Silica powders for powder evacuated thermal insulating panel and

Details Silica powders for powder evacuated thermal insulating panel and Silica powders for powder evacuated thermal insulating panel and

1994-08-31

1996-01-02

Thomas, Alexander S.

Stock material or miscellaneous articles

Sheet including cover or casing

Filled with gas other than air; or under vacuum

428 76, 428402, B32B 106

Patent

active

054806968

ABSTRACT:
A powder evacuated thermal insulating panel using generally spherical and porous silica particles of a median size less than about 100 nanometers in diameter, a pour packing density of about 0.4 to 0.6 g/cm.sup.3 and an external surface area in the range of about 90 to 600 m.sup.2/ g is described. The silica powders are prepared by reacting a tetraakyl silicate with ammonia and water in an alcohol solvent, distilling the solution after the reaction to remove the ammonia and recover the alcohol. The resulting aqueous slurry was dried, ball-milled, and dried again to provide the silica particles with defined internal and external porosity. The nanometer size and the large external surface area of the silica particles along with the internal and external porosity of the silica particles provide powder evacuated thermal insulating panels with significantly higher R-values than obtainable using previously known silica powders.

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