Time-Temperature Studies of High Temperature Deterioration Phenomenon in Lubricant Systems: Synthetic Ester Lubricants.
Annual rept. 1 Oct 77-30 Sep 78,
FORD MOTOR CO DEARBORN MICH
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A study of the lengths of the inhibition periods caused by the addition of varying amounts of the bisphenol antioxidant, 4,4-methylenebis 2,6-di-tertbutylphenol, BPH, on the autoxidation of pentaerythrityl tetraheptanoate, PETH, in a batch reactor at 180, 200 and 220C has been carried out. A kinetic analysis based upon these results together with preliminary results on the BPH decay and quinone methide product formation as a function of time yield a general equation for the rate of decay of BPH. A study of wear rates at 100C manifested by pure PETH and by slightly oxidized PETH has been completed. At one ca. 2 oxidation the wear rate is increased by a factor of 8 over that of pure PETH. This result together with those from various ancillary studies are consistent with the view that hydroperoxides, perhaps in combination with alpha,gamma-substituted difunctional oxidation products, lead to a rapid corrosive wear phenomena. Author
- Physical Chemistry
- Lubricants and Hydraulic Fluids