高导热系数聚丙烯复合材料的制备及研究  

Study on Polypropylene Composites with High Coefficient of Thermal Conductivity and Its Preparation

作　　者：胡祥[1] 李瑞海[1] 

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065

出　　处：《塑料科技》2012年第12期59-64,共6页Plastics Science and Technology

摘　　要：将氧化镁、氧化铝和石墨分别与聚丙烯熔融共混制备导热复合材料,考察了填料种类、基体黏度和增容改性对复合材料导热系数(λ)的影响。结果表明:增加填料含量能逐渐提高λ,且填料的λ直接决定了复合材料的λ;基体黏度越高,复合材料导热性能提高越显著;对氧化镁和氧化铝进行表面改性同时加入增容剂,可以明显减少填料的团聚,形成更多的有效网链,能有效提高复合材料的导热性能。探究了将氧化镁和氧化铝分别与石墨复配来制备高λ的复合材料,发现少量石墨与无机填料复配可以大幅提高复合材料的λ,当聚丙烯/增容剂/氧化镁/石墨质量比为30/10/50/10时,λ达到1.267 W/(m K),比不添加石墨时提高了50%;而对于氧化铝和石墨的复配体系,λ为0.622 W/(m K),相比于未添加石墨时增加了60%。Polypropylene was melt mixed with magnesium oxide （MgO）, aluminum oxide （Al2O3） and colloidal graphite （CG） to prepare thermally conductive composites, respectively, the effects of the fillers utilized, the matrix viscosity and the compatibilization modification on the coefficient of thermal conductivity （λ） of the resultant composites were explored. The results show that： the λ of the composites increases gradually with the content of fillers, while the λ of the fillers directly affects the t of the composites. There exists a more significant increase in for the composites with a higher viscosity of the matrix. Additionally, a further modification on the surfaces of MgO and Al2O3, accompanied by the compatibilization of the composites, demonstrates a more desirable dispersion of fillers, leading to more effective thermally conductive networks, which substantially improves the t of the composites. Furthermore, MgO and Al2O3 are compounded with CG, respectively, to fabricate composites with high values of λ, and satisfying composites with excellent performance are successfully achieved. The t of the composites reaches to 1.267 W/（moK） when the composites consisted of 30% polypropylene, 10% compatibilizer, 50% MgO and 10% CG, achieving an increment of 50% compared to the composite without filling with CG. As for the case of Al2O3, the t of the composites reaches to 0.622 W/（m.K）, which is 60% higher than that of composite without filling with CG.

关 键 词：聚丙烯 导热塑料 氧化铝 氧化镁 石墨 界面改性 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]