Hugging TCP (Trierecylphosphate): Wear Response of Polar Base Oils interpreted from Interaction Model between TCP and Base Oil

De Hee Han; Masabumi Masuko; Beom Sik Kim; Jung Min Lee; Hong Chan Ahn; Jeong Kwon Suh

Journal of Industrial and Engineering Chemistry, Vol.10, No.4, 558-563, July, 2004

De Hee Han^†, Masabumi Masuko¹, Beom Sik Kim , Jung Min Lee , Hong Chan Ahn, and Jeong Kwon Suh

Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
¹Department of Chemical Engineering, Tokyo Institute of Technology, Meguro-ky, Tokyo 152-8552, Japan

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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.

Keywords:solvation;stability;polyol ester;polyalkylene glycol;antiwear additive

[References]

Asadauskas SJ, Perez JM, Duda JL, Prepr. Am. Chem. Soc. Div. Pet. Chem., 42, 246 (1997)
Randles SJ, Wright M, Synth. Lubr., 9, 145 (1992)
Torsten M, Mineraloeltechnik, 37, 17 (1992)
Sundaresan SG, Finkenstadt WR, ASHRAE Trans., 98, 796 (1992)
Johnston GE, Shim J, Brechot PD, Synth. Lubri., 11, 234 (1995)
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Novick NJ, Mehta PG, McGoldrick PB, Synth. Lubr., 13, 19 (1996)
Sung JH, Hyun YH, Kwon DH, Choi HJ, J. Ind. Eng. Chem., 8(1), 28 (2002)
Bieber HB, Klaus BB, Tewksbury BJ, ASLE Trans., 11, 155 (1968)
Han DH, Masuko M, STLE/Tribol. Trans., 41, 600 (1998)
Han DH, Masuko M, STLE/Tribol. Trans., 42, 902 (1999)
Han DH, Masuko M, J. KSTLE, 17, 146 (2001)
Hilderbrand JH, Scott RL, The Solubility of Nonelectrolytes, Reinhold Pub., New York (1950)
Dobry A, Keller R, J. Phys. Chem., 61, 1448 (1957)

[Related Articles]

[1] Asadauskas SJ, Perez JM, Duda JL, Prepr. Am. Chem. Soc. Div. Pet. Chem., 42, 246 (1997)

[2] Randles SJ, Wright M, Synth. Lubr., 9, 145 (1992)

[3] Torsten M, Mineraloeltechnik, 37, 17 (1992)

[4] Sundaresan SG, Finkenstadt WR, ASHRAE Trans., 98, 796 (1992)

[5] Johnston GE, Shim J, Brechot PD, Synth. Lubri., 11, 234 (1995)

[6] Remigy JC, Nakache E, Brechot PD, Synth. Lubr., 14, 237 (1997)

[7] Novick NJ, Mehta PG, McGoldrick PB, Synth. Lubr., 13, 19 (1996)

[8] Sung JH, Hyun YH, Kwon DH, Choi HJ, J. Ind. Eng. Chem., 8(1), 28 (2002)

[9] Bieber HB, Klaus BB, Tewksbury BJ, ASLE Trans., 11, 155 (1968)

[10] Han DH, Masuko M, STLE/Tribol. Trans., 41, 600 (1998)

[11] Han DH, Masuko M, STLE/Tribol. Trans., 42, 902 (1999)

[12] Han DH, Masuko M, J. KSTLE, 17, 146 (2001)

[13] Hilderbrand JH, Scott RL, The Solubility of Nonelectrolytes, Reinhold Pub., New York (1950)

[14] Dobry A, Keller R, J. Phys. Chem., 61, 1448 (1957)