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EP-4737419-A1 - AEROGEL COMPOSITE

EP4737419A1EP 4737419 A1EP4737419 A1EP 4737419A1EP-4737419-A1

Abstract

The present invention relates to an aerogel composite that, when applied as an insulation material to a battery, an electronic device, a vehicle, an industrial device, a structure, or the like, maintains excellent insulation properties even when compressed and deformed by being subjected to pressure due to various causes.

Inventors

  • KIM, MI RI
  • KANG, Taegyeong
  • OH, Kyoungshil

Assignees

  • LG Chem, Ltd.

Dates

Publication Date
20260506
Application Date
20240628

Claims (18)

  1. An aerogel composite comprising: a fiber substrate, and an aerogel including one or more pores, wherein when the aerogel composite is compressed by application of pressures of 3 bar, 9 bar, and 24 bar, respectively, in a transverse direction with respect to the aerogel composite, a heat transmission coefficient after the compression is not more than 1.8 times the heat transmission coefficient before the compression, and the heat transmission coefficient before and after the compression of the aerogel composite satisfies Equation 3 below: {(Heat transmission coefficient (a) before and after compression - Average value (b) of heat transmission coefficients before and after compression)}= (Average value (b) of heat transmission coefficients before and after compression) X A wherein the heat transmission coefficient (a) before and after compression is a heat transmission coefficient obtained after performing compression with a pressure of 0 bar, 3 bar, 9 bar, or 24 bar in the transverse direction with respect to the aerogel composite; the average value (b) of heat transmission coefficients before and after compression is an average value of heat transmission coefficients obtained after performing compression with pressure values of 0 bar, 3 bar, 9 bar, and 24 bar, respectively, in the transverse direction with respect to the aerogel composite; and A is a rational number of from - 0.25 to + 0.25.
  2. The aerogel composite of claim 1, wherein when the aerogel composite is compressed by application of pressures of 3 bar, 9 bar, and 24 bar, respectively, in the transverse direction with respect to the aerogel composite, the heat transmission coefficient after the compression is greater than 1 time and not more than 1.8 times the heat transmission coefficient before the compression.
  3. The aerogel composite of claim 1, wherein when the aerogel composite is applied with a pressure of 3 bar in the transverse direction with respect to the aerogel composite, the heat transmission coefficient after the compression is not more than 1.45 times the heat transmission coefficient before the compression.
  4. The aerogel composite of claim 1, wherein when the aerogel composite is applied with respective pressures of 3 bar, 9 bar, and 24 bar in the transverse direction with respect to the aerogel composite, the compression recovery rate represented by Equation 1 below is 60% or greater: Compression recovery rate (%) = {(Cross-sectional thickness of aerogel composite after compression)/(Cross-sectional thickness of aerogel composite before compression)} X 100.
  5. The aerogel composite of claim 4, wherein when the aerogel composite is applied with respective pressures of 3 bar, 9 bar, and 24 bar in the transverse direction with respect to the aerogel composite, the compression recovery rate represented by Equation 1 below is from 60% to 99%.
  6. The aerogel composite of claim 1, wherein the heat transmission coefficient obtained after performing compression with pressures of 3 bar, 9 bar, and 24 bar, respectively, in the transverse direction with respect to the aerogel composite satisfies Equation 4 below: (Heat transmission coefficient (c) after compression - Average value (d) of heat transmission coefficients after compression) = (Average value (d) of heat transmission coefficients after compression) X B wherein the heat transmission coefficient (c) after compression is a heat transmission coefficient obtained after performing compression with a pressure of 3 bar, 9 bar, or 24 bar in the transverse direction with respect to the aerogel composite; the average value (d) of heat transmission coefficients after compression is an average value of heat transmission coefficients obtained after performing compression by applying pressures of 3 bar, 9 bar, and 24 bar, respectively, in the transverse direction with respect to the aerogel composite; and B is a rational number of from - 0.25 to + 0.25.
  7. The aerogel composite of claim 1, wherein a change rate (C) of heat transmission coefficient after performing compression per unit application pressure represented by Equation 5 below on the aerogel composite is a rational number of from - 0.10 to + 0.10: C = (Heat transmission coefficient after performing compression with pressure of x - Heat transmission coefficient after performing compression with pressure of y)/(x - y) wherein x and y are each independently a pressure value (unit bar) of 3 bar, 9 bar, or 24 bar, and are different from each other.
  8. The aerogel composite of claim 1, wherein the aerogel comprises pores having a pore diameter of 30 nm or less at 30% to 45% of pore volume of a framework structure of the aerogel.
  9. The aerogel composite of claim 8, wherein the aerogel comprises pores having a pore diameter of 0.1 nm to 30 nm at 30% to 45% of pore volume of a framework structure of the aerogel.
  10. The aerogel composite of claim 1, wherein the aerogel comprises pores having a pore diameter of 30 nm or less at 37.5% to 38.5% of pore volume of a framework structure of the aerogel.
  11. The aerogel composite of claim 1, wherein the aerogel composite has a density of 0.05 g/cm 3 to 0.50 g/cm 3 .
  12. The aerogel composite of claim 1, wherein the aerogel composite has a density of 0.200 g/cm 3 to 0.205 g/cm 3 .
  13. The aerogel composite of claim 1, wherein the aerogel is a silica aerogel.
  14. The aerogel composite of claim 1, wherein the heat transmission coefficient after the compression is measured after one hour after the completion of the compression.
  15. The aerogel composite of claim 6, wherein the heat transmission coefficient after the compression is measured after one hour after the completion of the compression.
  16. The aerogel composite of claim 1, wherein when the aerogel composite is applied with a pressure of 3 bar in a transverse direction with respect to the aerogel composite, the heat transmission coefficient after the compression is greater than, or not more than 1.1 times the heat transmission coefficient before the compression, and when the aerogel composite is applied with a pressure of 9 bar, the heat transmission coefficient after the compression is 1.1 to 1.3 times the heat transmission coefficient before the compression, and when the aerogel composite is applied with a pressure of 24 bar, the heat transmission coefficient after the compression is 1.25 to 1.35 times the heat transmission coefficient before the compression.
  17. A heat insulation member comprising the aerogel composite of any one of claims 1 to 16.
  18. The heat insulation member of claim 17, wherein the heat insulation member further comprises a support member positioned on at least one surface of an upper surface or a lower surface of the aerogel composite.

