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Investigation of Eco-friendly Dyeing of Para-aramid Using Supercritical CO2
Yue Zhang,Huanda Zheng,Laijiu Zheng,Tao Cai,Fuer Zheng 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
In order to solve the problems of dyeing difficulty and serious pollution of traditional water-based dyeing of paraaramid,supercritical CO2 fluid was employed as a dyeing solvent to dye para-aramid yarn (temperatures 80-120 ℃, pressures16-24 MPa, dyeing time 15-90 min, and dye concentration 1 %-7 % o.m.f.). The K/S values reached 2.07 and 1.91 at 120 ℃,24 MPa, 60 min, 5 % o.m.f., and a CO2 flow of 20 g/min with C. I. Disperse Red 54 and C. I. Disperse Blue 79, respectively. The results proved that para-aramid yarn could be dyed in supercritical CO2 fluid. Moreover, the thermal and mechanicalproperties of dyed para-aramid yarns in supercritical CO2 showed a slightly increasing trend. The washing, rubbing, and thelight color fastness of the dyed samples were rated above 4-5, and the color fastness durability of the dyed para-aramid wasalso presented good.