Process for making silicate foams from alkali metal silicates
Abstract
Abstract A PROCESS FOR ECONOMICALLY FORMING MICRO CELLULAR, INORGANIC SILICATE FOAMS FOR USE IN BUILDING CONSTRUCTION AND HAVING GOOD STRUCTURAL, THERMAL AND SOUND INSULATION PROPERTIES. THE PROCESS FOR FORMING SUCH FOAMS COMPRISES THE STEPS OF HYDRATING FINELY DIVIDED PARTICULATE SILICATES WITH WATER AND EXPANDING THE MASS BY INPUT OF THERMAL ENERGY. THE THERMAL ENERGY CAN BE PROVIDED BY A CONVENTIONAL HEAT SOURCE, BY A MICROWAVE ENERGY SOURCE OF BY DISSIPATION OF MECHANICAL ENERGY IN THE MATERIAL. THE SILICATE MAY BE SODIUM SILICATE AND THE SODIUM SILICATE MAY HAVE A RATIO OF SIO2 TO NA2O OF 1:1 TO 5:1 (OR MORE). THE HYDRATED MATERIAL MAY FURTHER COMPRISES OTHER ALKALI METAL SILICATES. IT MAY FURTHER CONTAIN COMPLEXING AGENTS TO INSOLUBILIZE THE RESULTING FOAM, AND OTHER ADDITIVES TO IMPART DESIRABLE PHYSICAL OR CHEMICAL CHARACTERISTICS. THIS METHOD CAN YIELD WATER RESISTANT OR INSOLUBLE SILICATE FOAMS OF MICROCELLULAR CLOSED CELL STRUCTURE, 2 TO 8 P.C.F. DENSITY, HIGH STRENGTH-TO-DENSITY RATIO, AND LOW THERMAL CONDUCTIVITY.
Inventors
- 👤 R Rao
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