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Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part I : morphological study and effect of relative humidity on adhesion strength / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)
[article]
Titre : Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part I : morphological study and effect of relative humidity on adhesion strength Type de document : texte imprimé Auteurs : William Nguegang Nkeuwa, Auteur ; Bernard Riedl, Auteur ; Véronic Landry, Auteur Année de publication : 2014 Article en page(s) : p. 283-301 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Argile
Bois -- Revêtements protecteurs
Nanoparticules
Revêtements -- Effets de l'humidité
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements multicouches
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : Multilayer coatings that are used to protect surfaces of wood components constituting ready to assemble furniture must have good adhesion to the substrate, particularly for wood furniture used in high humidity environments like bathrooms. It is not known whether adding nanoparticles to such coatings will change their properties. Surfaces of yellow birch wood (Betula alleghaniensis Britton) were protected with six different types of multilayer coatings (MCs). Prepared primer and topcoat UV-curable formulations constituting these MCs contained, respectively, hydrophobic-fumed silica (NS) and nanoclays (NC). They were added at 0 and 0.5 wt% for NS and at 0, 1, and 3 wt% for NC. The viscosity behavior of these formulations was evaluated as a function of shear rate. The morphology of the cross-section of coated wood samples was qualitatively studied by means of both scanning and transmission electron microscopy (SEM and TEM analysis). The adhesion strength of these MCs on wood surfaces was assessed as a function of relative humidity (RH). TEM images have revealed that topcoats reinforced with NC appear to have an intercalated (micro and nanoparticles) morphology. Statistical results have shown that NS and NS × NC do not significantly confer additional adhesion strength of MCs on wood surfaces, whereas the effect of NC is significant. The adhesion strength of coated wood samples conditioned at 80% RH was higher than that obtained on those conditioned at 40% RH. Multilayer coating # 5 ([0.5 wt% NS—1 wt% NC] combination) has been chosen as the ideal protection system for two reasons: (i) high adhesion strength at low RH and (ii) good barrier properties. Note de contenu : - EXPERIMENTAL : Materials - UV-curable formulations : preparation and viscosity measurement - Statistical design - Wood surface preparation - Formulations application and UV-curing process - Preparation and conditioning of coated wood samples - Characterization - statistical analysis
- RESULTS AND DISCUSSION : Viscosity behavior of UV-curable formulations - Morphology of the cross-section of multilayer coatings on wood surfaces - Adhesion strength of multilayer coatings on wood surfaces
DOI : 10.1007/s11998-013-9551-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9551-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21448
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 3 (05/2014) . - p. 283-301[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16292 - Périodique Bibliothèque principale Documentaires Disponible Zinc-rich primer and UHP waterjetting in severe marine environments / Philippe Le Calvé in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 3 (03/2017)
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Titre : Zinc-rich primer and UHP waterjetting in severe marine environments Type de document : texte imprimé Auteurs : Philippe Le Calvé, Auteur ; Christian Favennec, Auteur ; Nicolas Bocca, Auteur Année de publication : 2017 Article en page(s) : p. 64-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Adhésion
Délaminage
Essais (technologie)
Essais accélérés (technologie)
Jet d'eau à haute pression
Marines (peinture)
Métaux -- Revêtements protecteurs
Primaire (revêtement)
Rugosité
Surfaces -- Analyse
Surfaces -- Nettoyage
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : Surface preparation processes influence the performance and lifetime of coating systems applied to steel substrates. Thus, the condition of the steel surface immediately prior to painting is crucial and the main factors influencing coating performance are the presence of rust and mill scale, surface contaminants including dust, salts and grease, and surface profile. For aggressive environments, such as marine atmospheres of a C5M corrosivity category, and high-performance coatings that require cleaner and/or rougher surfaces, blast-cleaning is often preferred as per ISO 8501-1, “Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings” or SSPC-VIS 1.
As an alternative to abrasive cleaning for maintenance work or complete renovation, ultra-high-pressure (UHP) waterjetting may be a promising strategy for surface preparation as long as the performance of the coating on steel is not affected. However, it is critical to characterize the surface quality of steel substrates prepared by UHP waterjetting in terms of flash rust, salt contaminants or surface roughness.Note de contenu : - FORMER STUDIES
- STUDY DETAILS
- TESTING CRITERIA : Roughness measurement - Soluble test measurement - Analysis of iron oxides - Paint application - Artificial aging tests - Measurement of delamination after aging
- RESULTS : Delamination before coating removal - Delamination after coating removal (24 weeks) - Variation in the ultimate stress and adhesion, before and after aging
- TABLES : 1. Surface parameters - 2. Explanation of cases - 3. Paint systems testedEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6028 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28369
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 3 (03/2017) . - p. 64-72[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18811 - Périodique Bibliothèque principale Documentaires Disponible