雾化法常压干燥制备SiO2气凝胶微球及其性能研究  

Preparation and Properties of SiO2 Aerogel Microspheres by Atomization and Ambient Drying

作　　者：李红伟[1] 饶欣远 杨定坤 曹亚华[1] 逯攀岩 耿刚强[1] LI Hongwei;RAO Xinyuan;YANG Dingkun;CAO Yahua;LU Panyan;GENG Gangqiang(School of material science ＆ engineering, Chang＇ an University, Xi＇an 710064, China;AECC South Industry Co., Ltd, Zhuzhou 412002, China)

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]中国航发南方工业有限公司,株洲412002

出　　处：《中国陶瓷》2018年第4期19-23,共5页China Ceramics

基　　金：国家青年科学基金项目(51202015)

摘　　要：以水玻璃为硅源,经离子交换制备硅溶胶,以甲酰胺为分散剂和干燥控制剂,混合后雾化喷入预制的油相中,结合其凝胶时间控制搅拌过程使之凝胶化成微球,并经过多次溶剂交换在常压干燥条件下获得粒径均匀、分散性好的SiO_2气凝胶微球。BET分析表明其比表面积约为709.3m^2/g,平均孔径为11.2nm;SEM分析表明微球直径约10~20μm,表面为连续网络纳米孔结构;FT-IR分析显示其在制备过程枝接了-CH_3,具有良好疏水性;DSC-TGA分析显示1000℃内具有良好的热稳定性。In this paper, silica sol which was come from industrial water-glass by ion-change method and formamide as dispersant and drying control agent was mixed, and then was sprayed into prefabricated oil solution. Silica gel microspheres could be obtained by accurately controlling stirring time according to the gel time,and solvent exchange was used many times. Finally, uniform and good dispersed silica aerogel microsphereswas prepared under ambient drying. BET analysis indicates that its specific surface area is about 709m^2/g, and the mean pore size is about 11.2 nm; SEM indicates that microphere diameter is about 20 μm and its microstructure has continuous network with nanopore; FT-IR indicates that it is grafted-CH_3 during its preparation with a good hydrophobicity; DSC-TGA analysis indicates that it has a good thermal stability below 1000 ℃.

关 键 词：SIO2气凝胶 常压干燥 微球 雾化法 

分 类 号：TB383[一般工业技术—材料科学与工程]