SILICA PARTICLES AND METHOD OF PREPARING THE SAME

摘要

Provided are methods of preparing silica particles having two maximum values in number particle size distribution, wherein in the two maximum values, a particle size ratio (a maximum value of a small-size side/a maximum value of a large-size side) between a maximum value of a large-size side and a maximum value of a small-size side is from 0.02 to 0.3, and a number ratio (a number of silica particles having a maximum value of the small-size side/number of silica particles having a maximum value of the large-size side) is from 1 to 100, and particles within a range of 10% from the large-size side of the silica particles have an average circularity of from 0.65 to 0.90 and an average shrinkage ratio of from 10 to 50.

主权项

1. A method of preparing silica particles, comprising:
preparing an alkaline catalyst solution in which an alcohol-containing solvent contains an alkaline catalyst at a concentration of from 0.6 mol/L to 1.0 mol/L; and supplying tetraalkoxysilane and an alkaline catalyst into the alkaline catalyst solution, wherein the supplying satisfies the following conditions, within a range of from A/2 to A, there is a part where C/B is from 15 (mol/L)/{(mol/min)L} to 60 (mol/L)/{(mol/min)L}, wherein, A represents the total amount of the tetraalkoxysilane supplied, B represents (a flow rate of the tetraalkoxysilane supplied)/(a total amount of a solution formed when the tetraalkoxysilane and an alkaline catalyst are supplied into the alkaline catalyst solution), and C represents a concentration of water in a reaction system.