Study on the effect of different dyeing systems on the interaction of multi‐component reactive dyes by Raman spectroscopy

Abstract

AbstractThe interaction of dye molecules in different adsorption systems is diverse, which affects the adsorption process. In this work, the real‐time adsorption process of CI Reactive Red 195 (RR195), CI Reactive Yellow 145 (RY145), and CI Reactive Blue 194 (RB194) in the actual dyeing process have been studied on cotton fabric by Raman spectroscopy. Three single, three binary, and one ternary system have been investigated at different temperatures (40, 50, 60, and 80°C). The equilibrium dye‐uptake of RR195 and RY145 on cotton fabric decreased with the addition of other components, while that of RB194 remained unchanged. The temperature has little effect on the dyeing of cotton fabric with the RR195/RY145 system. The RR195/RB194 system is more suitable for high‐temperature dyeing. RY145 is less affected by temperature below 60°C while dyeing at 80°C is greatly affected by temperature in the four systems. RB194 with a higher substantivity to the cotton fibre is less affected by temperature in the four systems. The batch adsorption rate data for the seven systems have been analysed based on pseudo‐second‐order kinetics. The results showed that the increase in temperature can accelerate the dyeing rate and time for dye adsorption to reach equilibrium. Activation parameters revealed the potential barrier that dyes need to overcome when dyeing cotton fabrics in different systems. In the actual combination dyeing process, the analysis of each component process can optimise the dye formulation and improve the dye utilisation.