Methoxy-Functionalized Monoazo Dyes: Synthesis, Characterization, and Evaluation of Dyeing Performance on Nylon Fabrics
DOI:
https://doi.org/10.56919/usci.2543.020Keywords:
Monoazo dyes, 2-Amino-4,5-Dimethoxybenzoic Acid, SpectroscopicAbstract
Synthesis of new monoazo acid dyes derived from 2-amino-4,5-dimethoxy benzoic acid using H-acid, J-acid, Tobias acid, Gamma acid, and 1-naphthol, and their utilization in dyeing of textile fabric is attempted in this article. The synthesized dyes were purified by recrystallization, and their melting points were between the range of 152-257 oC. The dyes were characterized using UV-Visible, FT-IR, and LC-MS spectroscopic techniques. The suitability of the prepared dyestuffs for dyeing of nylon 6,6 fabrics has been investigated. The UV-Visible spectrophotometric evaluation of the synthesized dyes in different solvents was carried out to determine their absorption maxima and molar extinction coefficients. The dyes showed absorption within the visible region (460-554 nm) and the molar extinction coefficients (ε) ranged from 2.141 × 10⁴ to 3.336 × 10⁴ L·mol⁻¹·cm⁻¹. The dyes were also tested for their dyeing build-up on nylon 6,6 fabrics. The dyes exhibited very good percentage exhaustion (50-93%) on nylon 6, 6 with dark, intense hues of purple and orange. The dyed fabrics demonstrated good to excellent fastness to washing (3-5), very good to excellent fastness to light (4-7), as well as good to excellent fastness to perspiration (3-5).
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