Mechanism of benzyl alcohol on acrylic fibers dyed with cationic dyes

The dyeing behavior of Cationic Turquoise Blue X-GB to acrylic fibers has been investigated under three conditions,namely,dyeing at 85 ℃ without accelerant,dyeing at 85 ℃ with accelerant(benzyl alcohol),and conventional boiling dyeing.The influence of benzyl alcohol on the kinetics and thermodynamics of the dyeing of acrylic fibers with cationic dye was studied.The results show that both increasing dyeing temperature and adding benzyl alcohol increase the equilibrium dye-uptake,dyeing rate constant,diffusion coefficient and activated energy and decrease half-dyeing time for acrylic fiber dyed with Cationic Turquoise Blue X-GB.Meanwhile,the partition coefficient,standard affinity and dye saturation value are also enhanced drastically.Furthermore,the dyeing of acrylic fibers with cationic dyes at 85 ℃ using benzyl alcohol as a dyeing accelerant is achieved,which effectively increase the dye adsorption of acrylic fibers and reduce the fiber damage caused by high temperature dyeing.