Gypsum wallboard, and method of making same

Details Gypsum wallboard, and method of making same Gypsum wallboard, and method of making same

C - Chemistry, Metallurgy

04

B

154/69, 261/78.5

C04B 28/14 (2006.01) C04B 24/26 (2006.01)

Patent

CA 2276032

A method of preparation and use of high-strength gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco), water, and a strengthening agent. The strengthening agent includes an acrylic polymer composition having a glass transition temperature of about 15 °C or greater, and preferably has good divalent ion stability. The method provides wallboard having increased core strength, paper-to-core bonding, and strength-to-weight ratio.

L'invention porte sur un procédé de préparation et d'utilisation d'un panneau de placoplâtre haute résistance et d'une composition de noyau appropriée pour être utilisée dans ce panneau. La composition du noyau comprend une suspension de semi-hydrate de sulfate de calcium (stuc), de l'eau et un agent de renforcement. Cet agent de renforcement comprend une composition polymère acrylique dont la température de transition du verre est environ égale ou supérieure à 15 DEG C, et a de préférence une bonne stabilité aux ions divalents. Ce procédé permet d'obtenir un placoplâtre dont la résistance du noyau, la liaison papier-noyau et le rapport résistance/poids ont été améliorés.

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