Dépouillements

Hollow thermoplastic microspheres in elastomeric cool roof coatings / Jan Nordin in COATINGS TECH, Vol. 16, N° 1 (01/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 1 (01/2019) . - p. 20-27 Titre : Hollow thermoplastic microspheres in elastomeric cool roof coatings Type de document : texte imprimé Auteurs : Jan Nordin, Auteur ; Olof Sandin, Auteur ; Peter Greenwood, Auteur Année de publication : 2019 Article en page(s) : p. 20-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elastomères Isolation thermique Microsphères Réflectance Réflectivité thermique Sphères creuses Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Toiture -- Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Hollow ultra-low density thermoplastic microspheres can be used as filler in elastic waterproof/cool roof coatings to improve a number of important properties of the coatings. Micron-sized hollow microspheres have a surprisingly strong effect on reflecting solar radiation and reducing the temperature of cool roof coatings. Results from solar reflectance measurements show that the coating system filled with hollow microspheres reflects solar radiation of all incoming wavelengths. Hollow microspheres can be combined with reflecting pigments, making it possible to formulate coatings with extremely high values for total solar reflectance (TSR). Dirt pick-up resistance (DPUR) is not significantly affected by the choice of filler for the formulations evaluated here. This article presents convincing results that DPUR can be drastically improved by adding surface modified silica nanoparticles to the formulations. The silica nanoparticles tend to migrate to the coating surface and affect both the surface energy and the tackiness of the surface. Adhesion to steel surfaces is significantly improved by exchanging the inorganic filler for thermoplastic hollow microspheres. This effect is true for both wet and dried coatings and will help improve the water-proofing properties of the coating. It is likely that the thermoplastic properties of the hollow fillers count for part of this effect. Note de contenu : - Fig. 1 : Solar energy distribution. About 5% of the incoming energy is found in the UV-region, 43% in the visible region, and some 52% is found in the near-IR region - Fig. 2 : Spectral reflectance measurements on aged coatings (dry thickness O.8 ± 0.05 mm) filled with 37 vol % CaCO3, 18.5 vol % CaCO3 and 18.5 vol % hollow microspheres, and 37 vol % hollow microspheres - Fig. 3 : Total solar reflectance (TSR) from Fig. 2 (initial and post aging) - Fig. 4 : Effect of dirt pick-up for carbon black after rinsing with water - Fig. 5 : Effect of dirt pick-up for carbon black after rinsing with soap and water - Fig. 6 : Effect of dirt pick-up for red iron oxide after rinsing with water - Fig. 7 : Effect of dirt pick-up for red iron oxide after rinsing with soap and water - Fig. 8 : Adherence and wet adherence of coatings on galvanized steel - Table 1 : TRS and brightness - Table 2 : Formulations - Table 3 : Dirt pick-up by coatings (red iron oxide and black carbon) - Table 4 : Adherence and wet adherence for coatings on galvanized steel En ligne : https://drive.google.com/file/d/10SyHz10U-DI6omB1IYs-sDzdVvzkCX6d/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31806 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20503	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The National Coil Coating Association’s Color Experiment : Potential for converting to CIE color space and deltaE 2000 / David A. Cocuzzi in COATINGS TECH, Vol. 16, N° 1 (01/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 1 (01/2019) . - p. 28-38 Titre : The National Coil Coating Association’s Color Experiment : Potential for converting to CIE color space and deltaE 2000 Type de document : texte imprimé Auteurs : David A. Cocuzzi, Auteur Année de publication : 2019 Article en page(s) : p. 28-38 Langues : Américain (ame) Catégories : Analyse des données Coil coatings Colorimétrie Evaluation visuelle Index. décimale : 667.9 Revêtements et enduits Résumé : Over the decades, the North American coil coating industry has depended on the use of Hunter color space to measure and control color. The National Coil Coating Association (NCCA), now in its 57th year, recognizes that many others are using CIE* color space for day-to-day color control, and that ΔE 2000 is considered a superior methodology to describe color difference, rather than ΔE Hunter. After using Hunter color space for nearly 60 years and relying on the opponent-color-theory coordinates ΔL, Δa, and Δb for color control and ΔE Hunter to define exterior weathering performance, one can assume that the current methodology is suitable, otherwise color issues would abound. But what if using CIE color space and ΔE 2000 is a better approach ? This article discusses the experiment that NCCA ran to evaluate the potential advantages of CIE color space and ΔE 2000. Note de contenu : - EXPERIMENT : WARRANTY CONSIDERATIONS AND COLOR CONTROL : Warranty considerations - Color control along the prepainted metal value chain - DATA ANALYSIS : Comparison of each observer's score vs the average score of the group - Evaluation of each observer's level of repeatability - Evaluation of the scores given to the identical pairs of panels - Determination of the group's average rating of each panel, and representation of these average values plotted against ΔE 2000 and ΔE hunter - Fig. 1 : Comparison of ΔE 2000 vs ΔE hunter for weathered coil coated metal - Fig. 2 : Comparison of ΔE 2000 vs ΔE hunter for weathered coil coated metal, highlighting saturated orange and red panels - Fig. 3 : Observer's evaluation ratings vs the group's ratings - Fig. 4 : Repeatability analysis - Fig. 5 : Observations of identical panels - Fig. 6 : Visual assessment ratings vs ΔE hunter' - Fig. 7 : Visual assessment ratings vs ΔE hunter' with data placed into four quadrants - Fig. 8 : Visual ratings vs ΔE 2000' with data placed into four quadrants - Table 1 : Experimental rating scale En ligne : https://drive.google.com/file/d/1vTW87lJyJBDepAPRfSWbjbwbD626aJGy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31807 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20503	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20503	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Documents numériques

Coatings Tech Vol. 16, N° 1 URL