次磷酸铝阻燃剂的合成及其在PBT中的应用

摘要

通过工业副产物和次磷酸钠经一步反应制备得到次磷酸铝（AlHP）阻燃剂。采用1H-NMR、31P-NMR、FTIR、XRF、XRD以及TGA等技术表征了其产物结构及热降解行为。作为阻燃剂应用于PBT时，质量分数为20%的阻燃剂添加量可使聚对苯二甲酸丁二醇酯（PBT）的极限氧指数（LOI）由16.6%提高至29.2%，复合材料的垂直燃烧测试达到UL94 V-0级别；此外，AlHP的加入可显著降低PBT的热释放速率，促进稳定炭层的形成。%In this study , aluminum hypophosphite (AlHP) flame retardant was synthesized with industrial by-products and sodium hypophosphite through one-step reaction. The structure and thermal behavior of the product were characterized by 1H-NMR ,31P-NMR ,FTIR ,XRF ,XRD and TGA. As aflame retardant being used in PBT ,the limit oxygen index(LOI) of PBT with 20 wt% filler loading improved from 16. 6%to 29. 2%,and the vertical burning test reached UL94 V-0 grade. Moreover,not only the heat release rate(HRR) of PBT decreased obviously with the adding of AlHP ,but also the formation of a stable carbon layer had been promoted.