| 摘要 |
PROBLEM TO BE SOLVED: To provide a foamed silica gel suitable as a filler to be compounded in a curable composition for a heat-insulating coating material, and a method for manufacturing it. SOLUTION: The foamed silica gel characterized by that the inside of a particle is formed as porous and the outer surface of the particle is wholly covered with a dense outer film by firing a silica gel containing 0.01-2.00 mass% sodium sulfate and having a particle diameter of 0.5-10.0 mm at 950-1,150°C for 0.05-5 hr, is obtained. This foamed silica gel preferably contains 0.003-0.65 mass% sodium in the particle, has a particle diameter of 1.0-10.0 mm, has a mean value of the specific gravity of 0.05-0.50, and is suitable as the filler to be compounded in the curable composition for the heat-insulating coating composition. COPYRIGHT: (C)2005,JPO&NCIPI
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