WET SILICA GELS FOR AIR GEL AND XEROGEL HEAT INSULATION AND A METHOD FOR PREPARING WET SILICA GELS

摘要

inorganic materials technology. SUBSTANCE: preparation involves bringing aqueous silicon dioxide system, pH>7.5, into contact with ion-exchange resin. The latter removes metal ions and replaces them with hydrogen ions until pH of the system drops below 5.0. Aqueous silicon dioxide system is completed by an organic liquid not leading to precipitation of silicon dioxide and a base is also added to adjust pH to 7.5. EFFECT: increased level of organic solvent and lowered alkali metal level in wet silica gel. 21 cl, 5 ex