| abstract |
Method for the production of casting molds, cores and mold base materials regenerated from them, with the following steps for the production of a casting mold or a core: - supplying or producing a mixture of mold material comprising - a mold base material - a solution or dispersion comprising water glass - from 0.1% to 3% by weight of particulate amorphous silicon dioxide and, to facilitate disintegration and / or increase regeneration capacity of the casting mold or core - one or more particulate phyllosilicates in a total amount of 0.05% to 0.4% by weight, where the d90 value of the total amount of phyllosilicates is less than 45 μm, i.e. that 90% of the phyllosilicate particles contained in the mold material mixture are smaller than 45 μm, where the d90 value is determined by images taken with a scanning electron microscope, where the percentages are each based on mass total of l a mold material mixture, - molding the mold material mixture, - curing of the mold material mixture by chemical reaction of the components of the mold material mixture with each other, so that the casting mold is formed or the male. |