Abstract: A high temperature antioxidant,alkylated N-phenyl-α-naphthylamine,was successfully synthesized in laboratory. The structure and purity of the antioxidant were characterized by IR,MS and GC. The oxidation resistance of the antioxidant in base oil was investigated by means of pressure differential scanning calorimetry (PDSC) and oven oxidation method. The antioxidant performance in aviation engine oil and SM specification gasoline engine oil was also evaluated. The results show that alkylated N-phenyl-α-naphthylamine has higher thermal decomposition temperature and oxidation stability, compared with the conventional antioxidant, which can meet the requirement of antioxidants in high temperature environment.

Key words: lubricating oil, antioxidant, oxidation stability, amine type, aviation engine oil