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Effects of Chlorinated Paraffin and ZDDP Concentrations on Boundary Lubrication Properties of Mineral and Soybean Oils

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Abstract

Concentration effects of chlorinated paraffin and zinc di-ethylhexyl dithio phosphate on boundary lubrication properties were tested in vegetable and mineral base stocks. Solvent refined low sulfur paraffinic mineral oil (150 N oil) and conventional food grade soybean oil (soy oil) with EP additive concentration of 0–20% (w/w) were used in ASTM D2783 four-ball extreme pressure (4-ball EP) and Twist Compression Tribotests (TCT). Weld points in 4-ball EP and times to failure in TCT at 200 MPa showed that 150 N oil needed more than double treat levels of EP additives to achieve similar boundary lubrication performance as their 5% blends in soy oil. Also, incorporation of 20% soy oil into 150 N oil-based EP additive blends improved the performance to nearly the same level as soy oil only blends of corresponding additives. Boundary lubricity of some soy oil samples was similar to that of a commercial straight oil chlorinated metal forming lubricant. Several suggestions are provided to explain such pronounced influence of the base stock type on EP additive response. The findings suggest that soy oil and other farm-based oils may provide strategies for formulating cost effective industrial fluids and other lubricants.

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Acknowledgments

United Soybean Board grant 8420 “Soybean oil to improve boundary lubrication of metalworking fluids”, European Commission grant MIRG-CT-2006-044802 “Lubricant Chemistry”, Lithuanian State Science and Studies Foundation grant B—16/2009 “Bioskalester” and cooperation of James R. Mieczkowski from Fuchs Lubricants Co. are sincerely acknowledged. The authors also gratefully appreciate Ms. Linda (Xiaozhou) Cao for help with 4-ball EP experiments, as well as Prof. Wilfred T. Tysoe (University of Wisconsin, Milwaukee) and Dr. John Baltrus (Department of Energy, National Energy Technology Laboratory) for the advice.

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Correspondence to Svajus Joseph Asadauskas.

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Names are necessary to report factually on available data; however, the Institute of Chemistry, TribSys LLC and US Dept of Agriculture neither guarantee nor warrant the standard of the product, and the use of the name by the Institute of Chemistry, TribSys LLC and Agricultural Research Service, US Department of Agriculture implies no approval of the product to the exclusion of others that may also be suitable.

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Asadauskas, S.J., Biresaw, G. & McClure, T.G. Effects of Chlorinated Paraffin and ZDDP Concentrations on Boundary Lubrication Properties of Mineral and Soybean Oils. Tribol Lett 37, 111–121 (2010). https://doi.org/10.1007/s11249-009-9496-5

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