Compositions for foundry molding processes utilizing reclaimed sand
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United States of America Patent
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Jan 21, 1992
Issued Date -
N/A
app pub date -
Aug 16, 1990
filing date -
Apr 8, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a binder solution having a low solids level which provides improved tensile properties when used with reclaimed sand. This binder solution comprises an alkaline phenolic resin which is cured at ambient temperature with an ester-functional curing agent. Also provided by this invention are raw batch formulations comprising sand, a binder solution having a low solids level, and a curing agent. These raw batch formulations include embodiments wherein the low solids levels are obtained by the separate addition of a solvent. The methods for producing foundry molds and cores of this invention included those procedures wherein dilution water is used to reduce the solids contents of conventional, relatively high solids content binder solutions.
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