Abstract: Rosin based imidazoline was synthesized with rosin and diethylenetriamine as raw materials,sodium 3-chloro-2-hydroxy propane sulfonate as quaternization agent and polyethylene glycol 600 as phase transfer catalyst.Based upon results obtained from single factor experiments and using response surface method,the optimal synthesis conditions were determined as:reaction time,5 h;dosage of the catalyst,14% of the amount of matter of rosin based imidazoline intermediate;reaction temperature,123 ℃;n(sodium 3-chloro-2-hydroxy propane sulfonate)∶n(rosin based imidazoline intermediate),0.89∶1;m(water)∶m(isopropanol),2.14∶1.Under the above-mentioned conditions,S_N2 substitution of rosin based imidazoline intermediate could reach maximum,and the value is 12.73%.The structure of rosin based imidazoline was characterized by FT-IR and ¹³C NMR under the optimum conditions,and the corrosion inhibition performance of the product were measured.The results showed that when a steel sample that is dipped in 15% mass fraction hydrochloric acid under 30 ℃ for 48 h,with 0.6% mass fraction of rosin based imidazoline as corrosion inhibitor the corrosion inhibition rate of the steel sample could reach 84.79%.

Key words: rosin based imidazoline, response surface method, corrosion inhibition performance