基于磷氮协同阻燃体系的抗静电PBT材料的性能研究

采用聚对苯二甲酸丁二醇酯（PBT）作为基体树脂、二乙基次磷酸铝（AlPi）和三聚氰胺次磷酸盐（MPP）以质量比2∶1的配比作为协效阻燃剂、炭黑（CB）作为抗静电填料，制备了阻燃抗静电PBT材料。通过极限氧指数、UL 94垂直燃烧实验、热重分析和扫描电子显微镜分别研究了PBT复合材料的燃烧性能、热稳定性、抗静电性能并测试了其体积电阻率。结果表明，复合材料的阻燃级别达到UL 94 V-0级，极限氧指数为31 %；CB的阈值为12份（质量份，下同），CB加入量为20份时的体积电阻率达到104 Ω·cm；复配阻燃剂和CB对材料的热稳定性有一定程度的改善，复合材料燃烧后表面形成多孔连续的炭层，获得了优良的阻燃效果。

Study on Antistatic PBT Composite Based on Phosphorus-nitrogen Synergism Flame Retardant System

A antistatic PBT material was prepared by blending it with a compound flame retardant, AlPi and MPP(mass ratio 2∶1), and carbon black. The thermal stability and anti-static properties of the PBT material were studied. It provided a UL 94 V-0 rating，an increased the limited oxygen index value (31 %)，a carbon black percolation threshold of 12 phr and a volume resistivity (104 Ω·cm) when the quantity of carbon (CB) reached 20 phr. TG showed that an improvement in thermal stability was from the flame retardant and carbon black. SEM showed that after continuous combustion a porous carbon surface was formed.