Abstract: Antioxidant nonyldiphenylamine was synthesized from nonene and diphenylamine in the presence of catalyst. The thermal stability was analyzed by differential thermal analysis (DSC) and thermogravimetric analysis (TGA), and the oxidation resistance was evaluated by rotary oxygen bomb test (RBOT), pressure differential scanning calorimetry (PDSC), thin-film oxygen uptake test (TFOUT), thermo-oxidation engine oil simulation test (TEOST) and other methods. The results show that the synthesized nonyldiphenylamine has good thermal stability and antioxidant performance, and can meet the requirements of high-grade internal combustion engine oil.

Key words: nonene, diphenylamine, alkylation, antioxidant