不同粒径的Sb2O3对PBT阻燃性能的影响

为了改善聚对苯二甲酸丁二醇酯(PBT)的阻燃性能,采用先机械球磨共混、后熔融注塑的方法制备了Sb₂O₃/BPS-PBT复合材料.研究了Sb₂O₃粒径对复合材料阻燃性能的影响,并分析了复合材料的阻燃机理.结果表明:Sb₂O₃使PBT初始分解温度提前,热分解速率减慢;添加相同质量分数的Sb₂O₃,纳米Sb₂O₃在气相阻燃中的效率和促进残炭形成的催化作用均优于微米Sb₂O₃;当溴化聚苯乙烯(BPS)和纳米Sb₂O₃的质量分数分别为10%和5%时,复合材料的LOI为28.3%,UL94达到V-0级.

Effect of Sb2O3 with different particle sizes on flame-retardancy of PBT

In order to improve the flame retardant performance of polybutylenes terephthalate (PBT), an Sb₂O₃/BPS-PBT composite was prepared by means of mechanical ball milling first and then melting injection molding method. The effect of Sb₂O₃ particle size on flame retardancy of PBT-matrix composite was studied and the flame retardant mechanism of the PBT-matrix composite was analyzed. The result showed that Sb₂O₃ would make the initial decomposition temperature of PBT advanced and the thermal decomposition rate slowed down; Adding Sb₂O₃ with the same mass fraction, the efficiency of nano-Sb₂O₃ in the case of gas-phase flame retardance and the catalytic effect of promoting carbon residue formation would be superior to micro-Sb₂O₃; When the mass fraction of bromide of polystyrene (BPS) and nano-Sb₂O₃ were 10% and 5%, respectively, the LOI of the composite would be 28.3% and theUL94 would reach level V-0.