초록 ▼

Molded parts having high flexural strength, based on alkali silicates, can be produced by casting and/or press-molding and curing by heating from aqueous molding compositions which are prepared from an oxide mixture containing amorphous silicic acid and aluminum oxide, as well as, optionally, as an

Molded parts having high flexural strength, based on alkali silicates, can be produced by casting and/or press-molding and curing by heating from aqueous molding compositions which are prepared from an oxide mixture containing amorphous silicic acid and aluminum oxide, as well as, optionally, as an additional component, aqueous, amorphous, disperse-powdery silicic acid, dissolved SiO2, and alkali from alkali silicate solutions, optionally alkali hydroxide or its aqueous solutions and, if desired, fillers, by means of mixing under agitation. By addition of a blowing agent inorganic foamed products can be obtained.

대표청구항 ▼

An aqueous, hardenable molding composition consisting essentially of inorganic components and water in a flowable or press-moldable distribution, said inorganic components comprising stone-forming components consisting of: dissolved SiO2; 1.3-10 parts by weight of a water-free oxide mixture containi

An aqueous, hardenable molding composition consisting essentially of inorganic components and water in a flowable or press-moldable distribution, said inorganic components comprising stone-forming components consisting of: dissolved SiO2; 1.3-10 parts by weight of a water-free oxide mixture containing amorphous SiO2 and aluminum oxide per part of dissolved SiO2; 0.7-2.5 parts by weight of K2O or 0.55-1.5 parts by weight of Na2O per part by weight of dissolved SiO2 or equivalent amounts of the sodium oxide being used for equivalent amounts of the potassium oxide; wherein K2O or Na2O, respectively, is derived from at least one alkali hydroxide selected from the group consisting of sodium hydroxide and potassium hydroxide, an aqueous solution thereof, or an aqueous solution of at least one alkali silicate selected from the group consisting of sodium silicate and potassium silicate, and the dissolved SiO2 is derived from an aqueous solution of at least one alkali silicate selected from the group consisting of sodium silicate and potassium silicate; said composition containing sufficient amounts of water up to attainment of flowability or press-moldability, respectively, and optionally amounts of inert fillers up to the limit of flowability.