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Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I

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Abstract

A recently developed xenon arc-based accelerated weathering cycle, ASTM D7869-13, has been validated for automotive and aerospace coatings, but its ability to predict the gloss and color retention of premium architectural finishes has not yet been evaluated. We review new weathering data comparing the performance of poly(vinylidene fluoride) (PVDF) architectural finishes in south Florida exposure as well as several accelerated exposure methods including ASTM D7869-13. ASTM D7869 accurately reproduced Florida rank order gloss and color retention trends for coatings made with PVDF-acrylic blends and inorganic pigments, as well as the gloss and color changes seen in Florida for 70% PVDF masstone coatings made with a number of single organic pigments. However, the D7869 cycle has difficulty predicting the rank order of rutile TiO2 grades for the gloss retention of PVDF coatings in Florida, as well as the magnitude and direction of color fade from organic pigment degradation in organic pigment/inorganic pigment blends. One open question that remains is whether the ASTM D7869 cycle might have some utility for industry standard or specification purposes, if the test is limited to specific reference colors or more ideally to specific reference pigments.

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Notes

  1. Available from the American Architectural Manufacturers Association, www.aamanet.org. See also Lewis [7].

  2. The latest edition of the Qualicoat standards, the 14th, eliminates an earlier option of using UVA-340 fluorescent testing to qualify the highest weatherability coatings. See http://www.qualicoat.net/main/specifications.html.

  3. KYNAR 500® PVDF for architectural finishes was launched by the Pennsalt Company in 1965. Since that time, it has been sold exclusively under a license program which requires use in the finish coat of 70 wt% PVDF minimum on total binder weight, and 40 wt% on total solids weight.

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  1. Arkema, Inc., 900-1st Avenue, King of Prussia, PA, 19406, USA

    Kurt Wood

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Correspondence to Kurt Wood.

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KYNAR 500® and KYNAR Aquatec® are registered trademarks of Arkema, Inc.

The statements, technical information and recommendations contained herein are believed to be accurate as of the date hereof. Since the conditions and methods of use of the information referred to herein are beyond our control, Arkema expressly disclaims any and all liability as to any results obtained or arising from any reliance on such information; NO WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, WARRANTY OF MERCHANTABILITY, OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED, IS MADE CONCERNING THE INFORMATION PROVIDED HEREIN. The user should thoroughly test any application before commercialization. Nothing contained herein constitutes a license to practice under any patent and it should not be construed as an inducement to infringe any patent, and the user is advised to take appropriate steps to be sure that any proposed action will not result in patent infringement.

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Wood, K. Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I. J Coat Technol Res 15, 933–943 (2018). https://doi.org/10.1007/s11998-018-0050-y

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