Organic aerogel as well as preparation method and application of organic aerogel

An airgel and organic technology, applied in the field of flexible organic aerogel and its preparation, can solve the problems of low efficiency and achieve the effects of good flexibility, simple and efficient preparation process, and good flexibility

Active Publication Date: 2017-06-13
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method requires the process of gel modification, solvent exchange and monomer diffusion, and the preparation takes several weeks and is inefficient.

Method used

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  • Organic aerogel as well as preparation method and application of organic aerogel
  • Organic aerogel as well as preparation method and application of organic aerogel
  • Organic aerogel as well as preparation method and application of organic aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 3,6-dioxo-1,8-octanedithiol and triallyl isocyanurate with a molar ratio of mercapto to vinyl of 1:0.5 in acetamide solvent, and the mass concentration of the solute is 200g / L ; Add 3% initiator azobisisobutyronitrile to the solution and stir evenly, then let it stand to obtain a gel; soak the gel in acetone at 30°C for 24h; then dry it at 80°C for 24h , to obtain flexible organic aerogels.

[0031] The density of the flexible airgel prepared in Example 1 is 0.25g cm -3 , the pore size distribution is 2-50nm, and the BET specific surface area is 800m 2 g -1 , the thermal conductivity is 0.04W·m -1 k -1 , the light transmittance is 89.5%, it can be compressed to 65% of its own volume, the bending angle reaches 150°, the compressive modulus is 1.5MPa, and the bending modulus is 0.5MPa; its appearance schematic diagram is as follows figure 1 As shown, the letters on the paper can be clearly seen from the figure, so it can be concluded that the airgel has good ligh...

Embodiment 2

[0033] Mix toluene-3,4-dithiol and trimethylolpropane triacrylate with mercapto and vinyl molar ratio of 1:1 in formamide solvent, the mass concentration of solute is 50g / L; add in the solution After stirring evenly with 0.5% initiator cumene hydrogen peroxide, the gel was obtained by standing still; the gel was soaked and aged in acetone at 50° C. for 12 hours; then vacuum freeze-dried for 24 hours to obtain a flexible organic airgel.

[0034] The density of the flexible airgel prepared in Example 2 is 0.08g cm -3, the pore size distribution is 2-250nm, and the BET specific surface area is 400m 2 g -1 , the thermal conductivity is 0.02W·m -1 k -1 , the light transmittance is 0%, it can be compressed to 70% of its own volume, the bending angle reaches 180°, the compressive modulus is 0.7MPa, and the bending modulus is 0.1MPa.

Embodiment 3

[0036] Mix pentaerythritol tetramercaptopropionate and triallyl isocyanurate with a molar ratio of mercapto and vinyl groups of 1:1 in a methanol solvent with a solute mass concentration of 10 g / L; heat the solution to 70°C for 10 hours Initiate polymerization to obtain a gel; soak and age the gel in isopropanol at 50°C for 24 hours; then supercritical CO 2 After drying for 24 hours, a flexible organic airgel was obtained.

[0037] The density of the flexible airgel prepared in Example 3 is 0.05g cm -3 , the pore size distribution is 2-50nm, and the BET specific surface area is 1000m 2 g -1 , with a thermal conductivity of 0.01W·m -1 k -1 , the light transmittance is 99.9%, it can be compressed to 80% of its own volume, the bending angle reaches 180°, the compressive modulus is 0.01MPa, and the bending modulus is 0.01MPa; its appearance schematic diagram is as follows figure 2 As shown, it can be seen from the figure that the aerogel can be knotted, indicating that the a...

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Abstract

The invention discloses organic aerogel as well as a preparation method and application of the organic aerogel. The organic aerogel is mainly prepared by dissolving an organic monomer or low polymer containing multiple sulfydryl groups and an organic monomer or low polymer containing multiple vinyl groups into an alcohol, ketone, amide, sulfoxide, furan, nitrile or benzene organic solvent in the molar ratio of the sulfydryl groups to the vinyl groups being 1:(0.5-3). The organic aerogel is cross-linked through a C-S bond of a low internal rotation barrier to form a three-dimensional network structure; the aerogel is endowed with good flexibility, has good blocking property, a porous structure, high specific surface area, low heat conductivity and adjustable light transmission, and can be applied to different occasions. By adopting efficient thiol-ene click reaction, the preparation process is simple, efficient, short in cycle and free of subsequent modification step; the prepared organic aerogel can be applied to the fields of building energy conservation, petrochemical engineering or sewage treatment.

Description

technical field [0001] The invention relates to chemical materials, in particular to a flexible organic airgel and its preparation method and application. Background technique [0002] 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 (200-1000m 2 g -1 ), low thermal conductivity (~0.02W·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, the most reported silica aerogels have not been widely used, mainly because silica aerogels form secondary spherical particles in the form of chain beads by weakly strained Si-O-Si bonds. The connection forms a three-dimensional network structure, which causes the airgel to be easily broken and broken under the action of external force, the structure collapses, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08G75/045C08L81/02
CPCC08G75/045C08J9/28C08J2201/0502C08J2205/026C08J2205/04C08J2205/042C08J2205/044C08J2205/06C08J2381/02
Inventor 云山郭探李彦兴朱秀芳李华举张加栋洪坤何磊陈静
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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