酚类抗氧剂在润滑脂中的热稳定性及抗氧化性应用研究

Study on the Thermal Stability and Oxidation Resistance of Phenolic Antioxidant in Lubricating Grease

文章采用压力差示扫描量热法(PDSC),分别以动态法和静态法两种方式,研究了加入3种典型的酚型抗氧剂T501、L135和L115后,复合锂基润滑脂氧化安定性的改善效果;以及不同的抗氧剂含量对复合锂基脂的氧化安定性的影响。结果表明:加入这3种抗氧剂后,复合锂基脂的起始氧化温度和氧化诱导时间均有不同程度的提高,其中加入硫代双酚型抗氧剂L115的抗氧化性能最佳;酯类单酚型抗氧剂L135次之;普通单酚型抗氧剂T501最差。热重分析(TG)结果表明,3种抗氧剂分子的热稳定性也遵从这一顺序,说明抗氧剂具有较好的热稳定性有助于在油脂中发挥更好的抗氧化性能。

In this paper,the oxidation stability of lithium complex grease was measured,before and after adding three kinds of typical phenolic antioxidants T501,L135 and L115,by using the Pressure Differential Scanning Calorimetry(PDSC),dynamic and static methods respectively.And the effects of antioxidant content on the oxidation stability of lithium complex grease were also investigated.The results showed that the initial oxidation temperature and oxidation induction time of lithium complex grease are increased aft...