| abstract |
A fiber-based heat insulating material capable of manufacturing a fiber-based heat insulating material having a pore smaller than the mean free path of air and having a low bulk density supported on a fiber mat by a simple manufacturing process and its manufacture Provide a method. A gel containing tetraalkoxysilane and monoalkyltrialkoxysilane in a molar ratio of tetraalkoxysilane: monoalkyltrialkoxysilane = 0.05 to 0.35: 0.65 to 0.95. A raw material and a solvent containing 2 to 5 mol of alcohols and 3 to 6 mol of water are mixed with 1 mol of the total amount of silane compounds in the gel material, and the silane compound in the gel material is hydrolyzed to produce a sol. The resulting sol is gelled by impregnating the obtained sol into a fiber mat, and then cured to obtain a wet gel-carrying fiber mat carrying a wet gel, and the obtained wet gel-carrying fiber mat is used at normal pressure and / or Dry under reduced pressure to obtain a fiber-based insulation. [Selection figure] None |