Absorption performance of acid dyes on soybean/casein/polyvinyl alcohol blend fibers

C.I.Acid Blue 113 and C.I.Acid Blue 168 were applied to the dyeing of soybean/casein/polyvinyl alcohol blend fiber(short for double protein fiber) and soybean/polyvinyl alcohol blend fiber(short for soybean protein fiber).The absorption thermodynamic performance of acid dyes on double protein fiber and soybean protein fiber were compared by Langmuir and Langmuir+Nernst absorption equations.The effects of dyeing temperature on the Langmuir+Nernst absorption constants were also investigated.The differences of absorption properties between double protein fiber and soybean protein fiber were analyzed.It was found that Langmuir+Nernst equation can better fit the adsorption of the acid dyes on double protein fiber and soybean protein fiber.The equilibrium absorption of acid dyes on double protein fibers was higher than that of soybean protein fibers.The electrostatic interaction force between Acid Blue 113 and fiber was stronger than that between Acid Blue 168 and fiber.