A novel high temperature antioxidant for ester oils was synthesized with diphenylamine and 2, 6-di-tert-butylphenol as the starting materials and di-tert-butyl peroxide as the catalyst. The composition and structure of the as-synthesized antioxidant were analyzed by gas chromatography-mass spectrometry and single crystal X-ray diffraction. The antioxidant behavior of the antioxidant was tested by rotary bomb oxygen test and pressurized differential scanning calorimetry, and its anti-oxidation mechanism was discussed. Findings show that the as-synthesized product is a mixture of amine antioxidant and hindered phenol antioxidant and it exhibits good thermal stability. As an antioxidant in ester oil like di-iso-octyl sebacate, the as-synthesized product exhibits better anti-oxidation performance than commercial antioxidants diphenylamine and 2, 6-di-tert-butylphenol; and in particular, it exhibits good anti-oxidation ability at elevated temperature. This could be because the as-synthesized product consists of amine antioxidant and hindered phenol antioxidant that have synergistic anti-oxidation ability.
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