▎ 摘　　要

NOVELTY - High heat-conducting and high strength nano-composite material comprises 0.1-1 wt.% polydopamine modified graphene composite material and 99-99.9 wt.% high-density polyethylene as raw material components. The nano-composite material is prepared by performing polymerization of raw material components, blending, discharging, secondary blending and wire drawing. USE - The nano-composite material is useful in heat dissipation fields including automobiles, computers, and LEDs. ADVANTAGE - The nano-composite material has excellent thermal conductivity and mechanical properties. The preparation method: enables the low-filler polydopamine-modified graphene to be uniformly dispersed in the matrix to reduce the interface thermal resistance, and has low overall cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the high heat-conducting and high strength nano-composite material, comprising (i) adding 32 wt.% dopamine monomer into graphene to perform in-situ self-polymerization of dopamine to prepare polydopamine-modified graphene, (ii) adding 0.1-1 wt.% polydopamine modified graphene into high-density polyethylene, melt blending in a torque rheometer at 160-180 degrees C, and banburying and mixing for 4 hours, and discharging to obtain high heat-conducting and high strength polydopamine modified graphene/high-density polyethylene blend, and (iii) pulverizing the high heat-conducting and high strength polydopamine modified graphene/high density polyethylene blend by secondary blending-drawing process, blending and drawing filler and the matrix for second time, more uniformly dispersing the polydopamine-modified graphene in the collective through the hydrogen bond with the surface functional groups to prepare low-filler polydopamine-modified graphene/high-density polyethylene composite material, i.e. nanocomposite material with high thermal conductivity and high strength.