5231 High-Pressure Viscosity Measurements of Vegetable Based Biodegradable Oils up to 2.5GPa and Tribological Characteristics

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  • 5231 植物油脂系生分解性油の2.5GPaまでの高圧粘度測定とトライボロジー特性(S66-2 サステイナブルトライボロジー(2),S66 サステイナブルトライボロジー)

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To provide sustainable and environmentally friendly lubrication with high-pressure rheological and tribological data of biodegradable vegetable oils, their high-pressure viscosity and phase transition were evaluated employing a diamond-anvil pressure cell. And friction and wear properties for these oils were evaluated employing a SRV tribo-tester. High-pressure viscosity of 7 oils including rapeseed oil, soybean oil and polyol ester (POE) were resulted to show almost the same features and values. Pressure-viscosity coefficients of all oils around maximum pressure were 7/GPa (0.5-1.4GPa) at 100℃ and 3-4/GPa (1.8-2.7GPa) at 200℃. Finally, lubricant oils except for POE were observed to transit to polycrystal-like phase. Friction coefficient for all the oils was about 0.1. Wear amount of POE was to be over twice larger than that of vegetable oils.

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