高等学校化学学报

高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (11): 959.

• 论文 •    下一篇

29SiNMR谱研究硅溶胶、水玻璃和硅酸乙酯水解液的分散状态

王金晞1, 柳海澄1, 陈荣三1, 陈冰2, 李海志2   

  1. 1. 南京大学配位化学研究所;
    2. 北京航空学院铸造教研室
  • 收稿日期:1986-06-14 出版日期:1987-11-24 发布日期:1987-11-24

Studies on the Dispersion State of Silica Hydrosol, Water Glass and Ethyl Silicate Hydrolysate by 29SiNMR Spectrography

Wang Jinxi1, Liu Haicheng1, Chen Rongsan1, Chen Bing2, Li Haizhi2   

  1. 1. Coordination Chemistry Institute, Nanjing University, Sanjing;
    2. Beijing Institute of Aeronautics and Astronautics, Beijing
  • Received:1986-06-14 Online:1987-11-24 Published:1987-11-24

PDF (PC)

摘要： 硅溶胶、水玻璃和硅酸乙酯水解溶液的29SiNMR谱表明:1.凡硅溶胶都属于典型的胶体溶液。2、水玻璃溶液在SiO2/Na2O摩尔比≤2时,基本上属于可溶性二氧化硅体系,若>2,则随摩尔比增加,胶体成分增加。3、硅酸乙酯水解液在水解时,若H2O/C2H5O-摩尔比<0.5,其组成为多硅酸乙酯溶液;若≥0.5,为小粒子胶体和多环硅酸溶液。

Abstract: The dispersion state of silica hydrosol, water glass and ethyl silicate hydroly-sate is studied by 29SiNMR spectrography. The results indicate that all silica hydrosols are typical colloidal solution. The state of silica in water glass is more complicated. It is in true solution when the mole ratio of SiO,/Na,O is equal to or less than 2, but colloidal behaviour becomes gradually apparent when the mole ratio is more than 2.The state of silica in the hydrolysate is dependant on the mole ratio of H2O/C2H5O; when the ratio is less than 0.5, the product is poly-exthoxysilicate in the solution and when the ratio is equal to or more than 0.5, the product consists of small particulate colloids and polycyclic silicic acids in the solution.

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