Novel cashew nutshell liquid-based waterborne curing agents designed for high-performance and low-VOC protective epoxy coatings / Hong Xu in COATINGS TECH, Vol. 17, N° 5 (05/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 5 (05/2020) . - p. 18-27 Titre : Novel cashew nutshell liquid-based waterborne curing agents designed for high-performance and low-VOC protective epoxy coatings Type de document : texte imprimé Auteurs : Hong Xu, Auteur ; Joe Mauck, Auteur ; Fernanda Tavares, Auteur ; Anbu Natesh, Auteur ; Jing Li, Auteur Année de publication : 2020 Article en page(s) : p. 18-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Essais de brouillard salin Formulation (Génie chimique) Noix de cajou et constituants Primaire (revêtement) Réticulants Réticulants en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of zero-volatile organic compound (VOC) waterborne epoxy curing agents based on cardanol, a non-food chain and renewable biomaterial, has been developed to meet stricter regulation, as well as high-performance requirements. This article presents the latest performance studies of applying those new Cashew Nutshell Liquid-based waterborne curing agents in typical formulations for heavy duty, industrial, and transportation coatings applications. Test results revealed that the novel waterborne curing agents enable the formulations of low-VOC (< 75 g/L) direct-to-metal primer systems with excellent performance, such as balanced fast cure and long pot life, superior adhesion, and long-term corrosion protection of numerous metal substrates. Furthermore, the influence of various solid epoxy dispersions, different cure processes, and co-solvents upon film formation, adhesion, and anti-corrosion performance are reviewed, and the challenges of improving long-term corrosion protection of waterborne primer systems over galvanized steel substrates are discussed. Note de contenu : - Part 1 : Improved application properties from new waterborne curing agents - Part 2 : Waterborne primer/mid-coat systems based on new WB-A and WB-B curing agents - Part 3 : Wet-on-wet properties - Part 4 : Formulation study - Fig. 1 : Cashew apple and nutshell - Fig. 2 : Average cardanol structure - Fig. 3 : Viscosity changes of waterborne curing agents as function of the percentage of added water - Fig. 4 : Diluation properties of WB-A with various solid epoxy dispersions - Fig. 5 : Linear dry time data ov various waterborne systems - Fig. 6 : Persoz hardness development of various waterborne systems - Fig. 7 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1162 h, 949 h of salt-spray exposure, respectively (SA 2.5 steel substrate, bake cure, DFT = 60-75 µm) - Fig. 8 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1162 h, 949 h and 1162 of salt-spray exposure, respectively (S-36 CRS substrate, bake cure, DFT = 75 µm) - Fig. 9 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 2018 h, 1852, and 2018 h of salt-spray exposure, respectively (AA 2024 T3 substrate, bake cure, DFT = 65 µm) - Fig. 10 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 996 h, 949 h of salt-spray exposure, respectively (stainless steel substrate, RT cure, DFT = 65 µm) - Fig. 11 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1115 h, 949 h of salt-spray exposure, respectively (galvanized steel substrate, RT cure, DFT = 65 µm) - Fig. 13 : Photo images of the wet-on-wet application panels after 881 h of salt-spray exposure - Fig. 14 : Panel images of MC#4 system, MC#5 system and MC#5 system after 750 h of salt-spray exposure (galvanized steel substrate, RT cure, DFT = 50-60 µm) - Fig. 15 : Panel images of MC#4 system, MC#5 system and MC#7 system after 750 h of salt-spray exposure (galvanized steel substrate, RT cure, DFT = 50-60 µm) - Fig. 16 : Panel images of five waterborne primer systems containing different co-solvents after a 20-h RT aging - Table 1 : Waterborne curing agents - Typical properties - Table 2 : Typical properties of solid epoxy dispersion resins - Table 3 : Waterborne primer formulations based on WB-A, WB-B, and COM - Table 4 : Dry and wet adhesion of WB-1, WB-B, and COM system over various metal substrates - Table 5 : Waterborne primer formulations based on WB-A - Table 6 : Gloss retention of the test panels after wet-on-wet application - Table 7 : Property tests using different solvents En ligne : https://drive.google.com/file/d/1XacND7z3Wh6j3ngkyWrPxrafLk0n_1E-/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34303 [article]

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