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Lube-Tech Abstract:


The behaviour of lubricating grease in different tribological contacts has been discussed intensively for many decades. It is also known that there are a vast number of material related parameters that may have significant impact on the tribological behaviour of grease, such as type of thickener and amount, the viscosity and oil type, the concentration and type of additives. The above parameters are directly related to the cost of the formulation, however there are additional parameters that are directly related to the operational cost and conditions such as the contact pressure and the operating temperature is preferable that test equipment used for the development and optimisation of new grease formulations is limited.


The aim of this study is to investigate, step by step, how the formulation of lithium and lithium complex greases may be optimised using tribological tests. The thickeners chosen are lithium and lithium complex since more than 75 percent of global grease production is based on these two thickener systems. Furthermore, three straight cuts of mineral base oils with various viscosities (150, 375 and 600 mm2/s) and two additive packages: I) an additive package that consists of anti-oxidant, anti-wear and extreme pressure components and II) additive package I + an


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.136 page 1


The impact of viscosity of naphthenic oils and extreme- pressure additives on lubricating greases


Mehdi Fathi-Najafi, Nynas AB, SE-418 78 Gothenburg/Sweden Ameneh Schneider, Optimol Instruments Prüftechnik GmbH, Munich/Germany Jinxia Li, Nynas AB, SE-149 82 Nynäshamn/Sweden


extra dosage of the same extreme pressure additive used in package I. All the greases have been produced in a laboratory pilot plant at atmospheric pressure. Besides the state of the art characteristics of the greases, the tribological properties of all formulated greases were studied by using the new generation tribometer, SRV®


5. In the first stage, the tribological


tests were run with respect to various ASTM methods such as D5706 B, D5707, D 2266 and D2596.


The outcome suggests that by running different tribological tests under conditions very close to relevant application fields, the formulation of the grease can be optimised further resulting in a more cost-efficient solution.


1. Introduction Lubricating greases can be used in a wide range of applications and conditions. Various lubricating greases, depending on the type and amount of thickener, additives and viscosities of the base oils, provide the main parameters for complexity.


Complexity in the tribology of greases has been discussed for decades, in which the effect of thickeners on tribological performance has been at the core of many technical papers and publications.


LUBE MAGAZINE NO.165 OCTOBER 2021 29


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