Abstract: Abstract: The purpose of this research was to reduce dyeing temperature of acrylic fiber, the acrylic yarn was dyed till equilibrium with pure Cationic Turquoise Blue X-GB under the conditions of benzyl alcohol leather dyeing or not at 85℃ and conventional dyeing. The influence of benzyl alcohol on the dyeing mechanism of acrylic fiber with cationic dye was analyzed through kinetics and thermodynamics studies. The results have shown that increasing dyeing temperature and adding benzyl alcohol both can improve the equilibrium adsorption amount of acrylic fibers, dyeing rate constants, diffusion coefficients and activation energy for acrylic fiber dyeing with cationic coroba blue X-GB.The adsorption isotherm obtained was identified to be a Langmuir type. When the temperature increased and benzyl alcohol added the partition ratio and the standard affinity and the adsorption saturation value increased drastically. The paper has achieved the 85 ℃ dyeing of acrylic fiber using benzyl alcohol , which can effectively increase the dye adsorption of acrylic fiber and reduce the damage of fiberbecause of the high temperature dyeing.

Key words: acrylic fiber, dyeing kinetics, dyeing thermodynamics, adsorption isotherms, benzyl alcohol.