Aerogel compositions with enhanced performance
Aerogel materials, aerogel composites, and the like may be improved by the addition of opacifiers to reduce the radiative component of heat transfer. Such aerogel materials, aerogel composites, and the like may also be treated to impart or improve hydrophobicity. Such aerogel materials and methods of manufacturing the same are described.
1. An aerogel composition comprising an aerogel material, the aerogel material comprising (1) an opacifying compound, (2) a hydrated filler, and (3) hydrophobic materials covalently attached to a surface of the aerogel material, wherein the opacifying compound is embedded within the aerogel material.
2. The aerogel composition of claim 1 , further comprising a fibrous structure.
3. The aerogel composition of claim 2 , wherein the fibrous structure is in a woven, nonwoven, mat, felt, batting, or a combination thereof.
4. The aerogel composition of claim 1 , wherein the opacifying compound is selected from the group consisting of B 4 C, Diatomite, Manganese ferrite, MnO, NiO, SnO, Ag 2 O, Bi 2 O 3 , TiC, WC, carbon black, titanium oxide, iron titanium oxide, zirconium silicate, zirconium oxide, iron (I) oxide, iron (III) oxide, manganese dioxide, iron titanium oxide (ilmenite), chromium oxide, silicon carbide, and combinations thereof.
5. The aerogel composition of claim 1 , wherein the opacifying compound comprises silicon carbide.
6. The aerogel composition of claim 1 , wherein the hydrated filler comprises hydroxides, borates, silicates, carbonates, oxides, or combinations thereof.
7. The aerogel composition of claim 6 , wherein the hydroxides comprise metal hydroxides.
8. The aerogel composition of claim 7 , wherein the metal hydroxides comprise magnesium hydroxide.
9. The aerogel composition of claim 7 , wherein the metal hydroxides comprise aluminum hydroxide.
10. The aerogel composition of claim 7 , wherein the metal hydroxides are present at a level of 1 to 40 percent by weight of the aerogel composition.
11. The aerogel composition of claim 6 , wherein the borates comprise zinc borate.
12. The aerogel composition of claim 11 , wherein the zinc borate is present at a level of 1 to 40 percent by weight of the aerogel composition.
13. The aerogel composition of claim 6 , wherein the silicates comprise aluminum silicate.
14. The aerogel composition of claim 13 , wherein the aluminum silicate is present at a level of less than 50 percent by weight of the aerogel composition.
15. The aerogel composition of claim 13 , wherein the aluminum silicate is present at a level of 5 to 50 percent by weight of the aerogel composition.
16. The aerogel composition of claim 6 , wherein the carbonates comprise a hydrated metal carbonate.
17. The aerogel composition of claim 16 , wherein the hydrated metal carbonate is present at a level of 1 to 40 percent by weight of the aerogel composition.
18. The aerogel composition of claim 6 , wherein the oxides comprise aluminum oxide.
19. The aerogel composition of claim 18 , wherein the aluminum oxide comprises aluminum oxide hydroxide.