Exterior surface coatings used in many applications can be exposed for long periods of time to cyclic exposure consisting of water submersion or local water surface puddling followed by water evaporation and solar exposure. Under such conditions, several macroscopic defects can appear including blistering, adhesion loss, soil pick-up, cracking, erosion, etc. However, quite often surface microscopic film defects can start...
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Despite growing interest around the world in the use of concrete and composite materials, wood remains widely used in exterior architectural applications, including siding, decking, fencing, and similar applications. Coatings continue to play an important role in maintaining the appearance and protecting the integrity of wood. “Exterior wood has conveyed quality and beauty for centuries, but that beauty requires significant...
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The coating system almost always is blamed for field defects, but there are other possibilities: design of the painted object, poor substrate quality or surface preparation, and the process, including application and cure. Was the painting done in the sun? Or in the rain? Were the freshly painted rail cars pushed out into fog? Were all the required coats applied?...
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Experimental To increase the performance of a 1KWB PU to the level of a 2KWB PU, an intensive development program was undertaken. Its goal was to develop a 1KWB PU with higher film hardness (e.g., >2H pencil gouge hardness) and with superior chemical resistance (e.g., detergent, nitric acid, and mortar). The study examined various kinds of high molecular weight polyol,...
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The development of an effective waterborne technology for exterior paints has become a significant challenge in the architectural coatings market due to the growing expectations of end users (total cost of ownership), diversification of materials used for exterior walls and siding, and the continuous trend towards VOC reduction. This article describes a new product based on our company’s Low Exudation...
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Professional and do-it-yourself (DIY) painters increasingly care about efficiency—reducing the time and labor involved in painting surfaces. Paints with paint and primer in one capabilities help reduce the time and labor of painting jobs, so developing a polymer that provides both primer and topcoat properties is necessary, but also challenging. This objective further raises the performance requirement for the exterior...
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Architectural coatings account for a significant percentage of the volume and value of the overall paint and coatings market. The global exterior architectural coatings market alone is predicted to reach $39.04 billion by 2024, according to U.S.-based market research and consulting firm Grand View Research. North America accounted for 22.6% of the global volume share in 2015 and is expected...
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by Cynthia Challener, CoatingsTech Contributing Writer
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