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The selectivity of isophorone diisocyanate in the urethane reaction / R. Lomoelder in PAINTINDIA, Vol. XLVIII, N° 11 (11/1998)
[article]
Titre : The selectivity of isophorone diisocyanate in the urethane reaction : Influence of temperature, catalysis and reaction partners Type de document : texte imprimé Auteurs : R. Lomoelder, Auteur ; F. Plogmann, Auteur ; P. Speier, Auteur Année de publication : 1998 Article en page(s) : p. 31-38 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Polyuréthane' 'Diisocyanate organique' 'Cyclohexane dérivé' Polyaddition Diol 'Réaction catalytique' modèle' 'Activité 'Sélectivité catalyseur' Régiosélectivité 'Acide Lewis' 'Métal Composé' 'Base 'Amine tertiaire' 'Effet température' 'Etude expérimentale' comparative' Index. décimale : 667.9 Revêtements et enduits Résumé : The selectivity of isophorone diisocyanate (IPDI) in the urethane reaction demonstrates a strong dependence on temperature, catalyst type, and degrees of substitution of the reaction partner. It was possible to establish, by means of GC analysis of the monomer content, that dibutyltin dilaurate (DBTL) leads to the highest selectivity compared to the series of Sn, Zn, Bi, Fe, and amine catalysts. The ratio ofthe rate constant Γin the model reaction with 1-butanol at 20°C was increased from 5.5 in the uncatalyzed variant to 11.5 by catalysis with DBTL. The use of diazabicyclooctane succeeded in reversing the selectivity. The selectivity under DBTL catalysis dropped from 11.5 at 20°C to 6.5 at 100°C. The use of 2-butanol leads to a further increase in selectivity: Γ= 17 with DBTL catalysis at 20°C. By the resolution of all four monourethanes by GC analysis of the 1-butanol reaction, a significantly higher selectivity of trans IPDI was established: the ratio of secondary monourethane to primary monourethane with trans IPDI is higher by a factor of 2. A very good correlation between prepolymer synthesis and the model reactions was observed. Recommended optimal conditions for prepolymer synthesis based on IPDI are temperatures between 40°C to 60°C using DBTL catalysis. Note de contenu : - Selectivity of IPDI by application of various urethane catalysts
- Influence of temperature on the selectivity of IPDI - Additional steric hindrance : 2-butanol - Back to the pratical : NCO prepolymersPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13179
in PAINTINDIA > Vol. XLVIII, N° 11 (11/1998) . - p. 31-38[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006481 - Périodique Bibliothèque principale Documentaires Disponible UV curable, liquid diacrylate monomers based on (cis,trans)-1,3/1,4-cyclohexanedimethanol / Kiran K. Baikerikar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 2 (03/2010)
[article]
Titre : UV curable, liquid diacrylate monomers based on (cis,trans)-1,3/1,4-cyclohexanedimethanol Type de document : texte imprimé Auteurs : Kiran K. Baikerikar, Auteur ; Michael L. Tulchinsky, Auteur ; John Argyropoulos, Auteur Année de publication : 2010 Article en page(s) : p. 175-188 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Cyclohexane diméthanol diacrylate' Peinture 'Séchage UV' Cycloaliphatique Monomère Index. décimale : 667.9 Revêtements et enduits Résumé : Novel, liquid cycloaliphatic diacrylate monomers based on (cis,trans)-1,3/1,4-cyclohexanedimethanol have been synthesized for use in ultraviolet (UV)- and electron beam (EB)-cured coatings, inks, and adhesives. Diacrylate monomers prepared from this unique diol, and containing less than 15 wt% trans-1,4-cyclohexanedimethanol diacrylate, are liquid at room temperature and readily soluble in other acrylate monomers and oligomers (in contrast to diacrylates prepared from 1,4-cyclohexanedimethanol, which are solid). More importantly, UV-cured coatings based on (cis,trans)-1,3/1,4-cyclohexanedimethanol diacrylates (1,3/1,4-CHDMDA) show superior hardness, scratch resistance, and chemical resistance as compared to common diacrylate monomers used in the UV coating industry such as tripropylene glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, and propoxylated neopentyl glycol diacrylate. Thus, this new monomer appears to be a promising material for enhancing the performance of radiation-cured coatings, inks, and adhesives applied to a variety of substrates, including plastic, paper, wood, metal, and glass. This paper will summarize the synthesis of liquid diacrylates from (cis,trans)-1,3/1,4-cyclohexanedimethanol, as well as the performance properties of the corresponding UV-cured coatings. DOI : 10.1007/s11998-009-9185-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9185-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9064
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 2 (03/2010) . - p. 175-188[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012083 - Périodique Bibliothèque principale Documentaires Disponible Vestanat IPDI / Dirk Reichel in PAINTINDIA, ANNUAL 1999 (04/1998)
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Titre : Vestanat IPDI Type de document : texte imprimé Auteurs : Dirk Reichel, Auteur Année de publication : 1998 Article en page(s) : p. 41-48 Langues : Anglais (eng) Tags : 'Diisocyanate organique' 'Cyclohexane dérivé' 'Réactivité chimique' Polyaddition Polyol 'Réaction catalytique' 'Urée Polyuréthane Prépolymère 'Alkyde résine' 'Polymère réticulé' 'Matériau revêtement' 'Propriété physicochimique' 'Isophorone diisocyanate' Index. décimale : 667.9 Revêtements et enduits Résumé : The different reactivity of the aliphatic and cycloaliphatic isocyanate group of Vestanat IPDI (isophorone diisocyanate) using various catalysts is presented. DBTL proved to be the most suitable catalyst for prepolymer synthesis - which is ideally performed at 40-60°C- under consideration of viscosity, monomer content and economical reasons. IPDI prepolymers based on various polymeric polyols were synthesized and their viscosity and content of monomeric IPDI was determined. Using these advantages Vestanat IPDI is the ideal isocyanate for the creation of light stable coatings based on PU-dispersions. By means of experimental data the formation and properties of PU-dispersions and coatings obtained from them is discussed. Vestanat T 1890 is the isocyanurate-trimer of IPDI and widely used as hardener in 2-pack polyurethane systems. The properties and application of Vestanat T 1890 in this field is described with special focus on alkyd resins and blending of HDI-trimer with IPDI-trimer. Non-drying short- and medium oil alkyds as well as air-drying medium-and long oil alkyds can be combined with Vestanat T 1890. By means of a short oil coco alkyd the advantages of this technique are presented. A coating with superior performance is obtained which shows comparable properties to 2-pack acrylic-PU systems. Air-drying alkyds, when combined with Vestanat T 1890 as reactive diluent, show a significant shorter dust-free time and superior weathering durability. Blending of HDI-trimer with Vestanat T 1890 has many advantages which is also presented by means of experimental data. Without change of pot-life not only a shorter dust-free time can be achieved but also the acid etch resistance is improved significantly. Note de contenu : - Reactivity and selectivity of IPDI
- Isocyanate prepolymers based on IPDI
- IPDI in polyurethane dispersions
- IPDI-trimer in 2-pack PU coatings
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13083
in PAINTINDIA > ANNUAL 1999 (04/1998) . - p. 41-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006484 - Périodique Bibliothèque principale Documentaires Disponible