Casting of articles from compositions containing calcined gypsum

Details Casting of articles from compositions containing calcined gypsum Casting of articles from compositions containing calcined gypsum

1978-07-18

1980-05-13

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

106 89, 106 90, 106111, 264 86, 264DIG43, B28B 114

Patent

active

042028574

ABSTRACT:
An article is cast from a composition comprising a binding agent containing, by weight, from 90% to 10% calcined gypsum and from 10% to 90% Portland cement mixed with water to produce a fluid mixture which is caused to flow into a mould or other supporting device and is there allowed to set. To increase the durability of the cast article in the presence of moisture, sodium carbonate in an amount up to 5% by weight of the dry weight of the cement is added to the composition. The sodium carbonate is preferably present in an amount between 0.1% and 0.5% of the dry weight of the cement and the composition preferably also contains an acrylic resin emulsion in an amount from 0.25% to 4% of the dry weight of the gypsum and cement in the composition and a pigment such as iron oxide, titanium oxide or cobalt oxide in an amount from 0.25% to 4% by weight of the dry weight of the gypsum and cement in the composition.

REFERENCES:
patent: 3582376 (1972-06-01), Ames
patent: 3666703 (1972-05-01), Murata
patent: 3852081 (1974-12-01), Lehman
patent: 4021257 (1977-05-01), Bernett
patent: 4032353 (1977-06-01), Ball et al.
patent: 4067939 (1978-01-01), Lowe et al.

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