Relationships between the Solubility of C. I. Disperse Red 60 and Uptake on PET in Supercritical CO₂

Abstract

The solubilities of C. I. disperse red 60 in supercritical CO2 at temperatures of 353 K, 373 K, and 393 K and pressures from 11 MPa to 23 MPa were determined. The results showed that within the range of the experiments the solubilities remained at a magnitude of 10-6 mol dye/mol CO2 and were increasing with increasing pressure or density at constant temperature. The equilibrium solubility data were successfully correlated using a semiempirical model. To reveal the relationships between dye solubility and its uptake on the fiber, we carried out dyeings of PET fiber in supercritical CO2 at corresponding pressures and temperatures. The results showed that very high solubility was not beneficial for high dye uptake because the dyeing of PET in SC-CO2 also obeyed the partition rule as in water.

Dyeing of polylactide fibers in supercritical carbon dioxide

“…The dye uptake of the PLA fiber increased as the pressure increased from 8 to 17 MPa, but a decrease was observed when the pressure exceeded 17 MPa. Similar results were also obtained when PET fiber was dyed in SC‐CO 2 with disperse dyes 15…”

Supercritical fluid dyeing of synthetic and natural textiles – a review

“…Density-based correlations were successfully and widely used to correlate the solubility data of dyes in scCO 2 [9,17,20,22,23,29,31,[35][36][37][38]42,43,46,50,55,58,[60][61][62][63][64]67,68,81]. Among the different approaches, the Chrastil model gave the best correlation, as was reported several times in the literature [17,31,38,46,64,81].…”

“…While extensive data on the solubility of dyes in scCO 2 has been published, less information can be found as far as the equilibrium dye uptake in textiles is concerned. The equilibrium uptake of disperse dyes in PET textiles can reach a value of 3–10% w/w and increases both with temperature and pressure (or density) . The experimental range investigated in the literature covers the working conditions generally adopted for supercritical dyeing of PET (60–150 °C, 100–350 bar).…”

Using supercritical carbon dioxide as solvent to replace water in polyethylene terephthalate (PET) fabric dyeing procedures

“…The solubility of disperse dyes in SCD and the influence of supercritical carbon dioxide on crystal growth and morphological changes of dye powder have also been reported (Bao and Dai, 2005;Shinoda and Tamura, 2003;Lin et al, 2001;Hou and Dai, 2009;Bach et al, 2001).…”