Abstract: In order to overcome the deficiency of fatty acid type diesel anti-wear agent, a kind of succinic acid monoester diesel anti-wear agent was synthesized by esterification reaction of succinic anhydride and 7-octene-1-alcohol. The reaction parameters such as feed ratio, reaction temperature and reaction time were optimized, and the best synthesis process was obtained. The structure and lubrication anti-wear performance of the synthesized products were characterized by infrared spectroscopy and high-frequency reciprocating test. The results showed that when the mass fraction of the additive was only 150 μg/g, it could meet the anti-wear requirements of diesel (the diameter of wear spot of steel ball in high frequency reciprocating test is no more than 420 μm), and the additive dosage was 40% lower than that of fatty acid type anti-wear agent. Moreover, the synthetic succinic acid monoester as diesel anti-wear agent had little effect on other physical and chemical properties of diesel, and the quality of diesel could meet the China VI standard.

Key words: diesel, anti-wear agent, lubricity, ester group, fatty acid