非硫磷有机钛酸酯的合成及其抗氧协同性能研究

Synthesis and Antioxidant Synergistic Properties of Sulfur-and Phosphorus-free Organic Titanate

摘要:

以油酸和钛酸四异丙基酯为原料，合成了三种非硫磷有机钛酸酯（TAE），用红外光谱对其结构进行了表征，分别采用差示扫描量热法和旋转氧弹试验考察了TAE在聚--烯烃（PAO）基础油中的热氧化安定性，并研究了其与p,p-二异辛基二苯胺（DODPA）的抗氧协同性能。结果表明，TAE自身不具有抗氧性能，但与DODPA复配后，可明显提高PAO基础油的起始氧化温度和氧化诱导时间，表现出了良好的抗氧协同效应，尤其0.75 %DODPA与0.25 %TAE复配时，协同效果最好，可使PAO基础油的氧化诱导时间增加6倍多。最后，通过红外光谱分析讨论了两种添加剂的协同作用机理。

Abstract:

Three kinds of sulfur-and phosphorus-free organic titanate(TAE) were synthesized via oleic acid and titanium isopropoxide. Their structures were characterized by infrared spectrum. The thermal oxidative stability of organic titanium compounds and the antioxidant synergistic properties of TAE and p,p’-dioctyldiphenylamine (DODPA) were evaluated by differential scanning calorimetry and rotating bomb oxidation test. The results show that TAE can not improve the antioxidant properties of Poly-α-olefin (PAO), when it was combined with DODPA, the initial oxidation temperature and oxidation induction time of PAO were enhanced significantly. Especially, when 0.25 %TAE was combined with 0.75 %DODPA, the oxidation induction time of PAO base oil can be increased by more than 6 times, which showed best synergistic antioxidation performances. Finally, synergy mechanism of the two additives was discussed by infrared spectrum analysis.