多元LDHs/EVA纳米复合材料的制备及性能研究

Preparation of plurality LDHs/EVA nano-composites and its properties

以氯化镁(MgCl2.6H2O)、氯化铝(AlCl3.6H2O)、氯化锌(ZnCl2)、氯化铁(FeCl3.6H2O)和碳酸钠(Na2CO3)为原料,采用共沉淀法制备了二元MgAl-CO3LDHs、三元MgAlZn-CO3LDHs和四元MgAlZnFe-CO3LDHs无机纳米粉体,用聚乙二醇(PEG)对3种LDHs进行原位改性,采用熔融共混法制备了EVA/LDHs纳米复合材料,并对LDHs和纳米复合材料进行了透视电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线衍射(XRD)、热重分析(TG)、力学性能、燃烧性能等测试。结果表明加入LDHs纳米粉体后,虽然对复合材料的力学性能有一定的影响,但对复合材料的阻燃效果有着明显的改善;而且随着LDHs元数的增加,复合材料的阻燃效果得到明显提高;当四元MgAlZnFe-CO3LDHs的添加量为15%时,复合材料即可自熄。

MgA1-CO3 double hydroxide （LDHs）, MgA1Zn-CO3 LDHs and MgA1ZnFe-COa LDHs inorganic nanopowders were prepared by coprecipitation and the three LDHs were in-situ modified with PEG. Nano-composites were prepared along with EVA through melt blending and then were injection molded into samples. The mechanical properties and combustibility of the nano-composites were studied and XRD, TG analyses were carried out, the LDHs was also studied by TEM. The results show that. though the mechanical properties of the composites deteriorated to some degree, the flame resistance of the composites improved remarkably with the addition of LDHs powders. Meanwhile the falme resistance improved with more elements in the LDHs. The composites can self-extinguish when 15% MgA1ZnFe-CO3 LDHs were added.