Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


Table 4. Additive performance on friction, wear and extreme pressure properties in treated lithium complex base grease.


As can be seen from Table 4, MoDDP has excellent friction and wear performance in lithium complex grease. After adding MoDDP, both the friction coefficient and four-ball wear scar diameter, have been substantially decreased, while the last nonseizure load has been increased greatly. After adding extreme pressure agents DMTD dimer and DMTD/PAG complex, extreme pressure performance of the lithium complex grease was greatly improved. Both LNSD and weld point have been increased significantly, especially the weld point. But the four- ball wear scar diameter has been increased, indicating that these DMTD derivatives are good at improving EP performance but are poor in antiwear or wear resistance.


On the other hand, it is obvious from Table 4, that combinations of MoDDP and DMTD dimer or DMTD/PAG complex, can significantly improve both extreme pressure, antiwear/friction performance simultaneously in lithium complex grease. Figure 3 and Figure 5 showed the different effects on friction reducing performance between individual additive and additive combinations. And Figure 4 and Figure 6 showed the different effects on antiwear performance between individual additive and additive combinations.


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Figure 4. Antiwear performance of MoDDP and DMTD dimer in lithium complex grease.


Figure 5. Friction reducing performance of MoDDP and DMTD/PAG complex in lithium complex grease.


Figure 3. Friction reducing performance of MoDDP and DMTD dimer in lithium complex grease.


Figure 6. Antiwear performance of MoDDP and DMTD/PAG complex in lithium complex grease.


LUBE MAGAZINE NO.126 APRIL 2015 35


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