Rigid polyurethane-isocyanurate reinforcing foams

B - Operations – Transporting – 32 – B

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B32B 27/40 (2006.01) C08G 18/02 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2603222

A structural member is reinforced with a thermoset polymer foam having (a) a density of 80 - 650 kg/m3, (b) a storage modulus, measured on a 12 mm wide x 3.5 mm thick x 17.5 single cantilever sample according to ASTM D 4065-01, under conditions of 1 Hz and a heating rate of 2~C/min, such that the ratio of the storage modulus at 0~C, expressed in MPa, divided by the density of the thermoset polymer foam, expressed in kg/m3, is at least 0.4, and (c) the ratio of the storage modulus of the thermoset polymer foam at 100~C divided by the storage modulus of the thermoset polymer foam at 0~C is at least 0.5. The foam is preferably a polyurethane-isocyanurate foam. The foam exhibits excellent resistance to cracking due to mechanical and thermal stresses.

Cette invention concerne un élément structurel renforcée par une mousse polymère thermofixée possédant (a) une densité de 80 - 650 kg/m3, (b) un module de conservation, mesuré sur un échantillon unique en porte-à-faux de 12 mm de largeur x 3,5 mm d'épaisseur x 17.5 de longueur selon ASTM D 4065-01, soit sous 1 Hz et pour une vitesse de chauffage de 2 °C/mn, tel que le rapport entre le module de conservation de la mousse de polymère thermofixée à 0 °C, exprimée en Mpa, divisé par la densité de ladite mousse, exprimée en kg/m3, est d'au moins 0,4, et (c) le rapport de conservation de la mousse polymère thermofixée à 100 °C divisée par le module de conservation de cette même mousse à 0 °C est d'au moins 0,5. La mousse, de préférence une mousse de polyuréthane-isocyanurate, présente une résistance remarquable aux fissures dues à des contraintes mécaniques et thermiques.

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