| 摘要 |
The invention disclosed is directed to an improved ester base lubricant composition which includes minor stabilizing amounts of N-substituted phenothiazine and secondary or monoaralkyl tertiary aromatic amine. The substituent on the phenothiazine nitrogen atom is an aralkyl group which, in a preferred aspect, is (a) chloro substituted on its alkylene link, (b) ring substituted by at least one of the following: halo, nitro, alkoxy, hydroxy, and like groups, or (c) substituted both as in (a) and (b). Typically, the composition exhibits good storage stability, better cleanliness and enhanced oxidative stability in use. Also disclosed is an improved method for lubricating surfaces which provides increased effectiveness and longer service life of lubricated parts. Advantages provided by the present composition and method are observed even at elevated lubricant temperature.
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