Uncovering a critical missing piece of the coatings durability equation / Mike Diebold in COATINGS TECH, Vol. 20, N° 4 (07-08/2023)  

[article]  inCOATINGS TECH > Vol. 20, N° 4 (07-08/2023) . - p. 36-41 Titre : Uncovering a critical missing piece of the coatings durability equation : How formulators can maximize paint durability by better understanding the effects of TiO2 dispersion and photoactivity Type de document : document électronique Auteurs : Mike Diebold, Auteur ; Grant C. Breier, Auteur Année de publication : 2023 Article en page(s) : p. 36-41 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Dispersions et suspensions Durée de vie (Ingénierie) Formulation (Génie chimique) Index. décimale : 667.9 Revêtements et enduits Résumé : Maximizing a coating's durability is a complex equation that must account for multiple factors. Making matters even more challenging is the fact that formulators have been missing a critical piece of information about how titanium dioxide (TiO2) can influence durability-until now. Today’s paint producers and formulators are under heightened pressure to create highly durable coatings for exterior architectural and industrial applications capable of standing up against harsh UV rays, rising temperatures, and severe weather events. At the same time, many applications also demand greater efficiency via longer-lasting coatings that increase the length of service before recoating and reduce material and labor costs. TiO2, a critical component of high-quality, highly protective coatings, is known to have several effects on paint durability that formulators must consider. As a strong UV light absorber, TiO2 protects underlying resin from direct interactions with the UV component of sunlight. however, TiO2 can convert some of the UV light energy into chemical energy in the form of radicals, which can then attack the binder or react with other molecules at the surface that can lead to further paint degradation. In addition to the inherent photoactivity of the TiO2 pigment, the degree of TiO2 dispersion also plays an important role in determining a paint’s durability. It is logical for formulators to assume that by decreasing the photoactivity they can create a more durable coating. However, a more nuanced approach shows that TiO2 grade can affect paint durability beyond simple TiO2 photoactivity. Note de contenu : - Closing a crucial information gap - Unexpected results - Arming formulators with value-adding information - Table 1 : Standard architectural paint formula En ligne : https://drive.google.com/file/d/1KsFcRlOn9RPre5Gt8ZsIw2HpkaiTVf45/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39848 [article]

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