Dyeing Effects Of Bifunctional Reactive Dyes On Knitted Cotton Fabrics

Introduction: Several new bifunctional reactive dyes of the Sumifix Supra range that carry monochlorotriazine and sulphato ethyl sulphone reactive systems were developed and their dyeing performance studied. Suitable characteristic properties and fastness properties were examined over the knitted cotton fabrics. The dyes were characterized by spectral data and elemental analysis. The dyes structures were established by preparing the coupling component using H-acid, cyanuric chloride and 2methoxy-5-methyl (sulphato ethyl) SUIphonyl aniline which was readily coupled with various diazotized 2-amino benzo-thiazole (Figure 1). The results indicated good solubility, a high degree of exhaustion and fixation, excellent fastness degree and higher substantivity over the knitted cotton fabrics. While cotton fabric is an essential element in today's world, reactive dyes are needed to complete ready to wear clothing requirements. With the introduction of the three Procion dyes by ICI for cellulosic fabric in 1956, the covalent bonding of cellulosic fiber to the reactive systems proved to be noteworthy. Further research on cotton goods resulted in the eventual introduction of a newly variable reactive system in reactive dyes.' The term heterobifunctional dyes became widespread after the 1980's through the involvement of four dyes containing monochloro-triazine masked vinyl sulphone (VS/MCT) by Sumitomo,2 which was later called Sumifix Supra dyes. In 1959, I.C.I3 and, in 1961, Hoechst and a few other manufacturers claimed the development of two different reactive groups, by introducing several dyes, yet none were commercialized except one by Hoechst By M.M. Dalal, K.R. Desai, Dept. of Chemistry, South Guiarat Univ., Surat, India