Lube-Tech Conclusions
Long-term degradation of thin films of fully formulated lubricants shows that basestocks and additives affect the ability of oil to remain liquid despite severe oxidation. Large differences among well-established commercial lubricants can be observed using this methodology, which might explain why only some oils are “forgiving”. The thin film degradation method might be very helpful in predicting longevity of engine oils, hydraulic fluids or many other lubricants as well as various basestocks and their formulations with additives.
Low petroleum prices and rapid spread of electrical vehicles are producing major changes in lubricant industry. In long term, significant decline in engine oil demand can be anticipated, which would affect the whole lubricant industry. Petroleum companies might become less likely to commit larger resources into the development of better performing lubricants, starting with engine oils but inevitably affecting the rest of lubricant product portfolio. Switching investment priorities in large companies might reduce basestock selection, additive availability and technological intensity, which would increase the role of independent lubricant manufacturers. Until recently, when considering face-to-face competition with large companies, the smaller players would not necessarily dedicate major expenses towards engine testing, hydraulic pump stands or other costly application trials. However, with ongoing transformations in lubricant industry, the independent manufacturers often see new possibilities to develop better products. In those cases they need to demonstrate that newly developed engine oils, hydraulic fluids and many other types of lubricants have better service life and durability without running the costly trials.
Therefore, thin film degradation tests can be a useful method in giving the competitive advantage for lubricant formulators, focused on specific application as well as lubricant users, who need to screen many competing products.
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.116 page 6
Acknowledgments Research to substantiate this article was performed by FTMC Tribology Laboratory scientists Dr. Dalia Bražinskienė and Dr. Antanas Strakšys, as shown in References. Discussions with Dr. Sergio de Rooy (Shell Global Solutions) were very helpful in defining the research objectives. Technical advice, field assessments and lubricant samples from Dr. Morten Henneberg (
C.C.Jensen A/S) and Mr. Donatas Lapinskas (BM Energy Service S.i.a.) were essential and deeply appreciated.
References [1] Cvitkovic, E.E.E.F., Klaus, E.E., Lockwood, F. “A thin-film test for measurement of the oxidation and evaporation of ester-type lubricants.” ASLE Trans, 22 (4), 1979, 395-401.
[2] Asadauskas, S.J., Grigucevičienė, A., Leinartas, K., Bražinskienė, D. “Application of three-electrode electrolytic cell to evaluate thin films of vegetable and mineral oils.” Trib. Int. 44 (5), 2011, 557-564.
[3] Stoncius, A., Liascukiene, I., Jankauskas, S., Asadauskas S., “Volatiles from Thin Film Degradation of Bio-based, Synthetic and Mineral Basestocks” Ind. Lub. & Trib., 65 (3), 2013, 209-215.
[4] Bražinskienė, D., Liaščukienė, I., Stončius, A., Asadauskas, S.J., “Ester Basestock Vaporisation from Thin Oil Films” Lub. Sci., in print, DOI: 10.1002/ ls.1372, 2017, pp 1-17.
[5] Asadauskas, S., Erhan, S.Z., Perez, J.M., “Kinetics of Oxidative Degradation: Applicability of Time and Temperature Superposition”, Trib. Trans., 42 (4), 1999, 860-866.
[6] Bražinskienė, D., Asadauskas, S., Lapinskas, D., “Thin film degradation testing of lubricants for gas generator, diesel engine and hydraulic applications”, Proc. “Chemistry & Chemical Technology 2017” Int. Conf. Lithuanian Soc. Chemistry, ISBN 2538-7359, pg 21, KTU, Kaunas, 28 April 2017.
[7] Asadauskas, S. J. “From heavy duty lubricants to biobased fluids–legacy of Joseph Perez.” Green Tribology, 1 (1), 2018, 1-4.
LINK
www.ftmc.lt
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