大颗粒、高浓度硅溶胶的制备新方法  

Novel Preparation Method of Large Particle Size, High Concentration Silica Sol

作　　者：许念强[1] 顾建祥[1] 罗康[1] 郑松保[1] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800

出　　处：《化工进展》2005年第8期925-929,共5页Chemical Industry and Engineering Progress

摘　　要：以水玻璃为原料,采用滴加工艺制备一定粒径大小的二氧化硅作为母核;采用在催化剂和分散剂共同作用下水解硅粉的方法使母核二氧化硅颗粒进一步增长,得到了高均匀分布的平均粒径在100nm以上、浓度可达50%的二氧化硅溶胶。并对新方法下pH值、温度以及母核SiO2的浓度、粒径大小对二氧化硅平均粒径及其均匀性的影响进行了分析。研究结果对制备大颗粒、高浓度的硅溶胶具有积极意义。Silicon dioxide （mother nuclide） with a specific particle size was prepared from sodium silicate through the dropwise technique. The mother nuclide was further growing by hydrolyzing silica powder under the combined effect of catalyst and dispersant, then the silicon dioxide with highly uniform particle diameter of more than 100 nanometers was prepared, and the concentration of the silica sol can reach 50 percent. The effects of such parameters as pH, temperature, concentration and particle size of mother nuclide on the average diameter and uniformity of silicon dioxide were investigated.

关 键 词：水玻璃 硅粉 硅溶胶 纳米二氧化硅 大颗粒 

分 类 号：TQ127.2[化学工程—无机化工]