Research On The Tribological Properties Of Polypyrrole As A Conductive Grease Additive

With the rapid development of social economy,electricity has become the main energy consumption of industrial production,electrical equipment as an important basic equipment of modern industry,and the connection quality of electrical equipment seriously affects the life of equipment.The use of grease at the connection of electrical equipment can effectively alleviate the phenomenon of overheating and corrosion,to ensure the safety and reliability of the electrical connection of the equipment,the grease used in the electrical contact area requires good anti-wear and friction performance and excellent conductivity or insulation performance.In this paper,PAO40 was selected as the base oil to prepare composite lithium-based grease,polypyrrole was used as a conductive grease additive,and the effects of different dopants on the lubricating properties and conductivity of polypyrrole as a grease additive were studied under non-current-carrying conditions and current-carrying conditions,and the research content and results were as follows:(1)PAO40 was selected to prepare complex lithium-based grease,hydrochloric acid,dodecyl benzenesulfonic acid and tetrafluoroborate ionic liquid(L-B104)were doped with polypyrrole,and polypyrrole was used as a conductive additive to prepare conductive grease.Under the conditions of non-current-carrying friction and current-carrying friction,polypyrrole doped with three acids can improve the physical and chemical properties of grease,reduce the resistivity of grease,and show excellent tribological and conductive properties.Among them,1%PPY(L-L104)grease performed best.(2)The base grease is a composite lithium-based grease,with L-B104,L-F104 and L-L104 ionic liquids doped with polypyrrole,polypyrrole as a conductive additive to prepare conductive grease,under the conditions of non-current-carrying friction and current-carrying friction,the average friction coefficient,grinding width and resistance of the grease prepared by the three ionic liquids as polypyrrole dopants are significantly reduced,showing excellent anti-friction and electrical conductivity,among which 0.2%PPY(L-B104)grease has the best tribological properties.(3)The base grease was a composite lithium-based grease and the dopant was L-B104 ionic liquid,and ILs-PPY,ILY-PPY/GNSs and ILs-PPY/WS2 composites were prepared as composite lithium-based grease additives.In the conditions of non-current-carrying friction and current-carrying friction,ILs-PPY,ILs-PPY/GNSs,ILs-PPY/WS2 grease showed excellent friction and anti-wear performance and electrical conductivity,and 1%ILs-PPY/WS2 grease had lower average friction coefficient,grinding spot width and contact resistance.(4)Based on random forest,support vector regression and partial least squares algorithm,based on experimental data,the experimental data are mainly composed of the type and content of basal grease,additives and experimental load,supplemented by data processing,respectively,the friction coefficient prediction model and the grinding spot width prediction model are established,the results show that the random forest algorithm has a good effect on the tribological performance prediction of grease,and the contribution of characteristic variables to the tribological performance is determined.