[article]
| Titre : |
High-Solids coatings using benzylanilinium sulfonates-II a,a-dimethylbenzylpyridinium p-toluenesulfonate, an effective blocked sulfonic acid |
| Type de document : |
texte imprimé |
| Auteurs : |
S. Nakano, Auteur ; T. Morimoto, Auteur ; T. Endo, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 83-90 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Ammoniums quaternaires -- Composés
Benzène -- Dérivés
Catalyseurs
Haut extrait sec
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Réticulation (polymérisation)
Stabilité au stockage
Sulfonates
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
α,α-Dimethylbenzylpyridinium ρ-toluenesulfonate (1), a new class of blocked sulfonic acids, was synthesized in good yield and some properties of 1 were compared with those of N-(ρ-methoxybenzyl)-N,N-dimethylanilinium ρ-toluenesulfonate (2), an effective blocked sulfonic acid. 1H-NMR analysis showed that 1 and 2 were able to release the corresponding amine blocked ρ-toluenesulfonic acid during the reaction with H2O and that the unblocking temperatures were 80°C and 75°C, respectively. Consequently, each aqueous solution turned acidic from neutral around 80°C. Furthermore, the hydrolysis properties of 1 and 2 were estimated by measuring the rate of hydrolysis for 1 and 2. It was found that the 1 activation energy (Ea) was higher than the 2 Ea during hydrolysis. Consequently, 1 showed better thermal latency than 2. |
| Note de contenu : |
- EXPERIMENTAL : Synthesis of pyridinium SbF6 (5) - Synthesis of a,a-dimethylbenzylpyridinium SbF6 (1) - Measurement of pH of the aqueous solutions - Estimation of rate of hydrolysis - Estimation of unblocking temperatures - Synthesis of the acrylic polyol - Formulation of clear coating solutions - Evaluation of crosslinking reaction - Evaluation of storage stability
- RESULTS AND DISCUSSION : Synthesis of benzylpyridinium salts (1) - Synthesis of benzylanilinium sulfonates (2) - Temperature dependency of pH for aqueous solution containing catalysts - Stability of catalysts in aqueous solution - Rate of hydrolysis of catalysts - Unblocking reaction of catalysts - Properties of coating solutions - Crosslinking reaction of coating solutions - Storage stability of coating solutions |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18439 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 83-90
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