Submitted to: Journal of the American Oil Chemists' Society
Publication Type: Peer reviewed journal
Publication Acceptance Date: 10/20/2005
Publication Date: 2/1/2006
Citation: Castro, W., Perez, J.M., Erhan, S.Z., Caputo, F. 2006. A study of the oxidation and wear properties of vegetable oils: Soybean oil without additives. Journal of the American Oil Chemists' Society. 83(1):47-52. Interpretive Summary: Vegetable oils, such as soybean oil, are the main biodegradable lubricant ingredients used worldwide. However, there are concerns as to their stability at low and high temperature application. Improvements in oxidative stability would increase the use of vegetable oils in the lubricant market. In this study, the effect of chemical compositions on oxidative stability was evaluated. A better understanding of the effect of chemical compositions aids the selection of additives and in turn prevents the problem of instability.
Technical Abstract: The use of biodegradable lubricants continues to increase in diverse applications. Vegetable oils, such as soybean oil, are the main biodegradable lubricant base stocks used worldwide. However, there are concerns as to their oxidative stability and low temperature performance. Improvements in oxidation stability can be made through chemical or genetic modifications. This work compares the effect of chemical composition. The oxidation stability, wear and friction performance soybean oil, high oleic soybean oil and epoxidized soybean oil are compared in laboratory bench tests. Tests conducted include the Penn State Sequential Four Ball wear test and Micro Oxidation test (PSMO). Oxidation products from the PSMO test are analyzed by Fourier Transform Infrared (FTIR) and Gel Permeation Chromatography (GPC). In this paper all oils are evaluated neat, without additives.