Quick drying plaster
AssigneeGeorgia-Pacific Gypsum LLC
InventorsAnne H. Ksionzyk, Hubert C. Francis
Life of this patent
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Abstract
A method for increasing the drying rate of set plaster by adding fatty alcohol sulfate to the slurry of calcium sulfate hemihydrate from which the plaster is made.
Claims20
A method for increasing the drying rate of set plaster to form fireproofing material consisting essentially of hydrated calcium sulfate hemihydrate, said method consisting essentially of adding to a slurry consisting essentially of calcium sulfate hemihydrate as the solid material a drying accelerant consisting essentially of fatty alcohol sulfate in an amount between about 0.005 and 0.2 wt %, based on the weight of the calcium sulfate hemihydrate in the slurry, and then drying the set plaster.
A method for increasing the drying rate and decreasing the density of set plaster to form casting material that, when dried, has compressive strength superior to that of conventionally-dried plaster products having comparable density, said method consisting essentially of adding to a slurry consisting essentially of calcium sulfate hemihydrate as the solid material polyvinyl alcohol and a drying accelerant consisting essentially of fatty alcohol sulfate in an amount between about 0.005 and 0.2 wt %, based on the weight of the calcium sulfate hemihydrate in the slurry, and then drying the set plaster.
A mixture for forming fireproofing material, said mixture consisting essentially of gypsum and between about 0.005 and about 0.2 wt %, based on the weight of the gypsum, of fatty alcohol sulfate.
A mixture for forming casting material having compressive strength superior to castings of comparable density, consisting essentially of gypsum, polyvinyl alcohol, and a drying agent consisting essentially of fatty alcohol sulfate in a quantity of between about 0.005 and 0.2 wt %, based on the weight of the gypsum.
Dependencies are inferred from the claim text.