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Abstract
In the long term, environmental friendly oils from renewable sources seem to be the more realistic path to a sustainable future for the industry regarding the lubrication issue. Vegetable bases for lubricants have been studied in the last decade in order to analyze their potential industrial applicability. Their strengths and weaknesses are already known and thus, the next step is to study how the final mixture of vegetable base plus additives might perform in comparison to lubricants used in actual machinery. Here, we present the results obtained for the viscosity behavior of two hydraulic mineral oils and two vegetable oils formulated to substitute the mineral based ones. The measurements were taken at three temperatures: 313.15K, 343.15K and 363.15K and at pressures up to 250MPa using a high-pressure falling-body viscometer. To address the performance of these oils in the elastohydrodynamic lubrication regime, we also calculate the universal pressure–viscosity coefficient, αfilm, and the temperature–viscosity coefficient, β.
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