METHOD FOR PRODUCING POROUS SILICA-BASED PARTICLE AND POROUS SILICA-BASED PARTICLE OBTAINED BY THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a new method for producing porous silica-based particles having a relatively large average diameter of a micrometer or larger and low particle density; and the porous silica-based particles obtained by the same. SOLUTION: The method for producing the porous silica-based particles includes (a) a process for preparing a two-layer separated liquid comprising an organosilicon compound layer and a water layer, and then preparing a precursor for the silica-based particles by partially hydrolyzing and/or hydrolyzing the organosilicon compound in a mixed aqueous solution by adding an organic solvent, an alkali and a surfactant into the water layer while agitating the liquid in such a manner that the organosilicon compound layer and the water layer are not completely mixed, (b) a process for preparing the silica-based particles each having pore parts or gap parts at its inside by adding sodium aluminate into the mixed aqueous solution containing the precursor for the silica-based particles, and (c) a process for cleaning and drying the porous silica-based particles. COPYRIGHT: (C)2006,JPO&NCIPI