Process for making low density gypsum products

Details Process for making low density gypsum products Process for making low density gypsum products

C - Chemistry, Metallurgy

04

B

261/79

C04B 22/00 (2006.01) C01B 15/01 (2006.01)

Patent

CA 2016321

ABSTRACT A peroxide compound, such as Hydrogen Peroxide, is added to an aqueous mixture containing plaster, and a suitable catalyst which decomposes the peroxide into free oxygen is added before the mixture has been cast and is allowed to set. The oxygen produced causes immediate and substantial expansion of the mixture, the volume and control of which are maintained through the use of a suitable viscosity adjusting and solids suspending agent. The product has a foam-like structure after drying and may be made to possess a density as low as 0.25 g/cc, or 25% that of water. The invention is distinguished from prior art methods by its replacement of a mechanical method for aerating plaster by a chemical method which is more immediate and effective. The method is particularly applicable to the manufacture of laminated gypsum wall-board.

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