GRP composite manufacturing optimization / David Beke in JEC COMPOSITES MAGAZINE, N° 119 (03/2018)

[article]  inJEC COMPOSITES MAGAZINE > N° 119 (03/2018) . - p. 44-46 Titre : GRP composite manufacturing optimization : opportunities with UV curing Type de document : texte imprimé Auteurs : David Beke, Auteur ; Luc Boogaerts, Auteur ; Patrice Roose, Auteur ; Jon Shaw, Auteur Année de publication : 2018 Article en page(s) : p. 44-46 Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Composites à fibres de verre Enroulement filamentaire Flexion (mécanique) Matériaux -- Imprégnation Polymérisation Pultrusion Rayonnement ultraviolet Rhéologie Transition vitreuse Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : Composite manufacturers are facing increasing pressure to improve operational efficiency, identify saving opportunities and reduce their ecological footprint, without compromising material performance. The implementation of an ultraviolet (UV) curing manufacturing process is proving to be an effective step towards these goals. Before considering such process improvements, maanufacturers and OEMs should be aware of the benefits and boundaries of the current state of the art in UV curing technology. Note de contenu : - BENEFITS AND BOUNDARIES : WHEN TO CONSIDER USING UV TECHNOLOGY ? : Prepregs : stable storage and fast, controlled curing - Pultrusion : increased line speed, reduced energy consumption and cleaning labour - Filament winding : reduced cycle time, energy cost and number of mandrels in use - In-field repair : fast return to service and high process control - New opportunities - MATERIAL PROPERTIES - Table : Viscosity, glass transition temperature (T(tanδmax) determined with dynamic mechanical analysis) and flexural properties of three typical UV-cured systems - Fig. 1 : Possible implementation scheme of a filament winding process with UV curing - Fig. 2 : Flexural modulus versus temperature of non-reinforced UV-cured resins and a typical glass fibre-reinforced (fibre content : 83wt %) UV-cured composite relative to monolithic glass. The set of UV-cured resins ranks from grey to black according to an increasing level of crosslinking density from medium to high Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30378 [article]

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A new polyester resin for béta-hydroxyalkylamide powder coatings / Daniel Maetens in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/99 (05/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 5/99 (05/1999) . - p. 26-33 Titre : A new polyester resin for béta-hydroxyalkylamide powder coatings Type de document : texte imprimé Auteurs : Daniel Maetens, Auteur ; Luc Moens, Auteur ; Luc Boogaerts, Auteur ; Kris Buysens, Auteur Année de publication : 1999 Article en page(s) : p. 26-33 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : A carbonyl terminated polyester resin, of novel molecular composition , has been developed for use in powder coatings containing beta-hydroxyalkylamide ( HAA) type hardeners. The design of this new resin enables powders to be formulated that exhibit outsatnding flow without sacrificing other properties, such as acid rain resistance, or colour stability on overbake. Note de contenu : - Safe alternatives for TGIC - All advantages are in one and the same polyester resin - Low viscosity with an excellent hydrolysis/UV resistance is very difficult to design - Reactivity only depends on the structure of the polyester - The new resin should get outstanding flow with excellent corrosion and UV resistance - Materials - Formulations/ processing - Flow curves - Wave-scan measurements - Corrosion resistance - Weather resistance - Overbaking/ gasoven resistance - Flexibility - Visco-elastic behaviour can be described using the storage and the loss modulus - Flow behaviour and general appearance of " Primid XL-552" based powder coatings - Flow behaviour and general appearance of "Primid QM-1260" basedf powder coatings - The best flow is obtained with the new resin - Degassing during curing - New resin shows the lowest melt viscosity and the lowest reactivity - New system shows hydrolytic stability - Monomer composition does not prove any negative influence of UV-resistance - Overbaking and gasoven resistance - New resin is found to be as good as for the references considering mechanical properties En ligne : https://drive.google.com/file/d/1kDUDSla0lmdozsrl2ssq4dbZuGE9T4xH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11187 [article]

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