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Aqueous dispersions for ultraviolet light curable coatings / Jeffrey Wang in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 862 (11/1996)
[article]
Titre : Aqueous dispersions for ultraviolet light curable coatings Type de document : texte imprimé Auteurs : Jeffrey Wang, Auteur ; Jo Ann Arceneaux, Auteur ; Jodi Hall, Auteur Année de publication : 1996 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces
Dispersions et suspensions
Liants
Polyacrylates
Réticulation (polymérisation)
Revêtements
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet:Peinture en phase aqueuse -- Séchage sous rayonnement ultraviolet
Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Aqueous dispersions of ultraviolet light (UV) curable resins have been prepared and evaluated. The physical and rheological properties of these dispersions have been determined, and the performance of these dispersions in coating systems has been studied. Coatings based on these dispersions have faster UV cure speed, better surface hardness, and better flexibility compared with coatings based on undispersed resins. Note de contenu : - RESULTS AND DISCUSSION : Particle size - Rheological bahavior - Stability - Film performance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18452
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 862 (11/1996) . - p. 33-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003520 - Périodique Bibliothèque principale Documentaires Disponible 003531 - Périodique Bibliothèque principale Documentaires Exclu du prêt Aqueous finishing with polyisocyanate cross-linked binders / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
[article]
Titre : Aqueous finishing with polyisocyanate cross-linked binders Type de document : texte imprimé Auteurs : Lluis Ollé, Auteur ; M. Cobos, Auteur ; O. Solé, Auteur ; Anna Bacardit, Auteur Année de publication : 2009 Article en page(s) : p. 222-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition
Liants
Polyacryliques
Polyisocyanates
Polyuréthanes
Réactions chimiques
Réticulants
Réticulation (polymérisation)
Solutions aqueuses (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Due to increasingly stringent environmental legislation the leather industry has to produce eco-friendly articles. At the same time, it needs to manufacture fashionable and high-quality articles in order to increase competitiveness. As part of this, factories have to replace solvent-based products by water-based products in their finishing formulations to reduce the level of volatile organic compounds. The addition of a cross-linker is required in most cases in order to obtain high performance aqueous finishes. The aim of the present work is to explore the cross-linking reaction between polyisocyanate and both acrylic binders and polyurethanes.
A comparision of results shows that polyisocyanate presents a very fast reticulation (cross-linking) speed at room temperature and has a pot-life of only 4 hours. In order to obtain optimum fastness values, different amounts of polyisocyanate are required, the amounts depend on the type of leather used and the physical characteristics of the binders employed.Note de contenu : - FIGURES : 1. Reaction initiation of the isocyanate group - 2. Reaction between isocyanate and functional groups - 3. Diisocyanates most commonly used in industry - 4. Evolution of the cross-linking reaction of acrylic binders A over time. Chrome leather with chrome retanning. 25 wet rubs - 5. Comparaison between cross-linked acrylic binders on chrome leather with chrome retanning. 25 wet rubs, 7 days'storage - 6. Comparaison between cross-linked acrylic binders on vegetable leather. 25 wet rubs, 7 days'storage - 7.Comparaison between cross-linked acrylic binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage - 8. Comparaison between cross-linked polyurethane binders on chrome leather with chrome. 25 wet rubs, 7 days'storage - 9. Comparaison between cross-linked polyurethane binders on vegetable leather. 25 wet rubs, 7 days'storage - 10.Comparaison between cross-linked polyurethane binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage
- TABLES : 1. Coating formulations - 2. Physical characteristics of acrylic binders - 3. Physical characteristics of polyurethane binders - 4. Results of colour fastness to dry rubbing. Acrylic binders - 5. Results of colour fastness to wet rubbing. Acrylic binders - 6. Results of colour fastness to dry rubbing. Polyurethane binders - 7. Results of colour fastness to wet rubbing. Polyurethane binders - 8. Results of dry flex resistance - number of rubs x 1000 - 9. Results of wet flex resistance - number of rubs x 1000 - 10. Determination of binder acidityEn ligne : https://drive.google.com/file/d/17et4UOXjaozggPe2HNaiDqR7M_LV0Miu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25650
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 222-228[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011791 - Périodique Bibliothèque principale Documentaires Disponible Aqueous two-pack PU clear coats / Lothar Kahl in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/96 (11/1996)
[article]
Titre : Aqueous two-pack PU clear coats : A promising development in solvent-borne technology Type de document : texte imprimé Auteurs : Lothar Kahl, Auteur ; Manfred Bock, Auteur ; Eberhard Jürgens, Auteur ; Hans Josef Laas, Auteur Année de publication : 1996 Article en page(s) : p. 800-808 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Vernis
Matières premières
Polyuréthanes
Réticulation (polymérisation)
Revêtements bi-composantIndex. décimale : 667.9 Revêtements et enduits Résumé : Aqueous two-pack clear coats have become an alternative for solvent-borne systems. The following article presents and discusses the raw materials and the characteristics of the coatings in the context of automotive applications. Crosslinking reactions are also described, as well as technology for the optimum mixing of the components. Note de contenu : - The chemistry of aqueous two-pack PU clear coats
- The reaction behaviour of stoving coatings
- Stability of the mixed two-pack coating
- Application window
- Comparison of film properties
- Mixing technology for aqueous two-pack PU clear coatsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11380
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 11/96 (11/1996) . - p. 800-808[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002521 - Périodique Bibliothèque principale Documentaires Disponible Ascorbic acid ester in ambient temperature cure coatings / Amy C. Sheets in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 2 (03/2012)
[article]
Titre : Ascorbic acid ester in ambient temperature cure coatings Type de document : texte imprimé Auteurs : Amy C. Sheets, Auteur ; Jennifer T. Otto, Auteur ; David L. Trumbo, Auteur Année de publication : 2012 Article en page(s) : p. 219–222 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages.
