| Titre : |
Drying and cracking of soft latex coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Christine C. Roberts, Auteur ; Lorraine F. Francis, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 441-451 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Agrégats (chimie)
Couches minces
Latex
Microscopie électronique à balayage
Particules (matières)
Revêtement -- Séchage:Peinture -- Séchage
Revêtements -- Fissuration:Peinture -- Fissuration
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The minimum film formation temperature (MFFT) is the minimum drying temperature needed for a latex coating to coalesce into an optically clear, dense crack-free film. To better understand the interplay of forces near this critical temperature, cryogenic scanning electron microscopy (cryoSEM) was used to track the latex particle deformation and water migration in coatings dried at temperatures just above and below the MFFT. Although the latex particles completely coalesced at both temperatures by the end of the drying process, it was discovered that particle deformation during the early drying stages was drastically different. Below the MFFT, cracks initiated just as menisci began to recede into the packing of consolidated particles, whereas above the MFFT, partial particle deformation occurred before menisci entered the coating and cracks were not observed. The spacing between cracks measured in coatings dried at varying temperatures decreased with decreasing drying temperature near the MFFT, whereas it was independent of temperature below a critical temperature. Finally, the addition of small amounts of silica aggregates was found to lessen the cracking of latex coatings near the MFFT without adversely affecting their optical clarity. |
| Note de contenu : |
- METHODS AND MATERIALS : Materials - Cryogenic scanning electron microscopy - MFFT and crack spacing measurements - Contact angle measurements
- RESULTS : Macroscopic appearance - Microstructure development |
| DOI : |
10.1007/s11998-012-9425-7 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9425-7.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19094 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 4 (07/2013) . - p. 441-451
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Drying and cracking of soft latex coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)
