Mold-resistant gypsum panel and method of making same

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/12 (2006.01) C04B 28/14 (2006.01) E04C 2/04 (2006.01)

Patent

CA 2487367

The present invention provides a mold-resistant gypsum panel that includes a core of an interlocking matrix of calcium sulfate dihydrate crystals, a facing material on at least one side of the panel and a salt of pyrithione dispersed through both the core and the facing material. Another aspect of the present invention is a method of making a mold-resistant gypsum product. A slurry of calcined gypsum, water and a water-soluble pyrithione salt is formed, then deposited on a sheet of facing material. The slurry on the facing material is shaped into a panel and maintained under conditions sufficient for the calcined gypsum to react with the water to form a core comprising an interlocking matrix of set gypsum crystals. Heating of the panel causes evaporation of the water that did riot react with the calcined gypsum.

Cette invention concerne une plaque de plâtre résistant aux moisissures comprenant une âme composée d'une matrice entrecroisée de cristaux de sulfate de calcium dihydraté, un matériau de parement appliqué sur au moins un côté de la plaque ainsi qu'un sel de pyrithione dispersé à la fois dans l'âme et dans le matériau de parement. Cette invention concerne également un procédé de fabrication d'un produit de plâtre résistant aux moisissures. Une pâte de plâtre cuit, d'eau et de sel de pyrithione hydrosoluble est formée puis appliquée sur une feuille de matériau de parement. La pâte appliquée sur le matériau de parement est façonnée en forme de plaque et conservée dans des conditions suffisantes pour que le plâtre cuit réagisse avec l'eau pour former une âme comprenant une matrice entrecroisée de cristaux de plâtre durci. Le chauffage de la plaque entraîne l'évaporation de l'eau qui n'a pas réagi avec le plâtre cuit.

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