苯并三氮唑/β-环糊精超分子缓蚀剂的制备及性能研究

Preparation and analysis of a benzotriazole/β-cyclodextrin supramolecular inhibitor

利用β-环糊精(β-CD)外端亲水,内部空腔疏水的分子结构特征,通过饱和溶液法,以β-CD为主体,苯并三氮唑(BTAH)为客体,制备了物质的量比1∶1的超分子结构包合物。利用二维核磁共振氢谱(2D-NMR)、傅立叶变化红外光谱(FT-IR)、X射线衍射(XRD)等对产物的结构进行表征,结果表明,作为客体的BTAH分子已存在于环糊精的疏水空腔内,客体分子通过氢键与主体相互作用,形成超分子结构;原本具有良好结晶性的β-CD与BTAH经过超分子化后,形成了一种全新的物相。根据相溶解度的测定结果,可推断所制备产物的主客体物质的量比为1∶1,增溶效果明显。利用重量法与电化学法等手段,考察了所制备产物在模拟循环冷却水中对紫铜的缓蚀性能,结果表明40℃下,加入60 mg/L超分子缓蚀剂后,对紫铜的缓蚀率可达92.3%。

A supramolecular complex has been prepared using a saturated solution method. Benzotriazole( BTAH)was selected as the guest compound,whilst β-cyclodextrin( β-CD) was selected as the host compound based on its special molecular structure which is hydrophilic on its outside but hydrophobic in the internal cavity. The structure of the complex was characterized by 2D proton nuclear magnetic resonance spectroscopy( 2D-NMR),Fourier transform infrared( FT-IR) spectroscopy and X ray diffraction( XRD). 2D-NMR showed a correlation peak between the protons in the cavity of β-CD and the protons of the benzene rings of BTAH,indicating that BTAH has been successfully incorporated in the internal cavity of β-CD. FT-IR illustrated that BTAH was connected to β-CD via hydrogen bonds. Analysis by XRD and scanning electron microscopy( SEM) showed that an entirely new phase had been obtained. According to phase solubility diagrams,the stoichiometric ratio of the supramolecular complex based on BTAH was fixed at 1 /1,showing that β-CD had a solubilizing effect on BTAH. Application of the product in anti-corrosion protection of copper in a circulating cooling water system was investigated by the method of weight-loss and electrochemical tests. The results showed that at a temperature of 40 ℃,the corrosion inhibition ratio was92. 3% when adding 60 mg / L of the supramolecular inhibitor.