Heat cured foundry binder systems and their uses

Details Heat cured foundry binder systems and their uses Heat cured foundry binder systems and their uses

B - Operations, Transporting

22

C

B22C 1/22 (2006.01) B22C 9/10 (2006.01) C08K 3/20 (2006.01) C08L 61/00 (2006.01) C08L 61/06 (2006.01) C08L 29/04 (2006.01) C08L 31/04 (2006.01)

Patent

CA 2220359

A heat cured foundry binder system free of nitrogen and formaldehyde which prevents casting defects is useful in the fabrication of a mold for metal casting and comprises a furan resin and a curing catalyst composition containing water, copper aryl sulfonate, aryl sulfonic acid and a copper halide; optionally with polyvinyl alcohol, furfuryl alcohol, polyvinyl acetate and resorcinol pitch and/or bisphenol A tar.

L'invention porte sur un système de liants de fonderie thermodurcissables pour la fabrication de moules de coulage de métaux, exempts d'azote et de formaldhéyde et empêchant les défauts de moulage. Ledit système comporte une résine furanique et un catalyseur de durcissement à base d'eau, d'arylsulfonate de cuivre, d'acide arylsulfonique et d'halogénure de cuivre, éventuellement additionné d'alcool polyvinylique, d'alcool furfurylique, de polyacétate de vinyle, de poix de résorcinol, et/ou de goudron de bisphénol A.

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