| Titre : |
Use of fluoropolymer permanent release coatings for molded polyurethane foam production |
| Type de document : |
texte imprimé |
| Auteurs : |
Leandro Figueiredo, Auteur ; Pedro Bandeira, Auteur ; Adélio Mendes, Auteur ; Margarida M. S. M. Bastos, Auteur ; Fernà o D. Magalhà es, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 757-764 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Démoulage
Fluoropolymères
Isocyanates
Mousses plastiques
Polytétrafluoréthylène
Polyuréthanes
Revêtements
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The problem of adhesion of polyurethane foams to fluoropolymer permanent release mold coatings was studied. Two coatings, based on polytetrafluoroethylene (PTFE) and perfluoroalkoxy polymer (PFA) aqueous dispersions, respectively, were applied on aluminum plates, and the foam release performance evaluated. The PTFE coating displayed gradual loss of antiadhesion properties with consecutive exposure to the reactive mixture, which was associated with isocyanate surface penetration. Penetrant mass uptake experiments, performed on free films, indicated that PTFE retains about 10 times more isocyanate than PFA, probably because of its porous surface morphology. A synergistic effect was found by applying a very small quantity of a waterborne release agent on the PTFE coating, before every foam molding cycle. The release agent formed a protective barrier that minimized contact of the coating with the reactive mixture, allowing for stable and robust foam release performance. The problem of polyurea build-up, associated with the use of aqueous release agents, was not observed because of the small amounts of compound used. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Polyurethand foam formulation and molding - Evaluation - Evaluation of the release force and release force and release work - FTIR spectrocopy - Scanning electron microscopy - Penetrant mass uptake measurements
- RESULTS AND DISCUSSION : Surface morphology - Penetrant mass uptake - Foam release performance of PTFE and PFA coatings - Performance of PTFE coating combined with release agent |
| DOI : |
10.1007/s11998-012-9413-y |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9413-y.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16661 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 6 (11/2012) . - p. 757-764
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Use of fluoropolymer permanent release coatings for molded polyurethane foam production in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)
