C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 38/10 (2006.01) E04C 2/04 (2006.01)
Patent
CA 2694162
A gypsum slurry is described that includes water a hydraulic component comprising at least 50% calcined gypsum by weight based on the dry weight of the hydraulic component, foam, a defoamer a polycarboxylate dispersant having olefimc unsaturated mono-carboxylic acid moieties and (poly)oxyalkylene moieties, a first portion of a retarder and a second portion of a retarder In some embodiments of the invention, the defoamer is combined with the dispersant prior to being added to the gypsum slurry The defoamer and dispersant can be added as a physical mixture, wherein the defoamer is attached onto the dispersant polymer or a combination thereof In some embodiments, a gypsum building panel is made from the gypsum slurry
L'invention porte sur une bouillie de gypse qui comprend de l'eau, un composant hydraulique comprenant au moins 50 % de gypse calciné en poids sur la base du poids sec du composant hydraulique, une mousse, un agent anti-mousse, un dispersant polycarboxylate ayant des fractions acide monocarboxylique à insaturation oléfinique et des fractions (poly) oxyalkylène, une première fraction d'un retardateur et une seconde fraction d'un retardateur. Dans certains modes de réalisation de l'invention, l'agent anti-mousse est combiné avec le dispersant avant d'être ajouté à la bouillie de gypse. L'agent anti-mousse et le dispersant peuvent être ajoutés en tant que mélange physique, l'agent anti-mousse étant attaché sur le polymère dispersant ou une combinaison de celui-ci. Dans certains modes de réalisation, un panneau de construction de gypse est fait à partir de la bouillie de gypse.
Li Alfred
Petersen Bruce Lynn
Wittbold James R.
Company United States Gypsum
Moffat & Co.
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