[article]
| Titre : |
Novel isocyanate-free moisture-curable polymers for single-components polysiloxane topcoats |
| Type de document : |
texte imprimé |
| Auteurs : |
Erick Lezzi, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 22-28 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Bateaux -- Revêtements:Bateaux -- Peinture
Résistance aux conditions climatiques
Résistance chimique
Réticulation à l'humidité
Revêtement monocomposant:Peinture monocomposant
Revêtements -- Finition:Peinture -- Finition
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The U.S. Naval Research Laboratory (NRL) recently developed novel alkoxysilane-terminated N-substituted urea polymers for use in moisture-curable, single-component (1K) polysiloxane topcoats for military assets. These polymers demonstrate similar mechanical properties and chemical resistance to polyurethanes, yet do not contain harmful isocyanates. The polymers can be synthesized in a variety of polar and aromatic solvents to provide low viscosity solutions, thus allowing for the generation of topcoats that are free of hazardous air pollutants (HAPs) and contain low levels of volatile organic compounds (VOCs). These polymers have been primarily utilized to formulate 1K polysiloxane topcoats for use on the exterior of Navy surface ships and aircraft, yet they are applicable to a variety of non-military markets where exterior durable topcoats are required.
For Navy ships, the 1K polysiloxane topcoat is designed as a haze gray colored system that is <250 g/l VOCs, provides a semi-gloss finish once cured, will adhere to high solids epoxy primers, and offers enhanced weatherability and hydrocarbon resistance compared to legacy Navy topcoats. The coating can be brush- and roll-applied by sailors for touchup/repair applications or spray-applied by contractors during depot-level maintenance. For Navy aircraft, the 1K topcoat is designed as a camouflage gray colored system that is <300 g/l VOCs, is spray-applied via high-volume low-pressure (HVLP) equipment, provides a low-gloss finish once cured, and demonstrates comparable flexibility, weatherability, and hydrocarbon resistance to qualified polyurethane topcoats. Gloss topcoats for Navy aircraft have also been formulated using these novel polymers. Laboratory testing of these 1K polysiloxane topcoats to military specifications (MIL-Specs.) and demonstrations on military assets will be discussed herein. |
| Note de contenu : |
- INTRODUCTION : Legacy surface ship and aircraft topcoats
- NOVEL POLYMERS FOR SINGLE-COMPONENT POLYSILOXANE TOPCOATS
- EXPERIMENTAL PROCEDURE
- RESULTS : Single-components polysiloxane topcoat for navy surface ships - Single-components polysiloxane topcoat for navy aircraft |
| En ligne : |
https://drive.google.com/file/d/1w2daqu09aumCrR2LKgt4-Lik1WgshaO5/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28868 |
in COATINGS TECH > Vol. 14, N° 8 (08/2017) . - p. 22-28
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