Abstract: A high temperature antioxidant alkyl diphenylamine was synthesized in the laboratory. The anti-oxidation performance of the antioxidant in base oil was evaluated by rotating oxygen bomb and PDSC. The anti-oxidation performance of the antioxidant in full formula oil was investigated by HTCBT, TEOST 33C, ROBO, PDSC and heat pipe simulation evaluation methods. The simulation results show that the product has high thermal stability and excellent high temperature sediment inhibition ability in TEOST 33C. The results of Ⅲ H bench test show that the product has excellent performance in viscosity growth control. The ROBO process is consistent with the bench test results to a certain extent, which can be used as a method for screening antioxidants. The results of bench test and simulation test show that the antioxidant has excellent performance and can be used in high-grade lubricating oil products.

Key words: amine antioxidants, antioxidation property, MS Ⅲ H bench test, ROBO thermo-oxidation egine oil simulation test