Effect of titania, barite, and kaolinite fillers on char layer formation in water-based intumescent fire-retardant coatings / Iben Hansen-Bruhn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1067-1075 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 Ignifugeants Composé 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 [article]

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Evaluation of compression strength of intumescent char using ASTM 1162 00 / Adiat I. Arogundade in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 935-943 Titre : Evaluation of compression strength of intumescent char using ASTM 1162 00 Type de document : texte imprimé Auteurs : Adiat I. Arogundade, Auteur ; Puteri S. M. Megat-Yussof, Auteur ; Lukmon O. Afolabi, Auteur Année de publication : 2021 Article en page(s) : p. 935-943 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Char (matériaux pyrolysé) Contraintes (mécanique) Essais dynamiques Evaluation Formulation (Génie chimique) Intumescence (chimie) Morphologie (matériaux) Résistance à la compression Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Intumescent coatings employ the heat barrier effect of an expanded char in the fire protection of the underlying substrates. The effectiveness of an intumescent system is dependent on the strength and ability of the char to remain intact upon exposure to fire. Many approaches have been employed to measure the strength of the intumescent char, but there still remains the need for an established standard procedure. In the present study, the compressive strengths of reinforced and unreinforced intumescent chars are evaluated using the compression test for cellular materials (ASTM 1162 00). This standard procedure enabled easy evaluation of compressive strength by employing the principle of deformation force as a function of the axial displacement of char under an active load by using the common universal tensile testing machine. The force–deformation graph revealed an exponentially increasing curve with two distinct regions, an initial region of low force to high deformation representing the collapse of the cellular pores and a high-force–low-deformation region attributed to the bulk mass effect of the compressed char. The results showed that the force needed to compress a bauxite residue-reinforced char to 10% deformation increased by 59%, while the compression strength increased by 13.08% over the control char. Note de contenu : - METHODOLOGY : List of materials - Material preparation and characterization - Compression test for cellular materials (ASTM 1620 00) - Comparing the microstructures of intumescent chars - Evaluating the heat shielding effects of intumescing chars - RESULTS AND DISCUSSION : Effects of char morphology on char strength - Results of Bunsen burner tests - Table 1 : Intumescent formulation - Table 2 : Values for mechanical properties of compressed chars DOI : https://doi.org/10.1007/s11998-020-00434-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00434-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35941 [article]

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