Silica aerogel-encapsulated biocide crystals for low-loading antifouling coatings : rheology, water absorption, hardness, and biofouling protection / Tenna Frydenberg in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 935-947 Titre : Silica aerogel-encapsulated biocide crystals for low-loading antifouling coatings : rheology, water absorption, hardness, and biofouling protection Type de document : texte imprimé Auteurs : Tenna Frydenberg, Auteur ; Claus Erik Weinell, Auteur ; Kim Dam-Johansen, Auteur ; Eva Wallström, Auteur ; Søren Kiil, Auteur Année de publication : 2023 Article en page(s) : p. 935-947 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aérogels Caractérisation Encapsulation Formulation (Génie chimique) Humidité -- Absorption:Eau -- Absorption Pyrithione de cuivre Résistance à la salissure Revêtements antisalissures Rhéologie Silice La 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 : To protect surfaces against marine biofouling, the continuous leaching of biocides, such as cuprous oxide (Cu2O) and copper pyrithione (CuPT), from antifouling coatings is a widespread and effective method. However, from an environmental and economic perspective (costs of raw materials), a high biocide loading of formulations is not sustainable. Silica aerogel-encapsulated CuPT is a promising approach to reduce Cu2O and CuPT loadings without compromising the mechanical properties and antifouling performance of the coating. In the present study, silica aerogels, with varying CuPT loadings, were incorporated into model coating formulations, and selected coating properties, i.e., rheology, water absorption, and hardness, were measured and evaluated. Furthermore, to demonstrate antifouling performance, static exposure testing with the aerogel-containing coatings was performed. The level of CuPT loading of the silica aerogels did not have a significant influence on neither the water absorption nor the rheology of the coating. However, an increase in the CuPT loading of the aerogel from 0 to 80 wt% reduced the coating’s pendulum hardness from 61 to 37 s. Additionally, compared to a reference coating with nonencapsulated CuPT, results demonstrate that a coating containing silica aerogel-encapsulated CuPT provides a 17% higher antifouling resistance when evaluated according to guidance from The European Chemicals Agency. Note de contenu : - EXPERIMENTAL : Materials - Preparation of coating samples - Coating characterization - Water absorption - Static panel exposure - Fouling evaluation - RESULTS AND DISCUSSION : The influence of aerogels on selected coating properties - Static panel exposure test - Table 1 : Silica aerogels, used for coating formulation, with varying copper pyrithione (CuPT) concentrations - Table 2 : Composition and formulation parameters of model coatings used to investigate the influence of aerogels on film properties - Table 3 : Composition and formulation parameters of coatings used for static panel exposure test - Table 4 : ECHA guidance, (a) fouling coverage is evaluated in percentage and each interval is given a rating (1–4), (b) the type of fouling is divided into four fouling categories, each fouling category is given a weighted coverage rating, (c) the overall efficacy is categorized based on calculated fouling resistanceTable 5 Viscosities of model coatings containing 2 wt% of various aerogels measured at shear rates of 0.5 and 6 s−1 DOI : https://doi.org/10.1007/s11998-022-00713-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00713-y.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39438 [article]

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