采用低分子量溴化聚苯乙烯(LBPS)与三氧化二锑(Sb₂O₃)按固定比例复配,制备LBPS-Sb₂O₃协同阻燃剂,与玻璃纤维(GF)和聚对苯二甲酸丁二醇酯(PBT)熔融共混制备了阻燃玻纤增强PBT。研究了LBPS-Sb₂O₃阻燃体系对玻纤增强PBT的热稳定性、燃烧性能和机械性能的影响。结果表明:玻纤增强PBT中LBPS-Sb₂O₃质量分数占比为17%、19%和21%时,UL94阻燃级别均达V-0级,质量分数为19%时,极限氧指数达36%以上,阻燃效果较优;拉伸强度呈现先增加后降低的趋势,当LBPS-Sb₂O₃质量分数占比为17%时,拉伸强度增加至53.9MPa,当质量分数由19%增至21%时,拉伸强度显著降低;LBPS-Sb₂O₃的加入,使玻纤增强PBT的初始分解温度略有下降,熔融温度基本保持不变;锥形量热仪燃烧测试表明,LBPS-Sb₂O₃的加入有效地降低了玻纤增强PBT的燃烧熄灭时间、有效燃烧热、总热释放量、热释放速率峰值和平均CO₂产量,但总烟气释放量和平均CO产量增加。

By compounding low molecular weight brominated polystyrene (LBPS) with antimony trioxide (Sb₂O₃) in a fixed ratio,a LBPS-Sb₂O₃ synergistic flame retardant agent was prepared,and the LBPS-Sb₂O₃ was incorporated into glass fiber(GF)reinforced polybutylene terephthalate (PBT) by melt blending to obtain flame retardant GF reinforced PBT.The effects of LBPS-Sb₂O₃ flame retardant system on the thermal stability,flame retardancy and mechanical properties of the GF reinforced PBT.According to the research results,the flame retardant UL94 grade reached V-0 level when the LBPS-Sb₂O₃ content in GB reinforced PBT was 17%,19% and 21%;the limited oxygen index reached above 36% when the LBPS-Sb₂O₃ content was 19%,indicating excellent flame retardancy.Its tensile strength first increased and then decreased,when the LBPS-Sb₂O₃ content was 17%,the tensile strength increased to 53.9MPa,and when the content increased from 19% to 21%,the tensile strength decreased significantly.With the addition of LBPS-Sb₂O₃,the initial decomposition temperature of GF reinforced PBT decreased slightly,while the melting temperature remained unchanged.The conical calorimeter combustion test showed that the addition of LBPS-Sb₂O₃ effectively reduced the burn-out time,effective heat of combustion,total heat release,peak heat release rate and average CO₂ yield of flame retardant PBT,but the total smoke release and average CO yield increased.