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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]
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 aqueuseIndex. 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 solventsEn ligne : https://drive.google.com/file/d/1XacND7z3Wh6j3ngkyWrPxrafLk0n_1E-/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34303
in COATINGS TECH > Vol. 17, N° 5 (05/2020) . - p. 18-27[article]Réservation
Réserver ce documentNovel CNSL-based waterborne Zn-rich primer systems for protective coatings / Hong Xu in COATINGS TECH, Vol. 15, N° 4 (04/2018)
[article]
Titre : Novel CNSL-based waterborne Zn-rich primer systems for protective coatings Type de document : texte imprimé Auteurs : Hong Xu, Auteur ; Fernanda Tavares, Auteur ; Anbu Natesh, Auteur ; Jing Li, Auteur Année de publication : 2018 Article en page(s) : p. 34-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Application directe sur le métal
Brillance (optique)
Cardanol
Epoxydes
Essais d'adhésion
Essais de brouillard salin
Formulation (Génie chimique)
Métaux -- Revêtements protecteurs
Noix de cajou et constituants
Phénalkamines
Polyuréthanes
Primaire (revêtement)
Réticulants
Revêtements -- Finition
Revêtements -- Propriétés mécaniques
Revêtements bi-composant
Revêtements en phase aqueuse
Rhéologie
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : Low-VOC waterborne (WB) Zn-rich primers and high performance WB epoxy primers have been developed based on novel Cashew Nutshell Liquid (CNSL)-derived curing agents for industrial and protective coating applications. These unique WB phenalkamines were synthesized from a natural, non food chain and renewable biomaterial and could help formulate WB primer systems that meet stricter volatile organic compound (VOC) regulations as well as high performance requirerments.
This article presents the latest performance studies of new phenalkamine-based WB Zn-rich primers and epoxy primers, and discusses the challenges associated with such formulations.
New 2K WB Zn-rich primers were formulated with a water-free phenalkamine curing agent. The study results showed the WB Zn-rich primers had good compatibility with various commercially available solid epoxy dispersions and delivered good cure and mechanical properties ; importantly, those WB Zn-rich primers provided superb adhesion to both metal substrates and commercial polyurethane (PU) topcoats without the use of adhesion promoters. Excellent corrosion protection and good resistance to undercutting of the scribe were observed after 3000-h Q-Fog exposure.
Additionally, newly developed WB high performance primers based on zero-VOC WB phenalkamines were evaluated either in combination with WB Zn-rich primers or by being directly applied over metal substrates was found that those WB epoxy primers could enhance corrosion protection as mid-coats to WB Zn-rich primers ; when being used direct-to-metal, WB epoxy primers also exhibited good mechanical and adhesion properties that benefited the overall anticorrosion performances.Note de contenu : - Part I : Waterborne (WB) Zn-rich primer study
- Part II : Waterborne (WB) mid-coat systems based on new WB-C curing agent
- Part III : Wet-on-wet properties
- FIGURES : 1. Cashew apple and nutshell - 2. Average cardanol structure - 3. Example of phenalkamine structure - 4. Panel images of cross-hatch adhesion tests - 5. Panel images after 120h salt spray exposure - 6. Panel images after 4000-h salt spray exposure - 7. Panel images after 1200-h salt spray exposure - 8. Panel images after 2400-h salt spray exposure (surface rusts were removed via scratch pad) - 9. Panel images after 2300-h salt spray exposure (WB Zn-rich primer systems topcoated with a red iron oxide mid-coat) - 10. Panel images after scribe and wet adhesion testing - 11. Mixing viscosity changes as a function of the percentage of added water - 12. Linear dry time of various systems based on WB-C - 13. Panel images of resin 1+WB-C clear coating-system after 1200-h salt spray exposure - 14. Panel images of MC#1 and MC#2 systems after 271 and 767-h salt spray exposure - 15. Panel image of WB Zn-rich#4 primer system topcoated with MC#2 mid-coat primer after 1685-h salt spray exposure - 16. Photo images of the panels after wet-on-wet adhesion tests
