B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
6/42
B22C 1/20 (2006.01)
Patent
CA 1165507
TITLE A METHOD OF MANUFACTURING A FOUNDRY MOULD MIX CONTAINING BINDER COMPONENTS AND MOULD BINDER COMPONENTS THEREFOR INVERTORS Ervin I. Szabo ABSTRACT OF DISCLOSURE A foundry mould binder component comprising an acid selected from the group consisting of formic acid, acetic acid, acetic anhydride, propiolic acid, propionic acid, propionic anhydride, and acrylic acid, and (i) when the binder component is for admixture with a precipitant and sand it also comprises at least one other acid from the above group, and (ii) when the binder component is for admixture with sand, it also com- prises a precipitant for the acid. The precipitant is for admixture with or contains the equivalent to at least 50% of the stoichiometric require- ment of the total acid content of the binder component when the total acid content is in solution, said precipitant comprising at least one substance selected from the group consisting of cationic metal oxides and cationic metal oxide precursors, 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 into the mould. The precipitant is preferably ground limestone or 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.
392120
Lemon F.w.
Majesty (her) In Right Of Canada As Represented By The Minister Mines And Resources
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