纳米硅溶胶的制备条件对粒径与稳定性的影响  

Influence of Preparation Conditions of Nano Silica Sol on Its Particle Size and Stability

作　　者：王晨铭 蒋佳妙 陈家玉 杨鲜 杨柳 WANG Chen-ming;JIANG Jia-miao;CHEN Jia-yu;YANG Xian;YANG Liu(College of Chemistry and Chemical Engineering,Neijiang Normal University,Neijiang Sichuan 641100,China;Sichuan Science and Technology Resources Sharing Service Platform of Special Agricultural Resources in Tuojiang River Basin,Neijiang Sichuan 641100,China)

机构地区：[1]内江师范学院化学化工学院,四川内江641100 [2]沱江流域特色农业资源四川省科技资源共享服务平台,四川内江641100

出　　处：《辽宁化工》2024年第1期9-13,64,共6页Liaoning Chemical Industry

基　　金：四川省科技厅重点研发项目(项目编号:2021YFG0281);内江市科技计划项目(项目编号:2020KJJH003);大学生创新创业训练项目(项目编号:X2021056;X2022228)。

摘　　要：硅溶胶是无固定形态的二氧化硅(mSiO_(2)·H_(2)O)颗粒在水中均匀分散形成的胶体。硅溶胶中二氧化硅颗粒表面含大量的羟基具有很强的活性。本实验以10%的硅酸钠为原料,通过离子交换法和母液增长法制备不同粒径的硅溶胶,考察了反应温度、反应时间、搅拌速度以及原料类型对硅溶胶粒径和分散性的影响。结果表明,制备较小粒径硅溶胶的最佳反应条件为:搅拌强度150 r/min、反应温度75℃、反应时间4 h,NaOH调节pH;制备较大粒径硅溶胶的最佳反应条件为:原料为搅拌强度150r/min、反应温度95℃、反应时间6h、用硅酸钠调pH;在该条件下,经过三次粒径增长,可制得最大粒径为11.69nm的硅溶胶产品,且稳定性与分散度较好,不易凝胶。Silica sol is a colloid formed by homogeneous dispersion of silicon dioxide particles without fixed form in water.Silica sol has a strong activity due to the surface of silica particles containing a large number of hydroxyl groups.In this experiment,sodium silicate was used as raw material to prepare silica sol with different particle size by ion exchange method and mother liquor growth method.The effects of reaction temperature,reaction time,stirring speed and raw material type on silica sol particle size and dispersion were investigated.The results indicated that the best reaction conditions for preparing silica sol with small particle size were as follows:stirring strength 150 r·min^(-1),reaction temperature 75℃,reaction time 4 h,using NaOH to adjust pH.The optimum reaction conditions for preparing silica sol with large particle size were as follows:stirring strength 150 r·min^(-1),reaction temperature 95℃,reaction time 6 h,and adjusting pH with sodium silicate.Under these conditions,after three times of particle size increased,the silica sol product with the maximum particle size of 11.69 nm was prepared,and it had good stability and dispersion and was not easy to gel.

关 键 词：硅溶胶 硅酸钠 活性硅酸 母液增长法 

分 类 号：TQ016[化学工程]