▎ 摘　　要

NOVELTY - Preparing a multi-dimensional high thermal conductivity graphene composite board comprises e.g. (i) mixing graphene, resin, dispersant and the remaining solvent and dispersing to obtain a uniformly dispersed graphene slurry; (ii) pouring the uniformly dispersed graphene slurry into a mold, scraping and placing it in an oven to obtain a pre-dried graphene composite; (iii) placing the pre-dried graphene composite board in an electrostatic field, and flocking; (iv) drying the pre-dried graphene composite board template skeleton and solidifying; (v) drying the graphene composite board with carbon fiber inserted completely and carbonizing; (vi) soaking the carbonized graphene composite board in the resin solution; (vii) wiping the surface of the impregnated graphene composite board and curing; (viii) carbonizing the dry-impregnated graphene composite board twice; and (ix) graphitizing the secondary carbonized graphene composite board in a graphitization furnace. USE - The method is useful for preparing multi-dimensional high thermal conductivity graphene composite board. ADVANTAGE - The method: can produce board with multi-dimensional good thermal conductivity, preferably in-plane thermal conductivity of above 700 W/m/K, and its vertical thermal conductivity is above 50 W/m/K, density of 1.6-1.8 g/cm3 and a thickness of 300 mu m-3 mm. DETAILED DESCRIPTION - Preparing a multi-dimensional high thermal conductivity graphene composite board comprises (i) mixing 6-8 pts. wt. graphene, 0.5-2 pts. wt. resin, 0.01-0.2 pts. wt. dispersant and the remaining solvent with a speed of 2000-5000 revolutions/minute in high-speed mixer for 1-2 hours, and dispersing ultrasonically for 1-2 hours to obtain a uniformly dispersed graphene slurry; (ii) pouring the uniformly dispersed graphene slurry into a mold, scraping the surface with a scraper, and placing it in an oven at 30-200 degrees C for 2-8 hours to remove 80 wt.% of the solvent to obtain a pre-dried graphene composite; (iii) placing the pre-dried graphene composite board in an electrostatic field, and flocking 25-35 wt.% raw graphene carbon fibers electrostatically to obtain the pre-dried graphene composite board template skeleton with the carbon fibers inserted vertically; (iv) drying the pre-dried graphene composite board template skeleton that has been vertically inserted into the carbon fiber completely and solidifying in a 30-200 degrees C oven for 6-10 hours; (v) drying the graphene composite board with carbon fiber inserted completely and carbonizing in a vacuum hot-press furnace; (vi) soaking the carbonized graphene composite board in the resin solution comprising at least one of monomer, furfurone or furfural for 2-24 hours; (vii) wiping the surface of the impregnated graphene composite board cleanly and placing it in an oven at 30-200 degrees C for curing; (viii) carbonizing the dry-impregnated graphene composite board twice according to the conditions set for carbonization; and (ix) graphitizing the secondary carbonized graphene composite board in a graphitization furnace.