Tree imidazoline quaternary ammonium salt corrosion inhibitor and preparation method thereof

Abstract

The invention provides a tree imidazoline quaternary ammonium salt corrosion inhibitor and a preparation method thereof. The preparation method comprises the following steps of: (1) stirring ethylenediamine and methyl acrylate in a solvent methanol for reaction at the temperature of 25 DEG C for 24 hours, and distilling under reduced pressure to obtain 0.5-generation (G) PAMAM; (2) stirring the 0.5-G PAMAM and polyamine in the solvent methanol for reaction at the temperature of 25 DEG C for 24 hours, and distilling under reduced pressure to obtain 1.0-G PAMAM; (3) mixing fatty acid, the 1.0-GPAMAM and a water carrying agent, controlling the temperature to be between 140 and 160 DEG C, reacting for 2 hours, and raising the temperature to 190 DEG C for cyclization reaction for 3 hours to obtain a tree imidazoline intermediate; and (4) stirring at the temperature of 90 DEG C, adding the imidazoline intermediate and quaternization reagent in a molar ratio of 1:1 and reacting for 3 hours to obtain the tree imidazoline quaternary ammonium salt corrosion inhibitor. The corrosion inhibitor synthesized by the invention contains a plurality of imidazoline rings; and the corrosion inhibition rate is as high as 95.96 percent, which is much higher than the corrosion inhibition rate of 80 percent of the traditional corrosion inhibitor.

Description

【Technical field】 [0001] The invention relates to an imidazoline corrosion inhibitor and a preparation method thereof, in particular to a dendritic imidazoline quaternary ammonium salt corrosion inhibitor and a preparation method thereof. 【Background technique】 [0002] In recent years, imidazoline compounds are one of the fastest-growing organic corrosion inhibitors. Its molecular structure contains a nitrogen five-membered heterocyclic ring. Form a monomolecular film on the metal surface, change the oxidation-reduction potential of hydrogen ions, and achieve the purpose of corrosion inhibition. [0003] At present, domestic reports on imidazoline include: [0004] Wang Jianhua, Shu Fuchang, etc. used diethylenetriamine, triethylenetetramine, polyethylenepolyamine, oleic acid, benzyl chloride, chloroacetic acid, absolute ethanol, etc. as raw materials to synthesize a series of imidazoline derivative corrosion inhibitors. [0005] Zhu Xun, Zhou Xiuqin and others synthesize...

AI Technical Summary

Problems solved by technology

[0008] Although the above-mentioned imidazoline compounds have a certain effect on metal corrosion prevention, their corrosion inhibition efficiency is not very high, generally around 80%, and their water solubility is not very good, which hinders the application of imidazoline corrosion inhibitors. great influence

Images