RT Journal Article
T1 Lubricant properties of trimethylolpropane trioleate biodegradable oil: High pressure density and viscosity, film thickness, Stribeck curves and influence of nanoadditives
A1 García Guimarey, María Jesús
A1 Gonçalves, David E. P.
A1 Liñeira del Río, José Manuel
A1 Pérez Comuñas, María José
A1 Fernández Pérez, Josefa
A1 Seabra, Jorge H. O.
K1 Viscosity-pressure coefficient
K1 Film thickness
K1 Friction
K1 Trimethylolpropane trioleate
K1 Nanoparticles
AB Lubricant properties of trimethylolpropane trioleate synthetic base oil (TMPTO) were experimentally determined under different temperatures, pressures and rolling-sliding conditions. With the aim to obtain the viscosity-pressure coefficient, density and viscosity measurements were performed up to 150 MPa with a falling-body viscometer and a vibrating tube densimeter, respectively. Film thickness and friction properties were determined with a ball-on-disc apparatus from temperatures of 303.15 to 353.15 K, from slide-roll ratios from 5 to 50% at 50 N (applied load). Finally, it has also been evaluated if the use of nanoparticles as additives could involve changes on film thickness and Stribeck curves of TMPTO base oil. For this aim, hexagonal-boron nitride nanoparticles (h-BN) and graphene nanoplatelets (GnPs) were used at mass concentrations of 0.25, 0.5 and 1.0 wt%. The viscosity of TMPTO increases from 15 mPa s (at 10 MPa and 353.15 K) to 525 mPa s (at 150 MPa and 303.15 K). The Stribeck curves for TMPTO are placed between elastohydrodynamic and mixed lubrication. All nanolubricants show very similar Stribeck curves, being the lowest friction coefficient obtained for 0.25 wt% of GnP. It has been found that for most of the experimental conditions the addition of the GnP promotes an increase of the film thickness
PB Elsevier
SN 0167-7322
YR 2021
FD 2021
LK http://hdl.handle.net/10347/26712
UL http://hdl.handle.net/10347/26712
LA eng
NO Journal of Molecular Liquids 2021, 335, 116410; https://doi.org/10.1016/j.molliq.2021.116410
NO Spanish Ministry of Economy and Competitiveness, the European Regional Development Fund programme and the Xunta de Galicia have supported this manuscript through ENE2017-86425-C2-2-R, GRC ED431C 2020/10 and ED431E 2018/08 projects. Dr. María J. G. Guimarey acknowledges a postdoctoral fellowship from the Xunta de Galicia (Spain) and the financial support from IACOBUS programme
DS Minerva
RD 25 abr 2026