Method of manufacturing a light, open-pored, mineral insulating board

US5871677A · kind A · utility

Assignee

• Hebel Aktiengesellschaft · DE

Inventors

• Silke Falke · Finsterwalde, DE
• Emmo Frey · Dachau, DE
• Frithjof KOERDT · Schönborn, DE

Key dates

• Filing date: Jun 12, 1997
• Grant date: Feb 16, 1999
• Expiry date: Jun 12, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B28/18
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In order to manufacture a light, open-pored, mineral insulating board with a gross density below 130 kg/m.sup.3 the following steps are employed: PA1 a) producing a water-solids suspension by intensive mixing of the following raw materials in an intensive mixer with a rotating mix container and a mixer mechanism rotating at a higher speed, using water and, in each case referred to the total content of solids, 40 to 48 M % (mass percent) quartz flour with a specific surface area according to BET of at least 2.5 m.sup.2 /g, 15 to 20 M % slaked lime with a specific surface area of at least 15 m.sup.2 /g, 25 to 35 M % cement, 0.3 to 0.5 M % hydrophobic medium, the rest additives, wherein the ratio of cement to slaked lime amounts to 1.5 to 2.3:1, the binder proportion lies in the range from 45 to 52 M % and the suspension has a water/solids factor (without foam) from 0.7 to 1.2, PA1 b) preparing a foam from water, air and a pore former, with a gross density from 40 to 50 kg/m.sup.3, PA1 c) introducing the foam into the water/solids suspension still present in the mix container with the intensive mixer running and mixing in the foam at a lower speed of rotation of the mixer mechanism wi…