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Lube-Tech


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.120 page 1


Long term testing of Antioxidants for Industrial Applications (Turbine) in Group I and II base oils


Joshua Jurs, PhD, Global Industrial Oil Technical Manager, Vanderbilt Chemicals LLC Executive Summary


Long term tests of various Antioxidants (AO) were evaluated in both Group I and II turbine oils. The AO packages were exposed to a long term (>5,000 Hrs) dry turbine oil stability test (TOST, ASTM D943) in the absence of water. The objective of the testing was to understand the performance of the AO systems in the formulation with Group I & II base oils and to achieve greater than 5,000 hours of service in modified (no water) D943 TOST. Samples were taken at various intervals and were tested for total acid number (TAN), viscosity change and appearance. There are some general trends that were observed with the different AO systems in the different types of bases oils (Group I vs Group II). The resulting (dry) TOST data indicated that Group II oils last significantly longer than Group I oils and with lower treat rates of the AO. The conclusions from the results indicate that a combination of dithiocarbamate (DTC) and a tolutriazole derivative (TD) seems to be the best combination for Group II oils and hindered phenol (HP) and diphenyl amine (DPA) are best for Group I oils. The best AO combination (0.31% DTC; 0.06%


26 LUBE MAGAZINE NO.149 FEBRUARY 2019


TD) for Group II oils lasted more than 10,000 hours with no precipitation, viscosity or colour change. The best AO combination for Group I Oils, 0.25% hindered phenol (HP); 0.25% alkylated diphenylamine (ADPA), also lasted in excess of 10,000 hours with no precipitation or colour change but had a slight viscosity increase. Using the correct combination of AO additives it is possible to optimise the protection of the different base oils and to achieve the same long term performance in the (dry) TOST testing of >5000 hours.


Introduction Vanderbilt’s Petroleum Application Laboratory (PAL) continuously evaluates new AO to prolong the life of Group I base fluids comparable to Group II base fluids for an industrial application (Turbine). Industrial oil formulations containing Vanderbilt AOs were subjected to a dry TOST (modified ASTM D943) for extended time and evaluated for a variety of parameters including appearance, viscosity and TAN. The various additive chemistries and performance data are examined in this article.


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