菜籽油直接胺解法制备咪唑啉衍生物的缓蚀性能研究

为了降低原料成本,减少三废污染,以菜籽油和羟乙基乙二胺为原料,采用潜溶剂法合成咪唑啉中间体IM-1,再分别与氯化苄和氨基磺酸进行改性,得到阳离子咪唑啉衍生物IM-2和两性咪唑啉衍生物IM-3。应用红外光谱和核磁共振氢谱对合成产物进行鉴定。从中优选出1种与助剂KI(20∶1)复配,得到复配缓蚀体系IM-4。利用挂片法评价了该复配体系IM-4的缓蚀性能,并探究了其在A3钢表面的成膜性能。利用扫描电镜观察了加入IM-4前后A3钢的表面形貌,并与常用缓蚀剂进行了缓蚀性能的比较。结果表明,该缓蚀体系IM-4在盐酸溶液中对A3钢具有较强的缓蚀性能,静态缓蚀率为88.62%~98.98%,动态缓蚀率为86.76%~95.85%。

Preparation of imidazoline derivatives from rapeseed oil by way of direct aminolysis and its inhibition behavior

The paper intends to introduce a new method of preparing imidazoline derivatives from rapeseed oil by way of direct aminolysis and its inhibition behavior.As is known,imidazoline derivative is a kind of environment-friendly corrosion-inhibitors,widely used in rust-removing of metal pickling,descaling by acid pickling of industrial equipment and technology for acidulating oil extraction.In hoping to reduce the cost of raw materials and reduce the environmental pollution,this paper would like to introduce a new approach to synthesizing imidazoline intermediate(IM-1) by solvent method with rapeseed oil and 2-(aminoethylamino) ethanol.And next,we have modified the IM-1 by adding benzyl chloride and sulfamic acid to obtain cationic and amphoteric derivate IM-2 and IM-3,respectively.When the improved products were analyzed with IR spectrum and HNMR spectrum,it would be possible to select optimal inhibitor from the two said products by way of static weight-loss measurement.And then the amphoteric derivative IM-3 can also be selected out of the original product through the following tests.Since the addition of inorganic anions I-can help to raise the corrosion inhibition efficiency,it would be possible to gain finally a complex system(IM-4) through selecting from and mixing them with KI(20:1).Its inhibition behavior can be evaluated by static weight-loss measurement and dynamic weight-loss measurement.And,now,we can explore the film-forming behavior on the surface of A3 steel in different concentrations and different times with the newly prepared inhibitor IM-4.Afterwards,we can apply the scanning electron microscope to the investigation of the shape patterns on the surface of A3 steel in hydrochloric acid before and after the corrosion.Comparing IM-4 with other common inhibitors,such as thiourea and hexamethylenetetramine in inhibiting behavior,we can get the results that the IM-4 has stronger corrosion inhibiting ability than other kinds of inhibitors for A3 carbon steel in hydrochloric acid,with the best time of film-coating being 4 h and the optimal concentration of IM-4—100 mg/L.Its static corrosion inhibition efficiency can be made to reach 88.62%-98.98% while the dynamic corrosion inhibition efficiency can be made as high as to 86.76%-95.85% in hydrochloric acid.