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Partager le résultat de cette rechercheNew polymeric polyol for thermoset coatings / J. Frederic Walker in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 928 (05/2002)
Titre : New polymeric polyol for thermoset coatings : Superacid-catalyzed copolymerization of water and epoxy resins Type de document : texte imprimé Auteurs : J. Frederic Walker, Auteur ; John B. Dickenson, Auteur ; Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; Renee Keller, Auteur Année de publication : 2002 Article en page(s) : p. 33-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Feuil Propriété mécanique physique chimique Polymérisation solution Ether Bisphénol A Eau Copolymérisation émulsion Polyol Superacide Catalyse acide Epoxyde résine Liant Formulation Thermodurcissable Peinture Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Though free-radical emulsion polymerization has been studied extensively, published reports of cationic (i.e., acid-catalyzed) polymerizations of emulsified monomers are rare. It was recently discovered that treatment of an emulsion of liquid epoxy resin with select superacid catalysts yields a polymeric polyol. Catalysis with one percent perchloric acid at room temperature yields a product with a number average molecular weight of 1650, and a polydispersity of 5.0 as measured by GPC. The polyol's structure differs from that of conventional high molecular weight epoxy resins prepared by the advancement process in several ways, including the incorporation of two glycidyl units in the repeat unit. In essence, the product is a copolymer of the epoxy resin and water, in which water is incorporated in the repeat unit structure by reaction with two epoxide groups. A similar product can be prepared by solution polymerization, where the molecular weight is controlled by the ratio of water to epoxy resin. The product was shown to have lower levels of residual bisphentol-A diglycidyl ether (BADGE) and bisphenol-A than conventional advanced epoxy resins. Polyols prepared by these new processes were crosslinked with melamine-formaldehyde resins in waterborne coating formulations which were free of added cosolvent, as well as solventborne coating formulations. The coatings de veloped excellent solvent resistance at lower bake temperatures than traditional epoxy resins. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5648
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 928 (05/2002) . - p. 33-47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001239 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Catalytic curing of industrial OEM coatings - Part I Type de document : texte imprimé Auteurs : D. S. Hardas, Auteur ; K. S. Samuel, Auteur Année de publication : 1995 Article en page(s) : p. 21-26 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture Durcissement 'Formation film' 'Amine polymère' Réticulation Polyol Catalyseur Index. décimale : 667.9 Revêtements et enduits Résumé : The importance of catalysts in surface coatings is immeasurable. Catalysts are widely used in the synthesis of coating polymers like alkyds, aminos, silicons, etc, and pigments like copper phtalo-cyanines, quinacridones, perylenes, etc. Their use in the curing of coatings results in not only the product improvement but energy saving and low VOC. the scope of this review paper is to highlight the important aspects of catalysts in industrial OEM coatings. Note de contenu : - Catalysts : Why catalist is required ?
- Catalysis in OEM coatings
- Polyol amino systems
- Why catalyst is required in this system ?
