Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
4. Conclusions (1) DMTD extreme pressure agents, DMTD dimer and DMTD/PAG complex, exhibit excellent extreme pressure performance. Adding these EP agents to lithium complex grease, polyurea grease and calcium sulfonate complex grease can effectively improve the four-ball weld point of these greases.
(2) Molybdenum dialkyl dithiophosphate ( MoDDP) has excellent friction reducing and antiwear performance in lithium complex grease. This additive can greatly reduce wear scar diameter and friction coefficient in lithium complex grease. In calcium sulfonate complex grease, it has good extreme pressure properties (increasing the last nonseizure load and weld point in four-ball EP test), and excellent friction reducing properties. In polyurea grease, it does not show obvious extreme pressure, antiwear and anti- friction properties.
(3) When combination of molybdenum dialkyl dithiophosphate (MoDDP) and DMTD dimer or DMTD/PAG complex was used in the lithium complex grease, the treated grease exhibited excellent friction reducing, antiwear and extreme pressure properties.
(4) When combination of molybdenum dialkyl dithiophosphate (MoDDP) and DMTD/PAG complex was used in the polyurea grease, the treated grease exhibited excellent friction reducing, antiwear and extreme pressure properties.
(5) When molybdenum dialkyl dithiophosphate (MoDDP) was used in the calcium sulfonate complex grease, the treated grease achieved very high weld point, reduced wear scar diameter and lowered the coefficient of friction.
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References [1] Chen, Lihua; Zhang, Chunhui; Discussion on Function and Mechanism of Metal Deactivators. Lubrication and Seal, 2003, (1): 73-76 (in Chinese).
[2] Hoffman, D. M., Feher, J. J., Lubricating Compositions Containing 5,5’-Dithiobis (1,3,4-Thiadiazole-2-Thiol), US Patent No. 4,517,103 (1985).
[3] Karol, T., Maleic Derivatives Of 2,5-Dimercapto-1,3,4- Thiadiazoles and Lubricating Compositions Containing Same, US Patent No. 5,055,584 (1991).
[4] King, J.P., Hill, B. L., Thiadiazole Compounds and Lubricant Additives thereof US Patent No. 5,102,568 (1992).
[5] Karol, T., Polyether Glycol Derivatives Of 2,5-Dimercapto- 1,3,4-Thiadiazole, US Patent No. 5,138,065 (1992).
[6] Karol, T., Luo, R. J., Ether Derivatives Of 2,5-Dimercapto- 1,3,4-Thiadiazoles, US Patent No. 5,194,621 (1993).
[7] Karol, T., Tepper, R. J., Bis-1,3,4-Thiadiazole Compounds and Lubricating Compositions Containing Same, US Patent No. 5,849,925 (1998).
[8] Karol, T., Tepper, R. J., Thiadiazole Additives and Lubricating Compositions Containing the Same, US Patent No. 6,365,557 (2002).
[9] Karol, T., Thiadiazole Technology: Motor Oil Antiwear and Grease Extreme Pressure Additives, Technical Paper of R. T. Vanderbilt Company.
[10] Product Brochure of Vanderbilt Chemicals, LLC, 2013.
LINK
www.vanderbiltchemicals.com
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