| Titre : |
Novel hyperbranched polyaspartic ester-soybean oil hybrid polyurethane-urea coating for high performance and anticorrosive application |
| Type de document : |
texte imprimé |
| Auteurs : |
Kumar Rajnish, Auteur ; Ramanuj Narayan, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 55-62 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Anticorrosifs
Anticorrosion
Brillance (optique)
Copolymère uréthane-urée
Esters polyaspartiques
Huile de soja
Hydroxylation
Polymères ramifiés
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Hyperbranched polymers (HBP) are the best choice for high solid and excellent performance polyurethane (PU) coatings and structural materials. Polyaspartic ester polyol based PU-ureas, which are highly unexplored, give good gloss, improved (higher) reaction time, high film build up in a single coat, better leveling and adhesion to a number of substrates with wide application area. We have synthesized a hyperbranched polyaspartic-ester polyol (HPASP) with high atom economy and solvent-free condition via A, + B,B' polycondensation in 'one pot' but two steps. The polyol was reacted with H12MD1 to form one pack high solid moisture-cured PU-urea coatings. The coating exhibited excellent mechanical, thermal, gloss and anticorrosive properties. Keeping the broader application as well as industrial viability in mind, we modified the PU coating to improve flexibility and reduce cost without compromising with the properties. For this, hydroxylated soybean oil (SO) was added to HPASP in various ratios to make PU-ureas based on H12MDI. The PU-ureas based on polyaspartic ester polyol and their SO hybrids showed better reaction control than similar HBP-polyurethanes. The hybrid polyaspartic PU-urea coating films have shown good thermal stability with high gloss transition temperature (Tg). The gloss of all the hybrid coating films was high and the mechanical properties were excellent, some even better than HPASP based PU-urea films. The anticorrosion property of all the coatings was studied using electrochemical technique (Tafel plot) and Pound to be very good. |
| Note de contenu : |
- EXPERIMENTAL : Characterization techniques - Synthesis of polyaspartic ester polyol and corresponding polyurethane-urea films -
- RESULTS AND DISCUSSION : Thermal properties - Thermo-mechanical properties - Abrasion and gloss properties - Anticorrosion properties
- SCHEMES : 1. Aspartic acid and polyaspartic-ester respectively - 2. HPASP synthesis - 3. Polyaspartic PU-urea formation
- FIGURES : 1a. TGA thermograms of various aspartic PU-urea films - 1b DTA thermograms of various aspartic PU-urea films - 2a and b. Storage modulus Vs temp and tan ? Vs temp respectively - 3. Electrochemical corrosion data (Tafel) of polyaspartic PU and SO hybrid coated mild steel
- TABLES : 1. TGA and DMTA results of polyaspartic PU-urea films - 2. Tensile, abrasion and gloss values of polyaspartic PU and SO hybrids - 3. Electrochemical corrosion data of polyaspartic PU and SO hybrid coated mild steel |
| En ligne : |
https://drive.google.com/file/d/1i3Z-Gl6Dc-GifR-071JAZD708I7aaWI4/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28871 |
in PAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 55-62
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