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Highly engineered PVDF (polyvinylidene fluoride) based coatings have evolved over the years to meet the specific requirements of market segments. Over 50 years ago, high temperature-baked PVDF based finishes were introduced to the architectural community to protect the metal components of skyscrapers, stadiums, and other landmark structures. The multi-decade service life and extreme weatherability of these coatings is attested to by outdoor Florida exposure and demonstrated by performance on structures worldwide.
Highly engineered PVDF (polyvinylidene fluoride) based coatings have evolved over the years to meet the specific requirements of market segments. Over 50 years ago, high temperature-baked PVDF based finishes were introduced to the architectural community to protect the metal components of skyscrapers, stadiums, and other landmark structures. The multi-decade service life and extreme weatherability of these coatings is attested to by outdoor Florida exposure and demonstrated by performance on structures worldwide. Solvent borne “airdry” PVDF systems for field applied touch-up, repair, and restoration were developed in the 1980s. This technology has also demonstrated more than 20 years of excellent south Florida colour retention in those regions of colour space where weatherable inorganic pigments are available. Similarly, waterborne PVDF coating systems development followed. These air-dry or low temperature bake cure systems, have now surpassed 15 years of excellent weatherability in Florida. Recent advances in understanding the dynamics of weathering in PVDF-based coatings, based on extensive south Florida exposure data, indicate the way to attain 20-year colour lifetimes for both solvent and waterborne field-applied PVDF-based topcoats, even for some “bright colour” regions of colour space where organic pigments must be used. These findings are relevant not only to the restoration coatings market, but also to many segments of the protective coating market.
The author will present on the various generic coatings technologies available for lining concrete and discuss the advantages and disadvantages of each one. Discussion will include epoxy, polyurethane and polyurea technologies. The goal of the presentation will be to provide some guidance to the attendees on when is the right application to select each technology as part of a specification.
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This paper will present the results of an inspection conducted in 2007, nominally 20 years after the initial coating application. The inspection showed varied service lives associated with the different coating systems. Some of the systems were in excellent condition after 20 years while others had completely broken down.
This is the final paper in a series of papers that discusses weathering performance of 2-component (2K) polyurethane topcoats used in corrosion protective coatings applications, e.g., bridges, marine, stadiums, etc., with emphasis on the key formulating variables affecting performance.