Inorganic cellular material and process for the manufacture thereof

US4401471A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Peter Eckardt · Hofheim, DE
• Walter Dursch · Königstein, DE

Key dates

• Filing date: Dec 18, 1981
• Grant date: Aug 30, 1983
• Expiry date: Dec 18, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B28/342
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An inorganic, phosphate-containing cellular material is manufactured from Portland cement, polyphosphoric acid and an expanding agent acting in an acidic medium. There may be added furthermore aluminous cement, oxides of calcium, zinc, aluminum, iron, hydroxides of aluminum and iron, fillers and reinforcing agents. By intense intermixing of the starting products a mixture is prepared which has an equivalent ratio of (Al+Mg+CA+Fe) to phosphate of 0.8:1 to 3.0:1. The mixture foams, is charged to a mold, heated if necessary to a temperature of 80.degree. C., and after completed exothermal reaction hardened under heat.