| Titre : |
Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane |
| Type de document : |
texte imprimé |
| Auteurs : |
Yingyu Li, Auteur ; Jingwei He, Auteur ; Hongfeng Luo, Auteur ; Xiaoling He, Auteur ; Fang Liu, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 1621-1633 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Dépôt électrophorétique
Polymères -- Synthèse
Polymères en émulsion
Polyuréthanes
Revêtement autoréparant
Revêtements -- Propriétés thermiques
Revêtements en phase aqueuse
Revêtements organiques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Cathodic electrophoretic deposition (CED) coatings are inevitably scratched following their application in processes such as automotive finishing. Self-healing coatings possess the ability to repair micro-scale damage, thereby extending their service life and reducing maintenance costs. Here, a novel strategy was developed to synthesize room-temperature intrinsic self-healing CED coatings by inserting 2-aminophenyl disulfide (APDS) into the polymer chain of cationic waterborne polyurethane (CWPU). Emulsion films incorporating the disulfide (SCWPU) could self-heal at room temperature via dynamic disulfide bond exchange and hydrogen bonding interactions, and their structures were confirmed by FTIR and Raman spectroscopy. The thermal properties of the SCWPU films were determined by differential scanning calorimetry and thermal gravimetric analysis. The effects of APDS incorporation and hard segment content (HSC) on the self-healing ability, mechanical and emulsion properties of the SCWPU films were systematically investigated. The results showed that the self-healing abilities of SCWPU film were 97.2% at RT over 24 h and 96.5% at 37°C (body temperature) after 4 h. CED coatings (8 μm, 3H pencil hardness) prepared from SCWPU emulsion also displayed self-healing properties at room temperature. |
| Note de contenu : |
- EXPERIMENTAL SECTION : Materials - Synthesis of cationic waterborne polyurethanes with disulfide bond (SCWPU) - Preparation of SCWPU films - Characterization of SCWPU - Self-healing performance - Preparation of films of cathodic electrodeposition (CED) coatings
- RESULTS AND DISCUSSION : FTIR and Raman spectra analysis - Thermal properties - Self-healing properties - Properties of the waterborne CED coatings
- Table 1 : Composition of Sxa-CWPU samples (mol ratio)
- Table 2 : Composition of SCWPU/HSCa samples (mol ratio)
- Table 3 : Properties of the CED film coatings and SCWPU emulsions |
| DOI : |
https://doi.org/10.1007/s11998-022-00634-w |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-022-00634-w.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38294 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1621-1633
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