Epoxy resin is used as the main material for insulated packaging of electronic device and motors, it is urgent to improve its thermal conductivity to meet more demanding use requirements. In this research, epoxy resin was modified by filling irregular alumina (i-Al₂O₃), and the effects of irregular i-Al₂O₃ with different volume fraction on the thermal conductivity and other properties of EP were studied. The results show that with the increase of the mass fraction of i-Al₂O₃, the viscosity of the composite mixing system gradually increases, the tensile strength increases at first and then decreases, the thermal stability and thermal conductivity gradually increase. When the volume fraction of i-Al₂O₃ is 45%, the epoxy composite material shows good the overall performance, its thermal conductivity coefficient reaches to 1.44 W/(m·K), which is 585.7% higher than that of pure epoxy resin with the thermal conductivity of 0.21 W/(m·K), at the same time, the volume resistance of the composite remains at the 10¹⁴ Ω·cm quantitative level.

epoxy resin  /  alumina  /  thermal conductivity  /  volume resistance  /  insulated packaging