PP/TPU/DiDOPO阻燃复合材料的制备及性能

Preparation and Properties of PP/TPU/DiDOPO Flame Retardant Composites

使用一种桥链9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DiDOPO)的磷杂菲类作为阻燃剂,并用DiDOPO添加到聚丙烯(PP)与热塑性聚氨脂(TPU)的材料中采用熔融共混法制成PP/TPU/DiDOPO阻燃复合材料。通过借助热重分析(TGA)、差热分析(DSC)、力学测试及燃烧性能测试等表征手段,研究在不同配比下,DiDOPO对复合材料相关性能的影响。结果表明,20%的DiDOPO对PP体系的阻燃性能有明显的改善作用,可以使极限氧指数(LOI)提高到23. 8%,试样垂直燃烧(UL94)等级达到V-1级;力学测试结果表明,适量的DiDOPO可以使复合材料的弯曲强度从29. 56 MPa增加到32. 05 MPa;此外复合材料的结晶性能也有一定提高。

A kind of phosphaphenanthrene with bridged chain 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DiDOPO)was used as flame retardant,and DiDOPO was added into polypropylene(PP) and thermoplastic polyurethane(TPU) materials to prepare PP/TPU/DiDOPO flame retardant composite material by melt blending method.The influence of different ratios on the relevant properties of composites materials were studied by thermogravimetric analysis(TGA),differential thermal analysis(DSC),mechanical testing and combustion performance testing.The results show that 20%of DiDOPO has a significant improvement on the flame retardant performance of the PP system,which can increase the limiting oxygen index(LOI) to 23.8%,and the vertical combustion(UL94)rating of the sample reaches V-1.The mechanical test results show that the proper amount of DiDOPO can increase the bending strength of the composite material from 29.56 MPa to 32.05 MPa.In addition,the crystallization performance of the composite material has also been improved.