The Study On The Copolymerization Modification Of Halogen-Free Flame Retardant Cationic Dyeable Copolyester

Poly(ethylene terephthalate)(PET) has a lot of excellent performance such as the high modulus, high strength, acid-proof and heat resistance. So it is widely used in lots of field such as chemical fiber and plastic. It is very important to study the flame retardant performance of PET, and this is significant not only for theory but also for the practice. In this paper, copolymerization was combined with the nanotechnology to coordinate the high efficiency with blocking effects of nano-particles of phosphorus flame retardant, and then got the halogen-free flame retardant cationic-dyeable copolyester. Meanwhile, the in situ synthesis and hydrolysis method was used to improve the melt drop performance in flame-retardant effect of PET.[Poly-(ethylene terephthalate-co-sodium-5-sulfo-iso-phthalate)](HCDP), sodium ethylene glycol isophthalate5sulfonate (SIPE) was used as the third monomer in this study, which is prepared by the copolymerization method.2-carboxyethyl phenyl phosphinicacid fire retardant cationic dyeable copolyester (CEPPA-HCDP) and hydroxymethyl phenyl phosphinic acid fire reardant cationic dyeable copolyester (HMPPA-HCDP) were synthesized, with the flame retardant of CEPPA and HMPPA, SIPE used the third monoer based on the preparation of the HCDP. While nano-montmorillonite synergistic halogen-free fire retardant cationic dyeable copolyester(CEPPA-HCDP-MMT or HMPPA-HCDP-MMT) were prepared by surface modified nano-montmorillonite synergistic CEPPA or HMPPA. What is more, the nano titanium dioxide synergistic CEPPA or HMPPA fire retardant cationic dyeable copolyester(CEPPA-HCDP-TiO2or HMPPA-HCDP-TiO2) are prepared by titanium dioxide. The titanium dioxide was produced by hydrolysis the catalyst, n-butyl titanate. In the end, a kind of new inorganic nano-particles flame retardant, bioemite(ALOOH), coordinating with titanium dioxide, was used to prepared the bioemite fire retardant cationic dyeable copolyester(ALOOH-HCDP) nano-TiO2synergistis bioemite fire retardant cationic dyeable copolyester(ALOOH-HCDP-TiO2), making the norganic nano-particlesdispersed in the mattrix well-proportioned.First, the synthesis mechanism of three flame retardant copolyester were discussed. Then, the intrinsic viscosity, infrared analysis(FTIR), scanning electron microscopy (SEM), pyrolysis chromatography-mass spectrometry(Py-GC-MS), thermal gravimetric analysis(TG), oxygen index test(LOI), vertical burning test (UL-94) were used to study the properties of the polyester and flame retardant mechanism. The result show that the flame retardancy of HCDP get improved by adding the phosphorus and inorganic flame retardants,. The additionof clay and titanium dioxide will greatly improve the copolyester melt dripping during combustion. By comparing the three kinds of combustion properties of flame-retardant polyester, the research show that HMPPA-HCDP-TiO2has superior flame resistance and anti-drop effect. For phosphorus-containing copolyester, the main flame retarded mechanism is caused by the protective char layer in the condensed phase. For the inorganic flame retardant copolyester, the main flame retarded mechanism is the endothermic effect. Synchronously, the inorganic nanoparticles attaches to the HCDP substrate, which also play a role in the condensed phase flame-retardant.