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On the road to a more natural finish / Tijs Nabuurs in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2018) . - p. 20-24 Titre : On the road to a more natural finish : Partially plant-based polymers evaluated in exterior and furniture coatings Type de document : texte imprimé Auteurs : Tijs Nabuurs, Auteur ; Maud Kastelijn, Auteur Année de publication : 2018 Article en page(s) : p. 20-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ameublement Applications extérieures Auto-réticulation Biomatériaux Bois -- Finition Formulation (Génie chimique) Liants Méthacrylates Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Several plant-based alternatives to fossil fuel-based (meth)acrylate monomers are described. Both exterior wood finishes and furniture finishes using binders containing 40% plant-derived carbon showed performance at least equal to that of the fossil-based control formulations. Note de contenu : - Technical background and commercial status - Plant substitution in (meth)acrylates - Itaconic acid : promising, but with some problems - Crotonic and malonic acid esteres : opposing problems - One further potential option is not yet available - Self-crosslinking exterior finishes perform well - Interior furniture coatings are also satisfactory - Higher bio-derived content should soon be possible - FIGURES : 1. General structure of monomers that can be useful in radical polymerisation - 2. Structure of D-methylene butyrolactone - TABLES : 1. Clear and pigmented formulations for exterior coatings based on self-crosslinking binders - 2. Comparison of properties of exterior wood coatings containing binders made from only fossil fuel-based monomers or from partially plant-based monomers - 3. Clear formulation for interior 2K NCD curing coatings. Properties of the crosslinked coatings are presented - 4. Film properties of 2K isocyanate crosslinking interior furniture coatings containing binders made from only fossil fuel-based monomers or partially plant-based monomers En ligne : https://drive.google.com/file/d/14oY2wFwSvW1kX2bUlCmR77KJPkIIZ3PK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30492 [article]

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A start has been made in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2018) . - p. 26-27 Titre : A start has been made Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 26-27 Langues : Anglais (eng) Catégories : Biomatériaux Fournisseurs de matières premières Matières premières Polymères Produits commerciaux Revêtements (produits chimiques) Index. décimale : 667.9 Revêtements et enduits Résumé : The number of paints and surface coatings made wit bio-based raw materials is still manageable. But it will not remain that way forever. As may be seen from the selection below, plenty of coatings raw materials already contain significant amounts of renewable raw materials. En ligne : https://drive.google.com/file/d/1M9GwNrS3x_MIL2jS1VsDDODe6qiNS8ZF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30493 [article]

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Shades of difference / Werner Rudolf Cramer in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2018) . - p. 34-39 Titre : Shades of difference : Visual and instrumental methods of colour assessment analysed Type de document : texte imprimé Auteurs : Werner Rudolf Cramer, Auteur Année de publication : 2018 Article en page(s) : p. 34-39 Langues : Anglais (eng) Catégories : Colorimétrie Evaluation visuelle Mesure -- Instruments vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : Methods of assessing colour and colour differences visually and instrumentally are discussed and compared. Preferred methods of carrying out visual colour assessment are described and explanations are offered for why visual and instrumental assessments may sometimes seem to give conflicting results. Note de contenu : - Measurement angles and correlation problems - An organised approach to visual matching - The principle of reversibility - and some exceptions - Instrumental assessment : geometrical considerations - Angle-dependent behaviour of effect pigments - Appearance of metallic and effect pigments compared - Visual and instrumental aspects summarised - Fig. 1 In this example of visual observation, the starting position at the window is + 15° for illumination and -15° for observation, i.e. the difference angle between illumination and observation is 30°C - Fig. 2. Tilting the panel up, the angle of illumination increases and the aspecular (difference angle between observation and gloss) also increases - Fig. 3. The observation angle increases when tilting the panel down. In the first steps the aspecular angle is negative, i.e. the observation angle is opposite to the gloss angle - Fig. 4. Tilting the panel further down, the aspecular angle increases. The difference angle between illumination and observation remains the same - Fig. 5. Tilting a panel up and down at a window produces the same colour travel Fig. 6. When tilting a panel by the window, the highest lightness is observed near the gloss and will decrease when the panel is tilted away from this. The same or similar values occur due to principle of the reversibility of light ; deviations reveal the orientation of the effect pigments - Fig. 7. A portable instrument illuminates at 45°. Measurement is made at -15°, +15°, 25°, 45°, 75° and 10° off gloss - Fig. 8. If coloured transparent interference pigments are applied to a white background, the colour change from the reflection to the transmission colour is shown when measuring the gloss line. The transition range is between 20° and 30° from the gloss angle - 9. Application also influences behaviour with regard to lightness. The same coating was applied with and without an additional effect layer. Close to the gloss, the effect layer produces a brighter shade - 10. Tilting a sample panel at the window or in a light cabin shows the same colour gradient for both tilting down and tilting up. The colour gradient that current portable devices describe corresponds to the gradient when the gloss angle is changed. In all cases, different colour gradients arise from those of the interference En ligne : https://drive.google.com/file/d/1TQwGB5nfx6DUSG2me8WmaEWhw62SxsnE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30494 [article]

