一种有机金属化合物与磷-氮阻燃剂在环氧树脂中的协同效应与阻燃机理

Synergistic Effect between an Organometallic Compound and Phosphorus-nitrogen Flame Retardants and Flame Retardant Mechanism of Epoxy Resins

将一种有机金属化合物植酸镍(PA-Ni)与聚磷酸铵(APP)、六苯氧基环三磷腈(HPCTP)复配并应用于改性环氧树脂。对改性后的环氧树脂的阻燃性能进行了研究。在添加10%APP,5%HPCTP和5%PA-Ni时,改性环氧树脂的极限氧指数达到34.2%;并能通过垂直燃烧UL94 V-0级。这些结果表明APP/HPCTP/PA-Ni三元复配体系具有高效的阻燃性能。热重分析结果表明三元复配体系的引入能够提升环氧树脂在高温氮气气氛下的热稳定性。使用扫描电子显微镜(SEM)、红外光谱(FTIR)和X射线光电子能谱(XPS)对改性环氧树脂的残炭进行研究,以探索其阻燃机理。PA-Ni可以与APP、HPCTP产生协同作用,增强其成炭的能力。上述结果表明PA-Ni是一种有效的环氧树脂阻燃协效剂。

An organometallic compound nickel phytate(PA-Ni)was used as synergist with ammonium polyphosphate(APP)and hexaphenoxycyclotriphosphazene(HPCTP)to enhance flame retardant property of epoxy resin.The flame retardance of modified thermosets were evaluated.The limiting oxygen index(LOI)value of modified epoxy resins(EP)thermosets is enhanced to 34.2%with 10%of APP,5%HPCTP and 5%PA-Ni incorporated.The modified EP thermosets could pass UL94 V-0 rating.These results suggest that high flame-retardant efficiency is achieved.The thermogravimetric analysis(TGA)results show that the incorporation of APP/HPCTP/PA-Ni into epoxy resins improves the thermal stability at high temperature in Natmosphere.The flame-retardant mechanism of modified thermosets has been investigated by scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)from char residues.PA-Ni shows synergistic action with APP and HPCTP,which enhances the char-forming ability of the flame retardants.The results of all the aforementioned studies distinctly confirms that PA-Ni is an effective flame retardant synergist for epoxy resin.