High starch light weight gypsum wallboard

B - Operations – Transporting – 23 – B

Patent

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B23B 13/00 (2006.01) B23B 37/00 (2006.01)

Patent

CA 2607896

The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1% - 3.0% by weight based on the weight of dry stucco. The pregelatinized starch is present in an amount of at least about 0.5% by weight up to about 10% by weight of pregelatinized starch by weight based on the weight of dry stucco in the formulation. Other slurry additives can include trimetaphosphate salts, accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard.

L'invention concerne des boues contenant du gypse et comprenant un stucco, un dispersant de naphthalènesulfonate et un amidon prégélatinisé. Le dispersant de naphthalènesulfonate est présent dans une quantité comprise entre environ 0,1 % et 3,0 % en poids sur la base du poids du stucco séché. L'amidon prégélatinisé est présent dans une quantité d'au moins environ 0,5 % en poids jusqu'à environ 10 % en poids de l'amidon prégélatinisé en poids sur la base du poids du stucco séché de la formulation. D'autres additifs de boues peuvent comprendre des sels de trimétaphosphate, des accélérateurs, des liants, de la fibre à papier, de la fibre de verre et autres ingrédients connus. L'invention comprend également des produits contenant du gypse et obtenus à partir de ces boues, par exemple, un panneau mural du gypse, et porte sur un procédé de fabrication d'un panneau mural de gypse.

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