在环氧树脂(EP)中添加氢氧化镁和氧化铝两种阻燃剂，研究了不同的阻燃剂对EP的阻燃性的影响。结果表明，当氢氧化镁的体积分数为15%时，EP复合材料的极限氧指数为35%，已达到极难燃塑料要求。当氢氧化镁的体积分数为15%时，EP复合材料的燃烧等级已达到UL 94 V–1级。当氢氧化镁和氧化铝添加的体积分数相同时，添加氢氧化镁的EP复合材料的LOI明显高于添加氧化铝的EP复合材料。纯EP的质量保持率为20%，加入氧化铝的EP复合材料的质量保持率为30%左右，加入氢氧化镁的EP复合材料的质量保持率为40%左右，氢氧化镁使EP的阻燃性能得到很大改善。%Alumina and magnesium hydroxide were added in epoxy resin. The effects of different flame retardant adding to epoxy resin (EP) were studied. The results show that when the volume fraction of magnesium hydroxide is 15%, the limitedoxygen index (LOI) of EP composites is 35% and EP composites combustion level is already UL 94 V–1,that reaches the requirements of high fire resistant plastic. When the volume fraction of magnesium hydroxide and alumina in epoxy resin is same,the LOI of magnesium hydroxide epoxy composites is significantly higher than that of alumina composite. The weight maintenance rate of pure epoxy,alumina composite and magnesium hydroxide epoxy composites respectively is 20%, 30%, 40%. The retardant performance of magnesium hydroxide epoxy composites is greatly improved.
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