A reactive disperse dye containing a temporarily anionic sulphatoethylsulphone and nonionic disulphide bis (ethylsulphone) groups was applied to cotton/polyester fiber by the exhaust dyeing at a variety of pH and temperature conditions. A monofunctional reactive disperse containing only nonionic disulphide bis (ethylsulphone) groups was also examined, and its dyeing behavior was compared with the bifunctional dye. The bifunctional reactive disperse dye exhibited high exhaustion and fixation values at pH 6 and 120�C.
The results also indicate that the combination of temporarily anionic and nonionic reactive groups of the bifunctional dye provided a significant enhancement in dyeing performance compared to that of the monofunctional dye. The dye also showed very good leveling and fastness properties.
Introduction:
For dyeing cotton/polyester fiber, reactive disperse dyes are well-known. The advantages of these dyes stem from their excellent wet fastness and good coverage of the fiber, which overcome leveling problems on cotton/polyester fiber when using conventional reactive disperse dyes. Attempts have also been made to produce other types of reactive disperse dyes carrying monochlorotriazine and vinyl sulphone reactive disperse groups. Last year, research applied reactive disperse dyes containing sulphatoethylsulphone reactive groups to nylon, silk, and polyester fiber. The dyeing properties of reactive disperse dyes with sulphatoethylsulphone reactive groups were found to be excellent when applied at 95�C and pH 8, exhibiting excellent build-up profiles and wash fastness on cotton/polyester.
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The results also indicate that the combination of temporarily anionic and nonionic reactive groups of the bifunctional dye provided a significant enhancement in dyeing performance compared to that of the monofunctional dye. The dye also showed very good leveling and fastness properties.
Introduction:
For dyeing cotton/polyester fiber, reactive disperse dyes are well-known. The advantages of these dyes stem from their excellent wet fastness and good coverage of the fiber, which overcome leveling problems on cotton/polyester fiber when using conventional reactive disperse dyes. Attempts have also been made to produce other types of reactive disperse dyes carrying monochlorotriazine and vinyl sulphone reactive disperse groups. Last year, research applied reactive disperse dyes containing sulphatoethylsulphone reactive groups to nylon, silk, and polyester fiber. The dyeing properties of reactive disperse dyes with sulphatoethylsulphone reactive groups were found to be excellent when applied at 95�C and pH 8, exhibiting excellent build-up profiles and wash fastness on cotton/polyester.
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This article was originally presented at ATNT 2007, held on 18-20, June 2007, at Kumaraguru College of Technology, Coimbatore, India. H. Najafi, E. Yzdanshenas & A. Rashidi are associated with Islamic Azad University Science and Research Branch, Tehran, Iran, and F. Normohammadian is associated with the Iran Color Research Center, Tehran, Iran.
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