DOPO和含磷固化剂协同阻燃EP性能

The Properties of Flame Retardant EP Synergized by DOPO and Curing Agent Containing Phosphorus

选用二氯化磷酸苯酯和乙二胺制备了含磷二胺固化剂(BOPA),采用9,10-二氢-9-氧杂-10-磷杂菲-10氧化物(DOPO)与环氧树脂(EP)反应制备了DOPO改性EP,使用傅立叶变换红外光谱(FTIR)表征了单体的结构,并跟踪了BOPA与DOPO改性EP(DOPO-E51)的反应,表明在80℃固化2 h可以完成EP的固化。BOPA和DOPO-E51改性EP固化物的极限氧指数达到29.5%,通过垂直燃烧UL 94 V-0级。热重分析表明,采用DOPO和BOPA阻燃后,EP固化物的初始分解温度下降,残炭率提高;FTIR和扫描电子显微镜分析残炭表明,使用DOPO和BOPA后,残炭中生存更多P=O和P—O—C的结构,从而形成更致密的残炭,提高了阻燃性能。

The curing agent containing phosphorus(BOPA)was prepared by phenyl dichlorophosphate and ethylenediamine,and DOPO-epoxy resin was prepared by epoxy resin(E-51)and(DOPO).The structures of the curing agent containing phosphorus(BOPA)and DOPO-epoxy resin were characterized by Fourier transform infrared spectroscopy(FTIR),the reaction routine of BOPA and DOPO-epoxy resin was tracked by FTIR,and the results show that it cures completely after heated at 80℃for 2 hours.The LOI value of EP with the BOPA and DOPO-epoxy resin is 29.5%,and passes UL 94 V-0 test.TGA result reveales that the EP composite cured with BOPA and DOPO-epoxy resin have lower initial degradation temperature and higher char residue.The char is characterized by FTIR and SEM,the results indicate that the EP composite cures with BOPA and DOPO-epoxy resin formed more P=O and P—O—C bonds during combustion,and more compact char layer is formed to improved flame retardant properties.