Phytolacca pigment dyeing properties for wool fabrics

Natural pigment extracted from Phytolacca was applied to wool fabric,and the dyeing property was investigated.The effect of dye bath pH valne,dyeing temperature and the amount of pigment on the dyed fabrics were analyzed.The adsorption mechanism of Phytolacca pigment on wool fabric and fastness of dyed fabrics were also investigated.The results indicated that K/S value of the dyed wool fabric increased with the increasing amount of Phytolacca pigment.When the amount of pigment was more than 6.0%,K/S values almost remained the same.The K/S values decreased with the increasing of dye bath pH values.When pH was smaller than 3.5,the colour strength values were greater;when pH value was higher than 4.5,the rate of pigment uptake was very low.It was found that while dyeing temperature was below 60 ℃,the color of dyed fabric appeared rose red,and the dyed fabric became yellowish when dyeing temperature exceeded 60 ℃.The washing fastness of fabric dyed in low temperature was lower,and was improved at high dyeing temperature.