Abstract: A kind of high load and low corrosion EP- antiwear additives was synthesized and characterized by IR and elementary analysis. It was added to the base oil of polyol esters for performance evaluation to investigate their load-carrying properties, corrosion and oxidation stability. The results were compared with those of commercial products. The results showed that the developed additives were better than the compared ones in corrosion and oxidation stability as well as thermal stability, especially in load-carrying properties and lubricating property. The product specifications were formulated and batch stability was studied.

Key words: extreme pressure antiwear additive, phosphorous-nitrogen agents, load-carrying properties, corrosion and oxidation stability