Elastohydrodynamic study of vegetable oil–polyalphaolefin blends

Abstract

Two polyalphaolefi ns, of higher and lower viscosity than vegetable oils, were used to make binary blends of varying compositions with soy bean and canola oils. The pure oils and the blends were used in viscosity and fi lm thickness investigations. The effects of composition and temperature on viscosity were found to agree well with the theoretical predictions of a simple mixing law. The fi lm thicknesses of the various blends under elastohydrodynamic conditions were measured at 20 N load, and varying entrainment speeds and temperatures. From the data, pressure-viscosity coeffi cients, α, as a function composition and temperature were obtained. The resulting α values were compared with theoretical predictions. Experimental values of α as a function of composition showed a slight negative or no deviation from the values predicted by an ideal mixing model. On the other hand, experimental values of α displayed a mild decrease with increasing temperature, while the model predicted a sharp decrease with increasing temperature. Published in

Renewable feedstocks for lubricant production

“…One approach is to blend plant-based oils with non-polar synthetic or petroleum-based oils (e.g. PAOs) that have complementary properties [170]. Blending with non-polar fl uids strongly affects the surface and interfacial properties and therefore various lubricant functions [171].…”

Bio-based lubricants for forming of magnesium

“…Klocke et al [18] report the development and application of a new tool coating which allows chlorinated paraffin oil to be replaced by a new environmentally benign, biodegradable, rape oil based lubricant. Bantchev and Biresaw [3] used polyalphaolefin to make binary blends of varying compositions with soy bean and canola oils. Tribological properties of lubricants with different compositions were investigated and pressure-viscosity coefficients were determined.…”

Formulating lubricating oils

“…Also low-cost mixtures of corn oil and synthetic diesters, in particular di-2-ethylhexyladipate (DOA) and di-2-ethylhexylsebacate (DOS), have been described as base stock oils for lubricants [15]. Binary blends of PAOs with vegetable oils (canola, SBO) have been studied in relation to their elastohydrodynamic (EHD) properties [16]. In PCT Int.…”