Polyurethane geotextile composite liner with improved water...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/36 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2440881

A water-resistant polyurethane geotextile composite suitable for use as a liner is made by impregnating a geotextile with a water-resistant polyurethane and allowing the polyurethane impregnated in the geotextile to cure. The water- resistant polyurethane composition is a reaction product of (a) a liquid polyisocyanate having an isocyanate content of at least 10 % by weight, (b) an isocyanate having an isocyanate content of at least 10 % by weight, (b) an isocyanate-reactive component which includes (1) 20-90 % by weight castor oil having a water content of less than 0.5 % by weight, and (2) a polyether polyol in which at least 70 % by weight of the alkylene oxide is propylene oxide, and (c) a urethane catalyst. Low molecular weight diols and triols and filters may optionally be included.

L'invention concerne un composite géotextile polyuréthanne hydrorésistant à utiliser comme revêtement. On fabrique ce composite en imprégnant un géotextile avec un polyuréthanne hydrorésistant et en faisant durcir ce polyuréthanne imprégné dans le géotextile. Cette composition polyuréthanne hydrorésistante est un produit de la réaction (a) d'un polyisocyanate liquide présentant une teneur en isocyanates d'au moins 10 % en poids, (b) d'un composant réactif aux isocyanates qui renferme (1) 20 à 90 % en poids d'huile de ricin présentant une teneur en eau inférieure à 0,5 % en poids et (2) un polyol polyéther dans lequel au moins 70 % en poids de l'oxyde d'alkylène est de l'oxyde de propylène, et (c) d'un catalyseur uréthanne. Des diols et triols de faible poids moléculaire ainsi que des charges peuvent éventuellement être incorporés.

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