Abstract: This paper studied the dyeing effect of di-hexyl dimethyl ammonium bromide (DDAB) as the dyeing accelerating on dyeing silk with three reactive dyes and the adsorption kinetics of dyeing. The results showed that DDAB had an efficient stimulative role in dyeing silk with reactive dyes. The balanced dye uptake of reactive red B-3BF, reactive yellow B-4RFN and reactive dark blue B-2GLN was 98.7%, 98.4% and 97.3%, respectively. And accordingly the fixation of three reactive dyes was 98.2%, 97.4% and 96.3%, respectively. The exhaustion of three reactive dyes reached the highest basicly, when the concentration of DDAB was 2.24g/L, 2.72g/L and 3.60g/L, respectively. The kinetics of three reactive dyes on silk with DDAB as accelerant was found to fit the pseudo second-order sorption kinetics equation well. Meanwhile the activation energy of reactive red B-3BF, reactive yellow B-4RFN and reactive dark blue B-2GLN dyeing on silk with DDAB as accelerant was 18.23, 14.83 and 15.75 kJ/mol, respectively.

Key words: dihexyl dimethyl ammonium bromide , reactive dye , silk, dyeing , kinetics , activation energy