The antioxidation properties of methylene bis(di-n-butyldithiocarbamate) (V 7723) - and tolutriazole derivative (V 887) - containing poly-a-olefin (PAO)-derived lubricants were evaluated by differential scanning calorimetry (DSC) and modified penn state micro-oxidation test (PMOT). DSC test measures incipient oxidation temperature (OT) and oxidation induction time (IT) of the lubricant at high temperatures and the oxidation stability of oil weight loss is measured by PMOT test. DSC test shows that OT and IT of V 7723-containing PAO were improved significantly by V 887 addition. PMOT test indicates that when combining with V 7723 antioxidants, V 887 can also effectively reduce the increase in weight loss of PAO. In addition, FTIR results from PMOT test confirm that addition of V 887 can significantly enhance the oxidation induction time of oils. These results suggest that the V 7723 shows a good oxidative synergism with V 887 antioxidant.

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