PE-HD复合材料导热性能及力学性能的研究

通过双螺杆挤出机制备了高密度聚乙烯（PE-HD）/石墨/CaCO3增韧母料复合材料，并研究了石墨的表面处理、粒径、含量以及CaCO3增韧母料含量对复合材料导热性能及力学性能的影响。结果表明，偶联剂NDZ201对石墨表面具有较好的处理效果。石墨颗粒直径越小，复合材料的热导率及综合力学性能越高。CaCO3增韧母料能明显提高复合材料的热导率及缺口冲击强度。PE-HD/石墨/增韧母料250B的质量比为45/30/25时，复合材料的热导率可达1.72 W/(m·K)，其缺口冲击强度与纯PE-HD相近，拉伸强度和弯曲强度分别比PE-HD提高了52 %和88 %。

Study on Thermal Conductivity and Mechanical Properties of PE-HD Composites

The composites of PE-HD/graphite/toughening masterbatch were prepared using a twin-screw extruder.The effects of size and content of graphite,and surface treatment on thermal conductivity and mechanical properties of the composites were investigated.It indicated that the graphite was best treated with titanium acid grease NDZ201.The smaller the particle size of graphite,the larger the thermal conductivity and mechanical properties.CaCO3 toughening masterbatch could increase the thermal conductivity and mechanical properties of the composites.When the mass ratio of PE-HD/graphite/250B was 45/30/25,the thermal conductivity of the composite was 1.72 W/(m·K),the impact strength was similar to neat PE-HD,the tensile strength and flexural strength of the composites increased by 52 % and 88 %,respectively.