Effect of Span40 on dyeing properties of Direct Yellow Brown ND3G onto cotton fabrics in nonionic reverse micelles

In order to improve the dyeing capacity of anionic dyes onto cotton fabric in reverse micelles,the nonionic mixed reverse micelles were prepared by adding Span40 in TX-100 reverse micelles. And the system was used as dyeing medium for dyeing of Direct Yellow Brown ND3 G onto cotton fabric. The effect of Span40 on the structure characteristics of the reverse micelles of maximum water solubilization,water diameter,packing density,conductivity and dyeing properties and the effect of direct dye on the dyeing properties of cotton fabrics were investigated,respectively. The results indicated that the maximum values of the maximum water solubilization were observed when the ratio of Span40 was 50%. The water diameter and packing density of the reverse micelles increased with the increase of the ratio of Span40,which caused the reduction of the conductivity of the reverse micelles. The static repelling force and competitive adsorption between dyes and cotton fabric were decreased with the increase of ratio of Span40,so that adsorption of Direct Yellow Brown ND3 G onto cotton fabric and dyeing properties were improved.