The tribological properties of lubricating greases produced on vegetable base and modified of polytetrafluoroethylene

Authors

• Rafal Kozdrach Research Network Lukasiewicz - Institute for Sustainable Technologies

DOI: https://doi.org/10.30678/fjt.84884

Keywords:

lubricating grease, modified additive, tribological properties, rolling contact fatigue, rheological properties, the correlation function MSD, the storage modulus G’, the loss modulus G’’

Abstract

The article presents the results of research on the influence of polytetrafluoroethylene additive on the tribological and rheological properties of selected lubricant compositions.

Based on the obtained test results, it was found that the introduction of a modifying additive to the lubricant structure allows a significant reduction of the coefficient of friction, thus increasing the efficiency of tribological protection of the tribosystem.

All lubricating compositions modified with at least 1% polytetrafluoroethylene guarantee effective anti-wear protection under load conditions of the tribosystem. Modification of the tested lubricating compositions with the applied additive affects the increase of indicators characterizing the fatigue life of the examined lubricating greases based on sunflower oil. The introduction of the polytetrafluoroethylene into the structure of the tested lubricants changed the values of the MSD correlation function and the G’ and G’’ modules, which significantly influenced the internal structure of the tested lubricant compositions.