采用磷酸酯（PX-220）作为阻燃剂，聚四氟乙烯（PTFE）、硼酸锌（ZB）作为阻燃协同剂，聚碳酸酯（PC）和聚对苯二甲酸丁二醇酯（PBT）为基体，通过熔融挤出混合，获得阻燃PC／PBT合金。研究了磷酸酯／PTFE和磷酸酯／ZB复合阻燃列对PC／PBT、合金阻燃性能、热分解行为的影响，分析了磷酸酯、PTFE和ZB在阻燃PC／PBT合金中的阻燃机理．采用扫描电镜（SEM）观察阻燃PC／PBT合金的燃烧物表面形态。研究结果表明，磷酸酯／PTFE和磷酸酯／ZB复合阻燃剂盘PC/PBF合金中具有优良的阻燃协同作用，使该阻燃材料的氧指数达到30以上；垂直燃烧达到V-0级。TG曲线扎明，磷酸酯的加入提高了PC／PBT舍金的热分解温度，延缓了PC／PBT合金燃烧速度。合金材料燃烧炭层形税扫描电镜（SEM）说明，复合阻燃剂能增加炭层密度，提高阻燃效果。
The flame-retardant polycarbonate (PC)/polybutylene terephthalate (PBT) alloy were prepared through melting and extruding method using phosphate (PX-220) as flame retardant, polytetrafluoroethylene (PTFE) and zinc borate(ZB) as cooperating flame retardant, PCand PBT as the matrix. The influence of composite flame-retardant phosphate/ZB and phosphate/PTFE on flame-retardant property and thermal decomposition of flame- retardant PC/PBT alloy were studied, The combustible surface feature of flame-retardant PC/PBT alloy was observed by scanning electron microscope (SEM). The results show that composite flame retardant phosphate/PTFE and phosphate / ZB have the excellent flame-retardant cooperating effect, the oxygen index of PC/PBT alloy exceeds 30% and perpendicular burning property achieves V-0 level. TG curves indicate that the thermal decomposition temperature of PC/PBT alloy increases and burning velocity of PC/PBT alloy is delayed after the addition of phosphate. The thickness of the char layer complex increases with the addition of the composite flame retardant.
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