METHODS FOR RECLAIMING GYPSUM PANELS THAT CONTAIN HYDROPHOBIC MATERIALS AND USE THEREOF
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United States of America Patent
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Oct 28, 2021
app pub date -
Mar 24, 2021
filing date -
Apr 28, 2020
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Abstract
A method for making a gypsum board including:
- combining a first plurality of particles including at least about 50 wt. % calcium sulfate dihydrate and about 0.05 wt. % to about 10 wt. % hydrophobic material and having a D50 particle size of about 200 μm to about 800 μm with a second plurality of particles including calcium sulfate hemihydrate to form a combined mixture of calcium sulfate;adding water to the combined mixture of calcium sulfate to make an aqueous gypsum slurry;depositing a core layer including the aqueous gypsum slurry over a forming surface; andallowing the core layer to set, thereby forming a set gypsum core.
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