Method of producing shaped bodies, particularly cores, molds...

Details Method of producing shaped bodies, particularly cores, molds... Method of producing shaped bodies, particularly cores, molds...

C - Chemistry, Metallurgy

08

G

C08G 18/54 (2006.01) B22C 1/22 (2006.01)

Patent

CA 2508723

The invention relates to a method for producing shaped bodies, particularly cores, molds and feeders for use in foundry practice, comprising the following the steps: a) producing a composition containing: i) at least one phenol resin in solid form; ii) at least one polyisocyanate, and; iii) at least one refractory material, whereby the composition is produced at a temperature that is lower than the melting temperature of the at least one phenol resin; b) shaping the composition to form a shaped body; c) increasing the temperature of the composition above the melting point of the at least one phenol resin in order to harden the mixture. The invention also relates to shaped bodies, particularly cores, molds and feeders for use in foundry practice, which can be obtained by said method, and to a composition such as one used in this method.

L'invention concerne un procédé de production de corps moulés, notamment de noyaux, de moules et de masselottes pour la fonderie. Ce procédé comprend les étapes suivantes : a) production d'une composition contenant i) au moins une résine phénolique sous forme solide, ii) au moins un polyisocyanate et iii) au moins une matière réfractaire, cette composition étant produite à une température inférieure à la température de fusion de la ou des résines phénoliques ; b) formage de la composition pour produire un corps moulé ; c) augmentation de la température de la composition au-delà du point de fusion de la ou des résines phénoliques de façon à durcir le mélange. L'invention concerne également des corps moulés, notamment des noyaux, des moules et des masselottes pour la fonderie pouvant être obtenus par ce procédé, ainsi qu'une composition telle que celle utilisée dans ce procédé.

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