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Thermal insulation coatings : Controlling heat flow wxith a functional coating / Leo J. Procopio in COATINGS TECH, Vol. 19, N° 2 (02/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 2 (02/2022) . - p. 24-31 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 [article]

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Waterborne epoxy coating / Adrian Potts in COATINGS TECH, Vol. 19, N° 2 (02/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 2 (02/2022) . - p. 33-38 Titre : Waterborne epoxy coating : Lifting performance for tomorrow Type de document : texte imprimé Auteurs : Adrian Potts, Auteur Année de publication : 2022 Article en page(s) : p. 33-38 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Dispersions et suspensions Epoxydes Essais (technologie) Essais de brouillard salin Formulation (Génie chimique) Granulométrie Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Nanoparticules Revêtements en phase aqueuse Revêtements en phase aqueuse -- Additifs Rhéologie Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Graphene as a two-dimensional nanomaterial has been extensively researched as a new additive to improve barrier performance, reduce corrosion and extend service life in protective coatings. Previous results have demonstrated significant uplifts in anticorrosive performance in solvent-based coatings using graphene nanoplatelets (GNPs), presenting new opportunities for improved protective coatings with extended service life. However, water-based coating development remains a key focus for industry formulators where there is an ongoing effort to reduce the release of volatile organics and achieve comparable anticorrosion performance to that seen in solvent-based systems. To date, dispersion of graphene in water-based systems has been problematic, causing coating instability or requiring large amounts of surfactant. A breakthrough technology has been developed that enables easy dispersion in water-based coatings while delivering improved corrosion performance. This development provides an important step to raising waterborne coatings' anticorrosion performance and use. Note de contenu : - EXPERIMENTAL PROCEDURE : dsispersion development and testing - Material & sample preparation - RESULTS : Dispersion particle size - Rheology - Turbiscan analysis - Neutral salt spray testing - Electrochemical Impedance Spectroscopy (EIS) En ligne : https://drive.google.com/file/d/1umcB67xewrll3ERDI0HUtAPcr-qq123I/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37243 [article]

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Automated dynamic testing for drying, hardness, and adhesion of paints, coatings, and adhesives / Ronald T. Obie in COATINGS TECH, Vol. 19, N° 2 (02/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 2 (02/2022) . - p. 40-59 Titre : Automated dynamic testing for drying, hardness, and adhesion of paints, coatings, and adhesives Type de document : texte imprimé Auteurs : Ronald T. Obie, Auteur ; Cameron R. Anderson, Auteur Année de publication : 2022 Article en page(s) : p. 40-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Séchage Adhésion Essai de dureté Essais dynamiques Revêtement -- Séchage Revêtement -- Séchage:Peinture -- Séchage Revêtement en phase solvant Revêtements en phase aqueuse Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Characterization of dry and cure is very important in the development of paints, coatings, and adhesives. It can be challenging to assess dry and cure of these products on a quantitative, non-biased basis. Although there are many different techniques utilized to assess drying, curing, and performance, some are often qualitative at best. It would be useful to have quantitative techniques available to access these properties. In this paper, we introduce a novel automated dynamic dry time recorder (ADDTR) device that measures dry and cure of coatings similar to mechanical dry time recorders that meet ASTM Method D 5895. The novel device is capable of recording and graphically displaying the coating drying profile as it dries so that drying time events may be easily identified, archived, and analyzed, even for clear coatings. Such analysis allows easy and quantitative comparison between different coating systems, chemistries, driers, etc. In certain configurations, the tester may also be utilized as a hardness, toughness, and adhesion tester. Note de contenu : - Drying time determination - Solvent-based coatings - Drying time determinationa - Water-based coatings - Hardness testing of films En ligne : https://drive.google.com/file/d/1jS37p5GhUTprXBX57mpbyIctul1kid2w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37244 [article]

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Coatings Tech Vol. 19, N° 2 URL