A series of new disazo disperse dye compounds based on 4-amino-2-chlorophenylazo-4bromobenzene intermediate were prepared by linking various arylamines and phenolic derivatives to this intermediate through diazo coupling reactions. The structures of the azo compounds were confirmed by FT-IR, 1 H NMR, 13 C NMR and UV-visible spectral data. The results of the UV-vis absorption spectra of some of the dyes showed near-infrared absorptions around 573-800 nm. The results of the colour fastness to washing and sublimation gave an excellent value of grade 5. The light fastness values were found to be technically acceptable with the grey-scale grade of 5 to 6-7. Also, the rubbing fastness was observed to be grade 3/4 to 4.
In an attempt to find more environmentally friendly azo dyes, the synthesis and application of disazo disperse dye derivatives of 4-amino-2-chloro-6,7-dimethoxyquinazoline and 3-chloroaniline on polyester fabric are reported. The disazo dyes were synthesized via diazotisation of 3-chloroaniline and coupled with 4-amino-2-chloro-6,7-dimethoxyquinazoline to afford an intermediate azo dye. This intermediate was further diazotised in concentrated sulphuric acid and followed by coupling reactions with various coupling components such as 1,3-diyhydroxybenzene, 2-amino-6-methylbenzonitrile, 3-amino-5-methyl-prazole, 1-napthol and 7-methoxy-2-naphthol to give the disazo disperse dyes. The basic fastness properties (light fastness wash fastness heat and rubbing fastness) of the dyes on polyester fibre were discussed in terms of their chemical structures. All the synthesized disazo disperse dyes were characterized on the basis of their spectral analyses, IR, 1 H NMR, 13 C NMR and UV-visible spectroscopic data. The light fastness results were observed to be good ratings (5) and very good ratings (5/6). The sublimation test results gave excellent ratings of (5). Also, it was found that the wash fastness property, which is an indicator whether a dye could have affinity for a textile fabric or not, have excellent ratings of 5. From these results, it can be concluded that the best of these disazo dye compounds could be commercially important in the textile industry.
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