›› 2023, Vol. 37 ›› Issue (10): 70-76.

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竹基多孔碳协同二乙基次膦酸铝催化阻燃环氧树脂及作用机理研究

王芳1,郝建薇2   

  1. 1. 北京市丰台区消防救援支队
    2. 北京理工大学材料学院
  • 收稿日期:2023-03-20 修回日期:2023-06-05 出版日期:2023-10-26 发布日期:2023-10-26

Study on flame-retardant epoxy resins and mechanism based on catalysis of bamboo-based porous carbon and aluminum diethylphosphinate

  • Received:2023-03-20 Revised:2023-06-05 Online:2023-10-26 Published:2023-10-26

摘要: 利用可再生资源为协效剂,将竹基多孔碳(PCM)与二乙基次膦酸铝(AlPi)添加于环氧树脂(EP),研究了PCM协同AlPi催化阻燃EP复合材料性能及作用机理。结果表明,PCM(3 %)与AlPi(4.4 %)复合于EP后,复合材料的极限氧指数(LOI)由纯EP的24.6 %提高到42.6 %,UL 94测试达到V-0级,热释放速率峰值降低60.7 %,PCM协同AlPi催化阻燃EP的效果显著。热失重-红外光谱联用、热失重-质谱联用、X射线光电子能谱及拉曼光谱研究揭示,PCM具有催化AlPi在气相释放二乙基次膦酸捕捉自由基,在凝聚相形成氧化铝、磷酸铝和焦磷酸铝,提高炭层的耐热氧化能力及促进类石墨炭层形成的作用。

关键词: 多孔碳, 二乙基次膦酸铝, 环氧树脂, 协同作用, 阻燃机理

Abstract: The flame retardancy and mechanism of bamboo-based porous carbon (PCM) and aluminum diethylphosphonate (AlPi) for epoxy resins (EP) were studied through using renewable resources as synergies. Combustion test results indicated that the flame-retardant EP obtained a significant increase in the LOI value when 3 wt% PCM and 4.4 wt% AlPi was introduced. A V-0 classification was also achieved for the flame-retardant EP, and its peak heat release rate decreased by 60.7 %. This means that there is a remarkable catalytic effect of PCM and AlPi on the flame-retardant EP. TG-FTIR, TG-MS, XPS, and Raman spectra indicated that owing to the catalysis of PCM, the diethyl phosphinic acid released by AlPi could capture free radicals in the gas phase to form alumina, aluminum phosphate, and aluminum pyrophosphate in the condensed phase. This improves the resistant thermal oxidation property of char and promotes the formation of graphite-like char.

Key words: porous carbon material, aluminum diethylphosphinate, epoxy resin, synergic effect, flame retardancy mechanism