Furan phenolic resins for collapsible foundry molds

Details Furan phenolic resins for collapsible foundry molds Furan phenolic resins for collapsible foundry molds

C - Chemistry, Metallurgy

08

G

22/160, 117/48,

C08G 8/06 (2006.01) B22C 1/22 (2006.01) C08G 16/02 (2006.01)

Patent

CA 1112793

ABSTRACT OF THE DISCLOSURE A resin for coating sand and a resin-coated sand produced therefrom wherein the resin is prepared by incor- porating furan into a phenolic novolak resin. In the pre- ferred practice, the resin is produced by reaction of furfuryl alcohol with a phenolic compound at an acid pH to give a furfuryl-phenolic intermediate in a first step, and then, in a second step, reacting the furfural-phenolic intermediate with a lower aliphatic aldehyde to produce the resin. The resin-coated sands of the present invention provide unexpectedly improved shakeout and collapsibility characteristics in the shell process.

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