C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 24/38 (2006.01) B32B 13/00 (2006.01)
Patent
CA 2657921
The invention provides in one embodiment a gypsum-containing slurry including stucco and an aqueous pre-dispersion of a pregelatinized starch. Also provided is a method of making gypsum wallboard by providing a pre-dispersion of the pregelatinized starch in water, and adding the pregelatinized starch pre-dispersion to the gypsum-containing slurry. The pregelatinized starch can have a particle size distribution within the following range: d (0.1) = about 20 µ - 35 µ, d (0.5) = about 60 µ - 110 µ, d (0.9) = about 100 µ - 220 µ.
L'invention concerne selon un mode de réalisation une pâte contenant du gypse, comprenant du stuc et une pré-dispersion aqueuse d'un amidon prégélatinisé. L'invention concerne également un procédé de fabrication d'un panneau de revêtement en gypse en utilisant une pré-dispersion de l'amidon prégélatinisé dans de l'eau et en ajoutant la pré-dispersion d'amidon prégélatinisé à la pâte contenant du gypse. L'amidon prégélatinisé peut avoir une distribution de tailles de particules comprise dans la gamme suivante : d (0,1) = environ 20 µ - 35 µ, d (0,5) = environ 60 µ - 110 µ, d (0,9) = environ 100 µ - 220 µ.
Song Weixin David
Yu Qiang
Company United States Gypsum
Moffat & Co.
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