氢氧化镁形貌对环氧树脂阻燃性能的影响

Effect of Magnesium Hydroxide Morphology on Flame Retardancy of Epoxy Resin

材料的形貌对其阻燃性能的影响较大。为研究不同形貌氢氧化镁对环氧树脂阻燃性能的影响,以氯化镁和硫酸镁为原料,制备了棒状、片状和花球状的氢氧化镁,将其添加至环氧树脂中制备环氧树脂复合材料,并探究其阻燃性能和阻燃机理。结果表明:棒状氢氧化镁的直径为250~500 nm,长度约5μm;片状氢氧化镁为六角片状结构,尺寸为100 nm;花球状氢氧化镁大小为1~2μm。当氢氧化镁的添加量为3%时,对环氧树脂阻燃性能的提升效果为:片状>花球状>棒状。相较纯环氧树脂,片状氢氧化镁的加入使复合材料的总烟释放量降低35.1%,热释放速率峰值降低了36.6%,CO释放速率峰值降低了39.4%。研究为氢氧化镁在高分子中的应用提供了方向。

The morphology of the material has a great influence on its flame retardancy.In order to study the effects of magnesium hydroxide with different morphologies on the flame retardancy of epoxy resin,magnesium chloride and magnesium sulfate were used as raw materials to prepare magnesium hydroxide with rod,flake and flower,and were added to epoxy resin to prepare epoxy resin composite to explore the flame retardancy and the flame retardant mechanism.The results show that the diameter of rod magnesium hydroxide ranges from 250 nm to 500 nm and the length is about 5μm.The flaky magnesium hydroxide has a hexagonal sheet structure with a size of 100 nm.The size of flower ball magnesium hydroxide is 1~2μm.When the addition of magnesium hydroxide is 3%,the flame retardancy of epoxy resin is improved as:flake>flower>rod.Compared with pure epoxy resin,the addition of flaky magnesium hydroxide reduceds the TSP by 35.1%,the PHRR by 36.6%,and the PCOP by 39.4%.The research provides the direction for the application of magnesium hydroxide in polymers.