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A kind of preparation method of cellulose-chitosan/pani composite airgel

A technology of composite aerogel and chitosan, applied in aerogel preparation, chemical instruments and methods, colloidal chemistry, etc., can solve the problems of use and cannot be used as infrared stealth materials, etc. wave properties, the effect of increasing the interface polarization effect

Active Publication Date: 2022-04-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional metal-based absorbing materials have high infrared emissivity and cannot be used as infrared stealth materials

Method used

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  • A kind of preparation method of cellulose-chitosan/pani composite airgel
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  • A kind of preparation method of cellulose-chitosan/pani composite airgel

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Embodiment 1

[0032] A kind of preparation method of cellulose / PANI compound, comprises the steps:

[0033] Step 1, disperse cellulose: Dissolve 500mg of hydroxymethylcellulose into 50mL of water, and stir at a high speed of 2400r / min for 2h to obtain a transparent and viscous fluid;

[0034] Step 2, add dropwise 120.7mL of dilute aniline hydrochloric acid solution with a concentration of 0.1M to the fluid in step 1 (the concentration of the solvent-dilute hydrochloric acid solution is 1M), and stir at high speed for 2h;

[0035] Step 3, add dropwise 120.7mL of dilute hydrochloric acid solution containing ammonium persulfate to the solution of step 2 under ice bath conditions at 0°C (in the dilute hydrochloric acid solution containing ammonium persulfate, the concentration of ammonium persulfate is 0.1M, and the solvent- The concentration of the dilute hydrochloric acid solution is 1M) to carry out in-situ polymerization reaction, the colloidal substance obtained after the reaction is centr...

Embodiment 2

[0038] The preparation method of cellulose-chitosan / PANI composite airgel of the present invention comprises the steps:

[0039] Step 1, disperse cellulose: Dissolve 500mg of hydroxymethylcellulose into 50mL of water, and stir at a high speed of 2400r / min for 2h to obtain a transparent and viscous fluid;

[0040] Step 2, add chitosan to the fluid in step 1 according to the mass ratio of 1:1, and continue high-speed stirring for 2 hours at a speed of 2400r / min until the chitosan is completely dissolved, and the obtained solution is slightly yellow;

[0041] Step 3, add 120.7 mL of aniline-containing dilute hydrochloric acid solution dropwise to the solution in step 2 (in the aniline-containing dilute hydrochloric acid solution, the concentration of aniline is 0.1M, and the concentration of the solvent-dilute hydrochloric acid solution is 1M), and stir at high speed for 2 hours;

[0042] Step 4, add dropwise 120.7mL of dilute hydrochloric acid solution containing ammonium persul...

Embodiment 3

[0045] In embodiment 3, only step 2 adds chitosan in step 1 fluid according to mass ratio 1: 2 (in the cellulose-chitosan solution that obtains, the mass ratio of cellulose and chitosan is 1: 2 ), and the rest of the steps remain unchanged.

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Abstract

The invention discloses a preparation method of cellulose-chitosan / PANI composite airgel. The method is as follows: first stirring to obtain a cellulose-chitosan solution, and then in-situ polymerization on the fiber under ice-bath conditions Conductive polymer particles are grown on the surface of the cellulose-chitosan substrate, and finally freeze-dried to prepare an airgel material; wherein, in the cellulose-chitosan solution, the mixing mass ratio of cellulose to chitosan is 1 : 1 to 1: 2; the conductive polymer particles are PANI particles. The preparation method of the invention can obtain an airgel material with good wave-absorbing performance and low infrared emissivity.

Description

technical field [0001] The invention relates to an airgel material having both infrared and wave-absorbing properties, in particular to a preparation method of a cellulose-chitosan / PANI composite airgel, which belongs to the technical field of airgel materials. Background technique [0002] The rapid development of modern computers and various electronic communication technologies has brought great convenience and comfort to human life, but at the same time it has also brought serious electromagnetic radiation. Electromagnetic radiation will not only endanger your health but also seriously interfere with the normal work of electronic products. At present, coating electronic products with high-efficiency absorbing materials can reduce the interference of electromagnetic radiation on instruments and equipment, and keep the human body in a safe radiation range. It is considered to be one of the effective methods to control pollution. In addition, in the military field, the exi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00C08L1/02C08L5/08C08L79/02C08J9/28
CPCB01J13/0091C08J9/28C08J2301/02C08J2305/08C08J2479/02C08J2205/026
Inventor 姬广斌张铸顾未华赵越
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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