新型双子咪唑啉季铵盐缓蚀剂的合成及其性能

Synthesis of a Kind of Novel Gemini Imidazoline Quaternary Ammonium Salt Corrosion Inhibitor and Evaluation of Its Inhibiting Performance

为寻找性能优异的咪唑啉类缓蚀剂,以油酸与二乙烯三胺为原料、二甲苯为携水剂,制备了油酸咪唑啉(OAC),以环氧氯丙烷与二乙胺季铵化反应生成浅黄色混合物中间体,再与OAC反应,合成了一种新型双子咪唑啉季铵盐缓蚀剂(EOAC)。用红外光谱对其结构进行分析,并用静态腐蚀法考察了EOAC和OAC在不同浓度HCl溶液中对Q235钢的缓蚀率,用接触角测定仪测定了分别含有EOAC和OAC的水与Q235钢的接触角。结果表明:低酸度环境中EOAC较OAC缓蚀性能有所提高,浸润性更好,能更快在钢铁表面铺展成膜。

Oleic acid and diethylenetriamine were adopted as the starting materials to synthesize oleate imidazoline corrosion inhibitor (denoted as OAC) in the presence of dimethylbenzene as the water-carrier. Resultant OAC was then allowed to react with the mixed light-yellow intermediate obtained by the quaternization of epoxy chloropropane and diethylamine, yielding a novel gemini imidazoline quaternary ammonium salt corrosion inhibitor (denoted as EOAC). The structure of as-obtained EOAC was analyzed by means of infrared spectrometry, and the corrosion inhibition performance of EOAC and OAC for Q235 steel in the aqueous solutions of HCl with different concentrations was evaluated by static corrosion tests. Moreover, the contact angles of water separately containing EOAC and OAC on Q235 steel were measured. It was found that, under environment of low acidity, EOAC showed better corrosion inhibition performance and wetting behavior than OAC, and the former was also able to well spread on the surface of iron and steel to form wetting films.