机械力化学法制备硅烷接枝高岭石的研究

采用湿法研磨机械力化学法制备了硅烷接枝改性高岭石.采用X射线衍射、红外光谱、扫描电镜、物理吸附仪等对湿法研磨高岭石及硅烷表面修饰高岭石样进行表征,并通过结晶度指数、Scherrer公式等方法对样品的晶体结构尺寸大小进行计算分析. 结果表明经研磨处理高岭土颗粒比表面积增大,粒径减小,高岭石晶体结构无序性增强,堆垛体被剥离成微小高岭石片层,晶粒尺寸明显减小.相比直接改性高岭石,湿法研磨改性高岭石的红外光谱发生显著变化,出现了-CH3、-CH2、C=O 和 Si-C 键等硅烷偶联剂的红外峰.

Preparation of Silane Grafted Kaolinite by Mechanochemically

The silane grafted kaolinite was prepared by the wet milling mechanochemical technique.XRD, FT-IR, scanning electron microscopy and physical adsorption technique were employed to characterize the wet milled kaolinite and silane modified samples.The crystal structure and size were calculated according to HI index and Scherrer method.The results show that the staked kaolinite sheets are peeled into fine particle sheets by the wet milling, the crystal structure changes to much more disordered, the stacking body is stripped into tiny kaolinite layer, and the grain size is significantly reduced.Fourier transform infrared spectroscopy confirmes the existence of-CH3,-CH2-, C=O and Si-C from silane agent for the wet milling silane modified kaolinte rather than the directrly silane modified samples.