Production method of polyurethane foam molded article

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/30 (2006.01) C08G 18/09 (2006.01)

Patent

CA 2590692

The present invention provides a method for producing a polyurethane foam molded article from a polyisocyanate compound, a polyol mixture containing polyol, a catalyst and a crosslinking agent, and a blowing agent, said method comprising continuously injecting the polyisocyanate compound, the polyol mixture and the blowing agent into a mold, using a molding machine capable of separately supplying the polyisocyanate compound, the polyol mixture and the blowing agent, while the timing of starting to inject the blowing agent is delayed after the start of injecting the polyisocyanate compound and the polyol mixture. The inventive 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 porportions of the skin and the high density portion and the foamed core can be varied freely.

La présente invention concerne un procédé de production d'un article moulé en mousse de polyuréthanne effectué à partir d'un composé polyisocyanate, d'un polyol contenant un mélange de polyols, d'un catalyseur et d'un agent de réticulation, et enfin d'un agent gonflant. Le procédé consiste à injecter en continu le composé isocyanate, le mélange de polyols et l'agent gonflant dans un moule, à l'aide d'une machine capable d'apporter séparément le composé isocyanate, le mélange de polyols et l'agent gonflant, alors que le temps de démarrage de l'injection de l'agent gonflant est retardé après le début de l'injection du composé isocyanate et du mélange de polyols. Le procédé selon l'invention produit, en une seule étape, un article moulé en mousse de polyuréthanne dont la partie enveloppe ou à haute densité est formée sélectivement sur des parties de l'article moulé qui les nécessite vraiment, les proportions des parties enveloppe et à haute densité et du noyau en mousse pouvant varier librement.

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