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COATINGS TECH . Vol. 15, N° 4Green coatings/sustainability issueMention de date : 04/2018 Paru le : 02/05/2018 |
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Ajouter le résultat dans votre panierNovel 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 documentProteins and peptides as replacements for traditional organic preservatives : Part I / Tyler W. Hodges in COATINGS TECH, Vol. 15, N° 4 (04/2018)
[article]
Titre : Proteins and peptides as replacements for traditional organic preservatives : Part I Type de document : texte imprimé Auteurs : Tyler W. Hodges, Auteur ; Lisa K. Kemp, Auteur ; Brittney M. McInnis, Auteur ; Kyle L. Wilhelm, Auteur ; Jonathan D. Hurt, Auteur ; Steve McDaniel, Auteur ; James W. Rawlins, Auteur Année de publication : 2018 Article en page(s) : p. 44-50 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs biosourcés
Antibactériens
Biomatériaux
Conservateurs (chimie) -- Suppression ou remplacement
Revêtements -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : The utility of a high-throughput, spectrophotometric assay in screening over 23 enzyme and peptide-based additives against bacterial coating spoilage agents was evaluated. Candidate additives were then evaluated using ASTM D2574 for in-can coating spoilage challenges, and additives that may be used to substitute for traditional biocides were identified that eliminated recoverable bacterial growth. Note de contenu : - Reagents and bacterial strains
- Measuring cell viability using XTT
- Coating challenges
- Table 1 : Bio-based additives tested in the XTT assay
- Table 2 : Bacteria used for XTT and in-can coating challenges - 3. Coating used for in-can ASTM D2574 bacterial challenges
- Fig. 1. Effects of various bio-based additives, alone and in combination, on the growth of a mixture in equal of A. faecalis, B. cereus, E. aerogenes, p. aeruginosa, p. fluorescens, and P. putida
- Fig. 2. Effects of various bio-based additives, alone and in combination with traditional chemical-based biocides, on the growth of a mixture in equal parts of A. faecalis, B. cereus, E. aerogenes, p. aeruginosa, p. fluorescens, and P. putida
- Fig. 3. Comparison of colony types present on plates from paint samples that scored 4 on day 7. Comparison of day 7 plates from the control acrylic latex samples (A) and acrylic latex + 0.05 mg/mL glucose oxidase + 2 mg/mL dextrose (B) shows that the paint with bio-based additive, though scorling 4 according to the ASTM guidelines, had at least one fewer colony type compared to the controlEn ligne : https://drive.google.com/file/d/1mlAEDD3RQVXuCMLrcz-E9cTDcX6cDyoO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30519
in COATINGS TECH > Vol. 15, N° 4 (04/2018) . - p. 44-50[article]Réservation
Réserver ce document