Preparation And Research Of Fluorine-containing Lubricant Additives

Special electronic structures of Rare earth elements and unique crystal structures of rare earth compounds exactly show excellent abrasion resistance,which has a broad application prospect in lubricating materials,especially nano rare earth fluoride as additives in lubricating oil anti-wear and excellent anti-friction performances,being a kind of efficiently multi-functional lubricating oil additives.The paper introducingpreparation of silane coupling agent modified nanometer LaF3 powder additives,and use the base oil which isprovided by a company to joining prepared additive fabricating oil sample tests and its dispersion stabilities,high temperature stabilities and tribological properties,including friction coefficient,grinding spot diameter(WSD)and the maximum non seizer load PB,and observation of the worn surface of the steel ball wear scar morphology,The optimum reaction conditions as follows:reaction temperature 60?,reaction time I hour,with the method of freeze-drying synthetic nano LaF3 powder additives.nanometer LaF3 powder additives in base oil has good dispersion stability and high-temperature stability.Using four-ball friction and wear testing machine to detect the tribological performance of additives,the results show that when adding amount was 1.2%,the average friction coefficient can reach 0.065,35%lower than that of base oil,grinding spot diameter is 0.51 mm.reduced 19.04%,PB value reached 833N,2.12 times for base oil.In this paper,at the same time using silane coupling agent and methyl oleate common modified additive in preparation of nano LaF3 liquid.Preparation technology is:preparing silane coupling agent modified LaF3 gel at 60?,the well prepared nano LaF3 would have been transferred to the oil acid methyl esterby phase transfer method,reaction after rotary evaporation excess petroleum ether finally get LaF3 liquid additives.Nano LaF3 liquid additives in base oil has better dispersion stability and high-temperature stability than nano LaF3 powder additive.Through TG-DTA analysis the nm LaF3 liquid additives show that nanometer LaF3 liquid additive has good thermal stability.Comparingnano LaF3 liquid additives and ZDDP content of tribology performance,the results show that in 100N based oil,nm LaF3 liquid additives'tribological performance is better than that of ZDDP,when the nm LaF3 liquid additives adding amount was 1.0%,the smallest friction coefficient 0.054,PB value to achieve the maximum of 980 N,2.45 times for base oil,grinding minimum spot diameter of 0.46 mm.the minimum wear scar diameter is 0.46mm.By scanning electron microscopy(SEM/EDS)analyzing the steel ball surface.Results show that adding LaF3 liquid lubricant additives of steel ball wear surface more smooth than LaF3 powder additives,synthetic during the course of friction,the synthesized borate esters were reacted with the steel surface and formed a complex low shear strength chemical reaction film containing La and F on the surface of the steel balls.