Phenolic resin binder for shell-molds and resin- coated sand...

Details Phenolic resin binder for shell-molds and resin- coated sand... Phenolic resin binder for shell-molds and resin- coated sand...

B - Operations, Transporting

22

C

117/48, 402/48,

B22C 1/22 (2006.01) B22C 1/26 (2006.01)

Patent

CA 1196450

ABSTRACT This invention relates to phenolic resin useful as binder in the preparation of foundry sand cores and molds. The phenol component of the resin is reacted, under acidic conditions, with a sugar and following this reaction is sub- sequently reacted with a formaldehyde source under acidic conditions to form a novolac type phenolic, or under alkaline conditions to form a resole type phenolic. The invention also includes the process for preparing coated sand for use as foundry resin-coated sand in shell-molding operations.

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