The current research investigated the dyeing properties on cotton and PLA fabrics of the sulphatoethylsulphone reactive-disperse dye synthesized from coupling reaction between aminophenyl-4-(β-sulphatoethylsulphone) diazonium salt and N,N-diethyl-m-toluidine, a preliminary study aiming to develop the dye for one-bath dyeing for PLA/cotton blended fabric. From the study, the optimum dyeing condition of the synthesized dye on PLA fabric was at pH 6 and 110°C. The synthesized dye performed very well on PLA rather than cotton. The dyed PLA fabric also displayed excellent color fastnesses to washing and crocking. A study on cotton dyeing gave the information that the dyeing ability of the dye was enhanced by increasing dyeing temperature and the amounts of added salt and alkali. The dyed cotton fabric exhibited a moderate to good color fastnesses to washing and crocking. A nearly similar shade obtained on PLA and cotton encourages a dyeing process development for PLA/cotton blended fabric.
Sulphatoethylsulphone reactive-disperse dye was synthesized via diazotization reaction of aminophenyl-4-(β-sulphatoethylsulphone) followed by coupling reaction of the diazonium salt with phenol as a coupling agent. The synthesized dye was well dyeable on both natural and synthetic fibers with providing orange shade on cotton, silk and nylon, while the dyed PLA and PET fibers appeared in yellow shade. The dyeing conditions for cotton and silk could be conducted using 60 g/l Na2SO4 and 20 g/l Na2CO3 at 60°C for 90 minutes whereas dyeing on PLA and PET fibers was optimally done at 110°C for 30 and 45 minutes for PLA and PET, respectively. In case of nylon, it could be dyed at 100°C for 15 minutes. The synthesized reactive-disperse dye could well dye on these 5 fibers with excellent color fastness to washing.
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