Method for producing silica aerogel and silica aerogel produced thereby
AssigneeLG Chem, Ltd.
InventorsYoung Hun KIM, Je Kyun LEE
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Abstract
The present invention relates to a method for producing a silica aerogel and a silica aerogel produced thereby. The present invention provides a two-step process of a nucleation step of forming silica colloid particles by using a low-concentration silica precursor and a growth step of further adding a relatively high-concentration silica precursor to form a silica wet gel by using the silica colloid particles as a seed. Thus, the present invention provides a method for producing a silica aerogel of which mechanical stability is improved to enhance pore characteristics, and physical properties are readily controllable, and also provides a silica aerogel produced thereby.
Claims15
A method for producing a silica aerogel, comprising:
- 1) adding an acid catalyst and a first water glass solution to a reactor to prepare a water glass dispersion solution for forming silica colloid particles;
- 2) adding a surface modifier solution to the water glass dispersion solution for forming silica colloid particles, to form silica colloid particles;
- 3) mixing an acid catalyst with a second water glass solution to prepare a water glass dispersion solution for forming a silica wet gel;
- 4) adding the water glass dispersion solution for forming a wet gel to the reactor including the silica colloid particles to form a silica wet gel;
- and
- 5) drying the silica wet gel.
Dependencies are inferred from the claim text.