Aerogel blanket
The present invention relates to an aerogel blanket having a moisture impregnation rate of 28 days (MIR-28D) of 100 wt % or less, which is calculated by Equation 1 below: Moisture impregnation rate of 28 days (MIR-28D, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 28 days−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100. [Equation 1]
1 . An aerogel blanket having a moisture impregnation rate of 28 days (MIR-28D) of 100 wt % or less, which is calculated by Equation 1 below:
Moisture impregnation rate of 28 days (MIR-28D, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 28 days−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100, [Equation 1]
wherein the aerogel blanket has a room temperature (23±5° C.) thermal conductivity of 20.0 mW/mK or less.
2 . The aerogel blanket of claim 1 , wherein the moisture impregnation rate of 28 days (MIR-28D) calculated by Equation 1 above and a moisture impregnation rate of 15 minutes (MIR-15M) calculated by Equation 3 below satisfy Equation 4 below:
Moisture impregnation rate of 15 minutes (MIR-15M, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 15 minutes−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100 [Equation 3]
(
MIR
-
28
D
)
-
(
MIR
-
15
M
)
≤
100.
[
Equation
4
]
3 . The aerogel blanket of claim 1 , wherein the moisture impregnation rate of 28 days (MIR-28D) calculated by Equation 1 above and the moisture impregnation rate of 15 minutes (MIR-15M) calculated by Equation 3 below satisfy Equation 5 below:
Moisture impregnation rate of 15 minutes (MIR-15M, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 15 minutes−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100 [Equation 3]
1
≤
(
M
I
R
-
2
8
D
)
-
(
M
I
R
-
1
5
M
)
≤
9
0
.
[
Equation
5
]
4 . The aerogel blanket of claim 1 , wherein the aerogel blanket has the moisture impregnation rate of 28 days (MIR-28D) of 70 wt % or less, which is calculated by Equation 1 above.
5 . The aerogel blanket of claim 1 , wherein the aerogel blanket has the moisture impregnation rate of 15 minutes (MIR-15M) of 20 wt % or less, which is calculated by Equation 3 below:
Moisture impregnation rate of 15 minutes (MIR-15M, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 15 minutes−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100. [Equation 3]
6 . The aerogel blanket of claim 1 , wherein the aerogel blanket has a moisture impregnation rate of 96 hours (MIR-96H) of 50 wt % or less, which is calculated by Equation 2 below:
Moisture impregnation rate of 96 hours (MIR-96H, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 96 hours−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100. [Equation 2]
7 . The aerogel blanket of claim 1 , wherein the aerogel blanket has a dust generation amount of 3.0 wt % or less, which is calculated by Equation 10 below:
Dust generation amount (wt %)={(Aerogel blanket weight before vibration−Aerogel blanket weight after vibration of 18 Hz/6 mm)/Aerogel blanket weight before vibration}×100. [Equation 10]
8 . The aerogel blanket of claim 1 , wherein the aerogel blanket comprises an aerogel and a substrate for a blanket, wherein the aerogel is formed inside and on the surface of the substrate for a blanket.
9 . The aerogel blanket of claim 8 , wherein the aerogel comprises a hydrophobic group inside of the aerogel.
10 . An aerogel blanket having a moisture impregnation rate of 28 days (MIR-28D) of 100 wt % or less, which is calculated by Equation 1 below:
Moisture impregnation rate of 28 days (MIR-28D, wt %)={(Aerogel blanket weight after impregnation in distilled water of 21±2° C. for 28 days−Aerogel blanket weight before impregnation in distilled water)/Aerogel blanket weight before impregnation in distilled water}×100, [Equation 1]
wherein the aerogel blanket includes a blanket and a catalyzed sol, the catalyzed sol includes a silica precursor composition,
the silica precursor composition comprises a silicate containing a hydrophobic group and a tetraalkyl silicate,
a surface of the aerogel blanket is not modified by a surface modification reaction separate from a hydrophobilizing reaction with the silicate containing a hydrophobic group, and
the aerogel blanket has a room temperature (23±5° C.) thermal conductivity of 20.0 mW/mK or less.
11 . The aerogel blanket of claim 10 , wherein the silicate containing a hydrophobic group comprises one or more selected from the group consisting of methyltriethoxysilane (MTES), trimethylethoxysilane (TMES), trimethylsilanol (TMS), methyltrimethoxysilane (MTMS), dimethyldiethoxysilane (DMDEOS), ethyltriethoxysilane (ETES), and phenyltriethoxysilane (PTES).
12 . The aerogel blanket of claim 10 , wherein the tetraalkyl silicate comprises one or more selected from the group consisting of tetramethyl orthosilicate (TMOS), tetraethyl orthosilicate (TEOS), tetrapropyl orthosilicate, tetraisopropyl orthosilicate, tetrabutyl orthosilicate, tetra secondary butyl orthosilicate, tetra tertiary butyl orthosilicate, tetrahexyl orthosilicate, tetracyclohexyl orthosilicate, and tetradodecyl orthosilicate.
13 . The aerogel blanket of claim 10 , wherein a molar ratio of the silicate containing a hydrophobic group to the tetraalkyl silicate in the silica precursor composition is 60:40 to 98:2.
14 . The aerogel blanket of claim 10 , wherein a molar ratio of the silicate containing a hydrophobic group to the tetraalkyl silicate in the silica precursor composition is 85:15 to 98:2.
15 . The aerogel blanket of claim 10 , wherein a molar ratio of the silicate containing a hydrophobic group to the tetraalkyl silicate in the silica precursor composition is 90:10 to 98:2.
16 . The aerogel blanket of claim 10 , wherein silica (SiO 2 ) contained in the catalyzed sol is 3 wt % to 30 wt %.
17 . The aerogel blanket of claim 10 , wherein silica (SiO 2 ) contained in the catalyzed sol is 5 wt % to 20 wt %.
18 . The aerogel blanket of claim 10 , wherein silica (SiO 2 ) contained in the catalyzed sol is 6 wt % to 12 wt %.