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Application and curing dynamics of paints are rarely quantified over a wide range of varying climactic conditions; yet this information is critical to the final performance of the coating. There is a growing need among raw material suppliers, formulators, and applicators to better understand the performance of products under the extreme humidity and temperature conditions experienced during application.
Application and curing dynamics of paints are rarely quantified over a wide range of varying climactic conditions; yet this information is critical to the final performance of the coating. There is a growing need among raw material suppliers, formulators, and applicators to better understand the performance of products under the extreme humidity and temperature conditions experienced during application. Both humidity and temperature play a large role in fluid dynamics related to the spray stream, the formation of the film on the substrate surface, the curing dynamics, and the final performance of the cured film. Under low humidity conditions, water evaporates from the spray droplet in transit, causing the solids content, droplet size, and surface tension of the droplet to change throughout its transport from the spray nozzle to the substrate surface. Under these extreme conditions, coalescence and formation of a continuous film is problematic. Also, under very low humidity conditions, the surface can cure too rapidly, causing a skin to form which interferes with the curing dynamics of deeper layers. Under very high humidity conditions, waterborne coatings experience much longer curing timeframes, while some solvent-borne coatings can experience a variety of different types of film defects. In this paper we discuss the need throughout the different industry sectors to better understand climactic performance on application performance, the physics and chemistry of how climactic conditions impact the final coating, and the development of a new spray chamber that is designed to test the application and curing performance of coatings over a large range of humidity and temperature conditions.
This summary is a look at implementable work and a gage of the value of future work. The strategic implementation of Surface Preparation and Coatings Automation, Standardization and Digitization of Visual Inspection, and Surface Preparation and Coatings Training Certification Program could provide cost and schedule savings. Optimizing Power Tool Surface Preparation potentially will increase Shipbuilders safety, while reducing material and labor costs.
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Water, steam, and waterjetting have long been used in the conservation of historic artifacts and structures such as the R.M.S. Titanic and the Saturn V Rocket at Johnson Space Center. Integral to the conservation is the removal of loose material, reduction in salts and corrosion, retention of coatings and desirable patina, and repair of damaged areas.
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