F-ZrP@Co-MOF协效膨胀阻燃聚丙烯性能研究

Study on performance of F-ZrP@Co-MOF synergistic intumescent flame retardant polypropylene

为提高聚丙烯(PP)热稳定性,改善膨胀阻燃剂(IFR)对其力学性能不利影响,利用六氯环三磷腈、三聚氰胺甲醛树脂对磷酸锆-金属有机骨架杂化材料(ZrP@Co-MOF)表面修饰,制备新型纳米阻燃剂F-ZrP@Co-MOF,与聚磷酸铵、双季戊四醇构成IFR/F-ZrP@Co-MOF膨胀阻燃体系。在IFR/F-ZrP@Co-MOF添加质量分数为25%时,考察F-ZrP@Co-MOF对PP燃烧及力学性能等影响。结果表明:未添加F-ZrP@Co-MOF时PP/IFR极限氧指数(LOI)为29.6%,添加量为3.0%时LOI提高了6.08%;添加质量分数为1.0%时800℃的残炭量提高了180.1%;添加量为2.0%时弹性模量为57.21 MPa,比未添加提高了8.3%。拉曼光谱和烟密度测试结果表明添加F-ZrP@Co-MOF炭层更加致密稳定,有利于抑制热量和烟气的传递。

In order to improve thermal stability of PP and reduce negative effects of IFR on PP's mechanical properties,hexachlorocyclotriphosphazene and melamine formaldehyde resin were used to modify zirconium phosphate-metal organic framework hybrid materials(ZrP@Co-MOF)and to prepare a novel nano flame retardant F-ZrP@Co-MOF which,combined with ammonium polyphosphate and dipentaery-thritol,synthesized IFR/F-ZrP@Co-MOF flame retardant.Then,effects of F-ZrP@Co-MOF on combustion and mechanical properties of PP composites were analyzed with 25%mass-ratio addition of IFR/F-ZrP@Co-MOF.The results show that without addition of F-ZrP@Co-MOF,limiting oxygen index(LOI)of PP/IFR is 29.6%while with 3.0%addition of it,LOI value will be improved by 6.08%.With 1.0%addition,residual carbon contents at 800℃is increased by 180.1%compared with no addition at all,and with 2.0%addition,elastic modulus will be 57.21MPa,8.3%higher.The Raman spectrum and smoke density tests further prove that addition of F-ZrP@Co-MOF makes carbon layer more compact and stable,which is beneficial to restraining heat and smoke transfer.