Abstract: N,N-bis(methylbenzotriazole methylene) dodecylamine metal deactivator was synthesized by condensation reaction of methylbenzotriazole, dodecylamine and formaldehyde. The synthesis conditions were optimized by orthogonal design. The structure and elemental composition of the synthesized product were characterized by IR, MS and elemental analysis, and the performance of the target product was evaluated. The results showed that the yield was over 98.0% under the conditions of optimized ratio of raw material of n（methylbenzotriazole）: n (Formaldehyde) : n (alkylamine) = 2.0:2.1:1.0,anhydrous ethanol as solvent,reaction temperature of 80 ℃ and reaction time of 5 h. The relative molecular weight of the synthesized product was 475, and the element composition and molecular ion characteristic peak were consistent with N,N-bis(methylbenzotriazole methylene) dodecylamine. The corrosion inhibition of the synthetic product was excellent, the oxidation induction period was over 350 min, the base value was only about 110 mgKOH/g, the acid value was less than 2 mgKOH/g. The performance of the synthesized product was much better than that of deactivator T551, and had high thermal stability, good oil solubility and good synergistic effect with antioxidant T203 and acid antirust agent T746.

Key words: TTA, metal deactivator, oil solubility, synthesize, lubricating oil, compatibility