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US 9,410,058 B2Granted
Compositions and methods for water-resistant gypsum fiber products
AssigneeUnited States Gypsum Company
InventorsDavid R. Blackburn, Yufeng Xu
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Abstract
A water-resistant gypsum fiber product comprising siloxane and coated with a coating comprising alkali metal organosiliconate is provided. A method of making a gypsum fiber product in which siloxane is cross-linked at the surface of the product is also provided. A fuel-efficient method for making the product and reducing the amount of siloxane dust released is provided as well.
Claims5
A method for decreasing the amount of siloxane dust generated in a kiln, the method comprising:
- preparing a gypsum slurry comprising calcium sulfate dihydrate;
- heating the slurry under pressure to calcine the calcium sulfate dihydrate to form alpha-calcined calcium sulfate hemihydrate;
- relieving the pressure;
- after the step of calcining under pressure has been completed and the pressure has been relieved, adding a siloxane dispersion to the slurry;
- dewatering the slurry to form a filter cake;
- forming the cake into a desired shape;
- allowing the cake to set to form a product;
- coating the product with a coating comprising alkali metal organosiliconate;
- placing the coated product in the kiln;
- and
- thereby decreasing the amount of siloxane dust generated in a kiln.
8 more elements
Dependencies are inferred from the claim text.