Binder containing substituted benzenes and naphthalenes for producing cores and molds for metal casting, mold material mixture, and method
AssigneeASK Chemicals GmbH
InventorsChristian Priebe, Diether Koch
Life of this patent
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Abstract
A binder for mold material mixtures is a four-component material. It contains at least one phenolic resin component, at least one isocyanate component, at least one alkyl/alkenyl benzene and at least one dialkylated and/or dialkenylated naphthalene. The phenolic resin component acts as the polyol component and contains phenolic resin obtainable from the reaction between a phenol compound and an aldehyde compound. The isocyanate component contains at least one polyisocyanate with at least two NCO groups per molecule. The alkyl/alkenyl benzene has a boiling point above 250° C. The dialkylated and/or dialkenylated naphthalene has a boiling point above 270° C.
Claims21
A binder for mold material mixtures, comprising:
- (A) at least one phenolic resin component as the polyol component containing phenolic resin, wherein the phenolic resin is obtained from the reaction between a phenol compound and an aldehyde compound,
- (B) at least one isocyanate component containing at least one polyisocyanate with at least two NCO groups per molecule, and
- (C) at least one alkyl/alkenyl benzene with a boiling point above 250° C., and
- (D) at least one of:
- dialkylated naphthalene and dialkenylated naphthalene, each having a boiling point above 270° C.
A mold material mixture comprising:
- the binder according to one or more of the preceding claims;
- and
- a refractory mold material, wherein the mold material contains or consists of one or more members of the group consisting of:
- silicon dioxide, zirconium sand, chromium sand, olivine, refractory clay, bauxite, aluminum silicate hollow spheres, glass beads, granulated glass, and synthetic ceramic mold base materials.
Dependencies are inferred from the claim text.