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The use of TiO2 -polymer composites to lower environmental impact and improve performance of waterborne paints

Trapani A., Bleuzen M., Kheradmand H., Koller A., Zukowski L.

Farby i Lakiery

2013

nr 5

8--18

The hiding of conventionally formulated waterborne paints depends on a complex set of factors including the level of TiO2 , the type and levels of extenders, and the interactions of the polymer and pigment particles with other paint additives. Replacing the conventional TiO2 with in-situ formed TiO2 -polymer composites is found to yield a more uniform, less crowded distribution of TiO2 particles in both the dry and wet paint films. This effectively enhances the scattering efficiency of the TiO2 in the coating which can lead to lower pigment use levels and associated cost reductions. TiO2 use levels in these systems can be reduced by up to 20% while maintaining the opacity and tinting strength of the original coating. The mineral-polymer composite material is created under usual paint-making conditions using a dispersion polymer pre-composite and standard paint grades of TiO2. Forming a paint film from such composites ensures that the dry film structure is closer to the optimally desired architecture where each mineral particle is completely bound by polymer. The resulting film provides better barrier properties than one obtained from a traditionally formulated paint. The improvement in performance can manifest itself as improved efflorescence resistance, improved stain resistance, improved UV resistance, improved outdoor durability, etc. In most cases, the improvements in film properties will result in an extended service life for the coating and the article to which it is applied. A lifecycle assessment (LCA) of composite-based paints as compared to traditional paints was completed in accordance with ISO 14040 and 14044 (2006). This LCA was peer-reviewed and validated by a third-party auditor. Environmental indicators such as Green-House Gas Effect, Primary Energy Consumption, Resource Depletion, etc. were calculated over the full lifecycle for several painting schemes. The paints based on this new composite technology demonstrated reduced environmental impacts which can be directly traced back to their lower TiO2 content and improved film properties.