石墨烯/三组分固体润滑剂/丁腈橡胶复合材料的制备及性能

Preparation and Performance of Graphene/Three-Component Solid Lubricants/Nitrile Rubber Composites

采用机械共混法制备石墨烯/三组分固体润滑剂(3phr石墨、3phrMoS_(2)、12phr聚四氟乙烯(PTFE))/丁腈橡胶复合材料,研究了复合材料的力学性能、摩擦磨损性能和摩擦振动性能,对比了经1-羟乙基-3-甲基咪唑四氟硼酸盐离子液体改性前后,石墨烯对复合材料性能的影响。通过扫描电子显微镜观察发现,经离子液体改性后,石墨烯团聚现象明显改善,在复合材料中的分散性得到提高,对复合材料的力学性能、摩擦磨损性能和摩擦振动性能提升更为显著。填充3phr的改性石墨烯后,复合材料的拉伸强度提升11.4%、撕裂强度提升10.7%、断裂伸长率提升9.5%、压缩模量提升16.1%,复合材料在66N载荷下的环-块摩擦磨损试验中其摩擦系数降低了16.5%、体积磨损率降低了17.9%、摩擦振动减小了3.7dB。

The graphene/three-component solid lubricants(3 phr graphite,3 phr MoS_(2),12 phr PTFE)/nitrile rubber composites were prepared by mechanical mixing method.The mechanical properties,friction and wear properties and frictional vibration properties of the composites were investigated.The effects of graphene before and after modification with 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate ionic liquid on the properties of composites were compared.The SEM results show that the agglomeration of graphene is significantly improved after ionic liquid modification,the dispersibility of graphene in composites is improved,and the mechanical properties,friction and wear properties and friction and vibration properties of the composites are significantly improved.After filled with 3 phr modified graphene,the tensile strength,tear strength,elongation at break and compression modulus of the composites are increased by 11.4%,10.7%,9.5%and 16.1%,respectively.By the ring-block friction and wear test of the composites at 66 N load,the friction coefficient,volume wear rate and friction vibration are decreased by 16.5%,17.9%and 3.7 dB,respectively.