Finding the white balance / Thomas R. Hanna in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2014)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2014) . - p. 32-37 Titre : Finding the white balance : Factors affecting TiO2 efficiency and how to measure them Type de document : texte imprimé Auteurs : Thomas R. Hanna, Auteur ; Johan J. Rommens, Auteur Année de publication : 2014 Article en page(s) : p. 32-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de titane Lumière -- Diffusion Revêtements:Peinture Tests d'efficacité Index. décimale : 667.9 Revêtements et enduits Résumé : The factors affecting TiO2 efficiency in different paints are discussed, as are methods of measuring this efficiency. Evaluations of scattering in various commercial paints show that many are formulated with scattering efficiencies well below the maximum, indicating scope for reformulation. Note de contenu : - Factors affecting light scattering by TiO2 - Comparing scattering efficiency in paints - Measurements of TiO2 scattering can be complex - How scattering contributions are measured - TiO2 scattering is measured indirectly - Making corrections for gloss differences - Wide differences in TiO2 efficiency found in paints - Efficiency evaluations aid in reformulating paints En ligne : https://drive.google.com/file/d/1DmiU21dX414N92k77xGrHY30cfu_bXCF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22068 [article]

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Keeping on the white track / Johan J. Rommens in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2015)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 3 (03/2015) . - p. 88-92 Titre : Keeping on the white track : Optimising the efficiency of titanium dioxide in architectural paints Type de document : texte imprimé Auteurs : Johan J. Rommens, Auteur ; Steven de Backer, Auteur Année de publication : 2015 Article en page(s) : p. 88-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de titane Lumière -- Diffusion Opacifiants Pigments inorganiques Réflectance Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.2 Colorants et pigments Résumé : Optimisation of the scattering efficiency of titanium dioxide can produce considerable cost savings. Ways to measure the efficiency of use of TiO, and to improve it are described. What is referred to as 'highly treated' TiO, can further improve opacity. This in turn can result in lower paint consumption, minimising environ-mental impacts. One of the main functions of architectural paint is to hide a surface and improve its appearance. Hiding can be obtained either by scattering visible light or by absorbing it. For white paints, absorption is minimised, so that hiding in thin paint films can only be obtained by light scattering. Because of its high refractive index (RI), titanium dioxide (Ti02) is the most efficient pigment for scattering visible light and its lack of absorption in the visible light range makes it the best white pigment available. Since light scattering is the key parameter controlling hiding in white pain) or whitening strength in tinted paints, more efficient use of Ti02 can lead to improved hiding. This can reduce the number of paint layers needed for full coverage and hence speed up painting. Fewer paint layers saves costs and raw materials and hence reduces the environmental impact of the paint. This paper describes how Ti02 efficiency can be assessed and how that knowledge can be used to prioritise hiding optimisation programmes. Note de contenu : - Factors influencing hiding power in paints - Determining the light scattering of paint - Factors that limit pigment efficiency - How pigment spacing affects opacity - A pigment designed to maximise efficiency - Optimising formulations for opacity En ligne : https://drive.google.com/file/d/16RNQNfPO8i6tRMWroDEbaGDdopqwefmD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23475 [article]

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The lasting impact of titanium dioxide / Johan J. Rommens in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2020)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2020) . - p. 30-36 Titre : The lasting impact of titanium dioxide : A better understanding of how TiO2 affects powder-coat weathering Type de document : texte imprimé Auteurs : Johan J. Rommens, Auteur ; Steven de Backer, Auteur ; P. Gijsman, Auteur ; Leendert Molhoek, Auteur Année de publication : 2020 Article en page(s) : p. 30-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique) Dioxyde de titane Essais accélérés (technologie) Polyesters Résistance aux conditions climatiques Revêtements -- Détérioration:Peinture -- Détérioration Revêtements organiques Revêtements poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Choosing the right method to evaluate weathering is important for the development of durable, high-quality coatings. Accelerated test methods often lead to the wrong conclusions. Note de contenu : - Titanium dioxide for durability - Weathering tests indispensable - Accelerated measurement of weathering resistance in paints - Pathways to degradation - Outdoors is best - Accelerated is risky - Experimental - Influence of TiO2 on weathering resistance - Comparison of accelerated weathering methods - Don't jump to conclusions - Understanding photo-degradation - It's wetter in Florida - More photolysis in Florida - Rate of degradation initiation is key - Table 1 : Weathering requirements according to GSB - Fig. 1 : Gloss retention of powder coat after 1000 h Q-UVB exposure - Fig. 2 : Gloss retention of powder coat after 1000 h WOM (xenon) exposure - Fig. 3 : Gloss retention of powder coat after 5 years' Florida exposure - Fig. 4a : Correlation between QUV-B exposure and Florida exposure (GSB "standard class"). GR = Gloss retention - Fig. 4b : Scatterplot of QUV GR 600 hours vs Florida GR three years - Fig. 5a : Correlation between WOM and Florida testing (class 1 qualicoat) - Fig. 5b : Scatterplot of xenon GR 1000 hours vs Florida GR three years - Fig. 6 : Measured (points) and calculated (lines loss of gloss as a function of time in TiO2-pigmented, Primie-445 crosslinked polyester powder coatings of variable isophthalic-terephthalic ester rations and weathered according to ASTM D7869, ISO 11341, ASTM G-53 and Florida - Fig. 7 : Weight loss (wt. %) under lab conditions of water-saturated coatings 1 and H (6h at 40°C in liquid water) - Fig. 8 : Measured and calculated of loss og gloss over time in Florida of a Primid XL552-crosslinked polyester powder coating (P800) containing different TiO2 types (calculated lines for C2, C3 and C10 as well as for C1 ; C7 and C6 overlap) - Fig. 9 : k1 values calculated for the different TiO2 types, relative to the value of coatings made with C7 En ligne : https://drive.google.com/file/d/1FyeVmJ63vHPjeZjkEtUOgZD2OdgjSd_c/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33920 [article]

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