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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.
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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.
Traditionally, the light industrial/general maintenance paint systems involved a primer along with multiple coats of acrylic finish paint to achieve acceptable corrosion resistance over mild steel substrates. The new Direct-To-Metal (DTM) acrylic paints are formulated to eliminate the primer and perform as a primer and as a tough finish coat in a single paint, reducing the time and materials needed for complete coverage
Achieving high performance with waterborne acrylic latex DTM coatings often requires a balancing act to be performed by both the polymer scientist designing the latex polymer and the coating scientist formulating the coating. A successful coating is defined by a set of critical properties while in the paint can, during application, and ultimately in its performance throughout its service life.
Lowering the volatile organic content (VOC) of industrial coatings has become a requirement in many reformulation and new coating development efforts, oftentimes in order to meet increasingly strict regulations. Driving VOC to lower levels and performance to higher levels can also offer a more sustainable coatings solution for the end-user. Lowering VOC and maintaining (or improving upon) high performance is often the goal when developing a new formulation, but the two objectives can be at odds with each other.
Today, the push to find more environmentally friendly solutions for paints and coatings has become very important. Paints contain volatile organic compounds (VOCs), that contribute to ground level ozone and smog and can be harmful to human health and air quality. VOC limits for formulated coatings have been instituted by local governments to meet the highest air quality standards. One such regional regulation set a limit of 100 g/L for industrial maintenance coatings in the South Coast Air Quality Management District (SCAQMD) of Southern California in 2007.
The protection of commercial buildings from the elements is a major function of the coatings used in new build and maintenance applications. Waterborne elastomeric acrylic coatings represent an important category of coatings used in both residential and commercial architectural painting.
This paper is a case study on a 100% solids epoxy penetrating sealer being used as a tie coat between a tightly adhered latex acrylic and aliphatic polyurethane.
A new acrylic epoxy hybrid (AEH) water based dispersion has been developed for two-components coating applications for several years. This new AEH dispersion can be used to replace the conventional water based epoxy dispersions for concrete and metal coatings. The curing agent selection for the new AEH dispersion is critical for metal applications for both formulation stability and the performance such as corrosion resistance, water resistance and UV durability. This paper discusses the utility of using ζ-potential and water solubility in curing agent selection.
An escalating amount of negative press on the tried-and-true polyurethane finish coats has arisen due to concerns with their free-isocyanate content. This paper explores performance aspects of polyurethanes with respect to their UV resistance properties, and safety issues associated with polyurethanes as a function of their precursor isocyanate molecules.
Traditionally, a zinc-rich primer, epoxy midcoat and polyurethane topcoat have been the standard 3-coat solvent borne system used for coating structural steel, such as in the maintenance of bridges. This study describes the performance of waterborne acrylic coating systems in an accelerated testing protocol including corrosion resistance and cyclic weathering. A comparison of systems based solely on waterborne acrylic coatings, as well as hybrid systems (e.g., zinc rich primer with waterborne topcoats), to the industry standard will be discussed.
Current and impending environmental regulations are leading to the development and use of new technologies in a variety of marine and protective coatings applications. Among the various challenges presented to the coatings industry, the desire to decrease the level of volatile organic compounds (VOCs) in traditional solventborne coatings ranks among the most prevalent.