[article]
| Titre : |
Card phenol based benzoxazine resin and its blends with epoxy and saturated polyester for coating application |
| Type de document : |
texte imprimé |
| Auteurs : |
P. Katkar, Auteur ; I. Sancheti, Auteur ; D. S. Bhutada, Auteur ; A. Rajput, Auteur ; S. Thorat, Auteur ; S. Radhakrishnan, Auteur ; A. Sabnis, Auteur ; Prakash A. Mahanwar, Auteur ; M. B. Kulkarni, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 342-349 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Benzoxazine
Caractérisation
Cardanol
Epoxydes
Essais de brouillard salin
EthanolamineL'éthanolamine, également appelée 2-aminoéthanol ou monoéthanolamine, est un composé chimique organique qui est à la fois une amine primaire (par son groupe amine) et un alcool primaire (par son groupe hydroxyle). À l'instar des autres amines, la monoéthanolamine se comporte en base faible. L'éthanolamine est un liquide toxique, inflammable, corrosif, incolore et visqueux ; son odeur est similaire à celle de l'ammoniac.
Paraformaldéhyde
Phénols
Polybenzoxazine
Polyesters
Résistance à l'abrasion
Résistance au chocs
Résistance chimique
Réticulation (polymérisation)
Revêtements -- Propriétés mécaniques
Revêtements organiques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A free hydroxyl-containing benzoxazine monomer was synthesised using bio-based card phenol, paraformaldehyde and ethanolamine by a Mannich condensation reaction. The hydroxyl-containing benzoxazine monomer synthesised was characterised by FT-IR spectroscopy. Curing of the benzoxazine was monitored by using Differential Scanning Calorimetry (DSC). The free hydroxyl group in the benzoxazine monomer helps to enhance the adhesion of polybenzoxazine coating with the metal substrate. The synthesised benzoxazine was copolymerised with an epoxy resin and a saturated polyester resin for potential coating applications and their curing was monitored using DSC and FT-IR spectroscopy. The benzoxazine-epoxy copolymerised system demonstrated enhanced mechanical, chemical and thermal properties compared to the benzoxazine-saturated polyester system as well as compared with neat polybenzoxazine. |
| Note de contenu : |
- EXPERIMENTAL : Raw materials - Synthesis of card phenol-based benzoxazine - Blend preparation - Characterization
- RESULTS AND DISCUSSION : FT-IR analysis - DSC analysis - TGA analysis - Mechanical properties - Chemical resistance - Solvent scrub resistance - Stalt-spray test - Water absorption
- Scheme 1 : Synthesis of card phenol-based benzoxazine monomer and thermal polymerisation
- Scheme 2 : Curing reaction of hydroxyl-functional benzoxazine and epoxy resin
- Scheme 3 : Curing reaction of hydroxyl-functional benzoxazine and saturated polyester resin
- Scheme 4 : Chemical structure of unsaturated card phenol
- Table 1 : Sample compositions of BZ-EP and BZ-SPE coatings
- Table 2 : Char yield, temperature at 5% weight loss (T5%) and temperature at 10% weight loss (T10%) for polybenzoxazine and all BZ-EP and BZ-SPE compositions
- Table 3 : Mechanical properties of polybenzoxazine, BZ-EP and BZ-SPE coatings
- Table 4 : Acid and alkali resistance of polybenzoxazine, BZ-SPE coatings
- Fig. 1 : a) Polybenzoxazine, b) BZ-EP BZ 30/EP 70, c) BZ-SPE BZ 40/SPE 60 coating on mild steel panels
- Fig. 2 : FT-IR analysis of a) benzoxazine, b) saturated polyester and c) BZ-SPE BZ 40/SPE 60
- Fig. 3 : DSC thermogram of a) BZ-SPE and b) BZ-E° in temperature range of 30 to 550°C
- Fig. 4 : TGA thermograms of a) polybenzoxazine, b) saturated polyester, c) 30BZ/70EP and d) 40BZ/60SPE
- Fig. 5 : Scratch hardness and impact resistance of a) BZ-EP and b) BZ-SPE coatings
- Fig. 6 : Coating surface before and after the salt spray test in 3.5% NaCI solution for 120 hr (a) Polybenzoxazine, (b) BZ-EP and (c) BZ-SPE coatings |
| En ligne : |
https://drive.google.com/file/d/1O2NT4Z_NqEeo0vFz5t-6Bq2E9luEEgAB/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34921 |
in SURFACE COATINGS INTERNATIONAL > Vol. 103.6 (11-12/2020) . - p. 342-349
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