Waterless beam dyeing in supercritical CO2: Establishment of a clean and efficient color matching system

Abstract

Utilization supercritical CO2 to conduct the anhydrous dyeing of polymers, as one of the most important candidates instead of water dyeing, has been highly concerned by textile industry due to its environmental friendliness, energy preservation and recyclability of CO2 and chemicals. In order to investigate an efficient color matching database of supercritical CO2 dyeing, polyester dyeing was carried out with Disperse Red 54, Disperse Blue 79 and Disperse Red 167. The basic database of the three disperse dyes in supercritical CO2 was established using the Kubelka-Munk Theory with Single Constant. The results showed that the build-up curves of Disperse Blue 79, Disperse Red 54 and Disperse Red 167 at 610 nm, 480 nm and 520 nm are convex upwardly rather than straight. Large deviation between the calculated K/S data and the experimental ones of the dyed polyester is emerged because the color depth at the maximum absorption wavelength is affected by other dyes in supercritical CO2. By introduction of correction coefficients, less than 6 % deviation values between the calculated K/S values and the experimental ones can be obtained with the revised Kubelka-Munk Theory with Single Constant. The revised equation displays obvious potential application value to reduce the chromatic aberration in the color measurement and matching of supercritical CO2 waterless dyeing.