HIGH TEMPERATURE OXIDATION INHIBITION OF ALUMINUM COMPLEX SOAP GREASE.
ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV
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The aluminum complex soap greases made previously see AD-610 560 had good high and low temperature shear properties and good oxidation stability at 210F but at 250F were deficient in the latter property. Efforts to correct this deficiency consisted of incorporating antioxidants which had proved effective at the higher temperature in other grease types. The antioxidants were generally less effective at 250F in these aluminum base greases than they were in other greases at the same temperature. Two of the inhibitors, 2,4-diisopropyl amino diphenyl ether and a proprietary mixture of complex organic amines, did impart superior resistance to oxidation at 250F. The former, in a one percent concentration, limited the pressure drop to 25 psi in 400 hours and a 27 psi drop in 400 hours was recorded using the latter material in a 0.3 percent concentration. This work shows that it will be difficult to find antioxidants for limiting the pressure drop of aluminum complex soap grease to 20 psi in 400 hours at 250F. Author
- Lubricants and Hydraulic Fluids