Method of producing a polyurethane foam molded article

Details Method of producing a polyurethane foam molded article Method of producing a polyurethane foam molded article

C - Chemistry, Metallurgy

08

J

C08J 9/34 (2006.01) B29C 44/04 (2006.01) C08G 18/76 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2590611

A method of producing a polyurethane molded article is provided, in which one molding machine which can provide distinctly polyisocyanate component(s) and two kinds of polyol components is used, and prior to completion of the feed of a first polyurethane mixture liquid containing a polyisocyanate and a polyol component without a blowing agent into a mold, a second polyurethane mixture liquid containing a polyisocyanate and a second polyol component with a blowing agent is fed into the mold. The method produces, in a single stage, a polyurethane foam molded article having the skin or high density portion selectively formed on portions of the molded article actually requiring them, where the proportions of the skin and the high density portion and the foamed core can be varied freely.

L'invention concerne un procédé de production d'un article moulé en polyuréthane, dans lequel est utilisée une machine de moulage pouvant fournir distinctement un/des composant(s) polyisocyanate et deux types de composants polyol, et préalablement à la fin de l'alimentation d'un premier liquide de mélange de polyuréthane contenant un polyisocyanate et un composant polyol sans agent d'expansion dans un moule, un second liquide de mélange de polyuréthane contenant un polyisocyanate et un second composant polyol avec un agent d'expansion est alimenté dans le moule. Le procédé permet de produire, en une seule étape, un article moulé en mousse de polyuréthane présentant la peau ou la partie haute densité sélectivement formée sur des parties de l'article moulé les nécessitant réellement, les proportions de la peau et de la partie haute densité par rapport à l'âme en mousse pouvant être modifiées librement.

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