- TABLES : 1. Waterborne curing agents : typical properties - 2. Typical properties of solid epoxy dispersion resins - 3. WB Zn-rich primer formulations by using WB-A curing agent - 4. Mechanical properties of WB Zn-Rich primers - 5. WB mid-coat formulations based on WB-C - 6. Adhesion and anticorrosion performances of MC#2 systems as a function of mixing times - 7. Mechanical and adhesion properties of MC#2 - 8. Gloss comparisonEn ligne : https://drive.google.com/file/d/1QsQ8l4uOx13cFvlKXZElv8uh5js2daAr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30518
in COATINGS TECH > Vol. 15, N° 4 (04/2018) . - p. 34-42[article]Réservation
Réserver ce documentPhenalkamide - new hybrid molecule and its unique coating properties / Yun mi Kim in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4586 (07/2013)
[article]
Titre : Phenalkamide - new hybrid molecule and its unique coating properties Type de document : texte imprimé Auteurs : Yun mi Kim, Auteur ; Fernanda Tavares, Auteur ; Donald Lawson, Auteur ; Mengjiu Chen, Auteur Année de publication : 2013 Article en page(s) : p. 25-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Epoxydes
Formulation (Génie chimique)
Marines (peinture)
Métaux -- Revêtements protecteurs
Phénalkamides
Réticulants
Revêtements antisalissures:Peinture antisalissuresIndex. décimale : 667.9 Revêtements et enduits Résumé : Performance of phenalkamides with other commercial curing agents. Note de contenu : - Table 1. Curing agents
- Table 2. Pigmented epoxy base formulation
- Table 3. Linear dry time @ 5°C(5mil DFT, liquid epoxy resin, EEW190)
- Table 4. Persoz hardness and humidity appearance (7mil DFT, liquid epoxy resin, EEW 190)En ligne : https://drive.google.com/file/d/15Kdf0j5WTgZ7PqKRizr-Zm5NUlBPoA1j/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19206
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 203, N° 4586 (07/2013) . - p. 25-27[article]Réservation
Réserver ce documentRenewable technology for high performance epoxy coatings / Donald Lawson in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4609 (06/2015)
[article]
Titre : Renewable technology for high performance epoxy coatings Type de document : texte imprimé Auteurs : Donald Lawson, Auteur ; Hong Xu, Auteur ; Guo Ming, Auteur ; Mengjiu Chen, Auteur ; Fernanda Tavares, Auteur Année de publication : 2015 Article en page(s) : p. 28-30 Langues : Anglais (eng) Catégories : Anticorrosion
Couleurs -- Stabilité
Epoxydes
Matériaux cimentaires -- Revêtements protecteurs
Phénalkamides
Réticulants
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Phenalkamides are a novel class of curing agents for two-component, ambient cure epoxy coatings and adhesives. Phenalkamides combine the benefits of polyamides and phenalkamines in one product, while mitigating their limitations. Epoxy coatings based on phenalkamides have the outstanding corrosion protection and fast low temperature cure of phenalkamines, with the good colour stability, long overcoat window and high flexibility of polyamides. This combination of properties enables the use of one workhorse-curing agent year round in multiple protective coatings and structural adhesives applications. ln addition to their excellent performance, phenalkamides are made from Cashew Nutshell Liquid (CNSL), a non-food chain, renewable-oil extracted from the honeycomb structure of the cashew nut. CNSL based products have been widely and successfully used in the coatings industry for over 25 years. Note de contenu : - PHENALKAMIDE PRODUCT LINE : Cure times - Film appearance - Corrosion protection - Colour stability - Overcoatability - Concrete applications En ligne : https://drive.google.com/file/d/1c6sDFiDMQJkitsOvsEyecxi7_YzwyjXE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24279
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 205, N° 4609 (06/2015) . - p. 28-30[article]Réservation
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