化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
1期
178-182,252
,共6页
硅烷偶联剂%蒙脱土%阳离子交换容量%分散性
硅烷偶聯劑%矇脫土%暘離子交換容量%分散性
규완우련제%몽탈토%양리자교환용량%분산성
silane coupling agent%montmorillonite%cation exchange capacity%dispersibility
用单官能团硅烷偶联剂γ-氨丙基二甲基乙氧基硅烷（APMS）修饰蒙脱土（MMT）， IR 分析表明APMS通过化学键与蒙脱土键合。利用偶联剂上的氨基与水杨醛显色生成黄色希夫碱对404 nm处可见光的吸收特性进行定量测试，确定了蒙脱土可和偶联剂反应的活性硅羟基数目为29.6 mmol/(100gMMT)，最佳烘干温度为120℃。XRD 结果说明蒙脱土的活性硅羟基分布在其端面不是在层间。推断出蒙脱土和单官能团硅烷偶联剂的反应分两步进行：偶联剂的烷氧基先在水醇溶液中水解生成硅醇，然后和蒙脱土端面上的硅羟基高温干燥脱水形成硅烷化蒙脱土。偶联剂修饰蒙脱土后其阳离子交换容量（CEC）不变，分散性实验显示硅烷化蒙脱土在水中的分散性变差，在甲苯和乙醇中的分散性提高，说明偶联剂的修饰提高了MMT在有机溶剂中的分散性。
用單官能糰硅烷偶聯劑γ-氨丙基二甲基乙氧基硅烷（APMS）脩飾矇脫土（MMT）， IR 分析錶明APMS通過化學鍵與矇脫土鍵閤。利用偶聯劑上的氨基與水楊醛顯色生成黃色希伕堿對404 nm處可見光的吸收特性進行定量測試，確定瞭矇脫土可和偶聯劑反應的活性硅羥基數目為29.6 mmol/(100gMMT)，最佳烘榦溫度為120℃。XRD 結果說明矇脫土的活性硅羥基分佈在其耑麵不是在層間。推斷齣矇脫土和單官能糰硅烷偶聯劑的反應分兩步進行：偶聯劑的烷氧基先在水醇溶液中水解生成硅醇，然後和矇脫土耑麵上的硅羥基高溫榦燥脫水形成硅烷化矇脫土。偶聯劑脩飾矇脫土後其暘離子交換容量（CEC）不變，分散性實驗顯示硅烷化矇脫土在水中的分散性變差，在甲苯和乙醇中的分散性提高，說明偶聯劑的脩飾提高瞭MMT在有機溶劑中的分散性。
용단관능단규완우련제γ-안병기이갑기을양기규완（APMS）수식몽탈토（MMT）， IR 분석표명APMS통과화학건여몽탈토건합。이용우련제상적안기여수양철현색생성황색희부감대404 nm처가견광적흡수특성진행정량측시，학정료몽탈토가화우련제반응적활성규간기수목위29.6 mmol/(100gMMT)，최가홍간온도위120℃。XRD 결과설명몽탈토적활성규간기분포재기단면불시재층간。추단출몽탈토화단관능단규완우련제적반응분량보진행：우련제적완양기선재수순용액중수해생성규순，연후화몽탈토단면상적규간기고온간조탈수형성규완화몽탈토。우련제수식몽탈토후기양리자교환용량（CEC）불변，분산성실험현시규완화몽탈토재수중적분산성변차，재갑분화을순중적분산성제고，설명우련제적수식제고료MMT재유궤용제중적분산성。
Montmorillonite was modified with mono-functionalγ-aminopropyl dimethyl ethoxymsilane. Presence of chemical bond between montmorillonite and coupling agent was testified by infrared spectroscopy (IR) characterization. A yellow salicylaldimine Schiff’s base which absorbed visible light at 404nm was formed by reaction of salicylaldehyde with amino silane,therefore this specific chromogenic reaction could be used to evaluate reaction ratio of the silane coupling agent. Quantity of active silanols on montmorillonite was 29.6 mmol/(100g MMT),and the best drying temperature of silylation reaction was 120 ℃ through the above method. X-ray wide angle diffraction (XRD) test showed that active silanols were distributed on the broken edge rather than on the interlayer of montmorillonite. Reaction of montmorillonite with mono-functional silane coupling agent included two basic steps:first,the alkoxy group of coupling agent was hydrolyzed and silanol was generated in aqueous alcohol solution,then dehydration occurred to form silylated-montmorillonite between the silanol mentioned above and silanol distributed on the edge of montmorillonite at a high drying temperature. Cation exchange capacity (CEC) of montmorillonites kept the same as original montmorillonite after modification by coupling agent. Dispersion results in different solvents showed that the dispersibility of MMT was decreased in water,but was improved in toluene and ethanol. Accordingly the dispersibility of MMT in organic solvent could be increased after silanization by coupling agent.
