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Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation

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Abstract

The degree of UV protection afforded by nano-ZnO in a polyurethane/acrylic clear topcoat was investigated. The influence of nano-ZnO concentration and dry film thickness on the optical properties (e.g., UV permeability and visible transmittance) of the coating was probed using a library of 28 samples that were prepared by high throughput techniques. A model for predicting the UV permeability of nano-ZnO filled coatings was developed and the nano-ZnO loading condition required to block >99% UV radiation was determined to be 2.0 g/m2. This model can be used to assist in the development of coatings and other polymeric systems embedded with nano-ZnO to protect the coating and underlying materials (i.e., substrate) from UV degradation.

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Notes

  1. Perkin Elmer liquid handling instrument. Perkin Elmer, Shelton, CT.

  2. FISHERfinest Premium microcroscope slides, Fisher Scientific, Pittsburgh, PA.

  3. Nano-ZnO containing polyurethane/acrylic clearcoat on an epoxy clearcoat, 4000 h QUVA exposure: 4 wt% ZnO (l dry = 1.7 mil) = slight yellowing of epoxy; 7 wt% ZnO (l dry = 1.7 mil) = little-to-no yellowing of epoxy.

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Acknowledgments

The authors gratefully acknowledge G. L. Johnson (APCI) for his support and thought-inspiring discussions as well as J. R. Stets (APCI) for performing SEM. We also acknowledge M. D. Buzinski (APCI) for constructing equipment that enabled the completion of this work.

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Authors and Affiliations

  1. Air Products and Chemicals, Inc, Allentown, PA, 18195, USA

    Michael S. Lowry, David R. Hubble, Amy L. Wressell, Menas S. Vratsanos, Frank R. Pepe & Charles R. Hegedus

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  1. Michael S. Lowry
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  2. David R. Hubble
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  3. Amy L. Wressell
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  4. Menas S. Vratsanos
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  5. Frank R. Pepe
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  6. Charles R. Hegedus
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Correspondence to Michael S. Lowry.

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Lowry, M.S., Hubble, D.R., Wressell, A.L. et al. Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation. J Coat Technol Res 5, 233–239 (2008). https://doi.org/10.1007/s11998-007-9064-6

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