[article]
| Titre : |
Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Iben Hansen-Bruhn, Auteur ; Anne Vetter Poulsen, Auteur ; Ulrik Abildgaard, Auteur ; Jens Bomholdt Ravnsbæk, Auteur ; Mogens Hinge, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 1067-1075 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Barytine La barytine (ou baryte, voir les synonymes) est une espèce minérale composée de sulfate de baryum de formule BaSO4 avec des traces de Sr, Ca et Pb. Ce minéral, d'origine hydrothermale, présente de nombreuses variétés. Sa densité et le baryum qu'il contient sont les causes principales de ses utilisations industrielles et plusieurs millions de tonnes de barytine sont extraits et produits chaque année. (Wikipedia)
Char (matériaux pyrolysé)
Charges (matériaux)
Dioxyde de titane
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Kaolinite
Revêtements en phase aqueuse
Revêtements protecteurs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Intumescent fire-retardant coatings are widely applied as they combine designable aesthetics and fire protection without compromising substrate properties. When exposed to heat, intumescent fire-retardant coatings expand and build an insulating char. This study presents an investigation of the char by addition of kaolinite, barite, and titania as functional fillers in intumescent coatings. Expansion experiments at 400°C with custom build image analysis showed that kaolinite inhibited (0.03 mm/s, expansion factor ≈ 7), whereas barite acted synergistically on the expansion ability (0.59 mm/s, expansion factor ≈ 85). The resulting char density and the visual inspection showed that barite char was less compact, with cracks and voids. Evaluation of fire performance by single burning item tests resulted in Euroclass C for the barite system and Euroclass A2/B for the titania system. Post-heating chars demonstrated poor thermostability of barite char, and subsequent FTIR spectroscopy revealed that titania char formed the thermostable titanium pyrophosphate. Further inspection of the titania char revealed a uniform closed cell structure with mean bubble sizes of 26–56 µm. Titania coating expands rapidly (0.37 mm/s, expansion factor ≈ 60) and forms a structurally stable tumescent char with a compact and uniform porous structure exhibiting resistance to char oxidation at sustained heating. |
| Note de contenu : |
- Coating preparation
- Sample preparation and coating thickness
- Fourier transform infrared spectroscopy
- Char expansion rate
- Image analysis
- Char density
- High temperature char degradation
- Fire performance
- Scanning electron microscopy
- Table 1: Intumescence characteristics. Extracted parameters from image analysis and measured char density. α: Expansion rate, β: Expansion factor, ρ: Density, H: Char height, and t: Time
- Table 2 : SBI results of titania, barite, and FR coatings. FIGRA: Fire growth index at 0.2 MJ and 0.4 MJ, respectively. THR: Total heat release after 600 s test time. SMOGRA: Smoke growth index. TSP: Total smoke production after 600 s test time |
| DOI : |
https://doi.org/10.1007/s11998-021-00585-8 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-021-00585-8.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38036 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1067-1075
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Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
