Chemical binder

Details Chemical binder Chemical binder

C - Chemistry, Metallurgy

08

G

C08G 18/42 (2006.01) B22C 1/22 (2006.01) C08G 18/16 (2006.01) C08G 18/18 (2006.01) C08G 18/20 (2006.01) C08G 18/32 (2006.01) C08L 75/06 (2006.01)

Patent

CA 2213553

A chemical binder comprising an ester-based polyol; an isocyanate; and a catalyst capable of catalyzing a reaction between the ester-based polyol and the isocyanate. Preferably, the chemical binder is used in a mouldable mixture comprising a particulate aggregate and the chemical. Such a mouldable mixture would be in, for example, a disposable foundry mould or core. A process for producing a free-standing mould and a process for casting a metal are also described.

Un liant chimique comprenant un polyol à base d'ester, un isocyanate et un catalyseur capable de catalyser une réaction entre le polyol à base d'ester et l'isocyanate. Le liant chimique est utilisé, de préférence, dans un mélange comprenant un agrégat particulaire et le produit chimique. Un tel mélange moulable serait, par exemple, utilisé dans un moule ou noyau de fonderie jetable. Un procédé pour produire un moule autonome et un procédé pour mouler un métal sont également décrits.

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