Two-component binder system for the polyurethane cold-box process
AssigneeHüTtenes-Albertus Chemische Werke Gesellschaft Mit BeschräNkter Haftung
InventorFrank LENZEN
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Abstract
A description is given of a two-component binder system particularly for use in the polyurethane cold box process, a mixture for curing by contacting with a tertiary amine, a method for producing a feeder, a foundry mold or a foundry core, and also feeders, foundry molds and foundry cores producible by this method, and the use of a two-component binder system of the invention or of a mixture of the invention for binding a mold raw material or a mixture of mold raw materials, in particular in the polyurethane cold box process.
Claims15
A two-component binder system for use in the polyurethane cold box process consisting of a phenolic resin component (i) and of a separate polyisocyanate component (ii), where
- (i) the phenolic resin component comprises
- an ortho-fused phenolic resole having etherified and/or free methylol groups, and
- a solvent comprising as constituents
- (a) one or more compounds from the group of the alkyl silicates and alkyl silicate oligomers and
- (b) one or more compounds from the group of the dialkyl esters of C4-C6 dicarboxylic acids,
- optionally one or more additives
- and
- (ii) the polyisocyanate component comprises
- a polyisocyanate having at least two isocyanate groups per molecule
- and also optionally a solvent, and
- optionally one or more additives,
- the fraction of the mass of polyisocyanate in the polyisocyanate component (ii) being 90% or more based on the total mass of the polyisocyanate component (ii),
- and
- the ratio of the mass of polyisocyanate in the polyisocyanate component (ii) to the mass of ortho-fused phenolic resole having etherified and/or free methylol groups in the phenolic resin component (i) being less than 1.1.
Dependencies are inferred from the claim text.