Rigid polyurethane-isocyanurate reinforcing foams

• Main Authors: MIRYALA SRIKANTH, LEKOVIC HUZEIR, BRAUN ARNOLD W. JR, ALLEN MARK P
• Format: Patent
• Language: Chinese; English
• Published: 22.09.2010
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

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 DEG C/min, such that the ratio of the storage modulus at 0 DEG 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 DEG C divided by the storage modulus of the thermoset polymer foam at0 DEG 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.