研究了聚磷酸铵（APP）以及APP两种微胶囊,即环氧树脂包覆的APP（EPAPP）和密胺甲醛树脂包覆的APP（MFAPP）在环氧树脂（EP）中阻燃性能、力学性能以及阻燃剂与EP之间的相容性。结果表明,APP在EP中具有较好阻燃效果。与未包覆的APP相比,环氧树脂和密胺甲醛树脂包覆APP（EPAPP和MFAPP）在环氧树脂（EP）中氧指数和垂直燃烧级别基本不变;但添加APP微胶囊的阻燃EP体系的力学性能都有所改善,尤其是冲击强度有较大幅度提高。表面电阻的实验发现,在EP体系中添加APP或APP微胶囊对体系绝缘性能基本上没有影响。
Flame retardant and mechanical properties of epoxy resin（EP） composites were studied containing ammonium polyphosphate（APP） and APP microcapsules with a shell of epoxy resin（EPAPP） and melamine-formaldehyde resin（MFAPP）.The results indicate that APP exerts its good flame retardancy in EP at 7% loading,with the limiting oxygen index（LOI） of 28.8% and a UL 94 rating of V-0.The microencapsulation of APP with about 10% EP and MF resin does not decrease the flame retardant properties of APP microcapsules in EP.It is found that the mechanical properties of the EP composites containing EPAPP or MFAPP are greatly improved compared with APP,especially the impact strengths of the EP composites with EPAPP and MFAPP,100% and 150% higher than that of the EP composite containing APP,respectively.Moreover,the addition of APP and APP microcapsules into the EP resin does not affect the insulation of the composites.
参考文献
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