Synthesis and evaluation of a novel blue cationic reactive dye for modified nylon 6.6 Tactel Coloursafe'

摘要

A novel blue cationic reactive dye (dye 1) based on an azo benzothiazole derivative and possessing an acrylamido reactive group, was synthesised and evaluated on dyeing Coloursafe modified nylon 6.6 at optimum pH. Benzothiazole quaternary dye was chosen as a target as this is known to be very strong chromophically. Evaluation of the technical properties of dye 1 showed that it fixed efficiently to nylon under acidic dyeing conditions. As it was necessary to prove that fixation occurs via a covalent bond, the dyeing properties of a non-reactive cationic dye, (Cl Basic Blue 41), on dyeing nylon 6.6 at optimum pH were evaluated. Cl Basic Blue 41 was similar in structure to dye 1 and would be capable of forming an ion-ion bond with the fibre. Evaluation of the technical properties of dye 1 proved that, in all cases, its fixation efficiency and build-up properties were far better than that of Cl Basic Blue 41.