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Han, Du Hee,Masuko, Masabumi,Kim, Beom Sik,Lee, Jung Min,Ahn, Hong Chan,Suh, Jeong Kwon 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.4
We have investigated the antiwear additive response of 12 kinds of base oils. Five polyalkylene glycols and five polyol ester base oils were used as polar base oils. A mineral oil and alkylnaphthalene were used as non- or low-polarity base oils. Tricrecylphosphate (TCP) was added as an antiwear additive to all the base oils. The optimum concentrations of TCP for minimum wear of all of the base oils were determined by a four-ball tribometer, and the difference between them were compared. The optimum concentrations of TCP for minimum wear could be explained reasonably by comparing of the relative stability of TCP molecules in the base oils. The relative stability of TCP molecules in the base oils could be explained by a solvation model that was governed by two parameters (polarity and molecular size) of the polar base oils. Ultimately, all of the optimum concentrations for minimum wear of TCP-formulated oils could be interpreted from the difference in stability of TCP molecules, which was anticipated by the solvation model. In addition, from this model, a quantified equation was derived: C ∝ (MW_(Base Oil) / MW_(TCP))^(+2.71)·(ε_(Base Oil))^(3.38).