通过溶胶-凝胶法制得平均粒径为226 nm形状规整的球形二氧化硅微球.用硅烷偶联剂KH-570作表面处理后,使用十二烷基硫酸钠作为乳化剂,采用超声化学的方法,将纳米级二氧化硅组装包覆在三聚氰胺甲醛树脂表面,形成具有高比表面积的微米级颗粒.通过红外光谱FT-IR、扫描电子显微镜、激光粒度测试等方法对二氧化硅及组装颗粒进行表征,并对合成机理进行分析.发现二氧化硅在三聚氰胺甲醛树脂颗粒上均匀包覆,最后包覆物粒径分布较均一,平均粒径为30 μm.%Nanosized SiO2 microspheres with an average diameter of 226 ntn were synthesized by sol-gel methods. After being modified by silane coupling agent KH-570 and using sodium dodecylsulphate ( SDS) as emulsifier, nanosized SiO2 microspheres were fabricated on melamine formaldehyde with ultrasonication, which aimed at weakening the disadvantages of nanosized materials as well as remaining the merits of high specific surface area. Fourier transform infrared spectroscopy, scanning electron microscopy and the laser light scattering were used to characterize the appearance and chemical composition of the product. The mechanism of the synthesis was also analyzed. The particles have an average size of 30 fjun and distributed uniformly. The product has potential applications in reinforcing materials and other fields and it may be used as a kind of substitute material of nanosized materials to reduce their toxity in some extent.
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