| 摘要 |
<p>There is provided a method for preparing a surface-modified transparent bead type aerogel having permanent hydrophobicity without any of additional impurity removal and washing processes by removing a sodium component from a water glass in advance, and a surface-modified bead type aerogel prepared therefrom. The method for preparing a surface-hydrophobisized bead type aerogel includes: removing a sodium component from a water glass solution, in which a water glass is diluted to a concentration of 5 to 15 % (percent) by weight, by contacting a cation exchange resin with the water glass solution at a room temperature; forming a silica wet gel by adjusting pH of the sodium-free water glass solution to a pH range of 4-6 and aging the sodium-free water glass solution; cutting the formed silica wet gel into the form of beads, when necessary; adding the cut silica wet gel to a silylation solution comprising a hydrophobic alcohol solvent and a silylating agent, and simultaneously performing silylation and solvent substitution processes on the cut silica wet gel; and drying the silica wet gel. Also, the bead type aerogel prepared from the method has a permanent hydrophobicity, and a particle size of 0.1 to 0.5 cm (centimenters). The bead type aerogel may be used for an insulating panel of a LNG carrier, transparent dual glass, etc. since it has porosity, high transparency and high specific surface area.</p> |
