硅烷偶联剂修饰高岭土的制备与表征

Preparation and Characterization of Silane Modified Kaolin

采用机械磨剥和表面化学修饰相结合的方法成功制备了超细烷基化高岭土。通过粒径测试对影响高岭土机械磨剥的因素进行分析,确定最佳磨剥条件。采用红外光谱分析仪和扫描电镜对烷基化高岭土进行表征分析。结果表明,球磨时间3h,球料比(介质球用量与浆料质量比)为5∶1,直径2mm与直径1 mm的介质球质量配比为1∶4时,磨剥效果最好。红外分析表明,硅烷偶联剂与机械磨剥高岭土发生化学反应,接枝在高岭土颗粒表面。扫描电镜显微结构观测显示,经机械磨剥-化学修饰后,高岭土颗粒仍具有良好的片状结构。

The ultrafine silane modified kaolin was prepared by the combination of machine abrasive peeling and surface modification technique. The particle size distribution of different samples was analyzed to determine the optimum milling conditions. FT-IR spectrum and scanning electron microscopy were also employed to characterize the silylated kaolin. The results show that the optimum conditions are： abrasive peeling time is 3 h; the ratio of media ball with diameter of 2 mm and 1 mm is 1 ： 4; the ratio of media bali and kaolin is 5 ： 1.The FT-IR analysis show that silane can chemically react with abrasive peeling kaolin particles and be grafted on the surface of the particles. The SEM images show that the mechanical abrasive peeling and surface chemical modification would have less failure to the shape of the kaolin particles.