| Titre : |
Aliphatic isocyanates blocked with volatile alcohols for decorative coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Yun Huang, Auteur ; Guobei Chu, Auteur ; Frank N. Jones, Auteur ; Marjorie Nieh, Auteur |
| Année de publication : |
1995 |
| Article en page(s) : |
p.33-40 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Alcool
Composés aliphatiques
Copolymères séquencés
Liants
Polyisocyanates
Réticulation (polymérisation)
Revêtements décoratifs:Peinture décorative
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Aliphatic polyisocyanates blocked with simple aliphatic alcohols, such as methanol and ethanol, are widely thought to require baking temperatures and times that are too high and/or too long for application of decorative coatings under production conditions. Here we show that polyisocyanates blocked with these alcohols can, when catalyzed with organotin catalysts, crosslink an acrylic polyol at temperatures comparable to those of commercial ε-caprolactam blocked crosslinkers. With 0.5% of dibutyl tin diacetate catalyst, methanol blocked 1,3-bis(1-isocyanato-1-methylethyl)benzene (TMXDI) and methanol blocked hexamethylene diisocyanate isocyanurate are effective crosslinkers for an acrylic polyol at 145 to 155°C. It is theorized that physical factors (blocking agent diffusion rate and volatility) strongly influence cure response. |
| Note de contenu : |
- INTRODUCTION AND LITERATURE REVIEW : Overview of blocked polyisocyanates - "Cure Response" of blocked polyisocyanate coatings defined - Selected previous studies on cure response - Deblocking (Unblocking) temperatures - Other factors that can affect cure response
- RESULTS : Synthesis and characterization of blocked isocyanates - Formulations and catalyst studies - Blocking agent cure rate studies
- Discussion : Technological considerations - Mechanistic considerations |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18580 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 842 (03/1995) . - p.33-40
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