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Extending moisture-cure polyurethane binders with water / Robert Cunningham in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 20, N° 4 (04/2013)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 20, N° 4 (04/2013) . - p. 22-29 Titre : Extending moisture-cure polyurethane binders with water : Water extension of reactive moisture-cure prepolymer binders has proven to be a practical technology with economic and performance benefits Type de document : texte imprimé Auteurs : Robert Cunningham, Auteur ; Jeff Stanley, Auteur ; John Lockard, Auteur Année de publication : 2013 Article en page(s) : p. 22-29 Langues : Américain (ame) Catégories : Colles:Adhésifs Liants Particules (matières) Polyuréthanes Réticulation à l'humidité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Moisture-cure polyurethane adhesives, or more particularly, moisture-cure polyurethane binders, are used extensively to combine particulate materials into a solid form either by molding or other processes. These particulate materials can be diverse in physical characteristics ranging from sand and small stones to recycled tire crumb, flexible urethane foam scrap, wood, and fiber. The final form of the binder/aggregate mixture can range from permeable paving to rubber tiles, resilient flooring, and foam carpet underlayment. One of the many challenges encountered in these applications is providing a reactive binder composition with the requisite physical properties that is low enough in viscosity to be rapidly and completely incorporated into the particulate mix. Another challenge is to provide a sufficient volume of binder to thoroughly and uniformly coat the surface of the particulate materials. These requirements are conventionally addressed through the inclusion of non-reactive organic diluents such as aromatic and naphthenic process oils in the binder formulation at levels of 30-40% or more to provide both viscosity depression and increased physical volume. However, these non-reactive diluents also have adverse effects on the physical properties of the cured composite and, in the case of aromatic oils, are under regulatory scrutiny for possible toxicological problems. Researchers wanted to develop an extender for moisture-cure polyurethane binders that would provide low viscosity, high physical volume, and minimal adverse effect on cured physical properties. Extension of moisture-cure polyurethane binders with water has proven to meet all of these criteria. Note de contenu : - Binder properties - Adding water - In-situ emulsion - Practical applications - Experimenting for efficiency - Meter/mix unit considerations - Production trials En ligne : http://www.adhesivesmag.com/articles/91824-extending-moisture-cure-polyurethane- [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18317 [article]

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Discoloration of elastomeric joint sealants / George T. Sivy in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 20, N° 4 (04/2013)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 20, N° 4 (04/2013) . - p. 30-42 Titre : Discoloration of elastomeric joint sealants : Various mechanisms and formulation components can cause sealant discoloration Type de document : texte imprimé Auteurs : George T. Sivy, Auteur Année de publication : 2013 Article en page(s) : p. 30-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Assemblages collés Décoloration Elastomères -- Détérioration Joints d'étanchéité Mastics Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Today’s elastomeric joint sealants are quite remarkable. For a relatively low cost, they provide much of the protection against air or water intrusion for many types of assemblies. In these applications, a sealant must adhere tenaciously to the substrates and maintain prolonged flexibility while being bombarded by wind, rain, heat, ultraviolet (UV) light, ice, dirt, and so on. In many cases, the sealants are also expected to maintain their color. Discoloration of paints, finished plastic components or sheets is a well-documented subject; however, it seems the same cannot be said of sealants. Granted, in terms of surface area in use, sealants account for a relatively small amount. Because of their location and visibility on many assemblies, however, any discoloration is readily apparent and often unsightly. For the most part, the only solution to this problem is a costly rework of seams to replace any sealant. This may be done in vain, however, if the basic cause of the problem is not identified or understood and the discoloration returns at a later time. It is useful to understand the basic mechanisms by which sealants may eventually discolor. This information may enable formulators to improve their offerings and aid end users in choosing the appropriate sealants for their applications. Note de contenu : - PATH TO DISCOLORATION - CHROMOPHORES - AUXCHROMES - MEASURING COLOR - CHEMICAL DISCOLORATION AND SEALANT FORMULATION : Polymer backbone - Fillers - Plasticizers - Crosslinkers or endblockers - Solvents (including water) - Adhesion promoters - Antioxidants - UV stabilizers - Catalysts - Other components - BACKBONES - FILLERS - PLASTICIZERS - SOLVENTS - ADHESION PROMOTERS - ANTIOXIDANTS - UV STABILIZERS - CATALYSTS - OTHER FACTORS AND EFFECTS : Microbial - Antimicrobial - Wood lignins and formaldehyde - Welding and O3 generation En ligne : http://www.adhesivesmag.com/articles/91825-discoloration-of-elastomeric-joint-se [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18318 [article]

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On the move in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 20, N° 4 (04/2013)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 20, N° 4 (04/2013) . - p. 44-45 Titre : On the move : Ford is using liquide gasketing in a new high-volume production engine Type de document : texte imprimé Année de publication : 2013 Article en page(s) : p. 44-45 Langues : Américain (ame) Catégories : Assemblages collés Automobiles -- Moteurs -- Pièces Colles Joints d'étanchéité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The Ford Motor Co.’s one-liter Fox engine will reportedly soon be manufactured across the globe. Designed at the company’s Dagenham Diesel Centre (DDC), it has the highest output per displacement of any high-volume production engine on the market, with a power output of 124 hp. The engine, which will be standard in the Ford Focus and many other future models, features technological improvements such as the use of Loctite 5900 room-temperature-vulcanizing (RTV) silicone for sealing the highly stressed joints. The powerful new engine is small and more highly stressed than old designs—a common industry trend and one to which Henkel gasketing products have responded. To meet the need for a flexible product to accommodate the increased vibration, Henkel recommended its Loctite 5900 silicone for sealing oil pan and front cover joints. When cured, the thixotropic black paste offers excellent performance in engine oils. “The Ford design rules dictate that the walls of an engine block should be a certain thickness,” said Tsunou Chang, Liquid Sealing specialist for Ford. “But progress comes out of challenging traditional ideas, and our designers had proved in studies that thinner walls were do-able. But that meant the RTV process had to seal the engine with reduced wall thickness, and that presented Henkel with a challenge.” Note de contenu : - Specialy developed anaerobic adhesives - Liquide gasketing - Relaxed tolerances En ligne : http://www.adhesivesmag.com/articles/91826-advancing-adhesives-on-the-move Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18319 [article]

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Adhesives & Sealants Industry - Vol. 20, N° 4 - 04/2013 URL