Ti02 epoxy coating

The direct and indirect effects of fillers oti the photostability of polymer compositions are well known. With the recent interest in nanopowdered fillers reports of their effectiveness as photostabilizers is beginning to be reported in the literature. For instance ZnO and Ti02 nanoparticles (primary particle size 25-70 nm) were studied in acrylic coatings. A layer that carried at least 5 weight percent of the nanoparticles was needed to shield the underlying layers from UV exposure and hence degradation [162]. Nanoscale titania was also evaluated as a stabilizer in epoxy coatings [163]. 

Figure 44.7 Uncoated MgZK30 metal together with the one exposed to 0.5 M NaCI for 1 month in water and the other coated with an epoxy coating containing Ti02-MBT-loaded nanocontainers.

Titanates are valuable in other paint applications. Corrosion-resistant coatings have been described for tinplate, steel, and aluminum (440—444). Incorporation of phosphoric acid or polyphosphates enhances the corrosion resistance. Because titanates promote hardening of epoxy resins, they are often used in epoxy-based paint (445). Silicones (polysiloxanes) are often cured by titanates. Pigments, eg, Ti02, Si02, Al O and Zr02, are frequently pretreated with titanates before incorporation into paints (441,446). In these applications, the Ti(OR)4 compounds are often mixed with Si(OR)4, Al(OR)3, Zr(OR)4, and other metal alkoxides (12). 

Al-Turaif HA. Effect of nano Ti02 particle size on mechanical properties of cured epoxy resin. Prog Org Coat 2010 69(3) 241-6. 

Schuler M, Kunzler TP, De Wild M, Sprecher CM, Textor M, Brunette DM, Tosatti SGP. Fabrication of Ti02-coated epoxy replicas with identical dual-type surface topographies for use in cell culture assays. J Biomed Mater Res 2006 submitted for publication. 

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