エチルシリケートの加水分解過程におけるケイ酸ゾルの粘度の変化

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タイトル別名
  • Viscosity Change of the Silica Sol during Hydrolysis of Ethylsilicate

説明

The viscosity change of silica sol in the process of hydrolysis of ethylsilicate is measured by the falling ball method. With ethylsilicate 40, a pentamer on average of ethyl-silicate, as a starting material, the hydrolysis proceeds as Si5(OC2H5)12O4+12H2O→Si5(OH)12O4+12C2H5OH. With enough quantity of H2O for hydrolysis, the sol transforms to a gel quickly. In this study, the mole ratio H2O/ethylsilicate 40 is 1.83~2.83; the amount of water is smaller than that of the stoichiometric ratio. At temperatures below 25°C, viscosity increases to several poises in about 30 days, then due to the lack of water, the viscosity increases slowly as log η∝t for about 60 days up to about 100 poise. Finally the viscosity increase is remarkably accelerated.

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