Abstract: The paper was mainly research acrylic grafting nylon 66. The cationic dye of Cationic Red 5BL was used to dye the fiber under 95℃. The dyeing properties of modified nylon 66 fiber in mild acidic condition were researched. The grafting modification rate and dyeing kinetics on the Acrylic grafting nylon 66 fibers with cationic dye were studied as well. The results showed that the type of adsorption isotherm of cationic dye on Acrylic grafting nylon 66 fibers was conforming to Langmuir distribution mechanism. Compared with dyeing with cationic dye on the conventional nylon 66 fiber, dyeing with cationic dye on the Acrylic grafting nylon 66 fiber has some features, i.e. the dyeing rate increases greatly, half-dyeing time decreases, diffusion coefficient and dyeing affinity enhance, washing fastness increased half to one degree.

Key words: graft modification, nylon 66, dyeing, dyeing kinetics