Evaluation of Dyeing Efficiency of Synthesized Benzimidazole- Derived AZO Dyes on Nylon 6, 6 Fabrics

This study delves into the application of synthesized benzimidazole-derived azo dyes to nylon 6, 6 fabrics and evaluation of their dyeing efficiency. As earlier reported in first series of this research, ten novel azo acid dyes were synthesized from benzimidazole derivatives using H-acid, Gamma acid, J-acid and Tobias acid as the coupling components and both the synthesized intermediates and the dyes were characterised and their properties and structures confirmed using UV-Visible, FT-IR and ¹ H NMR spectroscopic techniques. The dyeing efficiency of the dyes was investigated on nylon 6, 6 fabrics, and the fastness to perspiration, light and washing were assessed. They showed very good percentage exhaustion (64 ‒ 89) % on nylon 6, 6 with bright and dark intense hues of red, blue and purple. The synthesized azo acid dyes showed very good to excellent (4 ‒ 5) fastness to perspiration, fair to very good fastness to light (3 ‒ 6) and also fair to very good fastness to washing (2 ‒ 4).