High hydroxyethylated starch and high dispersant levels in...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/14 (2006.01) B32B 13/08 (2006.01)

Patent

CA 2703358

The invention generally provides gypsum-containing slurries including stucco, a hydroxyethylated starch, naphthalenesulfonate dispersant, and sodium trimetaphosphate. The naphthalenesulfonate dispersant is present in an amount of about 0.1 % - 3.0% by weight based on the weight of dry stucco. The hydroxyethylated starch is present in an amount of from about 0.5% by weight to about 10% by weight based on the weight of dry stucco in the formulation. The sodium trimetaphosphate is present in an amount of about 0.1 % - 0.4% by weight based on the weight of dry stucco. Other slurry additives can include accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, lightweight gypsum wallboard, and a method of making lightweight gypsum wallboard.

L'invention porte d'une manière générale sur des bouillies contenant du plâtre, lesquelles bouillies comprenant du stuc, un amidon hydroxyéthylé, un agent dispersant de naphtalènesulfonate et du trimétaphosphate de sodium. L'agent dispersant de naphtalènesulfonate est présent dans une quantité d'environ 0,1 % - 3,0 % en poids sur la base du poids du stuc sec. L'amidon hydroxyéthylé est présent dans une quantité d'environ 0,5 % en poids à environ 10 % en poids sur la base du poids du stuc sec dans la formulation. Le trimétaphosphate de sodium est présent dans une quantité d'environ 0,1 % - 0,4 % en poids sur la base du poids du stuc sec. D'autres additifs de bouillie peuvent comprendre des accélérateurs, des liants, de la fibre de papier, de la fibre de verre et d'autres ingrédients connus. L'invention comprend également les produits contenant du plâtre faits avec de telles bouillies, par exemple, une plaque de plâtre légère, et sur un procédé de fabrication d'une plaque de plâtre légère.

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