Preparation and Thermal Conductivity of Alumina/Graphene/Waterborne Polyurethane Composite

In this paper, a series of alumina/waterborne polyurethane composites was prepared, and the effects of different amounts of alumina on the thermal conductivity and insulation properties of the composites were studied. In addition, alumina/graphene/waterborne polyurethane composites were prepared by co-doping graphene and alumina into waterborne polyurethane to improve the heat conduction path. The synergistic effect between different fillers formed a denser heat conduction network. The added amount of alumina is 60 wt%. When the amount of graphene added is 2 wt%, the thermal conductivity of the composite can reach 1.049 W/(m·K), which is twice that of the alumina-filled composite, which is obviously better than that of the single-filler filling. Compared with the system only adding alumina, it seeks to improve thermal conductivity while maintaining good insulation. The results show that it is an effective way to improve the thermal conductivity and insulation properties of materials when different fillers are compounded.