石油炼制与化工
• 基础研究 • 上一篇 下一篇
杨丽静1,田辉平2,龙军2,严加松2
收稿日期:
修回日期:
出版日期:
发布日期:
通讯作者:
Received:
Revised:
Online:
Published:
摘要： 利用TEM和NMR表征技术，分析了碱性硅溶胶的凝胶过程；考察了pH值、浓度、温度等因素对碱性硅溶胶稳定性的影响；核磁分析结果表明，硅溶胶粒子的内部结构为硅氧硅键（-Si-O-Si-），表面层为硅羟基[-SiOH，-Si(OH)2]所覆盖。硅溶胶稳定性研究结果表明，碱性硅溶胶的稳定性随pH值升高而增加；碱性硅溶胶稳定性随浓度和温度的升高而下降；温度低于45℃时，温度对碱性硅溶胶稳定性的影响很小。
关键词: 硅溶胶, 粘结剂, 稳定性, pH值, 浓度, 温度
Abstract: 29Si-NMR and TEM techniques were used to analyze the gelation process of alkaline silica sol and the effects of system pH value, SiO2 concentration and temperature on the sol stability were investigated. It was indicated by 29Si-NMR results that the interior structure of silica sol micelle was consisted of（-Si-O-Si-）, and its surface was covered by –SiOH and -Si(OH)2 groups. Results showed that the stability of alkaline silica sol increased with the increase of system pH value and decreased with the increase of SiO2 concentration and temperature. However, when temperature was below 45℃, little influence of temperature on the stability of alkaline silica sol was observed.
Key words: silica sol, binder, stability, pH value, concentration, temperature
杨丽静1 ,田辉平2 ,龙军2 ,严加松2 . 碱性硅溶胶稳定性的研究[J]. 石油炼制与化工, doi: .
0 / / 推荐
导出引用管理器 EndNote|Ris|BibTeX
链接本文: http://www.sylzyhg.com/CN/
http://www.sylzyhg.com/CN/Y2010/V41/I6/12
京公网安备 11010802027553号
