导热绝缘PA6复合材料的制备及性能研究

Preparation and Properties of Thermal Conductive Insulating PA6 Composites

采用偶联剂对氧化镁粉体进行表面有机化改性,然后将氧化镁、增塑PA6粉及其他助剂混合,经过双螺杆挤出机制备了导热绝缘PA6复合材料。研究了PA6基复合材料的导热性能、绝缘性能和力学性能与氧化镁含量的关系以及不同粒径的氧化镁复配对PA6基复合材料的导热效果的影响。结果表明:氧化镁含量越高,复合材料的导热率越高,当氧化镁含量为60%时,样品仍然可以注塑成型,并且具有良好的导热性能、绝缘性能和力学性能;采用不同粒径的氧化镁复配,总添加量为60%时,导热绝缘PA6基复合材料的导热系数为1.872 W/(m·K)。

MgO powder was surface organic modified by coupling agent, and then thermal conductive insulating PA6 composites were prepared by mixing modified MgO powder, plasticized PA6 powder, and other additives in double screw extruder. The effects of MgO contents on the thermal conductivity, insulat- ing properties, and mechanical properties of PA6 composites were studied, and the effect of compounding MgO particles with different sizes on the thermal conductivity of PA6 composites were studied. The results show that the thermal conductivity of the composite increases with the increase of MgO content. With 60% of MgO, the composites can still be molded, and show good thermal conductivity, insulating properties, and mechanical properties. When compounding MgO particles with different sizes and the MgO content is 60%, the thermal conductivity of the PA6 composite is 1.872W/（m.K）.