Encapsulating performance / Sandrine Sinsoulieu in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2016)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2016) . - p. 18-24 Titre : Encapsulating performance : New form of acrylic-epoxy hybrid creates high quality floor coating Type de document : texte imprimé Auteurs : Sandrine Sinsoulieu, Auteur ; Vyacheslav Starkov, Auteur ; Xavier Bricout, Auteur ; Bingquan Li, Auteur ; Jia Tang, Auteur ; Zhenwen Fu, Auteur ; Issam Lazraq, Auteur Année de publication : 2016 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Encapsulation Epoxydes Essais accélérés (technologie) Essais dynamiques Formulation (Génie chimique) Matériaux cimentaires -- Revêtements protecteurs Polyacryliques Résistance au rayonnement ultraviolet Revêtements de sols:Peinture de sols Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : In a new type of waterborne acrylic-epoxy hybrid coating, the epoxy component is initially contained within the acrylic particles but diffuses out during cure to form the continuous phase of the dry system. Advantages include fast curing, low cosolvent demand and improved UV resistance. Practical and laboratory tests of this system as a floor coating are reported. Note de contenu : - Fast drying with minimal cosolvent - UV resistance is greater than normal for epoxies - Extended pot-life and greater dilution stability - Evaluating a system for concrete car park flooring - Further lab testing evaluates AEH as a floor coating - Ease of handling combined with improved durability - FIGURES : 1. AEH and its film formation mechanism - 2. Drying rate assessed by Byk dry time recorder - 3. Gloss retention as a function of UV exposure time - 4. Schematics of multile layer flooring system - TABLES : AEH formulations for primer, mid-coat and top-coat for parking garage floor trial - 2. Coating performances based on China national (GB) standard. GB/T22374-2008 - 3. Clear formulations - 4. Pigmented coating formulas summarised - 5. Drying time and König hardness development of both clear and pigmented formulation - 6. Dry and wet adhesion temperatures and relative humidity - 6. Taber abrasion test of both pigmented and clear formulations (1000 cycles, 1kg, CS10 wheel, 200µ wetfilm thickness) En ligne : https://drive.google.com/file/d/17CPEshb_P70MRMhP0WVBaeWkWT3MyHH6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27133 [article]

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Enhancing the UV durability of epoxy coatings / Hank Bernacki in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 3 (03/2018)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 3 (03/2018) . - p. 44-54 Titre : Enhancing the UV durability of epoxy coatings : Waterborne acrylic-epoxy hybrid coatings for steel Type de document : texte imprimé Auteurs : Hank Bernacki, Auteur ; Zhenwen Fu, Auteur ; Bingquan Li, Auteur ; Denise Lindenmuth, Auteur ; Leo J. Procopio, Auteur Année de publication : 2018 Article en page(s) : p. 44-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Epoxydes Latex Métaux -- Revêtements protecteurs Métaux -- Revêtements:Métaux -- Peinture Polyacryliques Polymères -- Synthèse Revêtements bi-composant:Peinture bi-composant Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy chemistry is prevalent throughout coatings science and is utilized heavily for industrial maintenance coatings for steel and concrete. Epoxy coatings have many excellent properties, such as adhesion, corrosion resistance and hardness. However, bath solventborne epoxies and lower-VOC waterborne analogs have deficiencies such as brittleness, short potlives and must notably, pour durability towards UV light. Due to their pour weathering characteristics, epoxies tend tu chalk, yellow and lose gloss quickly when exposed to sunlight. A hybrid technology has been described that maintains the best qualities of epoxy chemistry, while im¬proving upon some of its weaknesses such as flexibility and UV durability. The hybrid technology joins acrylic and epoxy chemistries into a single waterborne offering that can then be formulated into 2K waterborne coatings for steel and concrete. The AEH represents a new method for supplying epoxy resin into a mixed 2K coating. The epoxy resin is hosted in acrylic latex particles and becomes available for cross-linking with a hardener after water begins to leave the film and particle coalescence starts. The AEH system is versatile in that either acid-functional acrylic or amine hardeners can be used. The result is a coating technology with a unique balance of properties, including long potlife, excellent corrosion resistance, good flexibility, and excellent UV durability and weatherability. Note de contenu : - Acrylic-epoxy hybrid technology - Comparison of AEH technology with solventborne epoxies - Table : Comparison of gloss white DTM finishes - Fig. 1. The formation of DGEBA from bisphenol A and epichlorohydrin - Fig. 2. The advancement of DGEBA into higher molecular weight Bis A epoxy resins - Fig. 3. Types of waterborne epoxy coatings - Fig. 4. Synthetic process for preparation of an acrylic-epoxy hybrid (AEH) polymer - Fig. 5. Detailed view of epoxy transporting into the acrylic latex particle to form the AEH polymer - Fig. 6. Possible 2K waterborne coatings based on AEH polymers - Fig. 7. Salt spray panels after 1000 hours of exposure to ASTM B117 - Fig. 8. Gloss retention on accelerated UV-1 exposure of 2K gloss white DTM coatings - Fig. 9. Gloss retention of 2K gloss white DTM coatings comparing AEH/acrylic, AEH/amine and SB epoxy/amine systems En ligne : http://www.paintsquare.com/jpcldigital/201803/index.html?page=46 Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30377 [article]

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