Curing of a gel coat on a mold

Details Curing of a gel coat on a mold Curing of a gel coat on a mold

B - Operations, Transporting

29

C

B29C 35/10 (2006.01) B29C 35/08 (2006.01) B29C 37/00 (2006.01) B29C 39/20 (2006.01) B29C 41/28 (2006.01) B29C 41/32 (2006.01) B29C 70/50 (2006.01)

Patent

CA 2414676

Partially cured gel coats are prepared in a manner for subsequent application to a substrate, e.g. a reinforcing polymer matrix, by a process comprising the steps of :A. Applying a gel coat, e.g., an unsaturated polyester resin, to a nonporous mold, e.g., a polyester film, which is at least partially transparent to actinic radiation, e.g. UV light; andB. Exposing the surface of the gel coat that is in contact with the film, i.e., the bottom surface, to actinic radiation that has first passed through the mold. In certain embodiments of the invention, the surface of the gel coat opposite the bottom surface, i.e., the top surface, is exposed to actinic radiation shortly after the bottom surface is exposed to the actinic radiation to effect a bi- directional cure of the gel coat. The gel coat produced by the process of the invention is nonporous and essentially defect-free.

On prépare des gelcoats partiellement polymérisés d'une certaine façon en vue d'une application subséquente sur un substrat, par exemple une matrice polymère de renfort, selon un processus qui consiste à: appliquer un gelcoat, par exemple une résine polyester insaturée, sur un moule non poreux, par exemple un film polyester, qui est au moins partiellement transparent pour les rayonnements actiniques, par exemple la lumière UV et UVB, exposer la surface de ce gelcoat en contact avec le film, par exemple la surface du fond, à un rayonnement actinique qui est d'abord passé à travers le moule. Dans certains modes de réalisation de l'invention, la surface du gelcoat opposée à la surface du fond, par exemple la surface supérieure, est exposée aux rayonnements actiniques peu de temps après l'exposition de la surface du fond à ces mêmes rayonnements de façon à effectuer une polymérisation bidirectionnelle du gelcoat. Ce gelcoat produit selon ce processus est non poreux et sensiblement exempt de défauts.

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