| 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 |
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 3 (03/2018) . - p. 44-54
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