Insulated panel for mine safe rooms
View Patent ↗A structural insulated panel for use in a mine safe room, which includes a carbon foam core having a high ratio of compressive strength to density, desirable fire retardant properties, and resistance to environmental stress. The carbon foam structural insulated panel also includes a first layer and a second layer bound to a first surface and second surface of the carbon foam core.
1. A mine safe room comprising a structural insulated panel which comprises a carbon foam material with a bimodal pore distribution with at least about 90% of the pore volume about 10 to about 150 microns in diameter and at least about 1% of the pore volume about 0.8 to about 3.5 microns, the carbon foam material exhibiting a permeability of no greater than about 3.0 darcys and the structural insulated panel further comprising a layer which comprises at least one sheet of compressed particles of exfoliated graphite on at least one surface of the carbon foam material.
2. The mine safe room of claim 1 further comprising: a first outer layer bound to the layer which comprises at least one sheet of compressed particles of exfoliated graphite; and a second outer layer bound to a second surface of the carbon foam material.
3. The mine safe room of claim 1 wherein the carbon foam material has a ratio of compressive strength to density of from about 1000 psi/(g/cc) to about 20,000 psi/(g/cc).
4. The mine safe room of claim 1 wherein the carbon foam material has a thermal conductivity of from about 0.06 W/mK to about 0.3 W/mK.
5. The mine safe room of claim 1 wherein the carbon foam material includes a coating on the carbon foam's exterior surface.
6. The mine safe room of claim 5 wherein the coating improves fire retardancy of the carbon foam material.
7. The mine safe room of claim 5 wherein the coating improves oxidation resistance of the carbon foam material.
8. The mine safe room of claim 2 wherein the outer layers are selected from the group consisting of paper, reinforced paper composites, oriented strand board, fiberboard, drywall, gypsum, gypsum composites, wood, wood composites, plywood, thermoplastics, plastic composites, resins, metals, metal alloys, metal composites, and combinations thereof.
9. The mine safe room of claim 8 , wherein the outer layer comprises fibers.
10. The mine safe room of claim 1 , which comprises at least one sheet of compressed particles of exfoliated graphite on both surfaces of the carbon foam material.
11. The mine safe room of claim 10 further comprising: a first and second outer layer, each bound to one of the layers which comprise at least one sheet of compressed particles of exfoliated graphite.