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Multifunctional superwetting agent for coating applications / Vimal Saini in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4657 (12/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4657 (12/2019) . - p. 15-20 Titre : Multifunctional superwetting agent for coating applications Type de document : texte imprimé Auteurs : Vimal Saini, Auteur ; Wolfgang Fuchs, Auteur ; Elke Piron, Auteur ; Carlos Feito, Auteur ; Udo Schonhoff, Auteur ; Frank Abschlag, Auteur Année de publication : 2019 Article en page(s) : p. 15-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents mouillants Angle de contact Formulation (Génie chimique) Polyacryliques Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : Wetting agents are added to waterborne coatings in order to increase the wetting of the substrate and to improve the compatibility with pigments and other components. Selection of the suitable wetting agent for desired formulation and application properties is critical. For example, anionic wetting agents can have excellent dynamic surface tension control but can often result in an increase in the foaminess of the grind that may appear as microfoam in the applied coating. Low foaming nonionic wetting agents have found value in industrial coatings, where microfoam cannot be tolerated however, they do not provide adequate surface tension control. To overcome these limitations, a new low foaming, silicon and APEO free multifunctional wetting agent has been developed (SUPREAD® 2059). It provides antifoaming properties, as well as offering fast dynamic surface tension reduction for improved flow and levelling on difficult to wet surfaces like wood, plastics etc. The newly developed multifunctional wetting agent was tested in various coating formulations. The results of the study reveals its outstanding ability in surface wetting, antifoaming, pore filling on wood, block resistance and has shown no negative impact on gloss or rheology. Note de contenu : - BASICS OF WETTING - CHALLENGES IN WATERBORNE COATINGS : Sample examined - Surface tension - Contact angle - Foaming behaviour - EVALUATION IN CLEAR COAT BASED ON ACRYLIC DISPERSION - EVALUATION IN WHITE WOOD COATING BASED ON SELF6CROSSLINKING ACRYLIC DISPERSION : Improved surface wetting - Block resistance - Pore filing ability - Overall performance comparison - Substrate wettability in OPV ink and adhesive system - Fig. 1 : Illustration of contact angles formed by sessile liquid drops on a smooth homogeneous surface - Fig. 2 : Static surface tension comparison of aqueous solutions containing 0.3wt% wetting agent - Fig. 3 : Evolution of advancing contact angle with 0.3% aqueous solutions of wetting agents a) in glass substrate and b) on untreated polypropylene plastic - Fig. 4 : Foaming behaviour with the Skandex shaker - Fig. 5 : Rheograms of the clear coat - Fig. 6 : Brush applied clear coat on Lenata chart - Fig. 7 : Wetting performance in white wood coating based on self-crosslinking acrylic dispersion Brush applied clear coat on Lenata chart - Fig. 8 : Improved block resistance with Supread® 2059 - Fig. 9 : Pore filling ability via spray application (Scale in all samples -1mm (only except Reference 3-3mm) - Fig. 10 : Surface wettability comparison with 0.3% Supread® 2059 al In OPV system on PVC wallpaper bl BOPP film - Table 1 : Samples examined - Table 2 : Application properties of clear coat based with different wetting agents - Table 3 : Overall application performance comparison - Table 4 : Transparent clear coat based on acrylic dispersion - Table 5 : Based on self-crosslinking acrylic dispersion - Table 6 : White window paint test formulation En ligne : https://drive.google.com/file/d/16NX56HuRVYQUKgsuozi6IysnzQju6B6v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33395 [article]

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Impact of extenders in TiO2 reduction and curing efficiency in UV cured flexo ink / Amandine Briand in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4657 (12/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4657 (12/2019) . - p. 24-28 Titre : Impact of extenders in TiO2 reduction and curing efficiency in UV cured flexo ink Type de document : texte imprimé Auteurs : Amandine Briand, Auteur ; Anabelle Elton-Legrix, Auteur ; Andrew Curtis, Auteur ; Janet S. Preston, Auteur Année de publication : 2019 Article en page(s) : p. 24-28 Langues : Anglais (eng) Catégories : Brillance (optique) Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Dioxyde de titane Encre -- Séchage sous rayonnement ultraviolet Encre flexographique Extendeurs Formulation (Génie chimique) Kaolin Réflectance Talc Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The use of ultraviolet light to cure inks in the packaging printing industry has become increasingly common since it has been first developed. lndeed, the need for more visual appeal in packaging, with quicker curing rates and lower waste, has been one of the drivers behind this growth. TiO2 is the most commonly used pigment in white UV cured flexo ink due to its high refractive index providing high opacity even at thin film thickness. Unfortunately, absorbs a portion of the UV spectrum and has a detrimental effect on the curing of the ink. In addition, a high loading of TiO2 can be detrimental to the optical performance due to crowding of particles. This paper reports how calcium carbonate, kaolin and talc can partially substitute TiO2 in UV-cured flexo inks, whilst still maintaining a high gloss and suitable opacity. In addition, the impact of extenders on the curing efficiency has been evaluated. Note de contenu : - Experimental/methodology - Results - Curing properties of the inks - Results - TiO2 reduction - Impact on optical properties - Table 1 : UV flexo white ink formulation - Fig. 1 : Photos of an UV ink cured after five passes - Fig. 2 : Example of FT-IR of an uncured vs cured ink - Fig. 3 : Comparison of peak reduction with different extender vs TiO2 - Fig. 4 : Reflectance of different minerais in the UV spectral range - Fig. 5 : Percentage peak reduction at high and low loading of photoinitiator with Ti02 and fine GCC - Fig. 6 : Viscosity at 10s-1 of the inks at 5% TiO2 reduction - Fig. 7 : Measured reflectance vs g/m2 - Fig. 8 : Calculated reflectance at 14.5g/m2 (left) and 4.5g/112 - Fig. 9 : Calculated reflectance at 14.5g/ m2at 10% TiO2 reduction - Fig. 10 : Ti02 scattering and crowding effect on opacity - Fig. 11 : Film thickness needed to achieve a reflectance of 40 with extenders - Fig. 12 : Calculated gloss at 14.5g/m2at 5% Ti02 reduction En ligne : https://drive.google.com/file/d/1uCu9AZMdWYFon_xtrBTPO5nE4kC_aGKj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33396 [article]

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Effects of screw geometry on the production of powder coatings / Jon Lea in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4657 (12/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4657 (12/2019) . - p. 36-38 Titre : Effects of screw geometry on the production of powder coatings Type de document : texte imprimé Auteurs : Jon Lea, Auteur Année de publication : 2019 Article en page(s) : p. 36-38 Langues : Anglais (eng) Catégories : Extrudeuses Revêtements poudre Vis d'extrusion Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses the evolution of extruder machines and the critical parameters necessary for the efficient production of powder coating. Note de contenu : - Available extruder torque - Machine power conclusions - Powder coatings power limit : Geometry options and background - Kneading - Clearances - Shear rate - Intake En ligne : https://drive.google.com/file/d/15uSt4qGI7NdHypCX_guFRMnMTpA4BMMM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33397 [article]

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Polymer Paint Colour Journal (PPCJ) Vol. 209, N° 4657 URL