Use of branched alkane diol carboxylic acid diesters in...

B - Operations – Transporting – 22 – C

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B22C 1/22 (2006.01)

Patent

CA 2712656

The invention relates to a molding material mixture for production of molded products for the foundry industry, comprising at least one fire-resistant base molding material and a polyurethane-based binder system comprising a polyisocyanate component and a polyol component. According to the invention, the polyurethane-based binder system comprises a portion of a carboxylic acid diester of a branched alkane diol, said portion being at least 3 weight-%, and a portion of aromatic solvent of less than 10 weight-% of the binder system. A preferable carboxylic acid diester is 2,2,4-trimethyl-1,3-pentandiol-diisobutyrate. The molded products produced from the molding material mixture for the foundry industry are characterized by a high strength and a lower generation of fumes and smoke during pouring.

L'invention concerne un mélange de matières à mouler pour la fabrication de corps moulés destinés à la fonderie, contenant au moins une substance à mouler réfractaire de base et un système de liant à base de polyuréthane renfermant un composant polyisocyanate et un composant polyol. Le système de liant à base de polyuréthane contient une fraction d'un diester d'acide carboxylique d'un alcanediol ramifié constituant au moins 3 % en poids, et une fraction de solvant aromatique constituant moins de 10 % en poids par rapport au système de liant. Le diester d'acide carboxylique employé est de préférence 2,2,4-triméthyl-1,3-pentanediol-diisobutyrate. Les corps moulés fabriqués à partir du mélange de matières à mouler pour la fonderie sont caractérisés par une résistance élevée et par une faible formation de fumées lors du moulage.

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