| Titre : |
Cutting down shrinkage |
| Type de document : |
texte imprimé |
| Auteurs : |
Ulrich Nagorny, Auteur ; Paul Birnbrich, Auteur ; Hans-Josef Thomas, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 28-32 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Epoxydes
Formulation (Génie chimique)
Réticulants
Retrait volumique
Revêtements en phase aqueuse:Peinture en phase aqueuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The author explain how dimensionally stable low-shrinkage coatings can be produced with the help of new modified curing agents.
The measuring results reveal that nowadays modern water-dilutable epoxy systems allow thick-film and dimensionally-stable, low-shrink coatings. It has been shown that the formulation largely influences the result. However, the formulator is easily able to achieve the expected results for coatings by means of a new modified curing agent. It has to be emphasised that practice-oriented values are attainable even at - for aqueous systems unfavourable temperature conditions of 8°C and increased atmospheric moisture. This way, the demands raised by the user for practical, thick-film protective coatings are fulfiled. The same applies to legal and ecological demands for the solvent and VOC-content of the formulation. |
| Note de contenu : |
- Causes of shrinkage
- Significance of shrinkage for the application
- Dimensionally stable, shape-retentive aqueous epoxy coatings
- FIGURES : 1. Film formation in a two-component aqueous epoxy resin coating - 2. Example of low (front) and intense (back) tension build-up by shrinkage of a water-based floor coating material (3 X20 X 150 mm) after drying and curing - 3. Tension buildup (Rilato effect) of thick-film specimen (100 X 10 X 10 mm) - 4. Water-diluable epoxy curing agent with 5-5 % shrinkage in the coating - 5. Modern water-diluable epoxy curing agent with shrinkage below 1.5 percent in the coating - 6. Comparison of total shrinkage of different curing agents in formulation 1 - 7. Comparison of total shrinkage of different curing agents in formulation 2 - 8. Comparison of total shrinkage of different curing agents in formulation 2 - 9. Hardening process of selected curing agents in formulation 3 |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27725 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 194, N° 4479 (08/2004) . - p. 28-32
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