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Simulating natural sunlight / Matt McGreer in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4528 (09/2008)
[article]
Titre : Simulating natural sunlight Type de document : texte imprimé Auteurs : Matt McGreer, Auteur ; Jamie Chesler, Auteur Année de publication : 2008 Article en page(s) : p. 28-30 Langues : Anglais (eng) Catégories : Analyse spectrale
Essais accélérés (technologie)
Essais accélérés (technologie) -- Appareils et matériels
Filtres
Rayonnement solaire
Rayonnement ultraviolet
Simulation, Méthode deIndex. décimale : 667.9 Revêtements et enduits Résumé : The author provides an insight into filtering technology breakthroughs which replicate natural sunlight.
Due to the need for more rapid evaluations and tighter control of test conditions, many plastics engineers turn to accelerated testing devices with artificial light sources over outdoor exposure to test the resistance of materials to weathering. While the novice weathering experimenter in a polymer-testing laboratory might only be concerned with the quantity of light energy deposited on their specimens, it is the 'quality' of the light source (when compared with natural sunlight) that determines the potential correlation with natural, outdoor exposures. In this paper, spectral power distribution graphs representing both full spectrum and short wavelenght UV ranges will be discussed. This data will highlight new break-throughs in filtering technology that now replicate natural sunlight in the short wavelength UV more closely than ever before in commercially available xenon-arc weathering instruments.Note de contenu : - Defining solar radiation
- History of artificial weathering devices
- Xenon arc sources
- GRAPHICS : 1. Spectral power distribution of Miami peak sunlight at site latitude - 2. Fluorescent UV vs natural sunlight - 3. Spectral power distribution of Xenon arc lamps with varous filter combinations (irradiance normalised to 1,70W/(m^2 6 nm) at 560 nm - 4. Right light filter system vs sunlightEn ligne : https://drive.google.com/file/d/1XSgz8g078jUbeb0XbMxOGHJ6rsE_UXJ3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27615
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 198, N° 4528 (09/2008) . - p. 28-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010736 - Périodique Bibliothèque principale Documentaires Disponible Simultaneous acid exposure and erosive particle wear of thermoset coatings / Victor Buhl Møller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
[article]
Titre : Simultaneous acid exposure and erosive particle wear of thermoset coatings Type de document : texte imprimé Auteurs : Victor Buhl Møller, Auteur ; Kim Dam-Johansen, Auteur ; Sarah Maria Frankaer, Auteur ; Søren Kiil, Auteur Année de publication : 2018 Article en page(s) : p. 457-469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides
Copolymère vinyle ester
Epoxydes
Essais accélérés (technologie)
Lixiviation
Matériaux -- Propriétés barrières
Polyuréthanes
Revêtements -- Analyse
Revêtements -- Détérioration
Revêtements organiques
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Handling acidic chemicals is a challenge in the chemical industry, requiring a careful choice of contact material. Certain thermoset organic coatings are applicable in low pH environments, but when particulate erosion is also present the performance demand is increased. This is the case in, e.g., stirred tanks for agitated leaching of copper ore, where sulfuric acid is mixed with an erosive slurry. A pilot-scale agitated leaching tank was designed and constructed to explore the performance of selected thermoset coatings in such an environment. For reference, simple immersion experiments were conducted. Coating durability was estimated by observing the film thickness change during exposure. It was found to be a function of film swelling and film contraction, due to chemical exposure, as well as the “polishing” caused by erosive wear. Film reduction rates varied with radial position in the tank bottom-placed coating samples. Maximum rates were found about halfway between the reactor center and wall. Polishing rates also varied significantly with acid concentration, most likely due to chemical reactions taking place between the acid and the coatings, damaging surface mechanical properties, similar to the erosion/corrosion-type phenomena found in metals. A vinyl ester-based coating was the most resistant to the simultaneous erosive/acidic exposure, with a maximum polishing rate of 3.24±0.61 μm/week, while novolac epoxy and polyurethane coatings showed high polishing rates of 11.7±1.50 and 13.4±0.57μm/week, respectively. Note de contenu : - INTRODUCTION : Agitated leaching - Degradation mechanisms
- REPLICATING LEACHING CONDITIONS : downscaling of an industrial leaching reactor - Erosive and chemical environment
- EXPERIMENTAL : : Coatings and curing - Procedure
- RESULTS AND DISCUSSION : Mild condition erosion - Harsh condition erosion - Varying polishing rates - Tg and hardness effects - Chemical reaction effects - Polishing and reaction mechanismDOI : 10.1007/s11998-018-0058-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0058-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30742
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Solubility and durability of cardanol derived plasticizers for soft PVC / A. Greco in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 5 (11/2016)
[article]
Titre : Solubility and durability of cardanol derived plasticizers for soft PVC Type de document : texte imprimé Auteurs : A. Greco, Auteur ; F. Ferrari, Auteur ; R. Velardi, Auteur ; M. Frigione, Auteur ; A. Maffezzoli, Auteur Année de publication : 2016 Article en page(s) : p. 577-586 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Cardanol
Chlorure de polyvinyle
Durée de vie (Ingénierie)
Epoxydation
Essais accélérés (technologie)
Gélification
