Abstract:

Since graphene was discovered, the application of graphene in the field of lubricants had been paid much attention originating from its excellent self-lubrication, mechanical and thermal properties. However, graphene had poor dispersion and easily reunited in oil, which is the key factor limiting the use of graphene in lubricants. To obtain the graphene lubricant additive (MGLOA) with excellent lubrication performance and stable dispersibility, long chain alkanes were grafted on the surfaces of graphene and the oleophilic modified graphene microchip (MGM) was obtained. Otherwise, the formula of lubricant additives (LOA) had been improved to strengthen the interaction between MGM and LOA, which was conducive to further promote the stable dispersion of MGM and showed synergistic lubrication with MGM. The results indicated that the use of MGM and/or LOA can fantastic increase the extreme-pressure lubrication performance of commercial lubricating oils and the optimal amount of MGM and LOA in other lubricants was 0.004 %(mass) and 5%(mass), respectively. The pressure lubrication performances of lubricating oils with 5%(mass) MGLOA-800 (MGM has a content of 0.08 %(mass) in LOA) were improved more than 11 times process. And in application, the process shows good cooling, noise reduction and vibration reduction.

Key words: graphene, surface modification, preparation, extreme-pressure lubrication, stability, attrition

摘要：

石墨烯是一种具有优异自润滑、力学和热学等特性的新型材料，虽然在润滑油领域具有很好的应用前景，但因其在润滑油中的分散性较差、容易团聚而限制了它的广泛应用。通过在石墨烯表面接枝长链烷烃得到了亲油型改性石墨烯(MGM)，且改进了润滑油添加剂(LOA)的配方以加强润滑油和石墨烯的相互作用、促进石墨烯的稳定分散并协同石墨烯发挥润滑作用，最终得到了具有极佳助润滑性能和稳定分散性的石墨烯润滑油添加剂(MGLOA)。结果表明，MGM和LOA在其它市售润滑油中的最佳添加量分别为0.004%(质量)和5%(质量)，此时润滑油的极压润滑性能能够提高11倍以上，且在应用过程中展现出了很好的降温、降噪和减振作用。

关键词: 石墨烯, 表面改性, 制备, 极压润滑, 稳定性, 磨损