Method of producing sand mold comprising curing a resin and a binder by the same curing agent
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United States of America Patent
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Feb 28, 2023
Grant Date -
Oct 14, 2021
app pub date -
Jun 15, 2021
filing date -
Feb 28, 2017
priority date (Note) -
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Abstract
A method for producing a sand mold includes mixing artificial sand with a furan resin composition including a furan resin precursor, preparing molding sand having the artificial sand and a surface-modified layer containing a resin cured product covering the artificial sand and including a curing agent attached to the surface-modified layer by mixing the curing agent including xylene sulfonic acid with the artificial sand with which the furan resin composition is mixed, and curing the furan resin composition, after mixing the artificial sand with the furan resin composition, and curing an added portion of the binder in the molding sand by adding the binder to the molding sand. In the step of curing the added portion of the binder, the curing agent for curing the furan resin composition is used also as a curing agent for curing the binder.
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