Experimental Researches on Additivated Biodegradable Greases

In the recent years, the lubricating market is demanding new biodegradable products based on renewable resources as a consequence of progressively more strict environmental regulations. This work is focused on the rheological study of biodegradable greases based on rapeseed oil and beeswax, additivated with graphene or graphite nanoparticles. For this study, different grease samples have been prepared and each of them were thermal analysed in the range of 20 °C … 50 °C. The rheological tests indicate that the greases have non-Newtonian behaviour, which are rheological described by the Bingham model. Finally, the thermal variation of the rheological parameters (yield stress and viscosity) was obtained, in the mentioned temperature range. (paper)