Research on Dyeing Behavior of Silk Fabrics with Cacao Shell Pigment

To study the dyeing behavior of silk fabrics with natural dye cacao shell pigment and ultraviolet-proof performance of dyed silk fabrics,this paper obtains the optimal dyeing process with orthogonal test method and determines UV-light transmittance and UPF value of different dyed silk fabrics. The result shows that the optimal process of direct dyeing with cacao shell pigment is as below: mass fraction of pigment phase to silk fabrics: 2%,p H 5,time 60 min,temperature 70 ℃,bath ratio 1︰50; optimal process conditions of pre-mordant processing method is as below: mass fraction of mordant: 2%,mordant dyeing time 30 min,mordant dyeing temperature 70 ℃,bath ratio1︰50. Silk fabrics can have an improved ultraviolet protection property and obtain good color fastness to rubbing and washing after dyeing with cacao shell pigment,but have a poor light fastness.