Abstract: Based on the ASTM D7169 standard method, this paper employs high-temperature simulated distillation to determine the components of poly-α-olefin (PAO) synthetic oil with different viscosities, enabling accurate acquisition of component distribution and content. This method utilizes polymeric wax and n-alkanes as retention time calibration standards for simulated distillation, effectively clarifying the composition and degree of polymerization of the samples. Meanwhile, the response factor was determined through the analysis of reference samples, allowing for further acquisition of sample recovery rate and recovery temperature, thereby achieving precise calculation of the mass percentage of each component. This analytical method demonstrates good accuracy and repeatability. Compared with conventional gas chromatography-mass spectrometry method, which can only analyze the components and content of PAO oligomers, high-temperature simulated distillation also enables the simultaneous determination of the content and boiling point of PAO polymers, providing crucial technical support for in-depth investigation of PAO properties.

Key words: high-temperature simulated distillation, poly-α-olefin synthetic oil, component analysis, boiling range distribution