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通过憎水振动表面常压连续制备二氧化硅气凝胶球填料
作者:?健1?张爱满1??猛2??奇1??新1?吕正航1?马保国1?
单位:(1.?武汉理工大学?硅酸盐建筑材料国家重点实验室?武汉?430070?2.华新新型建筑材料有限公司?武汉?430000)?
关键词:憎水振动表面?滴落法?常压?二氧化硅?气凝胶?球状填料?
分类号:TB32
出版年,卷(期):页码:2019,47(8):0-0
DOI:
摘要:

?以硅溶胶为低成本前驱体,采用滴落法,通过憎水振动表面常压干燥连续制备了SiO2气凝胶球填料,分析了溶胶液滴受力。结果表明:所制备的气凝胶球圆度值更接近1,气凝胶球更接近球形。体系凝胶时间可控制在30 min以内,气凝胶球粒径为1~6 mm,圆度值≤1.3,样品的表观密度为0.152~0.186 g/cm3,比表面积为387~481 m2/g。随着硅水比的增大,气凝胶球密度总体增大。样品具有连续多孔网络结构和优异的疏水性。当硅水比(质量比)为0.03时,气凝胶骨架上可接枝最多的三甲基硅氧烷,疏水角达155°,并连续稳定成球。

基金项目:
国家“十三五”重点研发计划(2016YFC0700905-04,2016YFC0700904)。
作者简介:
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