Process to enhance the tensile strength of reclaimed sand bonded with ester cured alkaline phenolic resin
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United States of America Patent
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Aug 24, 1993
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N/A
app pub date -
Nov 12, 1992
filing date -
Jun 15, 1990
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Abstract
The present invention provides methods for treating reclaimed sand obtained from dismantled foundry molds and cores which contain a cured binder derived from an ester cured alkaline phenolic resin. Treatment of the reclaimed sand with a silane solution, particularly an aqueous solution, enhances the tensile strengths of foundry molds and cores produced therefrom beyond those obtained with untreated reclaimed sand. Methods for producing foundry cores and molds which incorporate such a treatment process are also provided by this invention as are raw batch formulations.
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