Abstract: The performances of novel dibutyl dithiocarbamate (ADMC) in mineral base oil are investigated comparing with the same type of additives. The results show that ADMC exhibits good oil solubility, tribological properties, and corrosion resistance. Meanwhile, the thermal oxidation stability of ADMC and p,p-dioctylphenylamine (DODPA) in Poly-a-olefin synthetic base oil is evaluated by pressure differential scanning calorimetry (PDSC). The results show that DODPA possess better antioxidant properties than ADMC, the initial oxidation temperature and extends oxidation induction time of PAO containing DODPA are improved obviously when ADMC was combined with DODPA. Accordingly, they exhibit good antioxidant synergistic effects.

Key words: dibutyl dithiocarbamate, p,p-dioctylphenylamine, antioxidant, synergistic effects