Fully reactive PU hot melts offer performance advantages / Jack Chambers in ADHESIVES AGE, Vol. 41, N° 8 (08/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 8 (08/1998) . - p. 24-27 Titre : Fully reactive PU hot melts offer performance advantages Type de document : texte imprimé Auteurs : Jack Chambers, Auteur ; Timothy Moore, Auteur ; Lee Huber, Auteur ; David Frank, Auteur Année de publication : 1998 Article en page(s) : p. 24-27 Langues : Américain (ame) Catégories : Adhésifs -- Séchage sous rayonnement ultraviolet Adhésifs thermofusibles Hautes températures Polyuréthanes Réticulation (polymérisation) Viscosité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Increasing governmental regulation of solvents and VOCs, as well as the need in many industries for significant productivity and efficiency improvements to keep them competitive in the global environment, spawned the development of moisture-curing, polyurethane hot melt adhesives. Initially, traditional polyurethane hot melt adhesives addressed several of these issues; however the technology was somewhat limited. Reichhold has significantly improved the technology with its patented Ever-Lock[R] line of "fully reactive" polyurethane hot melts. Reichhold's "fully reactive" polyurethane hot melts are designed to successfully combine high performance thermoset bonding and highly efficient production capabilities for the end-user. In addition, this technology allows customers to bond a variety of substrates including plastics, pressed wood products, lauans, metals, stainless steel and vinyls. Figure 1 shows the chemical reactions of typical reactive polyurethane hot melts (PURHM). At the manufacturing site, polyols - materials that contain hydroxyl end groups - are combined with an excess of isocyanate-containing product. This combination produces polyurethane polymers with terminal isocyanate groups. These starting blocks determine the physical properties of the polymer. Initially, polyurethane hot melt adhesives function similarly to conventional thermoplastic hot melts and eliminate the need for extended compression or fixturing of the assemblies. Subsequently, the terminal isocyanate groups react with moisture in the substrates and surrounding air to form a thermoset adhesive bond. During the crosslinking process, the product evolves from a thermoplastic to thermoset adhesive, differentiating these products from conventional thermoplastic alternatives. Note de contenu : - Critical performance characteristics - Heat resistance - Stability - Green strength development - Open time - Applications/market opportunities - Profile wrapping - Recreational vehicles - Office furniture - Cleaning issues - Applications equipment En ligne : https://drive.google.com/file/d/1K2QvMz9Vex9i6WO-tg9Za2VZ3avxE-Az/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20314 [article]

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