Method for epoxy foam production using a liquid anhydride
| DWPI Title: Making epoxy foam, comprises forming resin mixture of epoxy resin with tert-butoxycarbonyl anhydride compound and imidazole catalyst at temperature sufficient to keep the resin mixture reacting to form foaming resin |
| Abstract: An epoxy resin mixture with at least one epoxy resin of between approximately 50 wt % and 100 wt %, an anhydride cure agent of between approximately 0 wt % and approximately 50 wt %, a tert-butoxycarbonyl anhydride foaming agent of between proximately 0.1-20 wt %, a surfactant and an imidazole or similar catalyst of less than approximately 2 wt %, where the resin mixture is formed from at least one epoxy resin with a 1-10 wt % tert-butoxycarbonyl anhydride compound and an imidazole catalyst at a temperature sufficient to keep the resin in a suitable viscosity range, the resin mixture reacting to form a foaming resin which in the presence of an epoxy curative can then be cured at a temperature greater than 50° C. to form an epoxy foam. |
| Use: The methods are useful for making epoxy foam. |
| Advantage: The methods utilize tert-butoxycarbonyl anhydride as a liquid foaming agent which under suitable catalytic conditions triggers to decompose and yield large quantities of carbon dioxide for resin expansion. |
| Novelty: Making an epoxy foam, comprises either: (M1) forming resin mixture of at least one epoxy resin with tert-butoxycarbonyl anhydride compound (0.1 -20 wt.%) and imidazole catalyst at a temperature sufficient to keep the resin mixture reacting to form foaming resin; or (M2) forming resin mixture of at least one epoxy resin with 10-100 pph anhydride epoxy cure agent, tert-butoxycarbonyl anhydride compound (0.1-20 wt.%), surfactant and imidazole catalyst at a temperature sufficient to keep the resin mixture reacting to form foaming resin, and curing foaming resin at temperature greater than 50° C. |
| Filed: 9/8/2009 |
| Application Number: US2009555251A |
| Tech ID: SD 11284.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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