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.

摘要： 采用旋转氧弹（RPVOT）、压力差示扫描量热仪（PDSC）和润滑油老化特性等试验方法对比了3,7-二异辛基吩噻嗪和4,4’-二异辛基二苯胺在溶剂精制基础油、加氢基础油和聚α烯烃（PAO）中的抗氧化性能，并考察了二者的复配效应，结果表明3,7-二异辛基吩噻嗪延长氧化诱导期和抑制酸值增长的能力优于其母体4,4’-二异辛基二苯胺，二者复配具有明显的协同效应，同时发现基础油的组成对抗氧剂的作用有较大的影响。