[article]
| Titre : |
Thermal insulation coatings : Controlling heat flow wxith a functional coating |
| Type de document : |
texte imprimé |
| Auteurs : |
Leo J. Procopio, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 24-31 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Formulation (Génie chimique)
Isolation thermique
Latex
Matériaux -- Propriétés fonctionnelles
Microsphères
Revêtements en phase aqueuse
Revêtements organiques
Sphères creuses
Thermocinétique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Paints and coatings are typically used to beautify and protect, but there are many examples of specialty coatings that serve other functions. The development of these "functional" coatings has been a trend in the industry for many years, and there are numerous examples such as soft-feel coatings for consumer electronic, sound-damping coatings for mitigating noise in automobiles, and antimicrobial coatings designed to kill microorganisms that come into contact with the coated surface.
Another trend in the paint and coatings industry has been the development of coatings that control the use of energy.
Access to energy is an important global driver for economic growth, and how we generate, efficiently use, and ultimately conserve energy has important consequences for the future of our environment and society. Coatings technology has an important role to play in this ongoing struggle. For example, coatings that can be cured at lower temperatures inherently use energy more efficiently.
The replacement of heavier bitumen pads with lightweight liquid-applied sound-damping coatings allows auto manufacturers to remove weight from automobiles. Reducing weight of transportation vehicles uses energy more efficiently and improves mileage. Antifouling coatings help the fuel efficiency of ships by preventing the buildup of biofouling on the hull, which increases drag and makes engines work harder to achieve the same result. Several types of functional coatings are targeted at managing thermal energy. Cool-roof coatings keep the interior of buildings cooler and lighten the load on air conditioning during the hot, sunny days of summer. High solar reflectivity and thermal emissivity helps the coating deflect energy in sunlight, preventing the roof from heating up as much, and thus less heat is conducted through the roof and into the building. Cool coatings for exterior building walls also function in a similar manner. Cool coatings also help defend against the urban heat island effect, where urban environments with large areas of dark roofs and paved surfaces tend to be warmer than nearby rural areas. Thermal insulation coatings are also used to manage thermal energy for both personnel protection and energy conservation purposes. However, thermal insulation coatings rely on a different mechanism and prevent heat transfer between materials due to their low thermal conductivity.
In this article, we introduce thermal insulation coatings and the science behind how they work. First, a discussion on the physics of heat transfer and thermal conduction will provide some necessary context to understand how insulation works. A description of traditional insulation materials and some lingering problems with those materials will give perspective into why thermal insulation coatings were developed, followed by a description of how thermal insulation coatings are formulated, applied and perform. A brief comparison with cool-roof coatings will also be given to clarify common misunderstandings about functional coatings and how they each help with energy management. |
| Note de contenu : |
- Mechanisms of heat transfer
- The science of heat transfer by conduction
- Insulation materials
- Thermal insulation coatings
- Formulation of thermal insulation coatings
- Dispelling myths and misconceptions
- Fig. 1 : Examples of the three mechanisms of heat transfer
- Fig. 2 : Heat transfer by conduction through a bar of material with thermal conductivity k
- Fig. 3 : Comparison of a dark roof and cool white roof for solar reflectivity, emissivity, and heat transfer to the building
- Table 1 : Thermal conductivity (k) of some commonmaterials, and calculated R-value for 1-inch thick slabs of the materials
- Table 2 : Representative formulation for a waterborne thermal insulation coating based on an acrylic latex and hollow glass microspheres |
| En ligne : |
https://drive.google.com/file/d/1gzQkX-Ju6ApJZ0c3eW5bMflCJ5wPaU8A/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37242 |
in COATINGS TECH > Vol. 19, N° 2 (02/2022) . - p. 24-31
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Thermal insulation coatings : Controlling heat flow wxith a functional coating in COATINGS TECH, Vol. 19, N° 2 (02/2022)
