DYEING OF POLYESTER, ARAMID AND POLYPROPYLENE FIBERS IN SUPERCRITICAL CO_2

摘要

Polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) fibers as well as difficult-to-dye fibers such as aramid and polypropylene were dyed using supercritical carbon dioxide at pressures between 10 ～ 33 MPa and temperatures between 35 ～150 degrees Celsius. Special co-solvents were employed to promote the dye sorption. The equilibrium sorption of dye increased with pressure or density as well as temperature. Dye-sorption was analyzed with a sorption model. Colors other than the three primary colors were obtained by using various amounts of dye mixtures with different dye ratios. The optimum amount of co-solvent was also investigated. These sorption data will provide a basis for replacing the current dyeing process with the supercritical fluid dyeing process that does not yield any pollution problem but allows us to save a large amount of energy, Furthermore, the sorption model may reduce the required number of experiments considerably, leading to a low initial investment cost for the new dyeing process.