METHOD FOR RAPIDLY MANUFACTURING SILICA SOL BY ADDITION OF A DISPERSION LIQUID COMPRISING ACTIVATED SILICA PARTICLE INTO A SEED PARTICLE DISPERSION AND SILICA SOL PREPARED THEREBY

摘要

PURPOSE: To provide a method for manufacturing a silica sol by adding an activated silicic acid particle having a predetermined size to a seed particle dispersion and performing rapid particle growth of a seed particle. CONSTITUTION: The method comprises a step of adding continuously or intermittently an activated silicic acid particle dispersion to a seed particle dispersion with heating to adhere an activated silicic acid particle to a seed particle, wherein the seed particle dispersion is a water-based seed particle dispersion having an average particle diameter (DLS) measured by a dynamic light scattering method using a laser beam in the range of 5-1,000 nm, and with a pH in the range of 7-12 and the activated silicic acid particle dispersion liquid having an average particle diameter (DLF) measured by the dynamic light scattering method using the laser beam in a range of 2-50 nm (provided that the average particle diameter (DLF) is smaller than the average particle diameter (DLS) and the average particle diameter (DNaF) measured by the NaOH titration method is in the range of 0.9-6 nm). Furthermore, the ratio (DLF)/(DNaF) of the average particle diameter (DLF) to the average particle diameter (DNaF) is in the range of 1.8-30 and the pH is in the range of 5-11.