Color gamut extension of polyester-based materials in supercritical CO2 and its application

In light of the global emphasis on sustainable development, the utilization of environmentally friendly supercritical CO₂ dyeing technology represents a significant avenue for the textile industry to align itself with this trend. Nevertheless, the use of supercritical CO₂ presents a challenge in achieving a complete color gamut of polyester substrates, and there is a dearth of relevant literature. To meet the basic requirements for the number of colors in polyester substrates in supercritical CO₂, we investigated different ratios of Disperse Red 60, Disperse Yellow 54, and Disperse Blue 56 at a total dye concentration of 3 %. The influence of dye ratio on the color parameter values in the color gamut space of polyester knitted shoe materials, polyester zippers, and polyester buttons was analyzed. The study found that in the CIELAB color gamut, the color parameter value of dyed polyester substrate changes with variations in dye proportions. Furthermore, the color displayed by the polyester substrate appears in the red, orange, yellow, green, cyan, blue, and purple regions of the CIE 1931 chromaticity diagram, indicating that the design of the three dye ratios meets the basic requirements of the color and light diversity of the polyester substrate. The K/S value deviation values of knitted shoe materials and zippers remained stable within 0.2, demonstrating excellent dyeing uniformity. The experimental data provide a reference for the color gamut expansion of polyester substrates in supercritical CO₂.