Lube-Tech
The low thickener content, especially in the case of lithium based greases, can bring cost savings to the grease producer in a market where rapid increase in the price of lithium hydroxide is observed due the demands for lithium to make batteries for the electrification age.
BO1, the base oil with a kinematic viscosity of about 375 (mm2/s), proved to be an excellent product for use in greases with low thickener content and excellent low temperature mobility.
BO2, the base oil with a kinematic viscosity of about 620 (mm2/s) and a high degree of solvency, greatly minimized the use of thickeners in greases with excellent water resistance. Furthermore, the low and stable friction coefficient and low degree of wear for BO2 and the greases based on BO2, in the boundary lubrication regime, indicated the potential for possible energy reduction and good lubricity in applications. The measured wear on balls and discs for Grease D (lithium complex grease based on BO2) were very low.
Furthermore, this study showed that base oils with high viscosity and good solvency such as BO1 and BO2 can be used successfully in grease formulations. There are reasons to believe that those benefits can be obtained either by using these oils on their own or in blends with paraffinic Group I, II and III base oils.
Reference 1) Fathi-Najafi M, Abrahams R., Malm L., When the going gets tough... A heavy specialty oil for grease formulations (Part II), NLGI 80th Annual Meeting, June 2013, USA.
2) Dodos, G. S. and M. Fathi-Najafi, Oxidation stability parameters as novel monitoring tools for a more robust grease production, 29th ELGI Conference, May 2017, Finland
LINK
www.nynas.com/en/
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.125 page 6
Acknowledgement The authors would like to thank a) Emma Öberg at Nynas AB, Helsinki, Sweden for her assistance in the preparation of the greases.
b) Dr. George Dodos at Eldon’s S.A., Athens, Greece for his support in this work.
Appendix A
LUBE MAGAZINE NO.154 DECEMBER 2019
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