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http://dx.doi.org/10.5850/JKSCT.2007.31.12.1754

Improving Dyeability of Safflower Yellow Colorants on Cellulose Fibers  

Shin, Youn-Sook (Dept. of Clothing & Textiles/Human Ecology Research Institute, Chonnam National University)
Cho, A-Rang (Dept. of Clothing & Textiles, Chonnam National University)
Yoo, Dong-Il (Dept. of Textile Engineering, Chonnam National University)
Publication Information
Journal of the Korean Society of Clothing and Textiles / v.31, no.12, 2007 , pp. 1754-1760 More about this Journal
Abstract
To improve poor dye uptake of safflower yellow colorants, cellulose fibers were pretreated with chitosan. The effect of chitosan pretreatment on the dyeability of safflower yellow colorants to cotton, ramie, and rayon was investigated in terms of dye uptake, color, and colorfastness. Irrespective of fiber types, dye uptake increased continuously with increase in chitosan concentration. Chitosan pretreatment improved dye uptake up to 5.6 times for cotton, 7.2 times for ramie, and 3.7 times for rayon. For cotton and ramie, the shade of dyed fabric changed YR color to Y color with increase in chitosan concentration. Dyed rayon fabrics showed Y color irrespective of chitosan concentration. Shades got darker and deeper with increasing chitosan concentration. Shades of chitosan pretreated fabrics were shifted differently depending on dyeing temperature within same fabrics. In common, the color of all dyed fabrics changed to YR at 50 and $70^{\circ}C$ while Y color at 30 and $90^{\circ}C$. V and C value decreased with increase in dyeing temperature and resulted in darker and duller color, in general. Light fastness was fair while washing fastness was poor. It was confirmed that ultrasonic dyeing method enhanced dye uptake more than 30% for cotton and ramie fabrics compared to the conventional automatic machine dyeing method. However, no difference in dye uptake between two dyeing methods was found for rayon.
Keywords
Safflower yellow colorants; Dyeability; Cationization; Colorfastness; Ultrasonic dyeing;
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