β-二酮的合成及其在金属粘接中的应用  

Synthesis of β-diketone and its application in metal bonding

作　　者：刘倚帆 刘燕[1] 林浩[1] 刘剑[1] Liu Yifan;Liu Yan;Lin Hao;Liu Jian(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010

出　　处：《中国胶粘剂》2023年第10期36-41,共6页China Adhesives

摘　　要：以苯乙酮、庚酸乙酯为原料,乙二醇二甲醚为溶液,乙醇钠为催化剂,制备了1-苯基壬烷−1,3-二酮(记为β-二酮),用于对钢表面预处理以及处理后粘接性能的研究。研究了在有氧和无氧条件下β-二酮和铁的反应,测试了反应液中Fe3+浓度的变化、钢板表面的腐蚀情况,对使用β-二酮处理前后的钢板粘接接头进行粘接性能测试。研究结果表明:通过傅里叶变换红外光谱分析仪(FT-IR)和傅里叶数字化核磁共振仪(1HNMR)的结构表征,证明成功合成了β-二酮;电感耦合等离子体发射光谱分析证明,Fe只有被氧化成Fe3+才能与β-二酮中的氧原子形成配位键,生成螯合物;通过循环伏安测试和恒电位测试的方法,加速了β-二酮与钢板的反应速率;通过电化学的方法处理钢板2 h得到的表面腐蚀程度与在常温下处理18 h的表面相似,因此可以使用电化学处理来改善粘接性能;当β-二酮处理钢板18 h后,得到的粗糙面可以与胶粘剂形成牢固的机械互锁,粘接强度比原来提升了27.0%,达到了最高强度。1-phenylnonane-1,3-diketone(denoted asβ-diketone)was prepared by using acetophenone and ethyl heptanoate as raw materials,ethylene glycol dimethyl ether as solution,and sodium ethanol as catalyst,for the study of bonding properties with pretreatment of steel surface and after treatment.The reaction betweenβ-diketone and iron was studied under aerobic and anaerobic conditions,the changes in Fe3+concentration in the reaction solution and the corrosion on the steel plate surface were tested,and the bonding performance of the steel plate bonding joints before and after treatment withβ-diketone was tested.The research results showed thatβ-diketone was successfully synthesized by structural characterization of Fourier transform infrared spectroscopy(FT-IR)and Fourier digital nuclear magnetic resonance(1H-NMR).Inductively coupled plasma emission spectroscopy analysis showed that coordination bonds could be formed with oxygen atoms inβ-diketone after Fe was oxidized into Fe3+,forming chelates.The reaction rate betweenβ-diketone and steel plate was accelerated through cyclic voltammetry and potentio static testing methods.The surface corrosion degree obtained by electrochemical treatment of steel plate for 2 hours was similar to that obtained by treatment at room temperature for 18 hours,therefore electrochemical treatment could be used to improve bonding performance.When the steel plate was treated withβ-diketone for 18 hours,the rough surface obtained could form the strong mechanical interlock with the adhesive,the bonding strength increased by 27.0%compared to the original,reaching the highest strength.

关 键 词：Β-二酮 表面预处理 螯合物 机械互锁 粘接强度 

分 类 号：TQ430.4[化学工程]