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AssigneeHitachi Chemical Company, Ltd.
InventorsSusumu Konii, Shigeo Sase, Masatoshi Yoshida, Shoei Kuroda, Takeshi Sumi
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A novel process for preparing foundry cores or molds and binder materials used therefor are provided. The binder materials comprise (a) an alcohol-soluble phenolic resin, (b) a polyvalent metal hydroxide and/or oxide, (c) water, (d) an organic solvent, and (e) an alkali metal hydroxide. They are admixed with refractory particles, such as sand, and cured with carbon dioxide to form shaped foundry cores or molds. The process and materials of the invention bring about such advantages that curing may be performed with safe carbon dioxide, that shaped foundry cores or molds may be taken out from pattern immediately after curing, and that the products have a superior collapsibility after pouring a molten metal.
A foundry binder material to be cured with carbon dioxide which comprises (a) an alcohol-soluble phenolic resin selected from the group consisting of resoles, novolacs, N-methylene-resoles, dimethylene ether-type resoles, formal-type resoles and mixtures thereof, (b) 10 to 300 parts by weight of a hydroxide and/or oxide of a polyvalent metal selected from the group consisting of an alkaline earth metal, aluminum, zinc, iron, nickel, titanium, silicon, tin, and a mixture thereof, (c) 100-500 parts by weight of water, (d) 1 to 100 parts by weight of an organic solvent selected from the group consisting of an alcohol, an aromatic hydrocarbon, a ketone, an acetic ester, a phthalic ester, an ether, a cellosolve, dimethylformamide, dimethyl sulfoxide and a mixture thereof, and (e) 0.1 to 50 parts by weight of an alkali metal hydroxide, said parts by weight being based on 100 parts by weight of said alcohol-soluble phenolic resin.
A foundry binder composition which comprises:
Dependencies are inferred from the claim text.