有机磷阻燃剂对阻燃增强PET材料的性能影响

Effect of Phosphorous-containing Flame Retardant on Reinforced and Flame Retardant PET

考察了3种有机磷阻燃剂对溴化聚苯乙烯阻燃增强聚对苯二甲酸乙二醇酯(PET)材料性能的影响,筛选出了合适的有机磷阻燃剂,全面考察了其用量对阻燃增强PET体系力学性能、热学性能、结晶性能、相对漏电起痕指数(CTI)和灼热丝起燃温度(GWIT)的影响。结果表明,相比多聚芳基磷酸酯和三聚氰胺聚磷酸盐,使用次膦酸盐作为无卤协同阻燃剂的综合性能最好。随着次膦酸盐用量的增加,阻燃增强聚PET材料的拉伸强度和弯曲强度先增加后降低,缺口冲击强度逐渐下降,热变形温度逐渐升高,阻燃性能和结晶性能变好,CTI和GWIT升高。当次膦酸盐用量为6份时,阻燃增强PET材料的拉伸强度为118.0 MPa,弯曲强度为178.5 MPa,缺口冲击强度为7.3 k J/m2,热变形温度为243.7℃,阻燃等级为UL94 V-0(1.6 mm),冷结晶温度为220.3℃,CTI为300 V,GWIT为900℃。

Three flame retardants including poly-aryl phosphate, melamine pyrophosphate and hypophosphite were compared in the effect on the properties of brominated polystyrene flame retardant reinforced polyethylene terephthalate （PET） materials. So the suitable flame retardant was selected, then the effect of its amount on the mechanical and thermal and crystallization properties and comparative tracking index （CTI） and glow-wire ignition temperature （GWIT） of the PET materials were investigated. The results show that the PET material with hypophosphite as the halogen free flame retardant synergistic agent has the best combination property compared to poly-aryl phosphate and melamine pyrophosphate. When the hypophosphite content increases, the tensile and flexural strength of the PET material increase first and then decrease, the notched impact strength decreases gradually, the heat distortion temperature increases gradually, the flammability and crystallization are improved, and values of CTI and GWIT both raise. When adding 6 phr of hypophosphite, the tensile strength of the PET material was 118.0 MPa, the flexural strength was 178.5 MPa, the notched impact strength was 7.3 kJ/m2 , the heat distortion temperature was 243.7 ℃, the flame retardant rating was UL94 V-0 rating （ 1.6 mm） , the crystal temperature was 220.3 ℃, and CTI was 300 V and GWIT was 900 ℃.