A Study of Nano Zinc Oxide Using for the Cotton Yarn Dyeing from the Natural Dyes

Abstract

This research was the study of the cotton dyeing with natural dyes and nano zinc oxide. The effect of nano zinc oxide on color values and colors of  cotton dyeing, the small scale dyeing and the optimum conditions for dyeing with nano zinc oxide  by using dye extracted from pterocarpus bark and iron sulphate as mordant were studied. The  nano zinc oxide dyeings were hot and cold dyeings. All samples of dyed cotton yarns were satisfactional evaluated by the clothes weaving groups, and chose the 26 most satisfacted samples for fastness test and the best fastness sample was dyed in small scale. It was found that in natural dyeing with nano zinc oxide,  the concentration of nano zinc oxide didn’t affect on color and color values of cotton yarn but affected on color fastness in washing and light because nano zinc oxide had hexagonal prism crystal lattice and large surface area provided the more dye adsorption,. There were 3 optimum conditions in dyeing ; 1% Ca followed with dye water  0.5% Fe and 0.02% nano zinc oxide,  2%Ca followed with dye water 0.25%Fe and 0.08% nano zinc oxide and dye water with 0.06% nano zinc oxide followed with 1% Ca.