Method of using landplaster as a wallboard filler

Details Method of using landplaster as a wallboard filler Method of using landplaster as a wallboard filler

C - Chemistry, Metallurgy

04

B

C04B 28/14 (2006.01) B32B 13/08 (2006.01) C04B 38/10 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2673797

A gypsum slurry includes calcium sulfate hemihydrate, water and calcium sulfate dihydrate, where the calcium sulfate dihydrate is added downstream of the mixer. In an optional embodiment, the a gypsum slurry includes calcium sulfate hemihydrate, a polycarboxylate dispersant, water and coated calcium sulfate dihydrate. In this case, the hydrophilic, dispersible coating is selected to serve as a modifier to enhance the ability of the dispersant to fluidize the gypsum slurry.

La présente invention concerne un coulis de gypse comprenant du sulfate de calcium hémihydraté, de l'eau et du sulfate de calcium dihydraté, le sulfate de calcium dihydraté étant ajouté en aval du mélangeur. Dans un autre mode de réalisation, le coulis de gypse comprend du sulfate de calcium hémihydraté, un dispersant à base de polycarboxylate, de l'eau et du sulfate de calcium dihydraté enrobé. Dans ce cas, l'enrobage hydrophile dispersible est choisi de façon à jouer un rôle d'agent modifiant pour renforcer la capacité du dispersant à fluidiser le coulis de gypse.

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