摘要
通过测量质量损失、红外光谱分析、核磁共振分析等方法研究了不同浓度水玻璃溶液中滴加无水乙醇时溶液体系的变化规律。随无水乙醇的加入,溶液体系会出现分层现象,上层为澄清的乙醇水溶液,下层为有流动性的硅酸钠胶体溶液;同时发现,要形成稳定的硅酸钠胶体溶液,滴加的乙醇量存在一临界值,当超过该临界值时,硅酸钠胶体溶液变成不流动的沉淀固体。提出一种机制来解释无水乙醇的作用:乙醇分子与水分子之间的结合拉近了硅酸钠胶粒之间的距离,这有助于排除多余的水,从而降低水玻璃溶液的干燥时间及干燥过程中的能量消耗。
Change laws of sodium silicate solutions with different concentrations added by anhydrous alcohols were investigated,which were analyzed by weight loss,FT-IR,and 1H-NMR etc..Experimental results showed that the liquid is stratified with the addition of alcohol;the supernatant liquid is clarified alcohol solution and the bottom is a colloidal solution of sodium silicate with a flowing quality;It is also discovered that the addition of anhydrous alcohol has a critical value in order to form a stable colloidal solution of sodium silicate;the colloidal solution is changed into a stagnant solid precipitate over the critical values.A possible mechanism was proposed to explain the alcohol action on the solution of sodium silicate：alcohol molecules combined water molecules and narrowed the distance between the colloidal particles of sodium silicate,which benefited removing the excess water and thus reduced the drying time and energy consumption in the process.
出处
《无机盐工业》
CAS
北大核心
2011年第7期25-28,共4页
Inorganic Chemicals Industry
关键词
水玻璃
乙醇
硅酸钠
soluble glass
alcohol
sodium silicate
