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Since the 1980s, fluoropolymer resin technologies have offered the possibility of a quantum improvement in topcoat decorative properties- gloss and color retention- compared to conventional acrylic and polyester resins. Specifiers of both protective and architectural restoration coatings systems have expressed a need for a new SSPC standard for field-applied fluoropolymer topcoats, particularly for bright and saturated colors.
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We studied the corrosion resistance for topcoat systems made using a solvent-borne 2K fluoroethylene vinyl ether (FEVE) polyol blended with different acrylic resins. The topcoats were applied over primed steel substrates. The primers consisted of zinc-rich (for 2-coat) and zinc-rich/epoxy mid-coat (for 3-coat) systems. Standard, salt fog (ASTM B 117), cyclic Prohesion (ASTM G85 Annex A5) and EIS (electrochemical impedance spectroscopy) test methods were used to determine corrosion resistance. The blended system performance was compared against FEVE, acrylic, polyurethane, and polysiloxanes controls.
A test protocol was developed to provide an assessment of the effects of various film defects as well as to perform post-exposure qualitative and quantitative evaluations on eight different coatings systems.
A building, partially clad in fluoropolymer coated aluminum panels, was observed to have an aesthetically unacceptable appearance while still under construction. Once installed on the building, many of the panels exhibited a vertical streaked appearance under certain conditions. When the panels were at ground level, or when the sun was bright, the streaky appearance was not noticeable. However, in conditions of low light, such as during early morning, dusk, or on cloudy days the streaky appearance was reported to become apparent. A visual mock-up, consisting of multiple coated panels that had been approved by the architect as a guide to the anticipated appearance were also present on-site as a reference. This visual mock-up was used as a reference for acceptable appearance of the coated panels.
It was requested that exposure testing be completed on various high durability coatings products to evaluate gloss retention and color changes. Various systems were chosen to test, some with clear coats and some without. They were placed in cyclic UV/condensation testing, concentrated natural sunlight testing in Arizona, and outdoor exposure testing in South Florida.
Highly durable fluoropolymer coatings also generally have very good “stay-clean” properties. For this class of coatings, many of the factors contributing to stay-clean properties and exterior durability are linked. We will review these factors and examine particularly their role in affecting the properties of coatings based on the new waterborne fluoropolymer-acrylic hybrid technology. Using these principles, realistic estimates of the service life of these premium coatings can be determined.
Pigment and additive choices are crucial in getting good results when adapting fluoropolymer formulations for specific application requirements. This presentation will explore some specific case studies showing how paint formulation principles were applied to achieve superior coating performance for targeted substrates and application conditions.
This paper considers the environmental and financial impact of various antifouling coatings for ships hulls. To do this comparison an eco-efficiency analysis was conducted comparing three different fouling control systems which offer the same customer benefit of a clean underwater hull. The results clearly demonstrated that fluoropolymer foul release technology can offer this benefit in the most eco efficient way having lower impacts on both the environment and on the economics of using that technology.
The exterior metal of the 777 South Flagler Drive office building in West Palm Beach Florida was tired and worn when the owner decided to renew the project. They had over the years, tried conventional products without the desired long term result. That is when they called in a specialty exterior metal coatings applicator and a coatings company that has both a proven product and track record of long term exterior coatings and glass products.
Caretakers of outdoor monuments, sculptures and high-value architectural metalwork face formidable preservation challenges. Durable, low-maintenance coatings are needed that provide longer-lasting protection against corrosion and degradation, while being safe for the environment. We describe work done in collaboration with conservators at the Philadelphia Museum of Art, and Portland State University, to develop water-based fluoropolymer coatings that meet the critical needs of the conservation and architectural communities.
High performance fluoropolymer resin systems for coatings applications have been commercially available for years. These technologies provide the owner a coating system that will far outperform other coatings in terms of exterior performance, most notably in chalk and fade retention. This paper will discuss the chemistry of the two primary types of fluoropolymer resins utilized in the protective and architectural coatings markets and explore the mechanisms by which they provide improved exterior durability. Additionally, the benefits of fluoropolymer coatings will be explored in specific applications.