- Catalysts used in polyol-amino coating systems
- Resin characteristics and catalysts
- Kinetic parameters of catalysis
- Diffusion considerations
- Reaction mechanism of catalysis and film formation : Weak acid catalysis - Strong acid catalysis - Alkaline catalysis - Parallel reactionsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13642
in PAINTINDIA > Vol. XLV, N° 6 (06/1995) . - p. 21-26[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006452 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Applicability and WLF equation to polyurethane polyols and film properties of their resins Type de document : texte imprimé Auteurs : Syed Haseebuddin, Auteur ; K. V. S. N. Raju, Auteur ; M. Yaseen, Auteur Année de publication : 1995 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture haute teneur solide' Liant 'Uréthanne polymère' Polyol Préparation 'Propriété rhéologique' Viscosité 'Composé organique volatil' Formulation 'Température transition vitreuse' mécanique' Feuil 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : The need to reduce solvent content of coatings in compliance to air pollution and other Statutory Regulations has led to major efforts to develop high solids coatings. The reduction in molecular weight helps to achieve application viscosity by an increase in free volume. Various polyurethane polyols have been synthesised by reacting the diols with polyisocyanates. The molecular weight and polydispersity indexes of these polyols have been determined by gel permeation chromatography (GPC). The viscosity of 50%. polyol solutions in various solvents has been determined at different temperatures. The temperature dependence on viscosity of solution of these polyols has been determined by the Williams, Landel and Ferry (WLF) equation. The non-linear regression analysis has been solved by using Levenberg Marquardt's algorithm. It is found that non-linear regression analysis gives high correlation coefficients and very low overall residual errors. The variation in the values of constants A and B for each WLF equation in the polyol solution indicates that these constants are system dependent. The values of constants A and B obtained for polyurethane polyols in a particular solvent have been used to calculate the values of glass transition temperature of the oligomer solution (Tg,) at different concentrations. The values of Tg, are found to vary with concentration. As the concentration of polymer increases there is an increase in the Tg, value. The tensile properties and resistance to scratch of resins prepared using these polyols and butylated melamine formaldehyde are better than those of conventional resins. The VOC content of these coating formulations is lower than the value prescribed by the Environmental Protection Agency (EPA). Note de contenu : - Experimental : Viscosity determinations - Equations used for analysing viscosity data - Preparation of coating formulations - Determination of VOC
- Results and Discussion : Applicability of WLF equation - Temperature dependency of viscosity - Volatile organic component (VOC) - Properties of the baked coatings of the resin - Tensile propertiesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13691
in PAINTINDIA > Vol. XLV, N° 12 (12/1995) . - p. 55-59[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006459 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Crosslinking with malonate blocked isocyanates and with melamine resins Type de document : texte imprimé Auteurs : Z. Alex He, Auteur ; Werner J. Blank, Auteur Année de publication : 1999 Article en page(s) : p. 85-90 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Industrie automobile' 'Matériau revêtement' Vernis Peinture Durcissement Réticulation 'Mécanisme réaction' 'Isocyanate polymère' 'Copolymère réticulé' 'Mélamine résine' 'Malonique dérivé Polyol Index. décimale : 667.9 Revêtements et enduits Résumé : Automotive clearcoats with improved acid etch resistance are being formulated using a combination of a dialkyl malonate blocked polyisocyanate, a melamine crosslinker, and an acrylic polyol. These coatings contain lower levels of melamine crosslinker compared to conventional acrylic/HMMM systems and show excellent acid etch resistance. We explored the reaction mechanism of this complex crosslinking system and found explanations for the good chemical resistance properties. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17841
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 889 (02/1999) . - p. 85-90[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003558 - Périodique Bibliothèque principale Documentaires Disponible 009603 - Périodique Bibliothèque principale Documentaires Exclu du prêt 
Titre : Cutting the crosslinker : 2-pack wood finish offers good performance at low isocyanate levels Type de document : texte imprimé Année de publication : 2010 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polyuréthanes
Revêtements en phase aqueuse:Peinture en phase aqueuseTags : Revêtement 'Emulsion polyuréthane' Dispersion Polyol Formulation Isocyanate Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of two key formulation variables on two-pack waterborne polyurethane coatings based on a specific polyol dispersion were examined. Variations in the level or type of coalescing solvent had little effect on film properties. The dispersion also produced good film properties with little change in performance across a wide range of isocyanate addition levels. Note de contenu : - Key effects of main formulation variables.
- Test methods summarised.
- Chemical resistance and cold checking tested on wood.
- Effects of coalescing solvent on MFFT summarised.
- Coalescent strongly affects viscosity stability.
- Coalescents modify foaming behaviour and hardness.
- High tolerance for variations inn isocyanate levels.
- High performance, economy and formulating flexibility.En ligne : https://drive.google.com/file/d/1K-kUQrqTfA4C-VSz54FdPcjWq-yGw-jb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9607
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 06/2010 (06/2010)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012229 - Périodique Bibliothèque principale Documentaires Disponible
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