【Abstract】 The anti-oxidation performance of 3,7-di-iso-octyl-phenothiazine was measured in group Ⅰ,Ⅱ and Ⅳ base oils by rotating pressure vessel oxidation testing(RPVOT),pressure differential scanning calorimetry(PDSC)and aging test,and its synergistic effect with 4,4′-di-iso-octyl-diphenylamine was examined.The results indicated that 3,7-di-iso-octyl-phenothiazine showed longer oxidation induction period and lower acid number increase than 4,4′-di-iso-octyl-diphenylamine,and their notable synergistic effect was observed.It was found that the anti-oxidation characteristics of the above-mentioned antioxidants were strongly affected by the composition of the corresponding base oil.更多还原