Dyeing properties of a reactive disperse dye carrying acetoxyethylsulphone group

The dyeing and color fastness characteristics of a reactive disperse dye on Nylon fabric, PET fabric and N/P mixture fabric have been examined. The most appropriate pH for the dyeing of Nylon fabric was 7 and suitable dyeing temperature was 100 °C. The build-up on Nylon fabric was good and various color fastnesses were good to excellent due to the formation of the covalent bond. The reactive disperse dye exhibited the similar dyeing properties on PET fabric to a conventional disperse dye. The rate of dyeing of the reactive disperse dye on Nylon fabric was faster than that on PET fabric when both fabrics were dyed simultaneously in a dye bath, but the difference in the color strength between the two fabrics decreased as the pH decreased. The reactive disperse dye was adequate to the one-step, one-bath dyeing of N/P mixture fabric with good color fastnesses. It was also found by HPLC analysis that the rate of β-elimination reaction of the reactive disperse dye at 100 °C increased 8 times as the pH increased by 1.