Research of Salt-free Dyeing of Reactive dyes on Chitosan quaternary ammonium salt Treated Bombyx Mori Silk Fabric

Chitosan quaternary ammonium salt (short for HTCC) was a strong cationic water-soluble polymer. The bombyx Mori silk fabric was treated by HTCC solution and the salt-free reactive dyeing process and properties of modified silk fabric were investigated in this paper. The results showed that salt-free dyeing effect of silk fabric treated with Cibacron Blue FN-G was better when HTCC concentration was 8g/L, the processing temperature was 60 C and the processing time was 35min; the optimum salt-free reactive dyeing process of silk fabric treated by HTCC was: dyeing pH was 8.0, dyeing temperature was 90 degrees C and dyeing time was 70 min; HTCC had obviously promoted dyeing effect, after salt-free dyeing, the dyeing rate, the color fixing rate and the dyeing depth of silk fabric modified by HTCC solution were all increased obviously, and the washing fastness and rubbing fastness were both improved slightly; the smaller molecular weight of chitosan was used to modify to HTCC, the higher dyeing rate and color fixing rate of the treated silk fabric were obtained.