Study on the dyeing behaviour of silk fabric with natural dyestuff from chestnut shell

Dyeing experiments were conducted on silk fabric with natural dyestuff from chestnut shell.The optimum dyeing conditions were obtained through orthogonal experiments using dyeing temperature,concentra-tion of dyestuff solution and pH value of bath as factors.Mordant dyeing methods and technologies were dis-cussed with alum as the mordant.The results showed that the optimized silk dyeing process of natural dyestuff from chestnut shell was: dyeing temperature was 95 ℃,the dye concentration was 0.8 X and the pH value was 3.4.The alum post-mordant procedure was: 1.33 g/L of alum,dyed at 45 ℃ for 30 min.The alum pre-mordant procedure was: the dyeing temperature was 95 ℃,the dye concentration was X,the pH value was 3.4 and 20 g/L of NaCl.The dyed silk fabric with the above dyeing processes all had good color fastness,and post-mordant dyeing technology was the best among them.