不同类型氢氧化镁填充EVA复合材料性能研究

Study on the EVA/MH Composite material Properties Containing Different Types of Magnesium Hydroxid

将氢氧化镁填充至EVA中,填充量分别为30%、50%,对合成的MH/EVA复合材料进行力学性能测定,比较不同水热条件对复合材料力学性能的影响;并研究了添加国产普通氢氧化镁、雅宝H-5以及通过实验制备得到的氢氧化镁对复合材料力学性能、热重分析、拉伸断面的影响。结果表明,与另外4种MH相比,160℃水热得到的MH分散性好,表面极性小,与EVA的相容性好,MH/EVA复合材料的初始分解温度高,更不易点燃,当材料承受外力时,界面层能承受较高的外力,表现出一定的韧性断裂,发生断裂时拉伸断面的拔丝现象更明显,具有较好的力学性能。因此,160℃水热合成的MH更适合做阻燃剂填充至EVA中。

The magnesium hydroxide （MH） flame retardants made from ammonia under various hydrothermal conditions were studied by comparing mechanical properties of the EVA compounds containing such MH at 30 and 50% , respectively. Comparisons were made between these experimental MH and other commercial Chinese MH products and an Albemarle MH called H - 5, in such aspects as tensile property, TGA thermogram and cross - section characteristics of fractured tensile bars. The results show that, compared to other four MH ,the MH obtained by 160 ℃ hydrothermal treatment has low surface polarity, best dispersion and best compatibility with EVA. The MH/EVA composite materials are characterized by elevated initial decomposition temperature, thus difficult to be ignited. Such materials show finite resilience, thus able to withstand elevated forces. When fracture occurs, the fractured section of tensile bars show some distinct ＂wire extension＂ ,thus resulting in increased mechanical property. It is concluded that the experimental MH prepare.