| abstract |
The binders are based on aqueous alkali metal silicate solutions (molar ratio SiO 2 : Me 2 0 = 2.0 to 3.4: 1; Me = Na and / or K; solids content 35 to 50% by weight) and contain reductively aminated mono-, di - or oligosaccharides. As such, reaction products of glucose, galactose or maltose, or their mixtures, with methylamine, ethylamine, butylamine or ethanolamine, or their mixtures, preferably obtained under the influence of hydrogen.n n n The binders are used for the production of moldings from finely divided fillers, for example quartz sand, in particular molds and / or cores for metal casting with the addition of customary inorganic and / or organic hardeners. |