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Grafting photoinitiators to acrylates / Richard Plenderleith in EUROPEAN COATINGS JOURNAL (ECJ), (07-08/2023)
[article]
Titre : Grafting photoinitiators to acrylates : A novel approach for the LED curing of low-migration, low-hazard UV sysgtems Type de document : texte imprimé Auteurs : Richard Plenderleith, Auteur ; Kevin Demoulin, Auteur Année de publication : 2023 Article en page(s) : p. 28-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages.
Diodes électroluminescentes
Greffage (chimie)
Photoamorceurs (chimie)
Photoréticulation
Revêtement -- Séchage
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Radiation curing is often thought to be a more sustainable technology due to the reduced energy usage and carbon footprint during cure with further reductions as the industry moved from mercury lamps to modern LED technology. Increasingly, sustainability in UV technology also encompasses hazard classifications of raw materials, user safety, and component migration. This paper presents a self-reactive resin
that offers formulators greater control and ease of use while meeting specifications.Note de contenu : - High concentration of migratable material for type II photoinitiators
- Increased severity of hazard classifications
- Self reactive resins offer improved handling
- Acrylate multifunctionality boost reactivity
- Reduced migration with modified triacrylate
- LED-active resin for greater ease of use
- Fig. 1 : Photolysis of a Norris Type 1 hydroxy acetophenone photoinitiator to form two active radicals
- Fig. 2 : Hydrogen abstraction mechanism of a Norrish Type II benzophenone generating two radicals
- Fig. 3 : Typical structure of a polymeric photoinitiator showing the end group functionality coupled to an inert linear or multi-armed polymer
- Fig. 4 : General structure of a self-reactive resin with photoinitiating units, backbone units and polymerisable (meth)acrylate functionality
- Fig. 5 : UV spectrum of TW-TriA collected on a Shimadzu UV1800, using 1 cm path length and TX-TriA at 0.5 g L-1 in methanol
- Fig. 6 : Reactivity of flexographic printing type formulations containing the thioxanthone-modified triacrylate vs 2% polymeric TX and ITX cured speed under LED 395 nm (dashed line)
- Fig. 7 : Gas chromatography mass spectra of acetonitrile extract (24 h at 40°C from cured films containing ITX, polymeric TX and TX-TriA
- Table 1 : Detailed test formulation for evaluation of reactivity of the thioxanthone triacrylate under standard UV mercury and 395 nm LED lampsEn ligne : https://drive.google.com/file/d/1yqvk9NMqADTP_o9h_8WcGnfZy59u3NVp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39667
in EUROPEAN COATINGS JOURNAL (ECJ) > (07-08/2023) . - p. 28-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24129 - Périodique Bibliothèque principale Documentaires Disponible Guiding light with high precision through LSR / Uwe Becker in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 12 (12/2018)
[article]
Titre : Guiding light with high precision through LSR : Wilhelm Weber produces light guides for use in LED headlamps of luxury sedans Type de document : texte imprimé Auteurs : Uwe Becker, Auteur Année de publication : 2018 Article en page(s) : p. 26-28 Langues : Anglais (eng) Catégories : Automobiles -- Eclairage
caouchouc de silicone liquide
Diodes électroluminescentes
Matières plastiques -- Moulage par injection
Matières plastiques dans les automobilesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Automotive headlamps fitted with the latest combined LED and laser technology, especially the kind deployed in modern luxury sedans, rely on silicone components to bundle and guide the light. Weber Esslingen produces such a silicone light guide for the company Hella, a tier 1 customer. This injection molded part is integrated into the front lighting system of the latest Audi A8 generation. Note de contenu : - New matrix LED light dynamically illuminates the road
- How the silicone light guide is created
- After removal, the parts are annealed and optically inspected
- A proven partnership
- Fig. 1 : The LSR light guide acts like a kind of diffusing lens to bundle and guide the light from the individual LEDs
- Fig. 2 : The individual silicone fingers are oriented such that the light from the LED sources converges in horizontal orientation on the output side of the light guide to create the desired beam
