Preparation and stability of aqueous acrylic polyol dispersions for two-component waterborne polyurethane / Li Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 1 (01/2017) . - p. 215-223 Titre : Preparation and stability of aqueous acrylic polyol dispersions for two-component waterborne polyurethane Type de document : texte imprimé Auteurs : Li Wang, Auteur ; Fei Xu, Auteur ; Hongxin Li, Auteur ; Yangyan Liu, Auteur ; Yali Liu, Auteur Année de publication : 2017 Article en page(s) : p. 215-223 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Polyacryliques Polyols Polyuréthanes Revêtements bi-composant:Peinture bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, aqueous acrylic polyol dispersions with high stability for a two-component waterborne polyurethane were prepared. To improve the stability of acrylic dispersions, the influence of the acrylic acid (AA) addition method, neutralization, water addition rate during the dilution process, and dispersion equipment on the stability of the aqueous acrylic polyol dispersion was studied using dynamic light scattering and a thermal storage experiment. The acrylic resins’ structure was examined using Fourier transform infrared spectra, and the water resistance of the resultant films was investigated by electrochemical measurements and a water-swelling experiment. The dispersions prepared by two-step AA addition exhibited better particle size distribution, viscosity, and thermal storage compared with those prepared by one-step AA addition. Furthermore, the acrylic resin prepared by two-step AA addition was observed to possess a higher acid value. The corrosion currents of films based on dispersions prepared by two-step AA addition decreased to a smaller extent after 24 h of immersion in water. The dispersions afforded smaller particles when larger amounts of neutralizer and slower water addition rates were used. The dispersions prepared using a sawtooth disk dispersion machine displayed better performance than that prepared using a homogenizer dispersion machine. Note de contenu : - EXPERIMENTAL : Materials - Preparation of acrylic resin - Preparation of the aqueous acrylic dispersion - Preparation of coating films - CHARACTERIZATION : Fourier transform infrared (FTIR) spectroscopy - Acid value - Viscosity - dispersion size - Dispersion solid content - Zeta potential measurement - Electrochemical measurements - Water-swelling measurement RESULTS AND DISCUSSION : Effect of neutralization on stability - Effect of means of AA addition on stability - Effect of water addition rate on stability - Effect of dispersion equipment on stability - Effect of dilution En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9845-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27803 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18674	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Preparation of a superhydrophobic coating on 6061Al alloy substrate and its simplified truncated cone model / Zhexin Lv in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 933-948 Titre : Preparation of a superhydrophobic coating on 6061Al alloy substrate and its simplified truncated cone model Type de document : texte imprimé Auteurs : Zhexin Lv, Auteur ; Sirong Yu, Auteur ; Zhou Xue, Auteur ; Liu Di, Auteur ; Yangyan Liu, Auteur ; Yan Zhao, Auteur Année de publication : 2019 Article en page(s) : p. 933-948 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages Anticorrosifs Anticorrosion Hydrophobie Métaux -- Revêtements protecteurs Produits chimiques -- Suppression ou remplacement Traitement thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Superhydrophobic materials are known for their vast range of applications and properties. We present a simple process to fabricate a superhydrophobic coating on 6061Al alloy via a route with chemical replacement and heat treatment. Through this route, a hierarchical morphology including microparticles and leaf-like microstructures was obtained and, upon modification by stearic acid, the prepared coatings show good water repellency with a water contact angle of 159.2 ± 0.3° and sliding angle of 4.5 ± 1.5°. Systematic studies have been conducted on the coatings fabricated under different processing conditions to obtain the best experimental parameters, and demonstrate the reaction mechanism and the good self-cleaning effect. The 3D simulated coating topography was characterized by Leica DCM 3D in the mesoscopic scale. Based on the topography, the simplified ideal truncated cone model and theoretical equation were obtained. According to the model, a qualitative result was drawn: the higher and sharper the convex structures are, the better is the superhydrophobicity. Furthermore, the presented process can be applied to larger, stable coatings with the controllable wettability for diverse applications. Note de contenu : - EXPERIMENTAL DESIGN : Materials and reagents - Preparation for the superhydrophobic coating on 6061Al alloy substrate - Characterizations and tests - RESULTS AND DISCUSSION : The as-prepared coating with the superhydrophobicity - Optimization of experimental parameters in chemical replacement - Composition and morphology of the superhydrophobic coating - The simplified truncated cone model DOI : 10.1007/s11998-018-00168-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00168-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32851 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21127	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)