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

摘要

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° C. and less than 200° 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 R¹R²C═O, where R¹ is H or a C1 or C2 alkyl and R² is a carboxyl group R—C(═O)—O— bonded via the oxygen atom, where R is a C1 to C3 hydrocarbon.