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Cotton dyeing with natural dye alkannin

LIU Xiang-xia,DU Wen-qin,OU Jin-lian,XIE Zhen-ye,ZHU Yun-jun(College of Textile and Clothing,Wuyi University,Jiangmen 529020,China)  
The effect of extraction method and technology on the amount of extracted pigment is studied,and the mordanting and dyeing technology of alkannin on cotton fabric are researched.The results show that the suitable extraction technology of alkannin by 100% alcohol is extraction bath ratio(quantity of alkannin/anhydrous alcohol) 1 ∶ 20~1 ∶ 30,temperature 40~50 ℃,time 2~4 hours.The suitable mordanting process is that treating with aluminum potassium sulfate of 5 g/L at 70 ℃ for 30 min under pH 3~4,and the optimal dyeing process is that dyeing at 60 ℃ for 30~50 min under pH 4.The dyeing liquor can be reused for 1~2 times.The color fastness of dyeings is dry crocking 4~5 grade,wet crocking 3~4 grade,soaping 4 grade.
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