Preparation method of high-electromagnetic-shielding-effectiveness full-biomass-based carbon aerogel

An electromagnetic shielding and biomass technology, applied in the field of all biomass-based carbon airgel preparation, can solve the problems of poor mechanical stability, toxic process, and complexity of carbon airgel, achieve excellent electromagnetic shielding performance, and the process is easy to master , the effect of good conductivity

Active Publication Date: 2019-04-12
SICHUAN UNIV
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Problems solved by technology

Although the above-mentioned carbon aerogels all exhibit excellent electromagnetic shielding performance, there are still the following problems: (1) the source of organic aerogel materials is highly dependent on petroleum resources; (2) the in-situ preparation of carbon aerogels by chemical vap

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  • Preparation method of high-electromagnetic-shielding-effectiveness full-biomass-based carbon aerogel
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  • Preparation method of high-electromagnetic-shielding-effectiveness full-biomass-based carbon aerogel

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Example

[0034] Examples 1-36 (see Table 1)

[0035] The preparation method of an all-biomass-based carbon aerogel with high electromagnetic shielding efficiency of the present invention uses the following raw materials and reagents:

[0036] Raw material: cellulose;

[0037] Reagents: lithium hydroxide, urea, tert-butanol, water;

[0038] The preparation method adopts the following steps:

[0039] (1) Raw material drying: fully dry the cellulose.

[0040] (2) Preparation of cellulose solution: at room temperature, add the dried cellulose in step (1) to a mixed solvent of lithium hydroxide, urea, and water, and stir until a stable and transparent cellulose solution is obtained; step

[0041] In (2), for example, the mass ratio of lithium hydroxide: urea: water can be 8:15:77; the temperature of the mixed solvent is better at low temperature, for example, the temperature can be -20.0℃, -10.0℃ or 0℃, see Table 1: Stirring can be vigorously stirred at 3000r / min, for example.

[0042] (3) Preparation ...

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Abstract

The invention discloses a preparation method of high-electromagnetic-shielding-effectiveness full-biomass-based carbon aerogel. The required raw materials comprise cellulose. The method comprises thefollowing steps of raw material drying, preparation of a cellulose solution, preparation of cellulose aerogel and preparation of carbon aerogel. According to the method, celluloses is used as a precursor, through dissolution regeneration, cosolvent treatment and freezing drying, a three-dimensional continuous opening sheet layered grid structure of the cellulose aerogel is regulated and controlled, the stable and excellent electric conduction network (592.3 S/m) is constructed through high-temperature carbonization, and the efficient electromagnetic shielding performance (106.3 dB) of the carbon aerogel is achieved. The carbon aerogel has a wide precursor source and is environmentally friendly, a solvent system is nontoxic and low in price, the material preparation process is simple, the technology is easy to control, the production cost is low, and the carbon aerogel has high potential of large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of all biomass-based carbon aerogels, in particular to a preparation method of cellulose-based carbon aerogels with high electromagnetic shielding efficiency. Background technique [0002] With the rapid development of electronic science and technology, electronic equipment is changing with each passing day, and it is widely used in military, industrial and civil fields. Human organs, tissues and systems produce different degrees of harm (D. Chung et al. Carbon, 2001, 39, 279.). Therefore, it is of great significance to develop an efficient electromagnetic shielding material to suppress the interference of electromagnetic radiation on electronic equipment and protect human beings from the harm of electromagnetic wave radiation. [0003] Polymer conductive composites (CPCs) are a new type of electromagnetic shielding material that has great application prospects and is expected to replace meta...

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Application Information

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IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 黄华东周子涵李忠明雷军钟淦基徐家壮鄢定祥
Owner SICHUAN UNIV
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