Investigation of Tribological Performance of Eco-friendly Pentaerythritol Tetraoleate Ester Based Calcium Complex Grease

The excessive use of petroleum products has led to the rapid depletion of conventional oil resources and negative environmental impacts. Consequently, a growing demand for “eco-friendly grease” relies on sustainable resources. Mere innovations in thickeners are not sufficient. To address this issue, it is essential to introduce novel eco-friendly base oil and complexing agents. Consequently, a series of new grease formulations were developed, using pentaerythritol tetraoleate ester as the base oil along with sebacic acid and azelaic acid in a calcium stearate thickener. The performance of these formulations was evaluated using a four ball friction tester. The results showed a 10.6