Pressure Viscosity Coefficient of Vegetable Oils

Pressure‐viscosity behaviour and film thickness in elastohydrodynamic regime of lubrication of ionic liquids and other base oils

“…For esters and poly(propylene glycol) dimethyl ethers, the values were taken from Pensado et al . and Paredes et al ., whereas the values of the vegetable oils were determined by Biresaw and Bantchev by optical interferometry.…”

“…Biresaw and Bantchev found from film thickness measurements that the pressure‐viscosity coefficients of the seed oils at 313.15 K, are 10.7, 8.3 and 7.4 GPa −1 for canola, soybean and jojoba oils, respectively. These authors remark that for a reference oil (PAO6), this coefficient is 13.5 GPa −1 .…”

“…56 for canola, jojoba and soybean, respectively. We have calculated these values from the dynamic viscosities and the pressure‐viscosity coefficient reported by Biresaw and Bantchev. The film thickness part dependent on the lubricant at 313.15 K is clearly quite low for the biobased fluids, as well as for [C 2 C 1 Im][C 2 SO 4 ] and [C 1 OC 2 C 1 Pyrr][NTf 2 ].…”

“…We have also included in this work three vegetable bases (canola, soybean and jojoba) studied by Biresaw and Bantchev, which we consider somehow representative of the viscosity spectrum comprised by the available oils obtained from crops. These bases have viscosity grades of VG22 and VG32, such as the majority of the oils produced from seeds.…”

“…In this work, we present an analysis of the VI as well as the derived properties obtained from the measurements of the viscosity at high pressures (the pressure‐viscosity coefficient and the film thickness) performed in our laboratory for 16 unformulated lubricants of different type (POEs, PAGs and ILs). In addition, comparisons with results published by Biresaw and Bantchev on vegetable bases (canola, soybean and jojoba oils) are also performed.…”