Amino acid-containing moulding material mixture for production of mouldings for the foundry industry
AssigneeHüTtenes-Albertus Chemische Werke Gesellschaft Mit BeschräNkter Haftung
InventorsJaime Díaz Fernández, Wolfgang Seelbach
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Abstract
The present invention relates to a mold material mixture for producing moldings for the foundry industry, in particular for producing foundry molds, cores or feeders for the foundry industry, which comprises A) one or more pourable, refractory fillers, B) a binder system comprising i) formaldehyde, a formaldehyde donor and/or precondensates of formaldehyde and ii) an amino acid. The present invention additionally relates to the use of amino acids in a mold material mixture for producing moldings for the foundry industry or for producing moldings for the foundry industry, a process for producing a mold material mixture and a process for producing a molding for the foundry industry.
Claims17
A mold material mixture for producing moldings for the foundry industry, which comprises
- A) one or more pourable, refractory fillers,
- B) a no-bake binder system comprising
- i) formaldehyde, a formaldehyde donor and/or precondensates of formaldehyde, and
- furan derivatives and/or furfuryl alcohol or precondensates of furan derivatives and/or furfuryl alcohol;
- and
- ii) an amino acid selected from the group consisting of glycine, glutamine, alanine, valine, and serine, wherein the molar ratio of amino acid to free formaldehyde is from 4:1 to 1:0.5.
A kit for producing a mold material mixture and/or for producing a molding, the kit comprising:
- I) a no bake binder system comprising,
- i) formaldehyde, a formaldehyde donor and/or precondensates of formaldehyde, and
- furan derivatives and/or furfuryl alcohol or precondensates of furan derivatives and/or furfuryl alcohol;
- and
- ii) an amino acid selected from the group consisting of glycine, glutamine, alanine, valine, and serine, wherein the molar ratio of amino acid to free formaldehyde is from 4:1 to 1:0.5;
- and
- II) a hardener, wherein the hardener is selected from the group consisting of a sulfonic acid, phosphoric acid, carboxylic acid, methanesulfonic acid and sulfuric acid and mixtures thereof
- and
- III) optionally one or more pourable, refractory fillers.
Dependencies are inferred from the claim text.