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A kind of polyimide airgel with lotus leaf effect and its preparation method and application

A technology of polyimide gel and polyimide, which is applied in the field of nanoporous materials and heat insulation, can solve the problems of low output, high porosity, low thermal conductivity, etc., and achieve huge application prospects and large specific surface area , the effect of low thermal conductivity

Active Publication Date: 2021-11-02
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyimide airgel is generally hydrophilic, that is, it can absorb a large amount of water, which will directly cause the pores of the airgel to be filled with liquid and lose various excellent properties, such as low thermal conductivity, high porosity, and low density. etc. For this reason, the hydrophobization of polyimide airgel has become a major key technology to be solved
The hydrophobization technology currently used includes the introduction of fluorinated groups or other hydrophobic inorganic nanoparticles. The former preparation method is expensive and the yield is low; the composite material formed by the latter suffers from loss of mechanical strength, radiation resistance, and low temperature resistance.

Method used

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  • A kind of polyimide airgel with lotus leaf effect and its preparation method and application
  • A kind of polyimide airgel with lotus leaf effect and its preparation method and application
  • A kind of polyimide airgel with lotus leaf effect and its preparation method and application

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preparation example Construction

[0042] Another aspect of the embodiments of the present invention also provides a method for preparing the aforementioned polyimide airgel with lotus leaf effect, which includes:

[0043]Mixing the first polyamic acid solution and the second polyamic acid solution uniformly to form a mixed system;

[0044] A chemical dehydrating agent is added to the mixed system, and then the polyimide gel is formed by standing still, and then aged, solvent replaced and dried to obtain the polyimide airgel with lotus leaf effect.

[0045] Further, the formation of the island structure in the polyimide airgel of the present invention depends on the reaction steps and the type of the first polyamic acid solution. Based on this, the island structure and the lotus leaf effect of the present invention can be obtained.

[0046] Preferably, the first polyamic acid is different from the second polyamic acid.

[0047] In some embodiments, the first polyamic acid solution includes the first polyamic ...

Embodiment 1

[0077] (1) Synthesis and compounding of polyamic acid: p-phenylenediamine and bisphenol A dianhydride condensed polyamic acid (mass concentration is 1%) in 1g N-methylpyrrolidone in synthetic repeating unit number; In N-methylpyrrolidone, the polyamic acid (mass concentration is 5%) of 4,4'-diaminodiphenyl ether and 4,4'-biphenyl ether dianhydride (mass concentration is 5%) with 100 repeating units; the above two The polyamic acid was mixed thoroughly, stirred for 10 minutes, and ultrasonicated for 5 minutes.

[0078] (2) Synthesis of polyimide gel: Add 25g of acetic anhydride / triethylamine (molar ratio: 1:1) mixture to the above polyamic acid mixture, stir rapidly for 10 minutes, and ultrasonically deaerate for 30 minutes. minute. Finally, the obtained solution was left standing at 10° C., and a polyimide gel was formed after 5 hours.

[0079] (3) Preparation of polyimide airgel with lotus leaf effect: put the above polyimide gel at 80°C for aging for 24 hours, then soak it...

Embodiment 2

[0081] (1) Synthesis and compounding of polyamic acid: p-phenylenediamine and bisphenol A dianhydride condensed polyamic acid (mass concentration is 5%) in 20g N-methylpyrrolidone in synthetic repeat unit number; The polyamic acid (mass concentration is 30%) of 9,9-bis(4-aminophenyl)fluorene and 4,4'-biphenyl ether dianhydride synthesized in N-methylpyrrolidone with 10 repeating units; The above two polyamic acids are fully mixed, stirred for 15 minutes, and ultrasonicated for 10 minutes.

[0082] (2) Synthesis of polyimide gel: 50 g of acetic anhydride / pyridine (1:1 molar ratio) mixture was added to the above polyamic acid mixture, stirred rapidly for 20 minutes, and ultrasonically degassed for 20 minutes. Finally, the obtained solution was left standing at 30° C., and a polyimide gel was formed after 3 hours.

[0083] (3) Preparation of polyimide airgel with lotus leaf effect: put the above polyimide gel at 60°C for aging for 24 hours, then soak it in 150g N-methylpyrrolido...

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Abstract

The invention discloses a polyimide airgel with lotus leaf effect, a preparation method and application thereof. The polyimide airgel with lotus leaf effect includes: a porous network skeleton composed of polyimide, and a plurality of polyimide island structures distributed in the porous network skeleton; and the The contact angle between the polyimide airgel and water is ≥150°. The preparation method includes: uniformly mixing the first polyamic acid solution and the second polyamic acid solution to form a mixed system, adding a chemical dehydrating agent to the mixed system, and then standing to form a polyimide gel, and then After aging, solvent replacement and drying, the polyimide airgel with lotus leaf effect was obtained. The polyimide airgel with lotus leaf effect of the present invention has superhydrophobicity, water resistance, high and low temperature resistance, large specific surface area, low density, low thermal conductivity and other properties, and has great application prospects.

Description

technical field [0001] The invention relates to a polyimide airgel and a preparation method thereof, in particular to a biomimetic structure, superhydrophobic polyimide airgel with a lotus leaf effect, a preparation method and application thereof, belonging to nanoporous Material and thermal insulation technical field. Background technique [0002] Airgel is a nanomaterial with a continuous and open pore structure. It is currently the lightest solid material with the best thermal insulation performance in the world. Airgel has a high specific surface area (400 ~ 1500m 2 / g), high porosity (80-99.8%), low density (0.003-0.6g / cm 3 ) and low thermal conductivity (0.013-0.038W / m·k), it has broad application prospects in the fields of heat insulation, acoustic impedance coupling, adsorption, filtration, catalyst carrier, drug carrier, etc. So far, industry researchers have prepared various types of aerogels by chemical crosslinking, including silica aerogels (CN105236929A; CN1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L79/08C08G73/10
CPCC08G73/1067C08J3/075C08J2379/08
Inventor 张学同王锦李鑫
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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