Improved polyurethane/geotextile composite and a process...

D - Textiles – Paper – 06 – M

Patent

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Details

D06M 15/568 (2006.01) C08G 18/48 (2006.01) C08L 75/08 (2006.01) D06M 23/06 (2006.01) D06N 3/14 (2006.01) E02B 3/12 (2006.01) E02B 5/02 (2006.01)

Patent

CA 2440633

A polyurethane/geotextile composite having greater strength and dimensional stability than composites made with filled polyurethanes is produced by impregnating a geotextile with an unfilled polyurethane composition and allowing the polyurethane composition to cure. The polyurethane composition employed is reaction product of a liquid polyisocyanate having an isocyanate content of at least 10% by weight, a high molecular weight polyether polyol, and an organometallic catalyst. A low molecular weight diol or triol may optionally be included in the polyurethane-forming reaction mixture. These polyurethane/geotextile composites are particularly suitable for lining ditches and canals.

L'invention concerne un composite polyuréthanne/géotextile possédant une résistance mécanique et une stabilité dimensionnelle supérieures à celles de composites fabriqués avec des polyuréthannes chargés. Le procédé de production de ce composite consiste à imprégner un géotextile avec une composition polyuréthanne non chargée et à permettre à cette composition polyuréthanne de durcir. La composition polyuréthanne employée est un produit de réaction d'un polyisocyanate liquide possédant un contenu d'isocyanate d'au moins 10 % en poids, un polyol de polyéther à poids moléculaire élevé et un catalyseur organométallique. Un diol ou un triol à poids moléculaire faible peut éventuellement être inclus dans le mélange de réaction destiné à former le polyuréthanne. Ces composites polyuréthanne/géotextile sont particulièrement adaptés au revêtement de caniveaux et de canaux.

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