Abstract
Environment-friendly lubricant is the key demand in twenty-first century for the issue of global climate change. Vegetable oils as base oil for lubricants and biodiesel fuel are environmentally preferable to petroleum. They are usually excellent boundary lubricants, but their high-pressure behavior is not investigated yet properly. In this research, first solidification characteristics of rapeseed oil, soybean oil, sunflower oil, palm oil, coconut oil, olive oil, camellia oil, mustard oil, castor oil, rapeseed methylester, and soybean methylester were investigated. Next, a very useful viscosity–pressure–temperature relation on the basis of phase diagram was derived for the nine vegetable oil.
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