[article]
| Titre : |
Novel heat resistant aqueous dispersions containing phthalazinone |
| Type de document : |
texte imprimé |
| Auteurs : |
Z. Y. Liu, Auteur ; J. Y. Wang, Auteur ; Q. L. Yan, Auteur ; Y. Kou, Auteur ; X. G. Jian, Auteur |
| Année de publication : |
2007 |
| Article en page(s) : |
p. 89-100 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Dispersions et suspensions
Hydrophilie
Polyphthalazinone éther nitrile cétones
Revêtements en phase aqueuse:Peinture en phase aqueuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Poly(phthalazinone ether nitrile ketone)s (PPENK) modified with NaOH was studied in order to find a hydrophilic resin applied in heat-resistant waterborne coatings. The properties ofhydrolyzates, HPPENKa (0.5 h), HPPENKb (1.5 h) and HPPENKc (3.5 h), were measured by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle (water) and solubility. The structures ofhydrolyzates were confirmed by FT IR and 1H-NMR. The results indicated that the nitrile groups conversion ratio and Ts of hydrolyzates increased whereas the weight loss ratio of HPPENK decreased as hydrolysis time was prolonged. As expected, the hydrophilicity of HPPENK was improved greatly, e.g. when CN conversion ratio was 93.82%, the water contact angles was decreased from 75. 3° of PPENK to 54. 4° of HPPENK. By studying the effect of the different reaction co-solvents, reaction temperature and NaOH concentration on hydrolysis, the optimal synthetic technology could be concluded that it is of 6 N NaOH solution and DMAc as cosolvent at 120°C. Aqueous dispersions based on three modified resins were prepared and their storable stability was in the following order: HPPENKc >HPPENKb >HPPENKa. Especially, the HPPENKc dispersion was not found deposition more than 30 days and played good film-forming property. Cured film properties of HPPENKc as follows: pencil rigidity (6 H), thermal impact resistance (300°C, 24 h), adhesion (grade 1). Curing agents were applied in dispersion, such as Hexamethoxymethyl melamine(HMMM), epichlorohydrin (ECH), triethanol amine, glycerol, etc, among them, HMMM and ECH played excellent curing property. The cooperating emulsification of Span and Tween could improve stability of HPPENK dispersion. |
| Note de contenu : |
- Structural characterization
- The effect of reaction time on thermal stability of hydrolyzates
- The effect of different alkali concentration on hydrolysis
- Co-solvents in hydrolysis
- Hydrolysis reaction temperature
- The effect of different reaction time on hydrophilicity and solubility of hydrolyzates
- Shelf-life
- Curing agents
- Emulsifier
- Heat resistant properties of cured film of HPPENK |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11485 |
in PAINTINDIA > Vol. LVII, N° 5 (05/2007) . - p. 89-100
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Novel heat resistant aqueous dispersions containing phthalazinone in PAINTINDIA, Vol. LVII, N° 5 (05/2007)
