磷–氮系膨胀型阻燃剂改性玻纤增强聚丙烯

采用双螺杆挤出机共混的方法制备了磷–氮系膨胀型阻燃剂与玻璃纤维改性聚丙烯(PP)的共混物,通过垂直燃烧、扫描电子显微镜表征、力学性能测试、氧化诱导期和热重分析等研究了改性体系的阻燃性能、力学性能和热稳定性等。结果表明,磷–氮系膨胀型阻燃剂SS–111提高了玻纤增强PP的阻燃性能,当阻燃剂添加量超过30%后,垂直燃烧等级达到UL94 V–0级;由于玻纤的增强作用,复合体系随阻燃剂SS–111添加量的增大,除弯曲弹性模量较未添加时有600~700 MPa的提高外,其他力学性能变化不大;阻燃剂还使复合体系的氧化诱导期延长,高温氮气条件下,阻燃剂提前分解形成阻隔层减缓了PP的热分解,体系热稳定性提高。

Phosphorus-Nitrogen Intumescent Flame Retardant Modiifed Glass Fiber Reinforced Polypropylene

The blends of phosphorus -nitrogen intumescent flame retardant and glass fiber modified polypropylene were prepared by methods of blending in twin screw extruder. Flame retardant properties,mechanical properties and thermal stability of the blends were studied through vertical combustion,scanning electron microscopy,mechanical property test,oxidation induction time and TG test. The results showed that phosphorus -nitrogen intumescent flame retardant SS-111 improved flame retardant properties of glass fiber reinforced polypropylene,when the content of flame retardant SS-111 was more than 30％,vertical combustion level reached UL94 V-0. Because of enhancement of glassfiber,the increase of theflame retardant SS-111 amount, in addition to the bending modulus of the blends improved 600-700 MPa than blends without flame retardant SS-111,other mechanical properties changed little. Flame retardant SS-111 also prolonged the oxidation induction time of the blends,and it's decomposition could form barrier layer to slow down the thermal decomposition of the polypropylene under the condition of high temperature nitrogen,thermal stability of the blends were improved.