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Title: Reduced Need of Lubricity Additives in Soybean Oil Blends Under Boundary Lubrication Conditions

item Biresaw, Girma

Submitted to: American Oil Chemists' Society Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 5/4/2009
Publication Date: 5/6/2009
Citation: Asadauskas, S., Mcclure, T., Biresaw, G. 2009. Reduced Need of Lubricity Additives in Soybean Oil Blends Under Boundary Lubrication Conditions. American Oil Chemists' Society Meeting. p. 75.

Interpretive Summary:

Technical Abstract: Converging prices of vegetable oils and petroleum, along with increased focus on renewable resources, gave more momentum to vegetable oil lubricants. Boundary lubrication properties of four Extreme Pressure (EP) additive blends in conventional Soy Bean Oil (SBO) and Paraffinic Mineral Oil (PMO) of similar viscosity were screened using Four Ball EP tester (4-ball EP) and Twist Compression Tester (TCT) on steel surfaces. Chlorinated hydrocarbon waxes (CLHW), zinc di-ethylhexyl dithio phosphate (ZDDP), di t-dodecyl pentasulfide (DTPS) and polymerized saturated fatty esters (PSFE) were evaluated at 3 to 20% concentrations in the two oils, inhibited with antioxidant. Weld points in 4-ball EP and Coefficient of Friction in TCT at 200 MPa or 8 MPa showed that much lower CLHW, ZDDP and DTPS treat levels are needed in SBO to achieve the same performance as PMO blends. PFSE was effective in PMO, but not in SBO. Adding 20% SBO to PMO blends made their boundary lubrication properties similar to those of SBO based blends. CLHW and ZDDP at 5% in SBO produced similar wear as their 20% blends in PMO. Commercial straight oil chlorinated metal forming lubricant showed performance, comparable to that of the best SBO blends. Addition of SBO can greatly reduce the additive costs when formulating industrial oils and other lubricants.