Rigid polyurethane-isocyanurate reinforcing foams

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 widex3.5 mm thickx17.5 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...

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Bibliographic Details
Main Authors MIRYALA SRIKANTH, LEKOVIC HUZEIR
Format Patent
LanguageChinese
English
Published 09.04.2008
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
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Summary: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 widex3.5 mm thickx17.5 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.
Bibliography:Application Number: CN200580049414