2-硫醇基甲基苯并咪唑锌制备及其光谱分析

摘要

In the study,zinc methyl mercaptobenzimidazole (MMBZ)was synthesized by one-step method.MMBZ was detecued and characterized by FTIR,UV-Vis,XRD,TG-DSC.Its micro-structure and intrinsic regularity were revealed.Chemical bond types into MMBZ molecule were revealed by FTIR.The final product was determined MMBZ.There absorption peaks were detected by UV-Vis at 219.6,245.5,302.2 nm respectively,due to n→σ∗,π→π∗,π→π∗ electronic transitions,led by S—C, benzene and five element heterocyclic in MMBZ molecule.It could provide experimental basis with enterprise to test MMBZ product quality and speculate its structure.It was shown that MMB was a ligand of MMBZ,and its basic structure of MMB was retained still by XRD spectra.The structure of MMBZ molecule was amorphous.Two kinds of information were detected with TG-DSC as quality change and thermal effect.There were five absorption peaks of 67.5,155.3,253.7,324.8,391.3 ℃,due to impurity solvent decomposition peak,phase transition peak and decomposition of MMBZ respectively.The scheme of one step preparation of composite environment-friendly rubber antioxidant MMBZ was feasible.The structure of MMBZ could be specula-ted by results of its detecting.It could provide the basis of experimental data on association MMBZ performance,exploring its anti-aging mechanism and extending the scope of MMBZ application.%采用一步法制备出2-硫醇基甲基苯并咪唑锌(MMBZ),通过 FTIR,UV-Vis,XRD,TG-DSC 对其进行检测和表征,揭示出 MMBZ的微观结构和内在规律性。FTIR揭示了 MMBZ分子内部的各元素之间的化学键键型,确定最终产物为 MMBZ。UV-Vis检测出 MMBZ在219.6,245.5和302.2 nm有三个吸收峰,分别为 MMBZ分子中 S—C、苯环、含 N 五元杂环的n→σ∗,π→π∗,π→π∗的电子跃迁产生的,为企业MMBZ产品质量检测,推测 MMBZ的结构提供实验依据。XRD谱图发现 MMB作为 MMBZ 的配体,仍然保留其单元基本结构,MMBZ分子呈非晶态结构。TG-TG-DSC检测出 MMBZ 的质量变化与热效应两种信息,在167.5,155.3,253.7,324.8,391.3℃吸热峰,分别为杂质溶剂分解峰、相变峰、分解峰。一步法制备环保复合型橡胶防老剂 MMBZ,方案切实可行,本研究通过检测结果推测MMBZ结构,关联MMBZ的性能,探究其防橡胶老化机理,开拓 MMBZ应用范围,提供基础实验数据。