油酸基咪唑啉类缓蚀剂的合成及其缓蚀性能评价

Synthesis and performance evaluation of oleic acid-imidazoline corrosion inhibitors

以油酸与三乙烯四胺或四乙烯五胺为原料、甲苯为携水剂,控制不同的酸胺摩尔比,合成出一系列单环或双环油酸基咪唑啉类缓蚀剂,通过元素分析法和红外光谱法对产品进行了结构表征,并利用静态失重法考察了咪唑啉环数对缓蚀剂缓蚀性能的影响。结果表明,当酸胺摩尔比为1.0∶1.1时,反应产物为单环咪唑啉衍生物;当酸胺摩尔比为2.0∶1.1时,形成双环咪唑啉衍生物;用油酸与四乙烯五胺摩尔比为1.0∶1.1合成的单环油酸基咪唑啉作缓蚀剂,当其添加量为6 mg/L时,缓蚀率可达99%以上。

A series of oleic acid - imidazoline corrosion inhibitors with single or double ring were synthesized from oleic acid and triethylenetetramine or tetraethylenepentamine using toluene as water entraining agent,and controlling different mol ratio of acid to amine. The molecular structure of the products were characterized by elementary analysis and infrared spectroscopy. And the effect of ring number in imidazolines on the corrosion -inhibiting performance was investigated by static mass -loss method. The results showed that the corrosion inhibitors with single mole or double ring could be ratio of acid to amine synthesized as the was 1.0：1.1 or 2.0： 1.0, respectively. The corrosion inhibiting rate was more than 99% for the inhibitor synthesized with mole ratio of acid to amine of 1.0：1.1 when its adding level was 6 mg/L.