两种润滑脂中基础油提取方法的比较

Comparison of Two Extraction Methods of Base Oil in Grease

为研究不同提取方法对锂基润滑脂中基础油提取效果的影响,采用12-羟基硬脂酸体系稠化基础油制备锂基润滑脂,然后采用石油醚提取法和压力分油提取法分别提取制备的润滑脂中的基础油,并分析2种不同方法提取的基础油与原稠化基础油在黏度、族组成、低温性能和组分构成方面的差别。结果表明:2种不同方法提取的基础油的红外谱图与稠化基础油的红外谱图基本一致,族组成和苯胺点也与稠化基础油基本一致;压力分油提取法提取的基础油的黏度、黏指、倾点和蒸发损失与稠化基础油一致;石油醚提取法提取的基础油的黏度与混合基础油中的小黏度基础油基本一致,黏指和倾点与润滑脂稠度相关,蒸发损失略大于原稠化基础油。对于润滑脂的剖析,2种方法结合使用可以得出较为准确的结果。

In order to study the effect of different extraction methods on the extraction of base oil from lithium grease,lithium grease was prepared by thickening base oil with 12-hydroxy stearic acid system,and two different methods,the method of petroleum ether extraction and the method of pressure oil separation,were used to extract the base oil from the as-prepared lithium grease.The differences of viscosity,group composition,low temperature performance and component structure between the base oils extracted by two different methods and the original thickened base oil were analyzed.The results show that the infrared spectrum of the base oil extracted by two different methods is basically the same as that of the original thickened base oil,and the group composition and aniline point are also basically the same as that of the original thickened base oil.The viscosity,viscosity index,pour point and evaporation loss of the base oil extracted by the method of pressure oil separation are in accord with original blended base oil.The viscosity of the base oil extracted by the method of petroleum ether extraction is basically the same as that of the small viscosity base oil in the blended base oil,the viscosity index and pour point are related to the consistency of the grease,and the evaporation loss is slightly greater than that of the original thickened base oil.For the analysis of lubricating grease composition,two methods can be used together to get more accurate results.