Potential of reactive cationization of cotton over mercerization for dyeing characteristics
Many natural fibers present in nature, among all the natural fibers, cotton fiber has vital value, it is widely used because of certain desirable properties and is widely available throughout the world. Reactive dyeing of cotton produces wide range of bright colors and provides excellent color fastness because of covalent bonding between fiber polymers. For dark shades, it is essential to mercerize cotton fabric to increase dye-ability, improve luster but it has some disadvantages,
... tages, mercerization needs specialized machine, high consumption of concentrated caustic soda during mercerization, need to neutralize the fabric after mercerization, use of salt during dyeing, which produces toxic effluent and have high TDS value and that is environmentally unfriendly. To overcome all these problems reactive cationic reagent is used for cotton applied through cationization process, which chemical modify cotton to produce positive dyeing sites of charges on the fabric in the place of existing hydroxyl sites that increases dye affinity, color yield, fixation percentage, produces hygroscopy, dimensional stability and increases fabric strength. For cationization, no need of specialized machine, neutralization and exhaust dyeing of cotton does not require salt for exhaustion. It produces less effluent and less toxicity in effluent which is environmentally friendly, all these advantages makes cationization process cheaper and superior thus cationization has great potential to be replaced with mercerization.