Manufacturing Method of Particle Size Controllable and Rapidly Synthesizing Silica Sol by the Continuous Addition of Basic Catalyst and the Same Materials

摘要

The present invention relates to a method of synthesizing a silica sol, which is capable of particle size control and rapid synthesis by continuously adding a catalyst; and a silica sol synthesized thereby. In particular, the method comprises the steps of: preparing a precursor silane solution having a precursor silane dissolved in an alcoholic organic solvent, and an aqueous catalyst solution having a basic catalyst mixed with water, respectively; mixing the precursor silane solution with the aqueous catalyst solution to produce a hydrophilic silanol intermediate having one to three hydroxyl groups (-OH) through hydrolysis and condensation reactions; continuously adding the aqueous catalyst solution to the silanol intermediate to form a silica sol; and silanizing the silica sol by using an organic silane. Accordingly, through a reaction of the precursor silane and water in the presence of the basic catalyst, the silanol intermediate having high solubility to alcohol and aqueous solutions may be produced, and by continuously adding a basic aqueous catalyst solution to the silanol intermediate, the silica sol may be synthesized rapidly while the particle size is controlled to be less than or equal to 20 nm.