Description

TECHNICAL FIELD This application claims priority to Korean Patent Application No. 10-2023-0083943 filed on June 29, 2023, Korean Patent Application No. 10-2023-0097729 filed on July 26, 2023, and U.S. Patent Application Nos. 18/386,103 and 18/386,108 filed on November 1, 2023, the contents of which are incorporated by reference in their entirety. The present invention relates to an aerogel composite and the application use thereof as a heat insulation material. BACKGROUND An aerogel is a super-porous, high specific surface area (≥500 m2/g) material having a porosity of approximately 90.0 % to 99.9% and a pore size in the range of 1 nm to 100 nm, and is a material having excellent properties ultralight weight/super-heat insulation/ultra-low dielectric, and the like. Accordingly, research on the development of aerogel materials as well as research on the application use thereof as transparent insulation materials and environmentally friendly high-temperature heat insulation materials, ultra-low dielectric thin films for highly integrated devices, catalysts and catalyst carriers, electrodes for supercapacitors, and electrode materials for seawater desalination have been actively conducted. The biggest advantages of an aerogel are that it has super-insulation properties exhibiting a thermal conductivity of approximately 0.300 W/m·K or less, which is lower than that of a conventional organic heat insulation material such as Styrofoam, thereby solving the problems associated with the conventional organic heat insulation material, such as fire vulnerability and generation of harmful gases in case of a fire. In general, an aerogel is produced by preparing a hydrogel from a silica precursor such as water glass and an alkoxysilane group (TEOS, TMOS, MTMS, and the like) and removing a liquid component inside the hydrogel without destroying a microstructure. Particularly, a hydrophobic silica aerogel blanket in which a hydrophobic silica aerogel is formed in a fiber is a functional heat insulation material which prevents corrosion by moisture, and is widely used in construction or industrial fields, and in addition, the hydrophobic silica aerogel blanket may be used as a heat insulation material, thermal insulation material, or non-combustible material for aircraft, ships, automobiles, batteries, and the like. However, when the silica aerogel blanket is applied for the above uses, there have been problems in that when a pressurization environment is provided due to continuous thermal expansion of a device positioned adjacent thereto, or when a large pressure is applied from the surroundings during the installation of an aerogel heat insulation material, the aerogel structure collapses, so that the heat insulation properties are significantly reduced. DISCLOSURE Technical problem The present invention provides an aerogel composite capable of maintaining constant heat insulation properties without significant degradation even when exposed to a pressurization environment. However, the technical task to be achieved by the present invention is not limited to the aforementioned task, and other tasks that are not mentioned will be clearly understood by those skilled in the art from the following description. Technical Solution In accordance with some embodiments of the present invention, an aerogel composite includes a fiber substrate, and an aerogel including one or more pores, wherein when the aerogel composite is compressed by application of a pressure of any one of 3 bar, 9 bar, or 24 bar in a horizontal direction (transverse direction) with respect to a cross-section of the aerogel composite along in the horizontal direction (transverse direction), the heat transmission coefficient after the compression is not more than 1.8 times the heat transmission coefficient before the compression, and the heat transmission coefficient before and after the compression of the aerogel composite satisfies Equation 3 below. {(Heat transmission coefficient (a) before and after compression - Average value (b) of heat transmission coefficients before and after compression)}= (Average value (b) of heat transmission coefficients before and after compression) X A In Equation 3 above, the heat transmission coefficient (a) before and after compression means the heat transmission coefficient obtained after performing compression with a pressure of 0 bar, 3 bar, 9 bar, or 24 bar in the horizontal direction (transverse direction) with respect to the cross-section of the aerogel composite, the average value (b) of heat transmission coefficients before and after compression means the average value of the heat transmission coefficient an unpressurized aerogel composite, and the heat transmission coefficients obtained after performing compression with a pressure of pressure values of 3 bar, 9 bar, and 24 bar in the horizontal direction (transverse direction) with respect to the cross-section of the aerogel composite, and the A is a rational number of