Ask Chemicals Gmbh

Ronja Resch

Heinz Deters

Hannes Lincke

Oliver Schmidt

A moulding material mixture with at least one refractory material and water glass as an inorganic binding agent is used for producing casting moulds. The binding agent is cured with the aid of a carbonyl compound that has a molecular weight greater than 88 g/mol and less than 200 g/mol and a boiling point at 1013 hPa greater than 20&#xb0; C. and less than 200&#xb0; C. The at least one carbonyl compound is introduced into the gas phase, or carried with the gas phase. The at least one carbonyl compound has the formula RRC&#x2550;O, where Ris H or a C1 or C2 alkyl and Ris a carboxyl group R&#x2014;C(&#x2550;O)&#x2014;O&#x2014; bonded via the oxygen atom, where R is a C1 to C3 hydrocarbon.

Method, using a carbonyl compound, for producing moulds and cores for metal casting, and the moulds and cores produced thereby

The invention relates to lithium-containing molding material mixtures comprising a refractory main molding material, an inorganic binder, and amorphous silicon dioxide as an additive in the production of molds and cores for metal casting. The invention further relates to a method for producing molds and cores using the molding material mixtures and to molds and cores produced according to the method.

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Velbert, Germany

Ronja Resch