SUPER-HYDROPHOBIC SILICA AEROGEL GRANULES HAVING A UNIFORM PARTICLE SIZE BY ALLOWING REACTANTS TO UNIFORMLY REACT, AND A MANUFACTURING METHOD THEREOF

摘要

PURPOSE: Silica aerogel granules and a manufacturing method thereof are provided to eliminate the need of a separate manufacturing process, apparatus, or additives, to reduce manufacturing time, and to have excellent permittivity and hydrophobicity, and low thermal conductivity.;CONSTITUTION: A manufacturing method of silica aerogel granules includes the following steps: a step of manufacturing silica sol; a step of mixing a dispersant with a solvent and stirring; a step of additionally adding a pH regulator and stirring; a step of putting the silica sol into the mixture and stirring; a step of washing this; a step of aging or modifying the surface; a step of washing this; and a step of drying this with atmospheric pressure. The solvent is at least one selected from a group composed of benzene, toluene, n-hexane, cyclohexane, xylene, castor oil, and silicone oil. The dispersant is at least one selected from a group composed of metallic soap, lanolin, rosin, cholesterin, lecithin, and sorbitan monoolic ester. The pH regulator is at least one selected among ammonia, pyridine, and hydrazine. The pH regulator is added in order to make the pH of a solution containing the silica sol become 2.5-2.8.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Manufacturing water glass solution(1); (BB) Washing ion-exchange resin(2); (CC) Mixing the water glass solution(1) + the washed ion-exchange resin(2); (DD) Filtering; (EE) Manufacturing silica sol; (FF) Mixing hexane and lanolin; (GG) Pyridine; (HH,JJ) Washing; (II) Aging or modifying the surface; (KK) Drying in atmospheric pressure;