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Research Papers: Lubricants

Multiresponse Optimization of a Hydraulic Oil Formulation by Mixture Design and Response Surface Methods

[+] Author and Article Information
H. Khalilian, H. Haddadi

Department of Analytical Chemistry,
Faculty of Sciences,
University of Shahrekord,
P.O. Box 115,
Shahrekord 88186-34141, Iran

A. Semnani

Department of Analytical Chemistry,
Faculty of Sciences,
University of Shahrekord,
P.O. Box 115,
Shahrekord 88186-34141, Iran
e-mail: a.semnani1341@ gmail.com

M. Nekoeinia

Department of Chemistry,
Payamnour University,
Tehran 19395-4697, Iran

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 24, 2015; final manuscript received June 11, 2015; published online September 23, 2015. Assoc. Editor: Ning Ren.

J. Tribol 138(2), 021801 (Sep 23, 2015) (5 pages) Paper No: TRIB-15-1024; doi: 10.1115/1.4031397 History: Received January 24, 2015; Revised June 11, 2015

The field performance of hydraulic oils depends on factors such as the viscosity index (VI), flash point (FP), pour point (PP), and demulsibility. A hydraulic oil formulation was performed by applying a multiresponse optimization, for which the PP was minimized, the FP, demulsibility, and VI were maximized. The range of viscosities at 40 and 100 °C was selected according to the International Organization for Standardization (ISO) viscosity grade for hydraulic oil. The experiments were accomplished according to an extreme vertices mixture design using solvent neutral-100 (SN-100) and SN-500 as major components and polyisobutene (PIB) as minor component. The results shows that the optimum formulation consisted of 37.5% SN-100, 60% SN-500, and 2.5% PIB, and the values of FP, PP, VI, demulsibility at 30 mins and viscosities at 40 and 100 °C were equal to 227 °C, −6 °C, 107.5, 28/2012/40, 67.3 cS, and 9 cS, respectively.

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Figures

Grahic Jump Location
Fig. 1

Combination region among variables for (a) “viscosity at 40 °C” (Y1), (b) “viscosity at 100 °C” (Y2), (c) “VI (Y3),” (d) “FP (Y4),” (e) “PP (Y5),” and (f) “demulsibility (Y6)”

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