Ascorbique, Acide
Ester acétoacétate
Réticulation (polymérisation)
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Ascorbic acid was reacted with t-butyl acetoacetate under relatively mild conditions to obtain a multifunctional ?-ketoester. 1H-NMR spectroscopy and elemental analysis showed that the high-yield desired product was obtained and with a degree of substitution between 2 and 3. This ?-ketoester was used to make a simple coatings mixture, which was, in turn, used to coat metal panels. Crosslinking was attempted using multifunctional amines, but this proved to be too rapid for any reasonable films to be made. Michael addition with multifunctional acrylates proved to be controllable by adjusting the catalyst level. The films obtained proved to have high levels of solvent resistance, high hardness, good gloss, and low impact strength. Gel content measurements and large increases in the glass transition temperature (T g) of the cured films indicated that high levels of crosslinking have been obtained. Note de contenu : - Coating formulations
- b-Ketoester synthesis
DOI : 10.1007/s11998-010-9251-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-010-9251-8.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14375
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 2 (03/2012) . - p. 219–222[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14096 - Périodique Bibliothèque principale Documentaires Disponible Assessment of relative reactivities and kinetics of various polyamine and polyamide hardeners with epoxy resins for designing high performance epoxy coatings using differential scanning calorimetry / Girish Mirchandani in PAINTINDIA, Vol. LVII, N° 6 (06/2007)
[article]
Titre : Assessment of relative reactivities and kinetics of various polyamine and polyamide hardeners with epoxy resins for designing high performance epoxy coatings using differential scanning calorimetry Type de document : texte imprimé Auteurs : Girish Mirchandani, Auteur Année de publication : 2007 Article en page(s) : p. 69-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Calorimétrie
Epoxydes
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Polyamines
Réticulants
Réticulation (polymérisation)
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : High performance epoxy coatings have to be designed correctly in order to give corrosion protection in hostile environmental conditions. There needs to be a scientific method to accurately determine the reactivity of complex hardeners or a mixture of different hardeners in order to compare them with existing systems and select the correct curing agent for a given epoxy resin. While it may be easy to predict the reactivity of simple hardeners (short chain polyamines) of known chemical structures, the same is not possible for proprietary hardeners of unknown structures. The selection of hardener on the basis of amine value and certain theoretical rules is a misnomer and actual working conditions such as steric hindrance and catalytic effects need to be taken into account. The aim of this paper is to investigate and quantify the relative reactivities of different hardeners and study the curing kinetics of two-component epoxy coatings. Various kinetic parameters (activation energy E, pre-exponential factor A, order of reaction n and rate constant k) have been determined. The kinetic parameters help us to understand the reaction at a molecular level. The differential scanning calorimeter (DSC) was used to determine these parameters. The study has been used to investigate the effect of the amine molecular structure on the reactivity with epoxy resin. The epoxy resin used was diglycidyl ether of bisphenol A (DGEBA) having an EEW of 187 g/equ. Four different curing agents; an aliphatic, cycloaliphatic and aromatic polyamine along with a polyamide (based on dimer fatty acid and polyamine) have been selected for the study. Using kinetic modeling, the reaction mechanism was determined and found to be dependent on molecular mobility, steric hindrance and phase heterogeneity of reactants and cured network. The reaction mechanism changes from autocatalytic for the DGEBA-polyamine system to non-catalytic for the DGEBA-polyamide system. The kinetic model helps us to predict the extent of reaction as a function of time at any temperature. The techniques presented in this paper can be used to design better corrosion resistant coating systems. Note de contenu : - Dynamic experiments
- Isothermal experiments
- Relative reactivity of the hardeners (from isothermal experiments)
- Reaction mechanism (from isothermal experiments)
- Kinetic modeling (to verify autocatalytic and non-catalytic reaction mechanism)
- Kinetic parameters : order of reaction (n et m) and rate constant k
- Activation energy (E) and frequency factor (A)
- Prediction of gel time at any temperature (through kinetic modeling)
- Calculation of optimum curing agent concentration by DSCPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11478
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Code-barres Cote Support Localisation Section Disponibilité 008400 - Périodique Bibliothèque principale Documentaires Disponible Attributing the crosslinking density to water vapor transmission rate of an acrylic-melamine automotive clearcoat / M. Nasirzadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)
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