The Synthesis, Characterization and Application of Reactive Dyes Based On 4,4’-Methylene Bis-5-Nitro-O-Toluidine On Silk, Wool and Cotton Fibres
Keywords:
4,4’-methylene bis-5-nitro-o-toluidine, bis azo reactive dyes, cyanuric chloride, 4-chloro aniline, Dyeing, Silk, Wool and CottonAbstract
Ten hot-brand bisazo reactive dyes were synthesized via coupling of tetrazotised 4,4’-methylene bis-5-nitro-o-toluidine with a series of cyanurated coupling components. The structures and purity of the dyes were confirmed by thin-layer chromatography, infrared spectroscopy, and proton magnetic resonance spectroscopy. Dyeing performance was assessed on silk, wool, and cotton, with percentage dye bath exhaustion values indicating good uptake across all fibres. The dyed materials exhibited moderate to very good fastness to light, washing, and rubbing, demonstrating the potential of these bisazo reactive dyes for application in natural fibre coloration.
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