▎ 摘　　要

NOVELTY - A graphene-modified EPDM rubber composite material comprises 9-14 %mass EPDM rubber, 1-3 %mass binary ethylene propylene rubber, 205 %mass carbon black, 1-3 %mass nano inorganic thermal conductive filler, 0.05-0.5 %mass graphene, 0.5-1 %mass crosslinking agent, 0.3-0.5 %mass coupling agent, 0.05-0.15 %mass vulcanizing agent, 0.5-1.5 %mass plasticizer, and 0.05-0.2 %mass active agent. USE - Graphene-modified EPDM rubber composite material. ADVANTAGE - The graphene-modified EPDM rubber composite material has excellent thermal conductivity and performance, and improves fatigue resistance of rubber, and is prepared using simple and easy method having strong controllability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the graphene-modified EPDM rubber composite material, which involves preparing graphene nanosheet by grinding coal tar pitch, mixing with additive, adding to a graphite crucible, placing in a high-temperature vacuum sintering furnace, heating to set temperature of 600-1800 degrees C at a rate of 0-30 degrees C/minute, heat preserving for 1-12 hours, cooling the sample naturally along with the furnace, configuring 1-5 mol/L hydrochloric acid, pickling high-temperature product for 1-6 hours, filtering, washing using deionized water to neutrality, placing on surface of dish, and drying in a vacuum drying oven, placing the graphene nanosheet in a ball mill tank, mixing with ball milling solvent pellets chosen from ethanol, N-methylpyrrolidone, dimethylformamide, and sodium lauryl sulfate, milling at 500-1200 rpm for 3-12 hours, separating ball milled material using a 100-mesh standard sieve, filtering and drying to obtain graphene product, graphene by using graphene product as raw material and mixed solution comprising concentrated sulfuric acid, concentrated nitric acid, and potassium permanganate in a mass ratio of 0-3:3-6:0-1, as intercalation agent, in a mass ratio of 1:5-10, adding interaction agent to a reaction vessel, stirring, adding graphene slowly to the reaction vessel within 3-10 hours, dripping hydrogen peroxide to the reaction vessel until mixed solution did not generate bubbles, washing product with water to neutrality, and drying to obtain intercalated graphene, mixing the intercalated graphene with 1-5 mol/L potassium hydroxide solution, stirring in a stirrer at 100-300 rpm for 2-8 hours, ultrasonically treating for 1-3 hours, removing remaining potassium hydroxide solution by filtration, drying the product in a drying oven at 40-100 degrees C for 24-48 hours to obtain mixture, placing the mixture in a high-temperature vacuum furnace, heating to set temperature at a rate of 3-10 degrees C/minute, heat preserving for 1-12 hours, cooling the sample along with the furnace, configuring 1-5 mol/L hydrochloric acid, pickling the sample for 1-6 hours, removing carbides, filtering, washing repeatedly using deionized water until solution is neutral, and drying to obtain activated graphene, preparing rubber by turning on power supply and cooling device, heating the mixer to 90-110 degrees C, adjusting speed to 20-40 rpm, adding rubber raw materials, carbon black, filler, graphene, cross-linking agent, and coupling agent to the mixer, mixing for 4-6 minutes, discharging rubber into a tableting machine, cooling to room temperature, and repeating the above steps for primary mixing, and primary mixing and discharging, adding primary rubber mixture with vulcanizing agent and activator to carry out secondary mixing, maintaining temperature of the internal mixer at less than 90 degrees C, preferably 70-90 degrees C, mixing for 3 minutes or 2-3 minutes, discharging rubber into the tableting machine, leaving still for 8-12 hours, and cooling to room temperature to obtain graphene-modified EPDM composite material with high thermal conductivity. The primary mixing is carried out 1-3 times using an internal mixer at 90-110 degrees C degrees C and 20-40 rpm for 4-6 minutes. The primary mixing and discharging is carried out at 110-150 degrees C. The secondary mixing and discharging temperature is 100-200 degrees C. The composite material is prepared using 7-9 %mass base raw material comprising EPDM rubber, graphene, and/or filler comprising nano oxide, nano carbide, and nano nitride, and 1-3 %mass additive raw material comprising crosslinking agent, silane coupling agent, sulfur, plasticizer, and active agent.