Dyeing properties of modified copolyester fibers

In order to improve the dyeing performance of polyester fibers,ECDP fibers were dyed with cationic dyestuff,and their dyeing properties were studied systematically.The results showed that the isothermal adsorption curve of ECDP fibers was in accordance with L-type(Langmuir-type).The dyeing saturation values of ECDP were higher than those of PET,CDP and PAN fibers.Its dyeing depth was comparable to that of PAN.ECDP fibers showed S type adsorption curve,high dye-uptake rate which could be further enhanced by rising the temperature or extending the holding time.The pH of the dye bath should be controlled at around 4-5.