Production of foamed gypsum moldings

Details Production of foamed gypsum moldings Production of foamed gypsum moldings

1975-08-14

1977-08-23

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106109, 106110, 106122, C04B 1100

Patent

active

040438252

ABSTRACT:
In the production of a gypsum-based porous body of high strength by foaming a gypsum-water mixture containing alkali, hydrogen peroxide and a decomposition catalyst therefor, the improvement which comprises including in said mixture an acid-reacting compound with active hydrogen atoms in a quantity insufficient for complete neutralization of the alkali. The alkali is preferably calcium and/or magnesium oxide and/or hydroxide and the preferred acid-reacting compounds are phosphates and/or sulfates, especially potassium hydrogen phosphates. The acid-reacting compound is employed in an amount sufficient to neutralize about 5 to 50% of the alkali, the final pH being about 12 to 12.5.

REFERENCES:
patent: 2662825 (1953-12-01), Kauffmann
patent: 3688437 (1972-09-01), Hamrin

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