[article]
| Titre : |
Raising the bar for façade paints and plasters |
| Type de document : |
texte imprimé |
| Auteurs : |
Markus Vogel, Auteur ; Roger Reinartz, Auteur ; Daniel Brünink, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 36-38 |
| Langues : |
Anglais (eng) |
| Catégories : |
Applications extérieures
Formulation (Génie chimique)
Liants en phase aqueuse
Pigments organiques
Revêtements en bâtiment:Peinture en bâtiment
Revêtements en phase aqueuse:Peinture en phase aqueuse
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
For decades, façade paints have had two important functions : They lend an attractive appearance and offer protection from the effects of weathering. Therefore, producers of premium façade paints have worked hard to optimise these two properties in their products. Silicone resin paints are now state-of-the-art options for exterior applications. These paints contain emulsified silicone resins in addition to a primary binder, which is generally a styrene-acrylate dispersion. Such paints have excellent weathering resistance and a long service life.
Over the last few years, however, customer requirements have increased. The colour selection needs to be larger. The façade needs to be slower to soil than before and ail these performance characteristics need to be achieved by environmentally compatible means. Researchers at Evonik have now developed a silicone resin that meets these increased requirements : TEGO® Phobe 1659. As an added bonus, it can be used in significantly lower concentrations than the established alternatives, thus saving costs. |
| Note de contenu : |
- High water vapour diffusion, low water absorption
- Transmission electron microscopy
- Lower dirt pick-up
- Formulation with organic pigments
- Advantages in processing and storage
- Environmnetally compatible for broad market access
- Technology standard raised
- Fig. 1 : Water absorption of a silicone resin paint with various silicone resins
- Fig. 2 : Electron transmission micrograph of a silicone resin paint containing 2.0% TEGO Phobe 1659. Magnification: x 2000. Three areas can be distinguished, denoted in the image by I, II and III
- Fig. 3A : Electron transmission micrograph of a silicone resin paint with 4.8% of a commercially available standard. Magnification: x 4000. The silicone resin (dark coloured) is partly encapsulated by the primary binder
- Fig. 3B : Electron transmission micrograph of a silicone resin paint containing 4.8% TEGO Phobe 1659. Magnification: x 4000. Primary binder (light) and silicone resin (dark) are spatial!), separated from each other
- Fig. 4 : EDX of pigment particles. When TEGO Phobe 1659 is used, silicone (Si) is found in addition to titanium (Ta, which is not the case for the commercially available standard
- Fig. 5 : Tendency to soiling. Formulations based on TEGO Phobe 1659 show L values that are lower by up to 30% in the soiling test
- Fig. 6 : Tendency to soiling in the accelerated laboratory test
- Fig. 7 : Rub-out values after addition of 5% pigment concentrate
- Fig. 8 : Surface structure of plasters. Formulations based on TEGO Phobe 1659 show a more uniform surface structure with the same tiller package
- Fig. 9 : |
| En ligne : |
https://drive.google.com/file/d/1Uncfvr7u4QUZ-x2rJ9K8oJ4XqBHdsZQ9/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34454 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4664 (09/2020) . - p. 36-38
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