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A kind of intrinsically hydrophobic polyimide airgel, its preparation method and application

A water polyimide and polyimide technology, applied in the field of intrinsically hydrophobic polyimide airgel, can solve the problems of decreased hydrophobic performance, complicated preparation process and high cost, and unsuitability for large-scale industrial production

Active Publication Date: 2020-06-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these crosslinkers or fillers are generally very expensive or non-commercial
On the other hand, adding these crosslinking agents or fillers complicates the preparation process, and inevitably reduces the hydrophobicity, making it difficult to simultaneously ensure the mechanical properties, hydrophobicity, flux and other properties of polyimide aerogels.
[0007] The existing preparation of polyimide aerogels usually requires a cumbersome solvent replacement process and supercritical drying and chemical imidization, which not only causes a large amount of waste of organic solvents, but also has a complicated preparation process and high cost, which is not suitable for large-scale industrialization. Production

Method used

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  • A kind of intrinsically hydrophobic polyimide airgel, its preparation method and application
  • A kind of intrinsically hydrophobic polyimide airgel, its preparation method and application
  • A kind of intrinsically hydrophobic polyimide airgel, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A preparation method of intrinsically hydrophobic polyimide airgel, comprising the following steps:

[0060] The preparation steps of polyamic acid salt solution:

[0061] Under an inert atmosphere (nitrogen), mix 39.16 g of dimethylacetamide with 2.24 g of 2-(4-aminophenyl)-5-aminobenzimidazole, then add 2.94 g of 3,3',4,4' - Biphenyltetracarboxylic dianhydride, stirred and reacted at 0°C for 8 hours to obtain a brown polyamic acid solution;

[0062] Mix the brown polyamic acid solution with 2.02g triethylamine and stir for 1 hour to obtain a white polyamic acid salt suspension, then add 1.67g deionized water to the suspension to obtain a brown viscous polyamic acid salt suspension .

[0063] It should be noted that, since the suspension of polyamic acid salt will be obtained after adding triethylamine, the polyamic acid salt can be dissolved after adding deionized water to obtain a uniform glue, which is beneficial to the polyamic acid salt in acetone. Precipitated...

Embodiment 2

[0074] This embodiment provides a preparation method of intrinsically hydrophobic polyimide airgel, which is roughly the same as the preparation method provided in Example 1, except that the parameters are different, and it includes the following steps:

[0075] The preparation steps of polyamic acid salt solution:

[0076] Under an inert atmosphere (nitrogen), mix 39.16g of N,N-dimethylformamide with 2.24g of 2-(4-aminophenyl)-5-aminobenzimidazole, then add 2.94g of 3,3', 4,4'-Biphenyltetracarboxylic dianhydride was stirred and reacted at 0°C for 8 hours to obtain a brown polyamic acid solution;

[0077] Mix the brown polyamic acid solution with 2.02g triethylamine and stir for 1 hour to obtain a white polyamic acid salt suspension, then add 1.70g deionized water to the suspension to obtain a brown viscous polyamic acid salt suspension .

[0078] Preparation steps of polyamic acid salt powder:

[0079] The polyamic acid salt solution obtained in the above steps was mixed w...

Embodiment 3

[0085] This embodiment provides a preparation method of intrinsically hydrophobic polyimide airgel, which is roughly the same as the preparation method provided in Examples 1-2, the difference lies in the different parameters, which includes the following steps:

[0086] The preparation steps of polyamic acid salt solution:

[0087] Under an inert atmosphere (nitrogen), mix 39.16g of N-methylpyrrolidone with 1.12g of 2-(4-aminophenyl)-5-aminobenzimidazole, 1.00g of 4,4'-diaminodiphenyl ether, Then 2.94g of 3,3',4,4'-biphenyltetracarboxylic dianhydride was added, stirred and reacted at 0°C for 8h to obtain a brown polyamic acid solution;

[0088] Mix the brown polyamic acid solution with 2.02g triethylamine and stir for 1 hour to obtain a white polyamic acid salt suspension, then add 1.52g deionized water to the suspension to obtain a brown viscous polyamic acid salt suspension .

[0089] Preparation steps of polyamic acid salt powder:

[0090] The polyamic acid salt solutio...

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Abstract

The invention discloses an intrinsically hydrophobic polyimide airgel, its preparation method and its application, and relates to the technical field of preparation of three-dimensional porous materials and its application in oil-water separation materials. The polyimide airgel In the preparation method, 2-(4-)-5-aminobenzimidazole containing a benzimidazole structure is introduced as a diamine, which is highly hydrophobic and can realize the separation of water-in-oil emulsion and oil-water separation in harsh environments. And it has high separation throughput, can be recycled for many times, and the preparation method is simple, which avoids the solvent replacement process and supercritical drying of the traditional polyimide airgel preparation. At the same time, the preparation process is green and environmentally friendly, and takes a short time. The prepared polyimide airgel can realize high-efficiency and high-rate oil-water separation under various extreme conditions.

Description

technical field [0001] The invention relates to the technical field of preparation of three-dimensional porous materials and their application in oil-water separation materials, in particular, to an intrinsically hydrophobic polyimide airgel, its preparation method and its application. Background technique [0002] Oil-water separation has become a global challenge due to the discharge of a large amount of industrial oily wastewater, domestic sewage, increasing seawater pollution, and frequent oil spill accidents. To solve this problem, membrane separation technology is usually adopted, but due to their small pore size (less than 0.3 μm), these separation membranes usually face the problems of high energy consumption, low flux and low separation efficiency due to pore clogging. [0003] Three-dimensional porous airgel has the characteristics of high porosity, low density and high specific area. In recent years, several functional aerogels such as silica aerogel, carbon nanot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J9/36C08J9/28B01J20/26B01J20/28B01J20/30B01D17/022C08L79/08
Inventor 秦家强王怡星刘向阳
Owner SICHUAN UNIV
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