Methods and compositions for coating pipe

Details Methods and compositions for coating pipe Methods and compositions for coating pipe

C - Chemistry, Metallurgy

08

J

C08J 7/04 (2006.01) B32B 1/08 (2006.01) F16L 11/04 (2006.01)

Patent

CA 2739478

Compositions and methods for producing multi-layered plastic pipes are described. Some embodiments of the compositions comprise a cross-linkable polymer system (for example, based on either acrylate or epoxy chemistry), a photoinitiator, and one or more additives such as a pigment, an antioxidant, a light stabilizer, or other additive. In an exemplary method of producing a multi-layered plastic pipe, a base pipe, for example comprising cross-linked polyethylene, is conveyed through an oxidizing step in which at least the outer surface of the base pipe is oxidized, through a coating step in which a pre-polymer system is applied to the outer surface of the base pipe and through a curing step in which the pre-polymer is cured to form a layer of the pipe.

La présente invention concerne des compositions et des procédés permettant la production de conduites multicouches en matière plastique. Selon certains modes de réalisation, les compositions comportent un système polymère réticulable (par exemple, à base dacrylate ou de chimie époxyde), un photoamorceur, et un ou des additifs tel quun pigment, un antioxydant, un stabilisateur de lumière, ou autre additif. Selon un procédé représentatif de production dune conduite multicouche en matière plastique, une conduite de base, par exemple comportant du polyéthylène réticulé, est transporté en une étape de traitement doxydation lors de laquelle la surface extérieure de la conduite de base est oxydée, une étape de revêtement lors de laquelle un système pré-polymère est appliqué à la surface extérieure de la conduite de base et une étape de durcissement lors de laquelle le pré-polymère est durci pour former une couche de la conduite.

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