Abstract: The application of Polyester fiber is restricted because of its disadvantages, mainly the low moisture regain，short of chromaticity, easy accumulation of electrostatic charge, easy pilling and easy burning. In order to improve the hydrophilicity of polyester fiber and flame retardant properties, highly hydrophilic polyester chips were prepared by using PTA,EG, the third monomer（SIPE）,the fourth monomer (PEG) and the fifth monomer（hydrophilc agent）. Flame-retardant and high hydrophilic polyester fibers were prepared by polymerization of hydrophilic sliced and flame retardant masterbatch. Its flame retardant properties and hydrophilic properties were tested. The analysis results show that contact angle were less than 65°and limit oxygen index were greater than 30%. The hydrophilicity, thermal stability and flame retardant performance of hydrophilic polyester were good.

Key words: polyester fiber, polymerization, spinning, hydrophilicity, flame retardancy