Use of an Ionic Liquid as an Additive for Environmentally Friendly Lubricants

Abstract

The lubricating properties of trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate (IZh-FF) as an additive in PAO 4 synthetic base oil and vegetable oils are investigated. These base oils are environmentally friendly and readily biodegradable. It has been shown that phosphonium ionic liquid improves the lubricating properties of environmentally friendly base oils; however, its efficiency depends on the origin of the base oil and the working temperature of the friction pairs. The greatest effect (wear reduction) was obtained using ionic liquid with the PAO 4 base oil at 30°C, while the lowest wear and friction were observed using 5% phosphonium ionic liquid with vegetable oil. The 5% IZh-FF modified vegetable oil can be used where an environmentally friendly oil is needed.