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Double-crosslinking-network silicon-based aerogel and preparation method thereof

An aerogel and double-crosslinking technology, which is applied in the field of double-crosslinked network silicon-based aerogel and its preparation, can solve the problems of easy fragmentation and powder loss, and achieve the solution of brittleness and easy fragmentation and improve mechanical properties. Effect

Inactive Publication Date: 2019-03-19
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the present invention provides a double-crosslinked network silicon-based aerogel, whose unique -C-C- and Si-O-Si double-crosslinked network structure improves the mechanical properties of the aerogel and solves the problem of The defects of traditional silicon-based aerogels due to brittleness, brittleness and powder drop; the invention also provides a preparation method of double-crosslinked network silicon-based aerogels, which is simple in process, high in efficiency, and suitable for large-scale application

Method used

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  • Double-crosslinking-network silicon-based aerogel and preparation method thereof
  • Double-crosslinking-network silicon-based aerogel and preparation method thereof
  • Double-crosslinking-network silicon-based aerogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Dissolving isoprene and vinyltriethoxysilane in methanol solvent to obtain a mixed solution, adding initiator benzoyl peroxide to the mixed solution and heating to 40°C to obtain a cross-linked gel containing C-C bonds; Immerse in ammonia water with a pH value of 8 for 0.5h to obtain a double-crosslinked gel containing C-C bonds and Si-O-Si bonds. The gel was aged and gelled in methanol solvent for 8 h and then dried to obtain a gel containing C-C bonds and Si-O-Si bonds. -O-Si bond double cross-linked silicon-based airgel, wherein the molar ratio of isoprene, vinyltriethoxysilane, methanol, and initiator is 1:10:100:0.1.

[0031] The prepared double-crosslinked silicon-based airgel has a density of 0.05 g cm -3 , the pore size distribution measured by nitrogen adsorption method is 2~1000 nm, and the BET specific surface area is as high as 800 m 2 g -1 , the thermal conductivity measured by the planar heat source method is 0.02 W·m -1 k -1 , the compressive modulus ...

Embodiment 2

[0033] Dissolving isoprene and vinyltriethoxysilane in methanol solvent to obtain a mixed solution, adding initiator benzoyl peroxide to the mixed solution and heating to 60°C to obtain a cross-linked gel containing C-C bonds; Immersed in urea aqueous solution with a pH value of 10 for 12 h to obtain a double-crosslinked gel containing C-C bonds and Si-O-Si bonds, aged and gelled the gel in ethanol solvent for 48 h, and then dried to obtain Si-O-Si double-crosslinked silicon-based airgel, wherein the molar ratio of isoprene, vinyltriethoxysilane, methanol, and benzoyl peroxide is 1:10:10:1.

[0034] The prepared double-crosslinked silicon-based airgel has a density of 0.55 g cm -3 , the pore size distribution measured by nitrogen adsorption method is 2~100 nm, and the BET specific surface area is as high as 100 m2 g -1 , the thermal conductivity measured by the planar heat source method is 0.06 W·m -1 k -1 , the compressive modulus is 15 MPa, the flexural modulus is 1 MPa, ...

Embodiment 3

[0036] Will N, N' - Methylenebisacrylamide and vinyltrimethoxysilane dissolved in N, N' - Obtain a mixed solution in dimethylformamide solvent, add initiator azobisisobutyronitrile to the mixed solution and heat to 80°C to obtain a cross-linked gel containing C-C bonds; immerse the gel in potassium hydroxide with a pH value of 13 In the aqueous solution for 2 h, a double-crosslinked gel containing C-C bonds and Si-O-Si bonds was obtained. The gel was aged and gelled in isopropanol for 24 h, and then dried to obtain a gel containing C-C bonds and Si-O-Si bonds. Double-crosslinked silicon-based aerogels, in which N, N' -Methylenebisacrylamide, Vinyltrimethoxysilane, N, N' - The molar ratio of dimethylformamide and azobisisobutyronitrile is 1:50:100:0.5.

[0037] The prepared double-crosslinked silicon-based airgel has a density of 0.25 g cm -3 , the pore size distribution measured by nitrogen adsorption method is 2~400 nm, and the BET specific surface area is as high as ...

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Abstract

The invention discloses double-crosslinking-network silicon-based aerogel. The aerogel has -C-C and Si-O-Si dual crosslinking bonds; and the pore diameter distribution is 2 to 1000nm, the BET specificsurface area reaches 100 to 800m<2>.g<-1>, the density is 0.05 to 0.55g.cm<-3>, the heat conductivity is 0.015 to 0.06W.m<-1>.K<-1>, the compression modulus is 0.8 to 15MPa, the bending modulus is 0.1 to 1MPa and the contact angle is 120 to 170 degrees. A preparation method of the double-crosslinking-network silicon-based aerogel comprises the following steps: firstly, dissolving an organic monomer containing two or more than two -C=C- and silane containing the -C=C- into a solvent; carrying out polymerization reaction to obtain -C=C- cross-linked gel; then immersing the gel into an alkalinewater solution to further obtain Si-O-Si bonded cross-linked gel; and drying the gel containing the -C-C and Si-O-Si dual crosslinking bonds to obtain the corresponding double-crosslinking-network silicon-based aerogel. The double-crosslinking-network silicon-based aerogel prepared by the invention has the advantages of good blocking performance, high strength, low heat conductivity and good hydrophobic performance and can be applied to fields including building energy saving, petrochemical industry, sewage treatment and the like.

Description

technical field [0001] The invention belongs to the field of preparation of nanoporous materials, in particular to a double-crosslinked network silicon-based airgel and a preparation method thereof. Background technique [0002] Silica airgel is a new material with a three-dimensional nanoporous structure, which has a low density (0.003~0.8g cm -3 ), high porosity (80~99.8%), high specific surface area (200~1000 m 2 g -1 ), low thermal conductivity (~0.02 W m -1 K -1 ) and other properties, it has very broad prospects in aerospace, chemical industry, energy-saving buildings, military, communications, electronics, metallurgy and other application fields. However, silica airgel has not been widely used, mainly because the network structure of silica airgel is a three-dimensional network structure formed by simple rigid Si-O-Si bond cross-linking. It is easy to break and break, and the structure collapses, resulting in poor mechanical properties. [0003] US patents US707...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/24C08F230/08C08F236/08C08F222/38C08F226/06C08F222/14C08L43/04
CPCC08F230/08C08J3/24C08J9/28C08J2343/04C08F222/102C08F236/08C08F226/06C08F222/385
Inventor 李彦兴云山郭探张加栋李华举
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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