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In light of the global emphasis on sustainable development, the utilization of environmentally friendly supercritical CO2dyeing technology represents a significant avenue for the textile industry to align itself with this trend. Nevertheless, the use of supercritical CO2presents 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.

Large degree of orientation, crystallinity, and high glass transition temperature of aramid make the fibers exhibit ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight and other excellent properties. However, the resulting poor dyeability and water pollution problems of aramid greatly limits its application in protective areas. An eco-friendly supercritical CO2assisted printing strategy for meta-aramid was developed firstly in this study. The effects of treatment temperature, time, pressure and dye concentration on the printing properties were investigated. The obtained results showed that the K/S values of the printed meta-aramid increased with the enhancing of CO2temperature, treatment time and CO2pressure. Compared to tradition printing, higher color depth can be obtained by supercritical CO2assisted printing with 40% sodium carboxymethyl cellulose and 20% guar gum as original paste. The K/S values of the meta-aramid with Cationic Pink X-FG in supercritical CO2was 12.18 while that of the samples with Cationic Yellow 5GL was 5.42. Washing and rubbing colorfastness rated above 4 were reached at 180 °C for Cationic Pink X-FG and at 160 °C for Cationic Yellow 5GL in supercritical CO2. In addition, up to 99% outline sharpness and acceptable stiffness, air permeability and mechanical properties was obtained, which demonstrated that the meta-aramid fabrics with supercritical assisted printing could better meet the wearability requirements.

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