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Znoj B.,Helios Group | Vince J.,Helios Group | Steinbucher M.,Helios Group | Znidarsic A.,Kolektor Nanotesla Institute Ljubljana | Venturini P.,Helios Group
Materiali in Tehnologije | Year: 2012

Titanium dioxide (Tio 2), in the crystal form of rutile with high refractive index, 2.7, is one of the most important inorganic pigments. In the recent years nano Tio 2 has attracted interest as an inorganic material for nanocomposites. It is used for the development of photocatalysts 1,2, semiconductors in solar cells 3,4 and for the protection of materials from UV damage 5-8. To achieve high UV absorbing efficiency of Tio 2 nanoparticles into polymer matrix and to yield a better compatibility with polymeric materials surface treatment of Tio 2 nanoparticles with 3-glycidyloxypropyltrimethoxysilane (GLYMO) in a polyacrylic clear coating was investigated. The grafting of GLYMO on the Tio 2 nanoparticles surface was characterized with TGA and FTIR techniques. The stability of Tio 2 nanoparticles in a acrylic clear coating was evaluated by zeta potential measurement. Microstructural analysis of nanoparticles was done by SEM and the influence of surface treatment on stability of nanoparticles in dispersion and acrylic coating was analysed. Finally the UV absorption effectivness of acrylic clear coating with treated nanoparticles of rutile Tio 2 was measured to determine the effect of improved dispersion. The performance of nanocomposite coatings was demonstrated trough accelerated weathering by gloss measurement. The results showed that surface treatment of Tio 2 nanoparticles with GLYMO improves nanoparticles dispersion and preserves UV protection of the acrylic clear coating.

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