Plastifiants
Rhéologie
Solubilité
Souplesse (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : The aim of this work is the analysis of the suitability of cardanol derivatives as primary plasticizer for polyvinyl chloride (PVC). Cardanol derived plasticizers (CDP) were obtained by acetylation of cardanol, followed by epoxidation of the side chain double bonds. The developed procedures allowed to achieve high yields of acetylated cardanol, whereas plasticizers characterized by different yields of epoxidation were obtained, according to the used synthesis procedure. Rheological analysis was used in order to study the gelation process of PVC plastisols with CDP. A comparison of commercial phthalate and natural derived plasticizers showed that the CDP are characterized by adequate gelation properties, involving a complete absorption of the plasticizers at relatively low temperatures. The gelation properties showed a strong dependence on the yield of the epoxidation. In particular, lower gelation temperatures, higher plasticizer absorption and faster gelation were observed for higher epoxy content in the plasticizer. Finally, ageing tests were performed on soft PVC produced by the CDP. The weight loss of soft PVC with CDP is comparable to that of commercial plasticizers, particularly at high yields of epoxidation. DOI : 10.3139/217.3237 En ligne : https://drive.google.com/file/d/1YK59j8qoG1stCxiIvFJoeZBS3bl0mwKo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27395
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Code-barres Cote Support Localisation Section Disponibilité 18491 - Périodique Bibliothèque principale Documentaires Disponible Solventborne paint systems on carbon steel and hot-dip galvanized steel for a wide range of atmospheric exposures / F. Fragata in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 1 (03/2007)
[article]
Titre : Solventborne paint systems on carbon steel and hot-dip galvanized steel for a wide range of atmospheric exposures Type de document : texte imprimé Auteurs : F. Fragata, Auteur ; D. de La Fuente, Auteur ; E. Almeida, Auteur ; D. Santos, Auteur ; M. Morcillo, Auteur Année de publication : 2007 Article en page(s) : p. 75-87 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone
Anticorrosifs
Anticorrosion
Essais accélérés (technologie)
Matériaux -- Propriétés barrières
Métaux -- Revêtements:Métaux -- Peinture
Pigments
Polymères
Revêtement en phase solvant:Peinture en phase solvantIndex. décimale : 667.6 Peintures Résumé : The paper analyzes the performance of solventborne paint systems applied on carbon steel and hot-dip galvanized steel in a wide range of atmospheric exposures. The study has involved paint systems exposure for 3.5 years in eight natural atmospheres. The atmospheric conditions cover from temperate rural climates to tropical severe marine and Antarctic coastal regions. The paint systems included several alkyds formulated with a variety of pigments (anticorrosive and barrier), epoxies, chlorinated rubber, and zinc-rich (ethyl silicate and epoxy). It has been concluded that in rural and urban atmospheres alkyd systems afford equivalent anticorrosive protection of steel to the epoxy/polyurethane system. The toxic red lead pigment may be replaced in long linseed-oil alkyd primer paints by non-toxic pigments, such as a mixture of micaceous iron oxides (MIO) and black iron oxides or zinc phosphate, without affecting the anticorrosive properties of the paint system. In aggressive atmospheres (industrial, marine), paint systems including zinc-rich primers or applied on galvanized steel must be used, especially in surface regions with coating faults (scribes). DOI : 10.1007/s11998-007-9003-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9003-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3673
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Code-barres Cote Support Localisation Section Disponibilité 007149 - Périodique Bibliothèque principale Documentaires Disponible 008267 - Périodique Bibliothèque principale Documentaires Disponible STEP Leather Project / European Commission (Bruxelles, Belgique) / Kobenhavn K [Denmark] : The Royal Danish Academy of Fine Arts, School of Conservation (1994)
Titre : STEP Leather Project : Evaluation of the correlation between natural and artificial ageing of vegetable tanned leather and determination of parameters for standardization of an artificial ageing method Type de document : texte imprimé Auteurs : European Commission (Bruxelles, Belgique), Auteur Editeur : Kobenhavn K [Denmark] : The Royal Danish Academy of Fine Arts, School of Conservation Année de publication : 1994 Importance : 180 p. Présentation : ill. Format : 30 cm ISBN/ISSN/EAN : 978-87-89730-01-1 Note générale : La page de titre porte en plus "Protection and Conservation of European Cultural heritage" - Research Report N° 1 - Directorage - General for Science, Research and development Langues : Anglais (eng) Catégories : Cuirs et peaux -- Conservation
Cuirs et peaux -- Détérioration
Essais accélérés (technologie)
Etudes comparatives
Rapports techniques
Tannage végétal
VieillissementIndex. décimale : 675 Technologie du cuir et de la fourrure Note de contenu : - Materials
- Ageing experiments CRCDG
- Ageing experiments LCC
- Amino acid analysis
- The possible link between the collagen sequence and structure and it's oxidative deterioration pattern
- GC/MS analysis of degradation products
- Analysis of the isoelectric focusing patterns of naturally and artificially aged leathers
- Tannin and ion analysis of naturally and artificially aged leathers
- Moisture uptake/release and chemical analysis
- DSC analysis
- Standard chemical and physical analysis
- Determination of hydrothermal stability (shrinkage temperature)
- Summary, discussion and conclusionPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40481 Réservation
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