PREPARATION METHOD OF HYDROPHOBIC MONOLITH TYPE SILICA AEROGEL

摘要

The present invention relates to a method for dipping monolith type silica aerogel synthesized in a alkylsilane solution which is a dipping solution using a alkoxide precursor and provides a method for preparing hydrophobic monolith type silica aerogel, wherein the method includes a step of making hydrophobic surface and inside of the monolith type silica wet gel. According to the present invention, hydrophobicity can be rapidly and economically given to monolith type silica aerogel in a simple way using a small amount of alkyl silane, the shrinkability of the hydrophobic monolith type silica aerogel is reduced, allows manufacture in a semi-transparent form, low thermal conductivity which is similar to the hydrophilic silica aerogel can be maintained, and application as a heat insulation plate is possible due to improved hydrophobicity and thermal insulation. [Reference numerals] (AA) Monolith type wet gel producing step;(BB) Hydrogenating step using a dipping solution;(CC) Supercritical drying step;(DD) Hydrophobic silica aerogel