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The primary application for coatings made with Fluoroethylene vinyl ether (FEVE) resins has been in architectural markets. This paper will discuss the chemistry and physical characteristics of FEVE resins, including data on weatherability. A brief review of FEVE resin product types will be given. Both laboratory and offshore corrosion test results will be addressed.
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Fluoroethylene vinyl ether (FEVE) resins were developed to overcome some of the problems associated with the use of fluoropolymers in coatings. These resins, which yield topcoats with lifetimes exceeding 60 years, can be cured at ambient temperatures for field applications, or at elevated temperatures in the shop. New FEVE resins have been developed to enable formulators to meet air quality regulations while still producing coatings with excellent durability.
Fluoroethylene-vinyl ether (FEVE) resins were developed in the early 1980’s. These thermoset solution fluoropolymer resins are used to make highly durable, weatherable, and corrosion resistant air-dry coatings. Applications are found in architectural, industrial, automotive, and aerospace markets, and in infrastructure coatings for bridges, oil rigs, and water towers.
Electrochemical impedance spectroscopy (EIS) is used to evaluate the influence of a topcoat to impact corrosion protection after accelerated exposure testing (QUV, xenon arc, Prohesion). The ability to monitor early undercoat corrosion, at progressive stages of the accelerated weathering tests, was a major factor in selecting the EIS testing method.
Performance, cost, and safety drive the coatings industry. Safer and environmentally friendly coatings continue to be a hot topic of discussion globally; however, the adoption of greener coating technologies is slow, especially in the US. This could be attributed to many factors, but from the formulator's perspective, performance is key. Waterborne coatings have been used in architectural applications for decades, but typically these coatings are valued mostly for aesthetics, ease of use, and low cost.
Performance properties of solvent-based urethane topcoats formulated with fluorinated polymers are reviewed. Fluoro-urethanes offer outstanding gloss and color retention, good chemical resistance, and excellent adhesion. The long coating service life of fluoro-urethanes reduces the frequency of maintenance work and subsequent downtime interruption.
The California Dept. of Transportation (Caltrans), Standard Green Finish Paint (PWB-172B) was introduced in February 2006 because of changes to Volatile Organic Carbon (VOC) regulations in the South Coast Air Quality Management District (SCAQMD). In 2014, Caltrans decided to update the coating formulation, seeking to provide better performance properties.
Fluorourethane coatings based on FEVE, fluoroethylene vinyl ether chemistry, have been used globally for over 30 years. This technology has a proven record of outstanding performance against exposure to the elements and has been used in applications ranging from aerospace to architectural structures. Recently, the bridge market has taken notice of this high performance, especially in harsh marine environments. Resistance to degradation by UV light is important to the longevity of a bridge structure, but it could be argued that corrosion resistance is the key performance indicator for a protective topcoat.
Fluoropolymer resins find widespread use as building blocks for ultra-weatherable coatings. Fluoroethylene vinyl ether (FEVE) resins were developed to overcome some of the problems associated with the application of standard fluoropolymer coatings. FEVE resins, which yield topcoats with expected lifetimes exceeding 60 years, can be cured at ambient temperatures for field application, or at elevated temperatures in the shop. In order to allow coating manufacturers to conform to government regulations on solvents, water-based FEVE resins were developed several years ago.