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How Can We Effectively Use Accelerated Methods to Predict the Decorative Properties of PVDF-Based Coatings?: A Practical Approach

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Service Life Prediction of Exterior Plastics

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Abstract

Poly(vinylidene fluoride) (PVDF) resins are the dominant component of some of the most weatherable commercially available decorative coatings. These coatings can have color retention and chalk resistance service lifetimes of decades. We have recently outlined a quantitative service life prediction model for the decorative properties of coatings of this type (Wood K (2009) A quantitative model for the prediction of gloss retention, color change, and chalking for poly(vinylidene fluoride)/acrylic blends. In: Proceedings of 4th European weathering symposium, Budapest, Hungary, Sept 2009). The model is based on the “contraction” theory of gloss loss and chalking, coupled with simple assumptions about the photochemical kinetics of two-resin hybrid systems where one resin (PVDF) is much more weatherable than the other (in this case, an acrylic). Because different mechanisms account for gloss loss, color change, and chalking, the relative rates of change for each of these properties can be different, in accordance with experimental observations. We outline a methodology that uses insights from the model, empirical data from accelerated tests, and long-term weathering test data from solvent-based baked PVDF coatings, to predict the service life of new waterborne no-bake PVDF coatings.

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Notes

  1. 1.

    AAMA is the American Architectural Manufacturers Association, www.aamanet.org.

  2. 2.

    In several studies, we have also found considerable evidence for a contraction mechanism in PVDF-based thermoplastic coatings; see [10].

  3. 3.

    The historical license requirement for KYNAR 500® PVDF specifies a minimum content of 70 wt% KYNAR 500 PVDF on total binder and a minimum of 40 wt% on total coating solids. If the critical PVC is about 50 % and the density for PVDF, acrylic, and metal oxide pigment are about 1.78, 1.18, and 4.5, respectively, it may be calculated that a typical license composition with 60:40 binder:pigment mass ratio will easily meet the critical PVC requirement, the PVC being about 19 % with the acrylic included and 27 % if a weathered surface region with only pigment and PVDF is considered.

  4. 4.

    The glass transition temperatures for PVDF homopolymers and copolymers are in the -40 °C to -30 °C range, permitting considerable mobility of the polymer chains at normal service life temperatures.

  5. 5.

    Two examples are allowing the use of color ranges (without a change in pigment or coating resin) in AAMA 2605 and allowing provisional listing on the AAMA Verified Components List while weathering testing is pending.

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Authors and Affiliations

  1. Arkema, Inc., King of Prussia, PA, 19406, USA

    Kurt A. Wood

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  1. Kurt A. Wood
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Correspondence to Kurt A. Wood .

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Editors and Affiliations

  1. Polymeric Materials Group, National Institute of Standards and Technology, Gaithersburg, Maryland, USA

    Christopher C. White

  2. Montgomery Village, Maryland, USA

    Jon Martin

  3. Underwriters Laboratories Inc., Northbrook, Illinois, USA

    J. Thomas Chapin

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Wood, K.A. (2015). How Can We Effectively Use Accelerated Methods to Predict the Decorative Properties of PVDF-Based Coatings?: A Practical Approach. In: White, C., Martin, J., Chapin, J. (eds) Service Life Prediction of Exterior Plastics. Springer, Cham. https://doi.org/10.1007/978-3-319-06034-7_5

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  • DOI: https://doi.org/10.1007/978-3-319-06034-7_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-06033-0

  • Online ISBN: 978-3-319-06034-7

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