曼尼希碱的结构与其缓蚀性能的关系

摘要

利用曼尼希反应制得了曼尼希碱1-苯基-3-二乙氨基-1-丙酮（ DPO），再利用DPO和伯胺（苄胺、对甲基苯胺、苯胺）进行胺交换反应，制得了结构不同的曼尼希碱：1-苯基-3-苄氨基-1-丙酮（ BPO ）、1-苯基-3-对甲苯氨基-1-丙酮（ TPO）和1-苯基-3-苯氨基-1-丙酮（ PPO）。静态失重法和极化曲线法研究结果表明，其在15％盐酸中90℃时对N80钢的缓蚀性能大小顺序为：DPO＜BPO＜TPO＜PPO。四种曼尼希碱缓蚀剂在N80钢表面上的吸附遵循Langmuir吸附模型，吸附能力大小顺序为：DPO＜BPO＜TPO＜PPO，这说明当曼尼希碱分子中氨基与苯环形成富电子共轭体系时，其吸附能力较强，可表现出较强的缓蚀性能。%Mannich bases,3-diethylamino-1-phenylpropan-1-one (DPO),was prepared by Mannich reac-tion.Mannich bases , 3-benzylamino-1-phenylpropan-1-one ( BPO ) , 3-p-toluidino-1-phenylpropan-1-one (TPO) and 3-phenylamino-1-phenylpropan-1-one (PPO),were prepared by amine exchange reactions between DPO and primary amines ( benzylamine , p-toluidine and aniline ) .The anti-corrosion perform-ances of the four Mannich bases as inhibitors in 15%hydrochloric acid at 90℃were investigated by stat-ic gravimetric measurement and the polarization curves method .The four Mannich bases can be arranged ( in order of increasing anti-corrosion performance ):DPO