Binder for dry hot coat foundry process
AssigneeSumitomo Durez Company, Ltd.
InventorsKyohei Funabiki, Noriaki Matsushima, Naomitsu Inouye
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Abstract
A lubricant-containing binder for the dry hot coat foundry method comprising a solid resol type phenolic resin and a lubricant in an amount of about 0.5 to 10 percent by weight with respect to said phenolic resin.
Claims17
A lubricant-containing binder for the dry hot coat foundry method consisting essentially of a solid resol-type phenolic resin produced by the reaction comprising condensation of reactants consisting of a phenol and a formaldehyde source followed by dehydration of the reaction mixture, and a lubricant in an amount of about 0.5 to 10 percent by weight with respect to said phenolic resin, wherein said lubricant is added prior to or during the course of the reaction to produce said solid resol-type phenolic resin.
A binder according to claim 4 wherein said lubricant is added and melted during the course of reaction of said solid resol-type phenolic resin.
A binder according to claim 5 wherein said lubricant is a dispersion.
A process for producing resin-coated sand for use in a shell mold which comprises coating heated sand particles with a lubricant containing binder comprising a solid resol-type phenolic resin produced by the reaction comprising condensation of reactants consisting of a phenol and a formaldehyde source followed by dehydration of the reaction mixture, and a lubricant in an amount of about 0.5 to 10 percent by weight with respect to said phenolic resin, wherein said lubricant is added after the condensation step, but before the dehydration step of the reaction to produce said solid resol-type phenolic resin.
Dependencies are inferred from the claim text.