Mercury-free polyurethane adhesives / Frank Tran in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 7 (07/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 7 (07/2010) . - p. 21-24 Titre : Mercury-free polyurethane adhesives : Three new PU hardeners are free of mercury catalysts but offer final bonding characteristics similar to traditional mercury-containing Type de document : texte imprimé Auteurs : Frank Tran, Auteur ; Melanie Wyatt, Auteur ; Hans Kaul, Auteur Année de publication : 2010 Article en page(s) : p. 21-24 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Additifs Catalyseurs métalliques Colles bi-composante:Adhésifs bi-composant Colles:Adhésifs Mercure -- Suppression ou remplacement Polyuréthanes Réticulants Réticulation (polymérisation) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : "Adhesives are social substances", writes Irving Skiest, author of Handbook of Adhesives. "They unite materials, creating a whole that is greater than the sum of parts." Adhesives bond similar or dissimilar substrates, and growth in the adhesives industry has emanated from its advantages over other joining methods. For an adhesive to bond two substrates, it must: a) wet the substrate, b) chemically bond with the substrate, and c) have good cohesive strength. It is sometimes necessary to incorporate additives to wet the surface and bond with the substrate. Keep in mind that adhesion is not a property of a material; it depends on many factors, including substrates (mainly the surface, not bulk), surface preparation, adhesive type (chemistry), specimen geometry (joint design), test method and environment. In the case of bonding zinc-coated steel with aluminum, for example, it is the aluminum and zinc surfaces that have to bond, not the steel. Due to the growing concern over the toxicity of organo-mercury compounds in the environment, there is a universal effort to replace mercury-containing polyurethane (PU) adhesives. Organo-mercury compounds are used as catalysts in PU adhesives. The PU adhesives described in this paper represent 100% solid, two-component (2K) systems. Note de contenu : - FIGURES : 1. Urethane structure - 2. Polyurethane structure - 3. Structures of various polyols (diols) and diisocyanates - 4. Density data of PU adhesive hardeners - 5. Viscosity data of PU adhesive hardeners - 6. Gel time data of PU adhesives - 7. Cure time to Reach LSS of 145 psi - 8. Cure time to Reach LSS of 1160 psi - 9. Cure profile of mercury and non-mercury catalyst in PU systems - TABLES : 1. Mix ratios of mercury and non-mercury PU adhesives - 2. Tg data of mercury and non-mercury PU adhesives En ligne : http://www.adhesivesmag.com/articles/89189-mercury-free-polyurethane-adhesives Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25880 [article]

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