Water vapor transmission properties of acrylic organic coatings / Réka Lilla Kovács in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 523-534 Titre : Water vapor transmission properties of acrylic organic coatings Type de document : texte imprimé Auteurs : Réka Lilla Kovács, Auteur ; Lajos Daróczi, Auteur ; Péter Barkóczy, Auteur ; Eszter Bakonyi, Auteur ; Szilvia Kovàcs, Auteur ; Zoltàn Erdélyi, Auteur Année de publication : 2021 Article en page(s) : p. 523-534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Essais accélérés (technologie) Perméabilité Polyacryliques Revêtements organiques Solubilité Test d'immersion Transmission de vapeur d'humidité Vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, we evaluate the water vapor transmission rate (WVTR), the permeability (P), solubility (S), and diffusion (D) coefficients of Paraloid B44, Paraloid B72, and Incralac coatings in the temperature range of 5–35°C. The Arrhenius function—diffusion activation energy and preexponential factor—has also been determined from the data: DB44=35.2cm2s−1exp(−25kJ mol−1/RT); DB72=9.5cm2s−1exp(−23kJ mol−1/RT); DIncralac=622.8cm2s−1exp(−28kJ mol−1/RT). These resins are important coating materials, for example, for conservators to protect metallic artifacts, such as statues, against corrosion. Despite Paraloid B44 and B72 resins being considered as reference materials in conservation practice, that is, new coating materials (either water vapor retarders or transmitters) are often compared to them, there are no comprehensive data for the quantities describing the vapor permeability (P, S, D) of these materials. The measurements are based on the ISO cup-method using substrate/coating composite samples. The strength of this technique is that it can also be used when the coating is non-self-supporting; nevertheless, P, S, and D can be deduced for the coating layer itself, and it seems to be a standardizable procedure for comparative performance testing of coating materials. Paraloid B72 layers exhibited higher WVTRs—from 39 to 315 g m−2 day−1 as the temperature increased from 5 to 35°C—compared to Paraloid B44 and Incralac coatings—from 17 to 190 g m−2 day−1, respectively. The transmission rate parameters were also compared to the results of corrosion tests. Incralac was the most effective corrosion inhibitor, and the performance of the B44 was better than the B72, which is in good agreement with the transmission rate tests. Note de contenu : - MATERIALS AND METHODS - CALCULATIONS : Permeability - Solubility - Diffusion coefficient - RESULTS AND DISCUSSION : Water vapor transmission rate, solubility and diffusion coefficient - Immersion corrosion test - Table 1 : Diffusion activation energy and preexponential factors for the different resins determined from the Arrhenius plot - Table A1 : Measured water vapor transmission rate (WVTR) and total mass of absorbed vapor M1 for the laminated paper (substrate) and for substrate/resin coating composites - Table A2 : Calculated WVTRs, permeability, solubility/absorptivity, and diffusion coefficients for the resins DOI : https://doi.org/10.1007/s11998-020-00421-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00421-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35612 [article]

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