Pre-insulated pipes and process for their production

Details Pre-insulated pipes and process for their production Pre-insulated pipes and process for their production

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 59/14 (2006.01) B29C 44/32 (2006.01) F16L 59/02 (2006.01)

Patent

CA 2352350

Pre-insulated pipe comprising an inner pipe surrounded by a casing with arranged thereinbetween a single one-piece layer of insulation material comprising a polyisocyanurate-modified polyurethane foam. These pre-insulated pipes can be produced in a continuous process, wherein a foaming mixture comprising (a) a suitable polyol component, (b) a suitable polyisocyanate component in such amount that the isocyanate index is at least 150, (c) at least one polyisocyanurate catalyst and optionally one or more polyurethane catalysts, and (d) suitable ancillary chemicals, is continuously brought into contact with the outer surface of an inner pipe and is allowed to expand into a polyisocyanurate-modified polyurethane foam, after which a casing is applied around this a polyisocyanurate-modified polyurethane foam.

L'invention porte sur ces conduites préisolées comportant un tube intérieur entouré d'une enveloppe et un matériau isolant de polyuréthane expansé modifiée au polyisocyanurate d'une seule pièce les séparant. Lesdites conduites peuvent être produites selon un processus continu selon lequel on met en contact avec la surface extérieure du tube intérieur un mélange de mousse comportant: (a) un composant adéquate de polyol, (b) un composant adéquate de polyisocyanate en quantité telle que l'indice d'isocyanate soit d'au moins 150, (c) au moins un catalyseur du polyisocyanurate et facultativement un ou plusieurs catalyseurs du polyuréthane, et (d) des produits chimiques auxiliaires idoines. Ledit mélange se transforme en polyuréthane expansé modifiée au polyisocyanurate après quoi on applique l'enveloppe autour dudit polyuréthane expansé.

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