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US 7,678,189 B2Granted
Foaming plaster
OwnerEdgar Donald Knottinventor
Life of this patent
Estimating the term…
Abstract
A method of producing a foamed plaster comprises the following steps: (a) mixing plaster of Paris and calcium carbonate; (b) supplying water, and (c) adding phosphoric acid. The phosphoric acid reacts with the calcium carbonate to release gaseous carbon dioxide. It also reacts with any steel present to form an insoluble iron phosphate coating.
Claims20
A method of producing a foamed plaster, said method comprising the steps of:
- (a) mixing plaster of Paris and calcium carbonate, said calcium carbonate being between 2% and 12% by weight of said plaster of Paris;
- (b) supplying water;
- and
- (c) adding phosphoric acid, said phosphoric acid reacting with said calcium carbonate to release gaseous carbon dioxide bubbles, and said water providing water of hydration to said plaster of Paris to form gypsum that sets around said carbon dioxide bubbles thereby forming said foamed plaster.
1 more element
A foamed plaster building panel comprising:
- a plurality of surface sheeting materials having an inner surface featuring a bonding agent and fibers, said surface sheeting materials being configured to form a building panel;
- and
- a foamed plaster core adapted to bond with said bonding agent and fibers of said surface sheeting materials, said foamed plaster core being plaster of Paris, calcium carbonate between 2% and 12% by weight of said plaster of Paris, water in a ratio of about two parts by volume plaster of Paris and calcium carbonate solution to about one part by volume water, and phosphoric acid at a concentration of about 81% to 85% w/v.
A foamed plaster building panel comprising:
- a foamed plaster block comprising plaster of Paris, calcium carbonate about 8% by weight of said plaster of Paris, and about a 5% phosphoric acid solution having water and phosphoric acid.
Dependencies are inferred from the claim text.