The Salt-Free Dyeing on Cotton: An Approach to Effluent Free Mechanism; Can Chitosan be a Potential Option?

Abstract

The present study utilizes salt free dyeing on cotton which would not con tribute to environmental pollution an undertaken to explore pro mising approach to reduce cost of dye process. The salt free dyeing used to dye cotton. In conventional Method of dyeing of cotton with reactive dyes, alkali P H is should maintain in the dye bath. This method requires more electrolytes for exhaustion and alkali for fixation. In this paper the fibre modification technique based on polyacrylamide was discussed. When the fabric is treated with polyacrylamide (chitosan), the primary hydro xyl groups of cellu lose is (part ially) modified into amide groups, which intern leads the cellulose to act like as wool fibre and hence rea ctive dyes can be dyed on cotton at neutral P H in the absence of electrolyte and alkali.