- Fig. 3 : A view inside the movable part of the 2-cavity lens mold shows the highly polished surfaces of the cavities and the high-precision lens structures (silicone fingers) that require faithful reproductionEn ligne : https://drive.google.com/file/d/1j91AIy0tp1zXyKrGRitAuP8nNWngN9CG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31419
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 12 (12/2018) . - p. 26-28[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20464 - Périodique Bibliothèque principale Documentaires Disponible High wavelength high blue light induced damages in human skin / Hanane Chajra in SOFW JOURNAL, Vol. 146, N° 1-2 (01-02/2020)
[article]
Titre : High wavelength high blue light induced damages in human skin Type de document : texte imprimé Auteurs : Hanane Chajra, Auteur ; David Garandeau, Auteur ; Mathilde Fréchet, Auteur ; Francine Joly, Auteur Année de publication : 2020 Article en page(s) : p. 26-33 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermatologie
Diodes électroluminescentes
Extraits de plantes:Extraits (pharmacie)
Lumière artificielle -- Effets physiologiques
Lumière bleue
Peau -- Histologie
Photodétérioration
Photovieillissement (dermatologie)Index. décimale : 668.5 Parfums et cosmétiques Résumé : In our hyper-connected world, we spend countless hours in front of digital screens emitting blue light (BL) with the general perception that this is safe for our skin, but the infiltration of electronic devices in our daily lives does not come without consequence. There is scarce data that touches on the effects of BL on human skin. Moreover, the data available so far has been performed on basic cellular models that are far from the complexity of human skin. This study focuses on the identification of the BL induced damage using 3D models. We found that direct BL exposure to the skin generates ROS leading to oxidative stress marker generation including protein carbonylation, nitrotyrosine, 4-hydroxynonenal. In addition, the expression of matrix metalloproteinase-1 which is responsible for extracellular matrix degradation during chronological aging and photoaging processes is increased. These data show that blue light emitted by electronic devices affect skin health and may be involved in premature aging. Note de contenu : - RESULTS AND DISCUSSION : LED-BL induces intracellular reactive oxygen species generation in human keratinocytes - LED-BL induces oxidative damage in human skin - Oxidative stress induced by LED-BL leads to protein damage in dermis and epidermis via the release of 4-Hydroxy-2-Nonenal (4-HNE) - LED-BL is a potent inducer of skin damage through
MMP-1 overexpression and protein oxidation - LED-BL induces similar effects as UVB irradiation in skin suggesting a potential role in triggering premature aging - Skin damage induced by blue light can be easily prevented or limited by the use of cosmetic products
- MATERIALS AND METHODS : Description of light-emitting diode generated blue light (LED-BL) device used in the experimental studies - Plant extract description - Monolayer keratinocyte's model exposed to blue light - Human skin explants - Histological processing of skin samples - Image acquisition and quantification
- Fig. 1 : Light emitting diode emission spectra
- Fig. 2 : Measurement of intracellular reactive oxygen species generated using H2DCF-DA fluorescent probe
- Fig. 3 : Visualization and quantification of oxidative stress markers in human skin explants exposed or not to blue lightEn ligne : https://drive.google.com/file/d/18XwQGr3LZVYDLSJgU9Xs82tQNvO9PlmR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33756
in SOFW JOURNAL > Vol. 146, N° 1-2 (01-02/2020) . - p. 26-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21511 - Périodique Bibliothèque principale Documentaires Disponible Highlighting the importance of homogeneous curing / David Ivarsson in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4666 (12/2020)
[article]
Titre : Highlighting the importance of homogeneous curing Type de document : texte imprimé Auteurs : David Ivarsson, Auteur Année de publication : 2020 Article en page(s) : p. 15-17 Langues : Anglais (eng) Catégories : Automatisation
Diodes électroluminescentes
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Surveillance numériqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Impact of different intensities on the performance of LED cured coatings.
