Submitted to: American Oil Chemists' Society Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 10/15/2008
Publication Date: 10/16/2008
Citation: Asadauskas, S.J., Mcclure, T., Biresaw, G. 2009. Comparison of Extreme Pressure Additive Treat Rates in Soybean and Mineral Oils Under Boundary Lubrication Conditions. American Oil Chemists' Society Meeting. p. 15.
Technical Abstract: Traditionally, it is considered that, under boundary lubrication conditions, the reduction in friction and wear is mostly dependent on Extreme Pressure (EP) additives, rather than the basestock. However, several studies indicate that vegetable oils also contribute to the lubricity under this regime. In this investigation, Four Ball Extreme Pressure and Twist Compression Tester were used to compare lubricating characteristics under boundary lubrication conditions. Four major additives were tested in both conventional soybean oil and paraffinic mineral oil (150N) of similar viscosity: chlorinated EP additive, sulfurized EP additive, Zinc dialkyl dithiophosphate (ZDDP) and polymer ester. Their treat rates in soybean oil and 150N oil formulations were varied and compared. Both tests showed that the treat rates of chlorinated, sulfurized and ZDDP additives in 150N oil had to be much higher in order to achieve the same performance as that of soy oil blends. This suggests that soy oil might provide cost effective routes for industrial fluids, gear lubricants and possibly engine oils.