阻燃环氧树脂/苯基膦酸铁复合材料燃烧性能研究

以苯基膦酸、硝酸铁为原料,乙醇、乙二醇为溶剂,聚乙烯吡咯烷酮、六亚甲基四胺分别为表面活性剂和配位剂,采用混合溶剂法制备层状化合物苯基膦酸铁(FePP),并将其添加到环氧树脂中(EP)制备复合材料.热重(TG)结果显示,FePP可以提高EP的热稳定性,同时,EP/4FePP的垂直燃烧测试(UL-94)等级达到V-1,氧指...

Study on the synergistic flame retardancy of ferric phenylphosphonate/DOPO in epoxy resin composites

Using phenylphosphonic acid and ferric nitrate as raw materials, ethanol and ethylene glycol as solvents, polyvinylpyrrolidone and hexamethylenetramine as surfactant and coordination agent, the layered compound iron phenylphosphonate (FePP) was prepared by mixed solvent method and then added into epoxy resin (EP). The thermogravimetric (TG) results showed that FePP could improve the thermal stability of EP. At the same time, the UL-94 level of EP/4FePP passed V-1, and the limit oxygen index (LOI) increased accordingly. In order to further improve the flame retardant performance of EP, FePP was mixed with phosphorus containing flame retardant DOPO to flame retardant EP. The test results showed that EP/3DOPO/1FePP nanocomposite can pass UL-94 V-0, and the LOI value was up to 34.5%. The peak heat release rate (PHR) and total heat release rate (THR) decreased by 28.4% and 18.1%, respectively, compared with pure EP. This was mainly because FePP can degrade into oxides containing phosphorus and metal during combustion, which promotes rapid carbonization of polymer. Moreover, DOPO can capture free radicals in gas phase, inhibit the chain reaction, and inhibit combustion. So as to achieve the gas phase and condensation phase co-effect flame retardant effect.