Synthesis And Tribological Study Of Lubricant Additive

The lubricating oil is the blood that the machinery operated and it works normally to mobilize confidentially at the necessity of lubricating oil. Performance of lubricating oil are closely related with exertion of additive. The experiences of the lubricating oil and additive are asked to follow the adaptation with the motor in initial stage. After time, the experiences of the lubricating oil and additive are changed to need to widely meet the needs of environmental protection and energy-conservation. When mixed with the lubricating oil, the additive can improve lubricating oil's abilities of extreme pressure, anti-wear and reduce frictional resistance, so as to lengthen the service life of the machine.This paper introduced synthesis of two lubricant additives. One is borate ester containing element of nitrogen, another is Fe₃O₄ nanoparticle which contains stearic acid at surface. And a four - ball tester was employed to evaluate its extreme pressure, anti-wear and friction-reducing properties.The borate ester containing nitrogen has been synthesized by two step chemical reaction; and it's purity about 85%. This article found proper condition and discussed some influence factors, including the synthetic method, the reaction time and the reaction temperature. And which are regarded as the research object, to investigate the hydrolysising performance.Basing on chemistry modification method, stearic acid and Fe₃O₄ nanoparticle are used to synthesize Fe₃O₄ nanoparticle which contains stearic acid at surface by microwave radiation with water and n-propanol. Then we analyzed it by IR, XRD, TEM and dispersion experiment.We analyzed various additive effects on tribology performance of lubricant by comparing wear resistance of borate ester containing nitrogen and Fe₃O₄ nanoparticle which contains stearic acid at surface. We analyzed tribology performance of lubricant and compared the effect on improvement of tribology performance by adding additives into liquid paraffin. In this paper, the friction-reducing and antiwear behaviors of borate ester containing nitrogen and Fe₃O₄ nanoparticle in liquid paraffin were investigated using a four-ball machine, and we have tested P_B, f and WSD. We evaluated the results of test and found the optimum proportion of borate ester containing nitrogen is 0.25%, Fe₃O₄ nanoparticle is 1.00%. We also found the two additives both enhance the intensity and load of liquid paraffin and improve the tribological properties.At last, we made borate ester containing nitrogen and Fe₃O₄ nanoparticle which contains stearic acid at surface composited as lubricant additive. The tribological behaviors of the synthetic products as additives in liquid paraffin were investigated on a four-ball machine. It was found that both the borate ester containing nitrogen and Fe₃O₄ nanoparticle as additives functioned to significantly improving the friction-reducing, antiwear, and extreme-pressure properties of the base oil. We found the optimum proportion of borate ester containing nitrogen is 0.50%,Fe₃O₄ nanoparticle is 0.50%.This determined tribological behaviors of the combined additive is better than each individual one.