▎ 摘　　要

NOVELTY - Low-temperature resistant polymer insulating and thermally conductive composite material comprises 13-20 pts. wt. high-density polyethylene, 25-30 pts. wt. micron silicone oil lubricant epoxy resin matrix, 5-10 pts. wt. curing agent, 2-7 pts. wt. polypropylene resin, 2-7 pts. wt. polyimide, 27-30 pts. wt. nano thermal conductive filler, 21-30 pts. wt. thermally conductive filler premix and 6-14 pts. wt. micron-sized thermally conductive filler. USE - Used as low-temperature resistant polymer insulating and thermally conductive composite material. ADVANTAGE - The material: maintains the vertical orientation state until solidified and formed; and realizes the one-step method of large-area molding to build a high thermal conductivity interface material/heat dissipation coating. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the low-temperature resistant polymer insulating and thermally conductive composite material, comprising (i) placing the above-mentioned high-density polyethylene and micron silicone oil lubricant epoxy resin matrix into a high-mixer for pre-mixing to obtain pre-mix, vacuum-drying, dispersing and refining under the high-frequency vibration of ultrasonic waves, where the spherical particles of the polishing slurry resonate according to the vibration of ultrasonic waves until to generate oscillating harmonics, and the grinding will be more thorough after the acceleration and dispersion, (ii) using 750-800 rpm for stirring until the mixture is uniform, filtering with 100 meshes gauze, pouring into a sand mill for cyclic grinding, using ultra-fine grinder and ultrasonically processing the simultaneously during the grinding process, and then filtering with 400 meshes screen, (iii) grinding and stirring while blowing nitrogen to make fully swell for removing the oxygen in the mixed solution and uniformly mixing the components, (iv) adding polypropylene resin, polyimide, nano thermal conductive filler, thermal conductive filler premix, micron-level thermal conductive filler into obtained in the step (iii) to obtain high-efficiency insulation and thermal conductivity with highly dispersed and oriented internal fillers and excellent mechanical properties, (v) using the melt blending extrusion process, single-screw extruder, double-screw extruder or multi-screw extruder, adding melting and blending obtain main feeding port, processing curing agent and high molecular powder, cooling, drying and granulating.