Abstract
The use of soybean oil as an alternative lubricant is being investigated extensively, but its relatively rapid thermaland oxidative polymerization restricts its usefulness. Measurement of polymerized oil film thickness and film weight, asmethods for quantifying the degree of polymerization, were investigated. The miscibility and polymerization behavior of crudesoybean oil, proprietary commercial biobased drip oil (BDO), soybean methyl esters, glycerol, and water and their mixtureswere investigated. In a separate study, the antioxidant characteristics of Tenox, 2,2,4,5,5Pentamethyl3imidazoline1oxyl (PMIO), ethylenediaminetetraacetic acid (EDTA), and ionic copper in acidic and alcohol media each in 1% (w/w)concentrations and their formulations mixed with soybean oil were investigated. In the first study, measurement ofpolymerized film weight was preferable to measurement of film thickness for quantifying the extent of polymerization. Soybeanmethyl esters showed the least degree of polymerization. In the next study, ionic copper in acidic media showed the highestresistance to polymerization, followed by the mixture of PMIO and Tenox. The treatments that contained EDTA and Tenoxhad antioxidant properties that were superior to that of the BDO. PMIO tended to promote the polymerization process.
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