C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 28/14 (2006.01) B32B 13/00 (2006.01)
Patent
CA 2709401
A gypsum slurry includes calcium sulfate hemihydrate, a set retarder in amounts of at least 0.151b/MSF, a set accelerator, water and aqueous foam. The set accelerator is selected to provide nucleation sites for crystallization of calcium sulfate dihydrate and is present in amounts of at least 5 Ib/MSF. The water to calcium sulfate hemihydrate ratio is at least 0.95. Further, aqueous foam is added in amounts sufficient to create a gypsum board having a dry density of about 29 to about 35 lbs/ft3.
L'invention concerne une suspension de gypse incluant du sulfate de calcium hémihydrate, un retardateur de prise en des quantités d'au moins 0,15 livres/MSF, un accélérateur de prise, de l'eau et une mousse aqueuse. L'accélérateur de prise est choisi pour former des sites de nucléation pour cristallisation du sulfate de calcium dihydrate et est présent en des quantités d'au moins 5 livres/MSF. Le rapport entre eau et sulfate de calcium hémihydrate est d'au moins 0,95. En outre, une mousse aqueuse est ajoutée en des quantités suffisantes pour créer un panneau de gypse ayant une masse volumique à sec d'environ 29 à environ 35 livres/pied3.
Li Alfred
Petersen Bruce Lynn
Wittbold James R.
Company United States Gypsum
Moffat & Co.
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