Exploration of N2-CO2 Mix Fluid Supercritical Dyeing Technology for Polyester
Supercritical N2-CO2 mixed fluid was used as the dyeing medium in polyester dyeing process.The dyeing effect of fabrics was analyzed by changing pressure,temperature and the proportion of N2 in the mixed fluid to obtain a better dyeing process,and the color fastness of textiles under this condition was tested.The results indi-cate the optimal process selection is:preserving heat at 120℃for 60 minutes under 23 MPa with 10%N2 adding in the mixed fluid.The color fastness of the obtained product can reach level 4～5,and the dyeing depth and color brightness of the product are good.
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