Chemical durability of silylated polyurethane-based formulations / Patrice Lehmann in ADHESIVES AGE, Vol. 41, N° 1 (01/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 1 (01/1998) . - p. 28-32 Titre : Chemical durability of silylated polyurethane-based formulations Type de document : texte imprimé Auteurs : Patrice Lehmann, Auteur ; Robert R. Johnston, Auteur Année de publication : 1998 Article en page(s) : p. 28-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Formulation (Génie chimique) Immersion Joints d'étanchéité Mastics Polyuréthanes Produits d'étanchéité Résistance chimique Silanes organofonctionnels solvants Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Witco Silquest silanes and SPUR technology are designed to allow for tailor-made prepolymers suitable for low to high modulus formulations with identified benefits such as improved UV stability/weatherability and adhesion performance.This study of chemical resistance leads to the conclusion that the inherent benefits of durable siloxane bonding -well-known and anticipated for various coatins applications- extends to silylated polyurethane-(SPU)based sealants. Apparently the synergy of the siloxane crosslinking and the polyurethane chemistry enhances the chemical resistance of these kinds of SPU-based sealants products. The model sealant formulations SPU A and SPU B revealed integrity towards chemical attack when compared to representative commercially available sealants. Immersion in solvents such as diesel fuel, transmission oil and anti-freeze for prolonged periods of time, even at elevated temperature, resulted in minimal changes in mechanical properties when compared to all other representative candidates types of sealants. This result make them particularly suitable for the automotive area such as engine compartment applications. Whereas all other sealants revealed at last one solvent as particularly problematic, the SPU-based products show the greatest range of chemical resistance over all mechanical properties measured. Generally all these sealants excluding SPU-based products had a significant problem maintaining integrity of modulus. Sealants based on SPUR technology show the best performance in regard to chemical resistance as a function of temperature. To further verify these findings other SPU-base laboratory sealants are being added to this evaluation program. This work will extend to adhesion performance tested afeter solvent exposure. The synergy of both improved adhesion performance and good chemical resistance is expected to result in further meaningful benefits. Note de contenu : - EXPERIMENTAL : Preparation of silylated polyurethane resins - Sealant preparation - COMMERCIALLY AVAILABLE SEALANT COMPARISONS : - SAMPLE PREPARATION AND TESTING En ligne : https://drive.google.com/file/d/1tZSIwEZCvTS1ucYn15auZbClAZKTTKga/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20135 [article]

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Versatile and valuable / Misty Huang in ADHESIVES AGE, Vol. 45, N° 4 (04/2002)

[article]  inADHESIVES AGE > Vol. 45, N° 4 (04/2002) . - p. 33-37 Titre : Versatile and valuable : The advantages of using isocyanatosilanes in adhesive and sealant applications Type de document : texte imprimé Auteurs : Misty Huang, Auteur ; Patrice Lehmann, Auteur ; Bruce Waldman, Auteur ; Fred Osterholtz, Auteur Année de publication : 2002 Article en page(s) : p. 33-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colles:Adhésifs Composés aliphatiques Isocyanates Joints d'étanchéité Liants Mastics Polyols Polyuréthanes Résistance au rayonnement ultraviolet Résistance aux conditions climatiques Résistance chimique Silanes Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The advantages of silane-modified polymeric binders have been recognized in coatings, adhesives and sealants markets. The increased accessibility of isocyanate silanes to the market will allow this technology to grow further, due to processing simplicity and applicability to a wide range of polymers. The use of isocyanate silanes and polyols to make precursors for elastomeric sealants generally provides silylated polymers with lower viscosity than that obtained by other methods. easier formulation and mixing is one benefit. As with conventional polyurethanes, the properties of these SPUR polymers can be tailor-made to range from low modulus to high modulus to meet the demands of different markets. These silane-terminated prepolymers may be used for formulating on-part room temperature moisture-cure sealants or adhesives with identified benefits such as superior adhesion performance, UV stability/weatherability and chemical resistance. Moreover, the characteristic of relatively fast cure makes the isocyanate silane-capped SPUR technology worth examining for insulated glass and automotive windshield sealant applications. The aliphatic isocyanate groups of Silquest A-Link 35 and Silquest A-Link 25 silanes allow them to be used in the modification of a wide range of polymers that contain functional groups of OH, SH and NH2. The modification process can be carried out in different types of apparatus. The silane-modified polymers provide the enhanced mechanical properties, excellent adhesion and improved high-fail temperature in shear that can especially beneficial to hot melt adhesives. Note de contenu : - Preparation of sealants based on SPUR prepolymers - Property and performance testing - A simple process for making silane-modified polymers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20001 [article]

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