Abstract: The preparation method of super overbased calcium salicylate was introduced. The effect of additives on the product yield was studied by using co-surfactants and co-promoters. The results showed that with the increase of the amount of co-surfactant, the yield of the product increased gradually and reached a balance; the addition of co-surfactants such as stearic acid, alkyl benzenesulfonic acid and dodecylphenol significantly improved the yield of the product. In the co-promoters, acetic acid was the most effective co-promoter and the yield was the highest when the dosage (w) was 1.5%. Result showed that when co-surfactant used together with the acetic acid the product yield was higher than both the yields when used alone. Among them, the effects of stearic acid and acetic acid combination was the best, with the product yield as high as 98%. The prepared super overbased calcium salicylate has low viscosity, good compatibility with sulfonate and excellent comprehensive performance.

Key words: super overbased calcium salicylate, co-surfactant, co-promoter, yield