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P. R. Hande,P. P. Badve,R. G. Dugane,S. S. Bhagwat,P. M. Bhate 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Mono-azo dyes possessing a primary aromatic amino group have been shown to react with cotton by diazotizationfollowed by treatment with soda ash at 60-65 °C thereby acting as monofunctional reactive dyes. Bis-azo dyes bearing twoamino groups are expected to act as bi-functional reactive dyes and exhibit enhanced dye-cellulose fixation. This work showsthat the difference in fixation exhibited by mono-azo and bis-azo dyes is statistically significant at 95 % confidence level infavor of the latter group. This work describes a three-bath dyeing process which reduced the amount of consumed water by60.6 % and the environment factor by 62.2 %. The newly developed three-bath process also conserves energy by 74.1 %. Hence, a new class of bifunctional reactive dyes without externally attached reactive systems is, in principle, available. It willhave the advantage of reducing raw materials and manufacturing costs. It also employs a sustainable reactive dyeing process.