▎ 摘　　要

NOVELTY - Preparing alpha -manganese dioxide-graphene-polytetrafluoroethylene anti-friction wear-resistant composite material, comprises (a) preparing nano alpha -manganese dioxide-graphene composite; (b) preparing acrylic acid graft polytetrafluoroethylene powder; and (iii) providing nano alpha -manganese dioxide-graphene composite material, acrylic acid graft treated polytetrafluoroethylene powder and ethanol in the mass ratio of 5-20:80-95:240; adding absolute ethanol into manganese dioxide nano alpha -graphene composite powder, ultrasonictaing the nano alpha -manganese dioxide-graphene powder in anhydrous ethanol. USE - The method is useful for preparing alpha -manganese dioxide-graphene-polytetrafluoroethylene anti-friction wear-resistant composite material (claimed). DETAILED DESCRIPTION - Preparing alpha -manganese dioxide-graphene-polytetrafluoroethylene anti-friction wear-resistant composite material, comprises (a) preparing nano alpha -manganese dioxide-graphene composite: providing 98% concentrated sulfuric acid, manganese sulfate, potassium permanganate, ultrafine graphite powder, 30% hydrogen peroxide, 50% hydrazine hydrate, 25% aqueous ammonia, N,N-dimethylacetamide, ethylenediamine and graphite powder with particle size of 30 m; where the ratio of concentrated sulfuric acid: manganese sulfate: potassium permanganate: graphite powder: hydrogen peroxide: hydrazine hydrate: ammonia: N,N-dimethylacetamide: ethylenediamine is 80-90:1-2:7-11:2-4:20-30:2-5:6-9:500-800:3-6; preparing graphene powder; dispersing the obtained graphene powder in N,N-dimethylacetamide solution, ultrasonicating the mixture solution for 60-120 minutes at ultrasonic frequency of 40 kHz; adding ethylenediamine, magnetically stirring at 80 degrees C for 12-18 hours; mixing the reaction solution, vacuum filtering the mixed solution, washing with deionized water until neutral and finally drying for 10 hours at 60 degrees C, to obtain amino graphene; adding the manganese sulfate solid powder into deionized water, stirring at room temperature to fully dissolve the solid, adding amino graphene powder mixed solution, ultra-sonicating for 30-60 minutes at 40 kHz, in ultrasonic bath temperature of 20-30 degrees C; adding 14-18% potassium permanganate powder into the ultrasonicated mixed solution, stirring at room temperature so that solid potassium permanganate powder is completely dissolved; transferring the mixed solution into a stainless steel reactor, tightening the stainless steel reactor sealing lid and placing in an electric furnace, controlling EAF hall temperature to 150 degrees C, carrying out hydrothermal reaction after 24 hours, closing the furnace and cooling to room temperature, taking out from the electric furnace stainless steel reactor, opening the stainless steel reactor sealing cap, adding the mixed solution inside the reaction vessel and centrifuging at 4000 rpm for 10 minutes, washing with deionized water until the precipitate is neutral; drying the precipitate in a vacuum oven at 60 degrees C for 12 hours, ultrafine grinding the precipitate into ultra-fine powder to 0.5 mu m nano alpha -manganese dioxide-graphene composite; (b) adopting a HD-1A plasma processing apparatus for plasma treatment of polytetrafluoroethylene powder, placing the pretreated polytetrafluoroethylene powder in the reaction chamber between the two electrodes, connecting the reaction chamber to one end of a vacuum pump, and connecting the other end to the intake system, maintaining the vacuum pump working pressure within the reaction chamber at 5 Pa, purging with argon for 5 minutes, maintaining stable pressure in the reaction chamber pressure, starting the frequency power source, processing for 60 seconds at 40 V, so that C=C bond is formed on the surface, carrying out subsequent polymerization, turning off radio frequency power, closing the intake air passage and vacuum pump, removing polytetrafluoroethylene powder and placing in air for 15-30 min in the air; in a fume hood, adding the polytetrafluoroethylene powder into 10 wt.% aqueous solution of acrylic acid, where the mass ratio of acrylic acid and an aqueous solution of polytetrafluoroethylene powder is 8-9.5:100, purging with nitrogen as a protective gas, magnetically stirring at 70 degrees C to obtain a suspension; stirring the reaction mixture for 24-30 hours, centrifuging the suspension at 4000 rpm for 10 minutes, washing repeatedly with deionized water to remove the acrylic monomer on the surface of the PTFE powder and then placing in an oven and drying at 70 degrees C for 12 hours, to obtain acrylic acid graft polytetrafluoroethylene powder; and (iii) providing nano alpha -manganese dioxide-graphene composite material, acrylic acid graft treated polytetrafluoroethylene powder and ethanol in the mass ratio of 5-20:80-95:240; adding absolute ethanol into manganese dioxide nano alpha - graphene composite powder, ultrasonictaing for 60-90 minutes at 40 kHz, 25-35 degrees C and uniformly dispersing the nano alpha -manganese dioxide-graphene powder in anhydrous ethanol; adding the acrylic-grafted polytetrafluoroethylene powder and manganese dioxide nano alpha - graphene powder into ethanol, magnetically stirring at room temperature for 120-150 minutes to prepare alpha -manganese dioxide-graphene-polytetrafluoroethylene-ethanol mixed solution; drying the obtained mixed solution at 100 degrees C for 24 hours to obtain alpha -manganese dioxide-graphene -polytetrafluoroethylene mixed powder; and molding alpha -manganese dioxide-graphene-polytetrafluoroethylene wear antifriction composite.