature and type of catalyst on the extent of reaction of N-methylolated derivatives with cotton fabric has been studied with a view to obtain good fabric performance with better resiliency. The reactive compounds used were bis(N-methylol-2-carbamoylethyl) butylamine (<b>I</b>), N-(N,N-dimethylol-2- carbamoylethyl)diethylamine (<b>II</b>) and N-(N, N-dimethylol-2-carbamoylethyl) dimethylamine (<b>III</b>). The chemically modified cotton fabric was dyed with an acid dye (Polar Red RS) which has no affinity for cotton. Factors affecting the dyeability have also been studied. It is observed that the colour strength and dry crease recovery of the dyed finished fabric increase with the increase in the concentration of reactive compounds and dye. The colour strength of the dyed modified fabrics is higher for reactive compound <b>II</b> followed by <b>I</b> and <b>III</b>. Higher crease recovery values obtained in case of compound <b>III </b>are attributed to the formation of complex crosslinked cellulose which reduces reactivity towards dyeing.