Optimizing cold pad-batch dyeing of silk fabric with reactive dyes

In order to better control the cold pad-batch dyeing of silk fabric with reactive dyes,this paper discussed the optimal conditions of cold pad-batch dyeing process of silk fabric with vinylsulfone reactive dye and hetero-bifunctional-group reactive dyes based on analysis of the relationship between the change of K/S value during dyeing process and the factors such as alkali,pad-batch temperature,neutral salt and dispersant,using K/S values as the index of fixation effect.The results showed that the satisfactory dyeing effect of silk fabric by cold pad-batch process can be obtained by using the alkaline agent composed of soda ash and caustic soda,with 20 g/L Na2CO3,1-5 g/L NaOH,0-20 g/L NaCl and 0-1 mL/L dispersant batching up for 8-12 h at 25-30 ℃,as well as applying appropriate process conditions according to the types of dyes.