Aluminium trihydroxide (ATH) : a UV transparent filler for UV-curable coatings / Anthony A. Parker in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 39-46 Titre : Aluminium trihydroxide (ATH) : a UV transparent filler for UV-curable coatings Type de document : texte imprimé Auteurs : Anthony A. Parker, Auteur ; E. S. Martin, Auteur ; T. R. Clever, Auteur Année de publication : 1994 Article en page(s) : p. 39-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Hydroxyde d'aluminium Réticulation (polymérisation) Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Unlike other extenders, aluminum trihydroxide (ATH) absorbs very little ultraviolet radiation over the wave-length range which is commonly used to activate most UV photoinitiators (220 to 400 nm). This is demonstrated by comparing the total transmittance (diffuse and specular) of UV-cured polyurethane films with and without the use of ATH as an extender. Difference spectra between filled and unfilled systems show that ATH does not interfere with the transmittance of UV light. On the other hand, a comparable study with a silica-filled system indicates that a higher proportion of UV light is absorbed. Solid state 13C NMR and FTIR spectra of ATH-filled, silica-filled, and neat systems show that the final chemical components of the crosslinked polymer matrices are similar (...) Note de contenu : - EXPERIMENTAL : Composition and physical properties of fillers - Coating application and curing - Film densities and effective polymer concentrations - UV/VIS spectroscopy of cured films - UV/VIS spectroscopy of powders - Solid state 13C nuclear magnetic resonance (NMR) of cured films - Fourier transform infrared spectroscopy (FTIR) of cured films - Differential photocalorimetry studies (DPC) - RESULTS AND DISCUSSION : Effect of fillers on the degree of cure - UV/VIS measurements of cured films : total transmittance and absorbance - UV/VIS measurements of cured films : specular and diffuse transmittance - UV/VIS measurements of neat powders - Effect of particle size on the UV transparency of ATH Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18603 [article]

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Performance optimization of 100% solids, UV-cure inks and wood fillers using aluminum trihydroxide (ATH) filler / N. R. Dando in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 859 (08/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 67-72 Titre : Performance optimization of 100% solids, UV-cure inks and wood fillers using aluminum trihydroxide (ATH) filler Type de document : texte imprimé Auteurs : N. R. Dando, Auteur ; P. L. Kolek, Auteur ; T. R. Clever, Auteur ; E. S. Martin, Auteur Année de publication : 1996 Article en page(s) : p. 67-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois Brillance (optique) Charges (matériaux) Couches minces Couleur Encre Encre -- Séchage sous rayonnement ultraviolet Hydroxyde d'aluminium Matériaux -- Propriétés optiques Panneaux de particules Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : This paper employs differential photocalorimetry, color, gloss, and physical test measures to characterize the effects of aluminum trihydrate (ATH) loading (from 13 to 56% by weight) on the ultra-violet (UV) transparency, enthalpy of cure, and cure kinetics of pigmented and unpigmented UV-cure inks and wood fillers. The thixotropic properties and relatively low opacity of ATH allows the use of significant loading levels without whitening pigmented inks or opacifying clear wood fillers. This work demonstrates how increased loadings of ATH, a UV transparent filler, can be employed to increase fully-cured coating thicknesses of UV-cure coatings for a given cure irradiance, and increase cure kinetics (rate of cure) for a given coating thickness, while also offering substantial cost savings by replacing more expensive components. Note de contenu : - EXPERIMENTAL : Preparation and curing of UV-cured films - Color and gloss measures - Differential photocalorimetry - UV-visible spectroscopy - RESULT AND DISCUSSION : Red UV-cure screen printing ink - UV-cure high speed wood filler Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18430 [article]

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