Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract only
Publication Acceptance Date: 1/15/2003
Publication Date: 5/1/2003
Citation: Cheenkachorn, K., Lloyd, W., Erhan, S.Z., Perez, J. 2003. An evaluation of additives in vegetable oils using the PDSC and PSMO. Annual Meeting and Expo of the American Oil Chemists' Society. p. 126. Interpretive Summary:
Technical Abstract: The oxidation stability of several soybean base oils for lubricant applications is compared. The effectiveness of different additives in these oils is evaluated by Penn State Microoxidation (PSMO) and Pressurized Differential Scanning Calorimetry (PDSC). The additives include a phenol, an amine, copper naphthenate and a secondary zinc dithiophosphate. The base fluids include a normal refined soybean oil, a high oleic soybean oil, two partially hydrogenated soybean oils, a TMP ester and an Epoxidized soybean oil. Oleic acid content in the fluids ranged from 23 to 100 percent. Some additives performed differently in the two tests. In the Epoxidized soybean oil, the phenol, amine and copper naphthenate performed well but the zinc dithiophosphate by itself resulted in ring opening and promoted oxidation in this oil. The oxidation rates are consistent with the degree of unsaturation. The Epoxidized soybean oil exhibits the best stability of the soybean oils tested.