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US 9,493,602 B2Granted
Polyurethaner-based binder for producing cores and casting molds using isocyanates containing a uretonimine and/or carbodiimide group, a mold material mixture containing said binder, and a method using said binder
AssigneeASK Chemicals GmbH
InventorsCarsten Cornelissen, Diether Koch, Christian Priebe
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Abstract
The present invention relates to a polyurethane-based binder using isocyanates containing uretonimine and/or carbodiimide groups for producing cores and casting molds, to a mold material mixture containing the binder, and to a method using the binder for producing casting molds.
Claims20
A binder for mold material mixtures, comprising:
- (A) one or more polyol compounds comprising at least 2 hydroxy groups per molecule, containing at least one phenolic resin as the polyol compound;
- and
- (B) one or more isocyanate compounds comprising per molecule, at least 2 isocyanate groups and at least one of:
- a uretonimine group and a carbodiimide group.
1 more element
A mold material mixture, comprising as the binder:
- (A) one or more polyol compounds comprising at least 2 hydroxy groups per molecule;
- (B) one or more isocyanate compounds comprising per molecule, at least 2 isocyanate groups and at least one of:
- a uretonimine group and a carbodiimide group;
- and
- (C) refractory mold base materials.
2 more elements
A method for producing a shaped body as a casting mold or as a core, comprising:
- (i) mixing refractory mold base materials with a binder, comprising:
- (A) one or more polyol compounds comprising at least 2 hydroxy groups per molecule;
- and
- (B) one or more isocyanate compounds comprising per molecule, at least 2 isocyanate groups and at least one of:
- a uretonimine group and a carbodiimide group, in a binding quantity of 0.2 to 5% by weight, relative to the amount of refractory mold base material, so as to obtain a mold material mixture;
- (ii) introducing the mold material mixture or the ingredients thereof into a shaping tool;
- (iii) curing the mold material mixture in the shaping tool so as to obtain an integral mold;
- and
- (iv) subsequently separating the cured mold from the tool and optionally curing the same further, whereby a cured shaped body is obtained.
6 more elements
Dependencies are inferred from the claim text.