▎ 摘　　要

NOVELTY - Preparing graphene heat dissipation composite material comprises (1) taking the forming container and placing the copper flat tube in the forming container, (2) taking carbon fiber bundles, wrapping layer of aluminum foil on the carbon fiber bundles and exposing the exposed end, and entering to the step (3) if the magnetism meets the requirements, (3) preparing graphene suspension, adding graphene oxide and hydrazine to the reactor, dispersing with ultrasonic waves, and obtaining the mixed solution after ultrasonic dispersion, (4) pouring the mixed liquid into the forming container, (5) arranging multi-level orientation and arrangement of carbon fiber bundles in the mixed solution by magnetic arrangement device, (6) subjecting the mixed solution to freeze-drying process to form carbon fiber bundle-graphene thermally conductive material on the surface of the copper flat tube, and (7) taking two copper-based carbon fiber bundles-graphene thermally conductive materials. USE - The composite material is useful in automobile engine heat-dissipating (claimed). ADVANTAGE - The composite material: has highly oriented carbon fiber bundles in the mixed liquid and arranged through multi-stage magnetic attraction arrangement, so that the thermal conductivity is better; integrally forming the copper flat tube and the graphene thermal conductive material, which can greatly reduce the interface thermal resistance between the copper flat tube and the thermal conductive material; adopts the hydrogen bonding force between the polypyridine compound and the carboxy composite, so that the graphene in the mixed solution is more uniformly dispersed; reduces graphene agglomeration; and improves the thermal conductivity of the material. DETAILED DESCRIPTION - Preparing graphene heat dissipation composite material comprises (1) taking the forming container and placing the copper flat tube in the forming container, and placing the forming container in the outer container, (2) taking carbon fiber bundles, wrapping layer of aluminum foil on the carbon fiber bundles and exposing the exposed end, using pulsed laser vapor deposition equipment to deposit cobalt film on the exposed end, detecting the magnetism of the cobalt film deposition end on the carbon fiber bundle, performing the cobalt film deposition operation again if the magnetism is insufficient, and entering to the step (3) if the magnetism meets the requirements, (3) preparing graphene suspension, adding graphene oxide and hydrazine to the reactor, dispersing with ultrasonic waves, heating up to reaction temperature and reacting to obtain graphene precipitate, washing the precipitate, adding water again, performing ultrasonic dispersion to obtain graphene suspension, placing the carbon fiber bundle obtained in the step (2) in the graphene suspension, and obtaining the mixed solution after ultrasonic dispersion, (4) pouring the mixed liquid into the forming container, and placing the outer container on the magnetic suction arrangement device, (5) arranging multi-level orientation and arrangement of carbon fiber bundles in the mixed solution by magnetic arrangement device, and passing the top end of the carbon fiber bundle through the top surface of the mixed liquid after orienting and arranging, (6) subjecting the mixed solution to freeze-drying process to form carbon fiber bundle-graphene thermally conductive material on the surface of the copper flat tube, i.e. copper-based carbon fiber bundle-graphene thermally conductive material, and (7) taking two copper-based carbon fiber bundles-graphene thermally conductive materials, and welding the copper-based exposed ends of the flat copper tubes to obtain final heat dissipation material. An INDEPENDENT CLAIM is also included for graphene heat dissipation composite material for automobile engine prepared by the method.