不同粒径的Sb2O3对PBT阻燃性能的影响

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

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.

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 the UL94 would reach level V-0.