Silicone/silica nanocomposites as culture‐stone protective materials

Abstract

The water absorption ratio of the cementbased material culture stone was reduced obviously by the addition of composite additives of silica AS-40 with a nanoparticle size, hydroxyl polysiloxane emulsion, and waterbased methyltrimethoxysilane (MTMS); its surface exhibited hydrophobicity and a certain acid resistance. Furthermore, both of the culture stones treated by two hybrid coatings prepared from the sol-gel reaction of tetraethoxysilane (TEOS) with MTMS and TEOS with MTMS and octyltrimethoxysilane (OTMS), respectively, showed excellent water repellence, long-term contamination resistance, and good acid resistance; particularly, the culture stone treated by the coating from the OTMS precursor displayed better surface hydrophobicity. On the other hand, both the water-based additives and the two hybrid coatings were characterized by Fourier transform infrared spectroscopy and transmission electron microscopy. The sol-gel reaction coatings of TEOS with MTMS and OTMS were also characterized by 29 Si-NMR. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 125: E282-E291, 2012

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