METHOD FOR PRODUCING SILICA COMPOSITE MEMBRANE WITH HIGH THERMAL STABILITY BY SOAKING-ROLLING PROCESS

摘要

PURPOSE: Provided is a method for producing silica composite membrane which is thermally stabilized by forming a fine-surface coating layer on the inner surface of pores of support material. CONSTITUTION: The method comprises (a) infiltrating silica zero gel into the surface of porous support by rolling for surface processing, (b) impregnating γ-alumina sol into the surface of the porous support by impregnating-rolling process, drying and calcining the porous support, for surface processing, and (c) impregnating coating material sol onto the surface of the porous support by impregnating-rolling process, drying and calcining the porous support, thereby producing silica composite membrane with a pore size of 5 to 10 nm, wherein porous support is dried at a temperature of 20 to 30°C and relative humidity of 50 to 70% for 10 to 15 hrs, and is calcined at a temperature of 500 to 600°C.