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PAINTINDIA . Vol. XLVIII, N° 11Mention de date : 11/1998Paru le : 15/11/1998 |
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Ajouter le résultat dans votre panierThe 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 Cycloaliphatic versus aromatic amine expoxy hardeners / H. A. Monteiro in PAINTINDIA, Vol. XLVIII, N° 11 (11/1998)
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Titre : Cycloaliphatic versus aromatic amine expoxy hardeners Type de document : texte imprimé Auteurs : H. A. Monteiro, Auteur Année de publication : 1998 Article en page(s) : p. 39-42 Langues : Anglais (eng) Tags : Durcissant Diamine Polyamine 'Composé aliphatique' aromatique' 'Propriété physicochimique' 'Epoxyde résine' 'Etude comparative' Index. décimale : 667.9 Revêtements et enduits Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13180
in PAINTINDIA > Vol. XLVIII, N° 11 (11/1998) . - p. 39-42[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006481 - Périodique Bibliothèque principale Documentaires Disponible Acrylic-cellulose acetate butyrate automotive lacquers / D. A. Raval in PAINTINDIA, Vol. XLVIII, N° 11 (11/1998)
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Titre : Acrylic-cellulose acetate butyrate automotive lacquers Type de document : texte imprimé Auteurs : D. A. Raval, Auteur ; Ashok Dighe, Auteur ; T. J. M. Sinha, Auteur Année de publication : 1998 Article en page(s) : p. 43-46 Note générale : Bibliogr.
Langues : Anglais (eng) Tags : 'Matériau revêtement' Peinture Vernis 'Industrie automobile' Liant 'Méthacrylate méthyle copolymère' butyle' 'Cellulose acétobutyrate' Formulation 'Propriété physique' mécanique' Feuil Index. décimale : 667.9 Revêtements et enduits Résumé : Automotive lacquers were prepared in the laboratory using copolymers of methyl methacrylate and butylmethacrylate (in varying weight ratios) in combination with cellulose acetate butyrate, castor oil base plasticiser, linear plasticiser, solvents and pigments. Note de contenu : - EXPERIMENTAL : Materials : Present studies were performed with - Introduction of lacquer manufacture - Upgrading the mechanical properties of lacquers - Compatibility test - Preparation of pigmented lacquers - A characteristics of a NC lacquer
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13181
in PAINTINDIA > Vol. XLVIII, N° 11 (11/1998) . - p. 43-46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006481 - Périodique Bibliothèque principale Documentaires Disponible Polymeric encapsulation of pigment/extender in water based paint / S. R. Mohapatra in PAINTINDIA, Vol. XLVIII, N° 11 (11/1998)
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Titre : Polymeric encapsulation of pigment/extender in water based paint Type de document : texte imprimé Auteurs : S. R. Mohapatra, Auteur ; B. S. Sitaram, Auteur Année de publication : 1998 Article en page(s) : p. 47-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture eau' Pigment 'Matière charge' Encapsulation Polymère Index. décimale : 667.9 Revêtements et enduits Résumé : For the last few years, the reduction of polluting components in paints has become an issue of increasing importance, due to the fact public opinion shows a tendency towards the conservation of nature and its environment. This increasing environmental concern has led to more legal restrictions, to reduce organic solvent emissions in paints. Hence, organic solvents, as the most important Polluting component, need to be replaced. But the replacement of solvents by water in emulsion paints causes loss in gloss, agglomeration of pigment and extender particles.
In the present study clay (extender) was encapsulated by different polymers and used as an extender in 2EHA-MMA based emulsion paint. Different properties of emulsion paints are studied with respect to non encapsulated clay containing an emulsion paint.Note de contenu : - Experimental : - Clay encapsulated by melamine-formaldehyde resin - Clay encapsulated by MMA (Methyl methacrylate) - Clay encapsulated by HMDA 5hexamethylene diamines) and HMDI (Hexamethylene-di-isocyanate) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13183
in PAINTINDIA > Vol. XLVIII, N° 11 (11/1998) . - p. 47-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006481 - Périodique Bibliothèque principale Documentaires Disponible Inks and processes for gravure printing / David Fishman in PAINTINDIA, Vol. XLVIII, N° 11 (11/1998)
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Titre : Inks and processes for gravure printing Type de document : texte imprimé Auteurs : David Fishman, Auteur Année de publication : 1998 Article en page(s) : p. 67-70 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Gravure presses are used to print paper and foil substrates and some plastic films. Extensible films (polyethylene) are better printed flexographically. While the are some sheet gravure presses for speciality printing in short run lengths, most are rotary web presses, hence the name 'Rotogravure' Note de contenu : - Inks for gravure
- Gravure statusPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13185
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Code-barres Cote Support Localisation Section Disponibilité 006481 - Périodique Bibliothèque principale Documentaires Disponible
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