Abstract
Three Schiff's bases have been prepared as antioxidants for three grades of lubricating grease. The following Schiff's base compounds were synthesised: 3‐[(p‐chlorophenyl)iminomethylenyl]‐4‐hydroxy‐8‐methyl‐2(1H)‐quinolinone and its bromo and iodo analogues. The structures of these compounds have been confirmed using elemental analysis, nuclear magnetic resonance, and infrared spectroscopy. The quinolinone compounds were added to the lubricating greases in different concentrations. The antioxidant efficiency of these bases have been determined using infrared spectroscopy and total acid number. The results indicate that the oxidation stability of the lubricating greases is affected by the type of fatty acid they contain. It was found that the three types of grease resist oxidation in the presence of the Schiff's bases; the efficiency of these compounds as antioxidants decreases in the order: p‐chloro > p‐bromo > p‐iodo derivative. The mechanisms of operation of the quinolinone derivatives as scavengers for free radicals are suggested.
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