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Laser focus on curing / Christian Schmitz in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2018) . - p. 40-44 Titre : Laser focus on curing : Improving energy efficiency and optimising film formation in powder coatings Type de document : texte imprimé Auteurs : Christian Schmitz, Auteur ; Bernd Strehmel, Auteur Année de publication : 2018 Article en page(s) : p. 40-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Formation de film Lasers -- Applications industrielles Polyesters insaturés Les résines de polyesters insaturés (UP) sont obtenues par polycondensation d’un ou de plusieurs diacides avec un ou plusieurs glycols, l’un, au moins, des constituants contenant une double liaison éthylénique susceptible de réagir ultérieurement sur un composé vinylique, acrylique ou allylique. Par le terme résine polyester, on désigne en fait la dissolution du prépolymère polyester insaturé dans un solvant copolymérisable, le plus utilisé étant le styrène. C’est sous cette forme liquide que les résines polyesters sont livrées aux transformateurs. Après addition de différents adjuvants, charges et renforts, divers procédés de transformation provoquent, sous l’action d’un système catalytique approprié, la copolymérisation finale de la résine en un objet thermodurcissable. Les polyesters insaturés sont d’un usage relativement ancien (1950), essentiellement dans le bâtiment (moulage au contact). Ils ont connu un renouveau important à partir de 1980, en particulier au niveau des formulations et de la fiabilité des procédés grâce au développement de technologies industrielles de moulage par injection et par compression dans l’industrie automobile. Polymérisation Prévision, Théorie de la Revêtement -- Séchage Revêtements poudre Vinyl éther uréthane Index. décimale : 667.9 Revêtements et enduits Résumé : Laser technology is a common tool for material processing. Moreover, thermally induced coating processes such as curing benefit from th euse of laser as it speeds up thermal processes that require high object temperatures. Radiation-curable powder coatings are one example of where laser application can make a difference by optimising curing and film formation. Note de contenu : - Line-focused laser beam to dry coatings - Interaction betweenlight and matter - Polymerisation cannot be monitored in isolation - Optimising the energy input for film formation - Energy input and polymer state are key for network density - Fig. 1. Intensity distribution and beam profil of the line-focused laser for homogeneous exposure of the surface - Fig. 2. Mechanism of heat and radical generation, a) electron transfer reaction with the diaryl iodonium cation and subsequent cleavage into aryl radicals, b) deactivation by internal conversion - Fig. 3. Demonstration of absorber excitation a) by laser light) b) photophysical deactivation via fluorescence, and c) internal conversion competing with the chemical reaction - Fig. 4. Laser-induced film formation of NIR-curable powder coatings (unsaturated polyester/vinylether urethane) with the NIR-initiator system (novel NIR 1 [0.06 wt%]/novel NIR 2 [0.06 wt%]/diaryl iodonium [2.0 wt%]) at 808 nm and 980 nm (each 60 W) and the optimum of the laser focus ; a) and b) without pigment ; c) to e) with Fe2O-pigment - Fig. 5. Conversion of the laser-induced thermal polymerisation of powder coatings (vinylether urethane) with NIR 2 and di-tert-butyl peroxide as raidcal generators after exposure with NIR laser spot (980 nm) and scanning speed of 4 mm.s-1 En ligne : https://drive.google.com/file/d/1yZzyPBsVUrNnuMMzlQfcsAdEKoKN5z9i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30495 [article]

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Sealed against staining / Udo Goedecke in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2018) . - p. 46-50 Titre : Sealed against staining : Hybrid polymer provides reliable protection for cementitious flooring Type de document : texte imprimé Auteurs : Udo Goedecke, Auteur ; Udo Anders, Auteur Année de publication : 2018 Article en page(s) : p. 46-50 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Essais (technologie) Formulation (Génie chimique) Liants Matériaux -- Imprégnation Matériaux cimentaires Polyéther de silicone Résistance aux taches Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : A novel silane-terminated binder can provide cement-bound floors with highly effective protection from stains. The binder can be readily applied as a one-component impregnation system. Its performance has been verified in practical tests. Note de contenu : - New binder offers past, effective impregnation - Safe and simple to formulate and process - Application and curing parameters - Stain resistance is excellent - Surface colour is enhanced by clear coats - Practical value confirmed in an industrial plant - Project preparation and implementation - Efficient floor protection, with wide application - Table : Solvent-free reference formulation for transparent concrete impregnation - Fig. 1. Structure of an α-dimethoxysilane-terminated polyether. The two silane termini are each bound to a polyether backbone via a methylene group and a urethane unit - Fig. 2. Stain test : twenty substances were tested, including salt water, red wine, cola, mustard, ketchup and used oil - Fig. 3. Results of the comparison test on cementitious test plates. Only three stains cannot be removed from th eplate impregnated with the alpha-silane system - Fig. 4. The impregnation noticeably intensifies colour - Fig. 5. The material removed by abrasion from concrete test plates fell from 40 grams to 3 grams - Fig. 6. The diluted impregnation agent was applied to the sanded-down concrete floor of a production hall at the Agricolae Kft. fruit preserves plant in Jànkmajtis, Hungary - Fig. 7. Production hall at the Agricolae Kft plant following a second coat of the impregnation agent. The surface is now uniformly glossy En ligne : https://drive.google.com/file/d/1AwdbCKcuC_riajtgCezKAT2MPilIzoz6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30498 [article]

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