| Titre : |
Expanding the coating formulators toolbox by using chemo-rheological models |
| Type de document : |
texte imprimé |
| Auteurs : |
Fabio Aguirre, Auteur ; Adam Grzesiak, Auteur ; Asjad Shafi, Auteur ; Yohannes Ghirmazion, Auteur |
| Année de publication : |
2018 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Rhéologie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Dow Polyurethanes strives to provide the information customers need to guide the selection of raw materials for their formulations and targeted applications. The information is tailored for formulators that use first principles as well as for those that only need the data required to balance the stoichiometry of their systems.
To improve our customer’s experience we have developed searching and modeling tools that would allow formulators not only to quickly find the components they need but also to predict the viscosity of basic prepolymers and quasi-prepolymers.
We have also developed other modeling tools capable of predicting the curing time and viscosity buildup of coating systems in a broad range of seasonal temperatures. In this paper, we demonstrate some of the capabilities that can be used by formulators to select polyols based on first principles. Also discussed are the fundamentals behind the mechanistic models that predict prepolymer viscosity as a function of temperature, as well as curing profiles of coating systems at several temperatures as a function of time. |
| Note de contenu : |
- EXPERIMENTAL : DSC Conditions - Rheology testing - Cure profile
- RESULTS AND DISCUSSION : Physical and mechanical properties - DSC results - Rheology results - Cure profile measured via coefficient of friction as F(T) - Kinetic modeling of curing reactions - Rheology modeling - Application of kinetic models
- Fig. 1 : Key to six-digit product numbers for VORANOLTM polyether polyols
- Fig. 2 : Interactive tool based on the six-digit product numbers to select VORANOL polyols
- Fig. 3 : Interactive model to prepare prepolymers based on VORANOL polyols
- Fig. 4 : Predicted prepolymer viscosity versus temperature
- Fig. 5 : DSC at 1°C/min using precooled components
- Fig. 6 : DSC at 2 °C/min using precooled components
- Fig. 7 : Rheology data at 1 °C/min using precooled components
- Fig. 8 : Curing of 2K PU coating system by coefficient of friction (CoF)
- Fig. 9 : Predicted and experimental values of reaction rates (blue) and degree of cure (red) for 1 and 2 °C/min dynamic DSC scans
- Fig. 10 : Factors that influence the viscosity of prepolymer
- Fig. 11 : Phase diagram of elastomeric polyurethanes
- Fig. 12 : Viscosity as a function of time during dynamic scan at 1 °C/min
- Table 1 : Analytical results of 2K formulation
- Table 2 : Modulated DSC at 1 °C/min and 2 °C/min
- Table 3 : Reactivity and physical testing results of developmental formulation
- Table 4 : Kinetic parameters estimated from DSC data |
| En ligne : |
https://www.coatingsworld.com/issues/2018-12-01/view_features/expanding-the-coat [...] |
| Format de la ressource électronique : |
Html |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32512 |
in COATINGS WORLD > Vol. 23, N° 12 (12/2018)
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Ajouter le résultat dans votre panierExpanding the coating formulators toolbox by using chemo-rheological models / Fabio Aguirre in COATINGS WORLD, Vol. 23, N° 12 (12/2018)
