The influence of metal oxide nanoparticles on properties of water glass

Barbara Hutera, Barbara Stypuła, Angelika Kmita, Dariusz Drożyński

Quarterly No. 2, 2012 pages 142-145

DOI:

keywords: modification, water glass, nanoparticles

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abstract Determination of the influence of the colloidal nanoparticles of zinc oxide additions on the properties of water glass, a binder of moulding and core sands - is the subject of the paper. The nanoparticles of zinc oxide in various suspensions were introduced into water glass and the adhesive properties were examined by measuring the quartz wettability by the binder. The binder-matrix interactions were verified by strength tests of loose self-setting sands with modified binders. The most efficient quality improvement of moulding sands with water glass can be achieved by the binder modification. Multimolecular components such as polyphosphate, polyacrylamide, carboxymethylcellulose, and polyvinyl alcohol have been used up to now as modifiers. They differed in: their polymerisation degree, molecular mass, kind and number of functional groups. The performed investigations of water glass modification by the suspension of ZnO nanoparticles in ethanol and in propanol indicated that strength R_m^u of loose self-setting sands with water glass modified by the suspension of ZnO nanoparticles in ethanol and in propanol (without a chemical hardener) increases when the modifier is added. In the case of adding the modifier in the form of a suspension of ZnO nanoparticles in propanol - sand strength R_m^u increases by approx. 8% (when modifier addition equals 3 mass %) and by approx. 26% (when this addition equals 5 mass %), whereas when the modification is carried out by the suspension of ZnO in ethanol - sand strength R_m^u increases by approx. 18% (when modifier addition equals 3 mass %) and by approx. 12% (when this addition equals 5 mass %).