合成烃类航空润滑油高温金属催化氧化研究

RESEARCH ON PROPERTIES OF SYNTHETIC AVIATION LUBRICANT AFTER HIGH TEMPERATURE OXIDATION CATALYZED BY METALS

利用高温氧化加速实验装置,以金属Cu、Fe作催化剂,研究合成烃类航空润滑油在温度为180,200,230,250,300℃条件下的氧化反应,测定反应后油品的运动黏度、酸值及倾点,并结合二元相关方法计算三者间的相关系数,利用GC/MS对其组成进行分析。结果表明:油品的运动黏度与酸值、运动黏度与倾点的关系为高度负相关性,酸值与倾点的关系为高度正相关性;正构烷烃、异构烷烃、烯烃以及其它化合物的相对含量与氧化后油品的酸值及倾点的变化具有高度正相关性,但与运动黏度的变化呈高度负相关性;己二酸二异辛酯及抗氧剂的相对含量与氧化后油品的酸值及倾点的变化具有高度的负相关性,而与运动黏度的变化呈高度正相关性。

Synthetic hydrocarbon aviation lubricating oil was oxidized at different temperatures(180℃,200℃,230℃,250℃,and 300℃)with metals Cu and Fe as catalysts in a high temperature oxidation accelerator.The kinematic viscosity,acid value and pour point of the oil after reaction were measured,and the correlation coefficient between the three was calculated by the binary correlation method.The compositions of oxygenated oils were analyzed by GC MS.Three rules are found:(i)highly negative correlations between kinematic viscosity and acid value,kinematic viscosity and pour point;highly positive correlation between acid value and pour point;(ii)highly positive correlation between relative contents of n-alkanes,i-paraffins,olefins and other compounds and changes of the acid value and pour point after oxidation,but highly negatively correlated with the change of kinematic viscosity;and(iii)highly negative correlation between the relative contents of DIOA and antioxidants and the changes of the acid value and pour point of the oil after oxidation,but highly positively correlated with the change of kinematic viscosity.