From hot gas stream to matt finish / Lars Leidolph in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2018) . - p. 30-35 Titre : From hot gas stream to matt finish : Thanks to novel method of spray calcination, test-ready additives for rapid market entry can be ready in just a few weeks Type de document : texte imprimé Auteurs : Lars Leidolph, Auteur ; Andreas kröger, Auteur Année de publication : 2018 Article en page(s) : p. 30-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agent mattant Dioxyde de silicium Gaz chaud Pulvérisation Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Whether it's rapid prototyping, customisation or personalisation, paint manufacturers can usually only dream of what has long been a reality in other industries. Their ideas are thwarted by minimun purchase qualities, a lack of know-how, expensive machinery or the unvailability of yet-to-be-developed powder types. Note de contenu : - The heyday of dullness - How matting arises - Challenges in matting - Particules from the pulsating hot stream - Commercially available raw materials are sufficient - What happens in the reactor ? - Market opportunities - Products sample within hours - Fig. 1 : Microscopic image of a matting agent with coating layer in 31.5: magnification (Olympus 53-BX) - Fig. 2 : Targeted adjustment of the particle size as a combination of coarse and fine matting particles, for example for dull surfaces - Fig. 3 : In the synthesis reactor, only the gas flow pulsates in a controlled manner in the specially designed combustion chamber. For particle production, fine droplets of a raw material solution are sprayed into the gas stream - they form the particles - Fig. 4 : The pulsating gas flow, in contrast to the continuous gas flow, due to the high degree of turbulence no temperature and speed gradients. Therefore all particles experience the same thermal treatment - Fig. 5 : For the chemical and mineralogical reaction, the particles are heated up extremely quickly and cooled down again. The schematic representation shows the coonversion of the injected raw material solution over the crystal-forming structures up to the calcined particle - Fig. 6 : Functionalisation of particles : matting agents can be coated with a wax component for better integration into the product matrix. The liquid coating is sprayed on and dried until the desired degree of closure of the surface or the required layer thickness is achieved - Fig. 7 : Analytical data of a thermally treated matting agent (SiO2) with a modified surface and particle size, which is very suitable for use in water-based systems. The measurement result by means of laser diffraction gives information about the suitable particle size spectrum (within the red peak) - Fig. 8 : Test and production plant ProAPP for the production of high-performance powders such as matting agents En ligne : https://drive.google.com/file/d/1O1q6XtTz3v0Pllana8hJ3yxlmenKkJDF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31217 [article]

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