Synthesis And Properties Study Of The Novel Hydrophilic And Flame Retardant Polyester Fiber

Polyethylene terephthalate (PET) fiber is widely used in clothing fabrics and other fields because of its low cost, high strength, good performance of decontamination. It is the most widely used synthetic fiber in current the world and in our country. But 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. It is become important research direction in the field of improvement the handle, perception, hydrophilic, flame retardancy, etc.In this paper, in order to improve the hydrophilicity of polyester fiber and flame retardant properties, melting blend and copolymerization two methods were used to prepare the hydrophilic and flame retardant polyester. Polyester chips were prepared by blending hydrophilic materbatch, flame retardant masterbatch and conventional PET. A new type of hydrophilic and synergistic effect of silicon and phosphorus flame retardant copolyester was prepared by using PTA, EG, PEG, polyols and flame retardant containing P and Si. It will meet demand for comfort and safety in the children, the elder clothing and high-grade home textile. The main research results and conclusions are listed as follows:(1) Polyester chips were prepared by blending hydrophilic masterbatch, flame retardant masterbatch and conventional PET. The thermal property of HFR-PET(hydrophilic flame-retardant PET) was investigated by the Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC).The carbon layers of HFR-PET were characterized by the Scanning Electron Microscopy (SEM). Hydrophilic flame-retardant polyester kept good thermal stability. Contact angle became smaller gradually with content increase of hydrophilic masterbatch. With flame retardant masterbatch content rising, microporous on the surface of the polyester and carbon particles on the surface of carbon layer increased after burning, which means flame retardant performance was improved. As hydrophilic masterbatch increased, microporous and the size of the carbon particles on the surface of the polyester decreased after burning.The carbon particles number on the surface of carbon layer significantly reduced, and the coverage degree was worse and worse, which indicates the flame retardant performance became worse and worse.(2) A new type of hydrophilic and synergistic effect of Silicon and phosphorus flame retardant polyester was prepared by using PTA, EG, PEG, polyols and flame retardant containing P and Si. Polyols containing hydroxyl was added before the first esterification. PEG was added after the first esterification, after the second esterification and before condensation. Flame retardant2-carboxyethyl phenyl phosphinic acid (CEPPA) and hydroxyl-terminated silicone oil was added. The structure and thermal properties were investigated by fourier transform infrared spectrometry(FTIR), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC). Kissinger method and Flynn-Wall-Ozawa method were applied to describe the thermal degradation kinetics of copolyester. The properties of HFR-PET had been estimated with the contact angle and LOI, while the carbon layers were characterized by the Scanning Electron Microscopy (SEM). The result of thermal degradation kinetics of HFR-PET indicated that the thermal degradation activation energy of HFR-PET was higher than that of PET. Contact angle is less than65°, LOI were more than32%.(3) The hydrophilic flame retardant polyester fibers was prepared by melt spinning. The spinning temperature was280℃and the spinning speed was3000m/min. When polyol content was0.5mol%and hydroxyl-terminated silicone oil was0.3wt%, Gthe hydrophilic and flame retardant performance was best. The breaking strength of hydrophilic flame retardant polyester fiber was1.7cN/dtex. It could meet the requirements of weaving. The moisture regain was1.0%. The LOI was34%.