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USING A CLIMATE CONTROLLED APPLICATION CHAMBER TO UNDERSTAND COATING DYNAMICS

USING A CLIMATE CONTROLLED APPLICATION CHAMBER TO UNDERSTAND COATING DYNAMICS
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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.

Product Number: 51218-101-SG
Author: Douglas Corrigan, Chris Lucy, Edye Fox Abrams
Publication Date: 2018
Industry: Coatings
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$20.00
$20.00

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.

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.

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