Abstract: The accuracy and applicability of the mathematical model for viscosity blending of synthetic lubricant base oils (referred to as base oils),sourced from natural gas,with blends of other three base oils were investigated. The kinematic viscosities of the blends of synthetic base oil GTL420 with synthetic base oil PAO10, mineral base oil 500N and coal-based Fischer-Tropsch synthetic base oil CTL10 in different proportions at 40 ℃ and 100 ℃ were measured, and the viscosity blending model was optimized. The models were evaluated based on the deviation rate, root mean square error, sum of squared residuals, and correlation coefficient. The results show that the Arrhenius equation has the largest deviation rate among the three blending systems and cannot accurately describe the true kinematic viscosity of the blended base oil; the Lederer-Roegiers Sr equation and the Grunberg-Nissan equation exhibit similar simulation effects, but have different validity in different blending systems; the Oswal-Desai equation has a complex structure, but its accuracy and applicability are optimal.

Key words: natural gas, synthetic base oil, blended base oils, viscosity blending model, optimization