Quick-hardening core and molding sand composition, and a method for its hardening
AssigneeInstytut Odlewnictwa
InventorsJan Harpula, Jur Piszak, Mieczyslaw Debski, Tadeusz Rzepa, Jerzy Sliwa, Andrzej Heryan
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Abstract
A quick-setting core and molding sand comprising quartz sand, a binder and an adsorbent or absorbent. The binder is a solution of a binding agent such as polystyrene, polyvinyl acetate or the like in an appropriate organic solvent. After molding, the sand is hardened by means of blowing it with an inert gas, preferably air or applying a suction thereto. The time of hardening is very short and depends upon the size of a mold or a core which is being made.
Claims5
A quick-hardening core and molding sand composition comprising quartz sand and a binder solution, said binder solution comprising a binding agent of molecular weight of 100,000-350,000 selected from the group consisting of polystyrene, polyvinyl acetate, polymethylmethacrylate, polyethyl-methacrylate, derivatives of cellulose, and mixtures thereof, and an organic solvent for the binding agent selected from the group consisting of aliphatic and aromatic hydrocarbons, said binding agent being present in said solution in a concentration of 10 to 65%.
Dependencies are inferred from the claim text.