Furan no-bake foundry binders and their use

B - Operations – Transporting – 22 – C

Patent

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B22C 1/20 (2006.01) B22C 1/22 (2006.01)

Patent

CA 2401418

This invention relates to furan no-bake foundry binders comprising (a) furfuryl alcohol and/or a reactive furan resin; (b) an activator selected from the group consisting of resorcinol, resorcinol pitch, and bisphenol A tar; (c) a bisphenol compound; (d) a polyol selected from the group consisting of polyester polyols, polyether polyols, and mixtures thereof, and preferably (e) a silane. The binders are cured in the presence of the furan curing catalyst. The invention also relates to foundry mixes prepared with the binder, foundry shapes prepared with the foundry mix, and metal castings prepared with the foundry shapes.

Cette invention concerne des liants furanniques de fonderie sans cuisson contenant (a) un alcool furfurylique et/ou une résine furannique réactive, (b) un activateur choisi dans le groupe comprenant le résorcinol, la poix de résorcinol et le goudron de bisphénol A, (c) un composé de bisphénol, (d) un polyol choisi dans le groupe comprenant des polyols de polyester, des polyols de polyéther et des mélanges de ceux-ci, et de préférence (e) un silane. Les liants sont durcis en la présence du catalyseur de durcissement au furane. L'invention concerne également des mélanges de fonderie préparés avec le liant, des formes de fonderie préparées avec le mélange de fonderie, et des pièces coulées métalliques préparées avec les formes de fonderie.

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