抗氧剂对复合磺酸钙基润滑脂氧化安定性的高压差示扫描量热法研究

利用高压差示扫描量热法(PDSC)研究了典型抗氧剂T501(2,6-二叔丁基对甲基苯酚)、L135(高分子量液体酚)、L57(辛基/戊基二苯胺)和T531(N-苯基-α萘胺)对复合磺酸钙基润滑脂氧化安定性的影响,考察了抗氧剂浓度对抗氧化效果的影响。结果表明,PDSC是一种快速简便评价润滑脂氧化安定性的方法,适用于抗氧剂的筛选。与传统的旋转氧弹氧化法相比较而言,PDSC的评价结果更科学,更具有规律性。另外,根据阿仑尼乌斯公式计算了润滑脂氧化反应的表观活化能。

Study on the Influence of Anti-oxidants on Oxidation Stability of the Calcium Sulfonate Complex Grease by Using Pressure Differential Scanning Calorimetry

Pressure differential scanning calorimetry(PDSC)was used to evaluate the effect of several anti-oxidants such as T501(2,6-ditert-butyl-4-methyl phenol),L135(high molecular weight liquid phenol),L57(octyl/amyl diphenylamine)and T531(N-phenyl-α-naphthylamine)on the oxidation stability of calcium sulfonate complex grease.The results showed that PDSC was a simple and rapid method for testing the oxidation of grease,and suitable for screening anti-oxidants.Compared with traditional oxygen bomb oxidation method,the evaluation result of PDSC provided a better scientific foundation and better regularity.In addition,the active energies of grease oxidation were calculated by using Arrhenius-equation.