摘要：为获得疏水性纳米SiO2无机填料, 选用3种长链型硅烷偶联剂辛烷基、十二烷基、十六烷基三乙氧基硅烷, 在无水条件下制备疏水纳米SiO2, 利用红外光谱、透射电镜、比表面积表征产物结构, 采用润湿性、固体表面自由能、有机相容性考察产物疏水效果。结果表明:经有机化改性, 纳米SiO2颗粒由强亲水性转变为强疏水性, 团聚现象明显减弱, 表面自由能大幅降低, 与有机溶剂的相容性显著提高;通过优化工艺参数得到改性剂与纳米SiO2的最佳质量比为2∶1, 产物最大疏水角为145.36°, 并得到一种结构控制性能的“润湿调控”机制。
关键词：硅烷偶联剂；疏水；改性；润湿调控
Abstract：In order to obtain hydrophobic nano-SiO2 inorganic fillers, three kinds of long-chain silane coupling agent, octyl, dodecyl, and hexadecyl triethoxysilane were used to prepare hydrophobic nano-silica under anhydrous condition. The structure of the product was characterized by IR, TEM and BET. The hydrophobic effect of nano-sized SiO2 particles was investigated by the wettability, free surface energy of solid and organic compatibility. The results shows that after surface modification, the nano-silica particles change from strongly hydrophilic to strongly hydrophobic, the aggregation decreases obviously, the free surface energy decreases significantly, and the organic compatibility highly increases. Among them, by optimizing the process parameters, the optimum mass ratio of modifier to nano-SiO2 is 2∶1 and the maximum hydrophobic angle is 145.36%°.In addition a 'wetting regulation' mechanism of structure control performance is drew in this paper.
Keywords：silane coupling agent；hydrophobic；modification；wetting regulation
