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Reducing wood curing costs / Robert A. Wade in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4489 (06/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4489 (06/2005) . - p. 46-48 Titre : Reducing wood curing costs Type de document : texte imprimé Auteurs : Robert A. Wade, Auteur ; Michael J. Dvorchak, Auteur ; Chirstopher Irle, Auteur Année de publication : 2005 Article en page(s) : p. 46-48 Langues : Anglais (eng) Catégories : Bois -- Finition Carbodiimides Coût -- Contrôle Dispersions et suspensions Photoréticulation Polyisocyanates Polyuréthanes Vernis -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : This article explains how UV-curable polyurethane dispersions in wood coatings reduce the investment in costs in UV equipment. Radiation curable coatings have been used in the wood coatings industry for several years. To improve productivity in many applications, flat substrates are coated, e.g. in hardwood flooring or the furniture industry. Major benefits of a photopolymerisation are the high curing speed and high crosslink density. High performance coatings with excellent abrasion as well as chemical resistance are obtained. When complex substrates must be coated there is always the concern of uncured surfaces in shadow areas. Typically, more expensive UV-equipment that optimises a homogeneous radiation exposure is necessary. In addition, only high throughput lines make an investment in UV curing equipment affordable. The high investment costs were seen for years as the biggest hurdle for an industrial coater before entering into UV curing technology. A new coatings system based on UV-PUD's can be cured with low energy UV-A lights, without sacrifice of performance properties for wood coatings applications. These types of lamps are significantly cheaper in their investment costs as well as in their maintenance. Coatings performances will discussed with special respect to low intensity UV-A lamps, UV-curing PUD's, and the effect of adding self-crosslinking dispersions. The effects of adding water-dispersible polyisocyanates and carbodiimide crosslinkers to such coatings are also presented. Note de contenu : - UV curing and UV equipment - Radiation curing dispersions - Low-intensity UV-cured water-borne coatings - FIGURES : 1. UV-A lamp spectral output with blue filters (wavelength in nm) - 2. Building blocks of UV-curing polyurethane dispersions - 3. Hardness properties at various cure conditions - 4. Chemical resistance properties at various cure conditions - 5. Hardness and chemical resistance with addition of carbodiimide crosslinker (system B) - 6. Staining resistance of dual cure waterborne UV pigmented coatings Din 68861 1b, 5 = pass, 0 = fail - 7. Hardness development of dual cure waterborne UV pigmented coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27637 [article]

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