Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1984-02-13
1985-04-30
Hayes, Lorenzo B.
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
164525, B28B 736
Patent
active
045142270
ABSTRACT:
A foundry mould binder is manufactured by mixing at least one monobasic acid selected from the group consisting of formic acid, acetic acid, propiolic acid, propionic acid, and acrylic acid, with a precipitant for the acid, and water, the water being present in an amount no greater than 1.5 times the weight of the total acid content, calculated on that acid content being in a water free state. The precipitant contains the equivalent to at least 50% of the stoichiometric requirement of the total acid content of the binder component, said precipitant comprising at least one substance selected from the group consisting of calcium carbonate, dolomite, magnesium oxide, magnesium hydroxide, magnesium carbonate and zinc oxide as cationic metal oxides precursors of these and cationic metal oxides, said precipitant being substantially non-fluxing with the foundry sand, and substantially non-reactive with respect to other mould components than the said acid, and substantially non-reactive with respect to metal which is to be cast in the mould. The precipitant is preferably zinc oxide, and the binder component may further include at least one humectant (e.g. sorbitol) admixed with the remainder to retard the loss of mould tensile strength during periods of low humidity. When acetic and propionic acids are used, they may be provided as an acid precursor in the form of an anhydride of the acid.
REFERENCES:
patent: 2086499 (1937-07-01), Hennig
patent: 2289286 (1942-07-01), Mazabraud
patent: 3014055 (1961-12-01), Johnson
patent: 4108981 (1978-08-01), Muhler et al.
Kirk-Othmer, Ency. of Chem. Tech., 1970, vol. 22, p. 606.
Canadian Patents and Development Limited
Hayes Lorenzo B.
Lemon Francis W.
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