| 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 organiques
|
| Index. 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 lamps |
| En ligne : |
https://drive.google.com/file/d/1yqvk9NMqADTP_o9h_8WcGnfZy59u3NVp/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| 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
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