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Solventborne alkyd resins are widely used in industrial coatings because of their excellent gloss, good adhesion and wetting properties as well as excellent compatibility with other resin types. In many regions, however, the consumption of alkyds is diminishing as stringent environmental regulations drive the coatings industry towards lower volatile organic compound (VOC) systems. Waterborne (WB) coating systems have replaced some solventborne (SB) alkyd paints; however, these WB coatings typically do not offer the same performance as their solventborne counterparts.
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With a history of proven performance in architectural and industrial coatings and the ability to adhere to less-than-ideally prepared substrates, alkyd resins have remained at the forefront of coating technology for well over 50 years. With such an established history, alkyds are often thought of as old technology and synonymously associated with flammable solvents and high levels of volatile organic compounds (VOC). These historical associations are not the contemporary story.
A formulated nanoparticle dispersion increases the cross linking of waterborne protective coatings without reducing the formula shelf life. Among the cross linking-related improvements are MEK rub resistance, humidity and immersion resistance, tensile strength and blocking resistance. The findings are in accord with a non-covalent mechanism of cross linking.
Coatings are utilized in a wide variety of applications (floor, wall, roof, etc.) and on many different substrates (concrete, steel, drywall, etc) in commercial architectural settings, and performance requirements will obviously vary depending on the intended use and environment.
Coatings are constantly being asked to go to greater extremes, such as lower VOC and higher performance. This paper will discuss coating technologies that are being asked to go beyond the typical protective and aesthetic aspects of coatings and offer other functions. Several types of waterborne functional coatings will be described, including technologies for combating noise, heat, and air pollutants.