The oxidation
stability of lubricating oil has a critical influence on the oil performance
during service. In this paper, dibenzyl-S-phenyl thioglyconitrile and other derivatives were prepared by phase transfer catalysts and
investigated as antioxidants. These compounds were added to oil in different
concentrations. The antioxidants activities of different dosages were evaluated
and the mechanism was suggested according to micelle and its
thermodynamics. The oxidation of the oil has been carried out at different time intervals. The degradation of the oil has been monitored by total acid formation.
Oxidation stability of lube oil was largely affected by sulphur and concentration of aromatic hydrocarbons in oil, with the increased sulphur content
increasing oxidation stability. The prepared compounds gave higher oxidation stability
than imported compound (IRCANOX L 135-CIBA).
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