In-press process for coating composite substrates

B - Operations – Transporting – 27 – N

Patent

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Details

B27N 3/06 (2006.01) B05D 3/12 (2006.01) B05D 7/00 (2006.01) B05D 3/02 (2006.01)

Patent

CA 2349233

An improved process for manufacture of polymer coated composite substrates is described. A coated composite substrate is prepared in the press by applying a layer of a primer coating composition to the surface of a compressible mat comprising fibers and/or particles and a resin binder. The primer coating composition is formulated preferably as a fast setting polymer latex capable of forming a chemically crosslinked polymer matrix when applied to the surface of a compressible mat. A thermosetting top coat composition can be applied directly over the wet primer coating composition before heat-processing the mat to improve surface quality and release characteristics. Compressing and heating the coated mat produces a primed composite substrate directly out of the press.

La présente invention concerne un procédé perfectionné permettant de fabriquer des substrats composites couchés de polymères. Pour préparer un tel substrat composite couché dans la presse, on applique une couche d'une composition de couche d'apprêt sur la surface d'un mat compressible à base de fibres et/ou de particules et d'un liant résinique. La composition de couche d'apprêt est formulée de préférence en latex polymère à prise rapide capable de constituer une matrice polymère chimiquement réticulée lorsqu'on l'applique sur la surface d'un mat compressible. Pour améliorer la qualité de surface et l'aptitude au décollement, on peut appliquer une composition de couche de finition thermodurcissable directement sur la couche d'apprêt encore fraîche, avant même le traitement thermique. La compression et le chauffage du mat couché permettent ainsi d'obtenir un substrat composite apprêté, directement en sortie de presse.

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