| More than 50% of the world primary energy loss attributes to the friction and abrasion, meanwhile, the lubrication is an effective measures to reduce these losses.Additive in lubricating oil is the main factor that determines the lubrication quality of the content and performance, in short, the quality of basic oil is the fundamental factor, and the performance of additive is the essence of lubircating oil. With the emergence of nanomaterials, quantum size effect, surface effect, small size effect,and interface with surface effect of nanometer materials are widly researched. When some certain nanoparticles are added as additives to lubricating oil, it can exert unexpected lubrication effect on the friction pair, especially under the environment of overload, high speed, high temperature, low temperature, and heavy pollution. Nano materials can show good tribological properties as lubricant additive. Therefore, the application of nanometer materials to marine lubricating oil additive product research is currently an important topic.Recent years, nanoscale calcium sulfonate with high base number and acid neutralization capability, anti-friction and anti-wear effect of additive has been rapidly developed. Among them, the medium and high alkali value of additive products have been widely applied in the market. At present, with the economy environment continues to weaken, problems become increasingly serious, including the diminish of international trade volume and long-term low load operation of sailing vessels. The resulting low temperature corrosion phenomenon makes vessel operating companies bring forward higher requirements of base number of marine lubrication oil. As a result, the super-overbased nanoscale calcium sulfonate has gradually become a hotspot. Primarily, the paper discuss the preparation and synthetic process of super-overbased nanoscale calcium sulfonate, using Fourier infrared spectrometer to characterize the molecular structure of the sample, and Melvin laser particle size analyzer to characterize the particle size distribution of sample. Afterwards, samples are tested with different proportion of additives in the friction coefficient under different load, using SRV multifunctional testing machine, and a four-ball friction testing machine is applied to measure the maximum free card bite loading value of different oil sample. Compare all these experimental data above with basic oil. At last, combine the relevant theory of tribology with experimental data, analysis the tribological properties of super-overbased nanoscale calcium sulfonate of marine lubricating oil, combining with the knowledge of nano tribology theory, resolve the tribological mechanism of additive products. The experimental results show that the lubricating oil with 6% of super-overbased nanoscale calcium sulfonate added can significantly improved the tribological properties of lubricating oil. |
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