Dyeing kinetics of Sorghum Red pigment on nylon

In order to improve the dyeing properties,dye up-taking control,dyeing result prediction and dyeing process optimization of the natural dyes Sorghum Red on nylon,the adsorption kinetic experiments were carried out,and the dyeing mechanism was investigated.Pseudo first-order and pseudo second-order kinetic models were selected to examine the adsorption kinetic data.Some dyeing kinetic parameters of Sorghum Red on nylon fabric were studied,and the influence of dyeing of the electrolyte and surfactants were explored.The results indicated that the adsorption kinetics of Sorghum Red on nylon fabrics could be described by the pseudo second-order kinetic model.The dyeing rates increased with temperature rising,but the half dyeing time reduced with temperature rising.Dyeing rate and the adsorbed at equilibrium were reduced with addition of electrolyte,and illustrated different changes with different surfactants.