The UV-LED technology provides a number of great advantages, such as energy savings, long lifetime, low heat, no ozone and no mercury. With LED technology, we rely on thousands of small LEDs to sufficiently cure our coating. What if there is a deviation along the width of the lamp? If a segment goes out, if some of the optics gets damaged or dirty, how does this impact the curing and the final properties? See Figures 1 and 2.
This study aims to determine what level of deviation causes problems with insufficient cure. To prevent problems with insufficient cure, Efsen has developed a proprietary technology, to continuously monitor the output of an UV lamp during production. Not only does this show us the complete picture of the UV output along the width of the lamp, it is also able to use the extracted information to adjust the power level of any segments that do not conform to the specification. This will provide an assurance, in real time, that all segments perform according to the specifications and also lets you know directly when there is damage, dirt or other issues preventing a segment to perform to standard.Note de contenu : - What is the required illumination to sufficiently cure the reactive material ?
- Transitioning to industry 4.0 - accurate curing requirements
- The choice of wavelength
- Test setup and execution - Dose and peak requirements
- The importance of monitoring the full width of an LED array, in order to maintain the cure required for desired coating performance
- In-line continuous automated dynamic UV monitoringEn ligne : https://drive.google.com/file/d/1yFXxM4hH3QfATQxueyTGiLnsrRFhoRgx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36739
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4666 (12/2020) . - p. 15-17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23119 - Périodique Bibliothèque principale Documentaires Disponible Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation / Yamen Lai in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)
[article]
Titre : Highly transparent thermal stable silicone/titania hybrids with high refractive index for LED encapsulation Type de document : texte imprimé Auteurs : Yamen Lai, Auteur ; Lujiang Jin, Auteur ; Jianzhong Hang, Auteur ; Xiaoying Sun, Auteur ; Liyi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 1185-1192 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Conditionnement
Diodes électroluminescentes
Dioxyde de titane
Encapsulation
Matériaux hybrides
Matériel optique
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Silicone/titania hybrids for LED encapsulation were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains. Crack-free thick films (~1 mm) were fabricated by curtain painting. The hybrid films with different Ti contents were characterized by FTIR, UV–VIS, TGA/DSC, AFM, TEM, ellipsometer, etc. Results show that the hybrid films contain long alkyl chains which have high thermal stability against yellowing owing to the steric hindrance given by long alkyl chains. The hybrid films have high transmittance (≥98% in visible range) and high refractive index (1.591–1.681). In LED encapsulation, the silicone/titania hybrids with an RI of 1.605 increased the light extraction efficiency of bare blue LEDs by 19.4%. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Synthesis of silica sol - Synthesis of silica–titania hybrid sols and their films - Measurement and characterization
- RESULTS AND DISCUSSION : FTIR spectra of the films - Optical properties of the films - Thermal stability of the films - Micromorphology of the films - LED encapsulationDOI : 10.1007/s11998-015-9681-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9681-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24976
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1185-1192[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17585 - Périodique Bibliothèque principale Documentaires Disponible PermalinkPermalinkImpressive experience / Rolf-Uwe Müller in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 10 (10/2013)
PermalinkInfluence of different photoinitiatiors in the UV-LED curing of polyester acrylated varnishes / Ricardo Dossin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)
PermalinkPermalinkInteractive composite bridge / Sandra Gelbrich in KUNSTSTOFFE INTERNATIONAL, Vol. 105, N° 12 (12/2015)
PermalinkPermalinkA key to the future / Bernhard Klein in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 12 (12/2010)
PermalinkLED curing in automotive and transportation applications / Jennifer Heathcote in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4630 (04/2017)
PermalinkLED curing : The future is now / Sara Jennings in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 202, N° 4571 (04/2012)
PermalinkLED lighting technology in vogue / Martin Döbler in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 10 (10/2012)
PermalinkLED units with plug & play technology in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 10, N° 3 (2017)
PermalinkLess granules stock means more quality / Georg Steinbichler in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 7 (2020)
PermalinkLet there be LEDs in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 3 (03/2010)
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