C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
22/108, 22/158,
C08K 5/14 (2006.01) B22C 1/22 (2006.01) C08K 3/34 (2006.01)
Patent
CA 1165033
ABSTRACT OF THE DISCLOSURE A process is disclosed for curing a sand-furan resin mixture used m foundry practice to form cores and molds by the use or sulfur dioxide gas without forming sulfuric acid. Curing occurs when the furan resin, that is one containing a predominant amount of a furan moiety, is intermixed with a minor amount of a diisoproylbenzene monohydroperoxide (DIPBMHP) or diisopropylbenzene dihydroperoxide (DIPBDHP), or a mixture thereof. In addition to reacting with gaseous sulfur dioxide without forming sulfuric acid, these specific alkaryl hydroperoxides of which the monohydroperoxides have at least one alkyl ring substituent, have the peculiar characteristic of curing the resin in such a way that the DIPBMHP or DIPBDHP moiety becomes chemically bound in the cured resin. The result is a cured core or mold having a novel composition and superior physical properties compared to prior art cores and molds made with furan resins, in which the reaction with sulfur dioxide produces sulfuric acid. Cores end molds made by the instant process perform as well as, or better than those made with hexamethylene tetramine initiated thermally polymerized phenol-formaldehyde novolac resins, when used under comparable shell casting conditions.
388714
Gowling Lafleur Henderson Llp
Hutchings David A.
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