摘要
以正硅酸乙酯、去离子水和无水乙醇为原料,以盐酸和稀氨水为催化剂,采用酸-碱二步催化工艺制备了SiO2溶胶,并以粘度和凝胶时间表征SiO2溶胶体系的稳定性,探索了加水量、无水乙醇用量、pH值、酸-碱催化间隔时间及反应温度对SiO2溶胶体系稳定性的影响。结果表明,随着加水量增加和pH值升高,SiO2溶胶体系稳定性先降低后增强;提高反应温度和延长酸-碱催化间隔时间,SiO2溶胶体系的稳定性迅速下降;增加无水乙醇用量有利于提高SiO2溶胶体系的稳定性。
Silica sol was fabricated by using tetraethyl orthosilicate, deionized water and ethanol as raw materials,and hydrochloride and dilute ammonia solution as catalyst for two-step acid-base catalytic process. The stability of the silica sol system was characterized by viscosity and gel time. The effect of deionized water, ethanol, pH,acid-base catalytic interval time and reaction temperature of silica sol system on the silica sol stability was investigated. The researched results show that the stability of silica sol is decreased firstly and then increased with the increasing of both deionized water and pH,but is decreased rapidly with the rising of reaction temperature and prolonging of acid-base catalytic interval time, and that increasing the amount of ethanol is beneficial to the stability of silica sol system.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第7期14-19,共6页
Journal of Wuhan University of Technology
