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Preparation method of cellulose composite aerogel

A composite aerogel and composite hydrogel technology, which is applied in the field of aerogel preparation, can solve the problems of low density, weak impact resistance, easy collapse, etc., and achieves a simple and controllable preparation method, good stability, and pollution. small effect

Inactive Publication Date: 2020-10-30
HOHAI UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to exert the mechanical properties and characteristics of cellulose airgel itself, its performance is often improved by modification, such as improving its compression resilience through high-temperature carbonization, or improving its mechanical properties by compounding rice materials, or chemical modification or direct contact. branches to improve its structural stability and mechanical properties, but the above methods can only improve the compression resistance of cellulose airgel to a certain extent, its texture is still soft, and it will still cause air condensation when facing external impact Damage or deformation of the glue, thereby affecting its performance or aesthetics
[0003] From the above, it can be concluded that the excellent performance of cellulose airgel comes from low density, large porosity and high specific surface area, but this also leads to its soft quality, low mechanical strength, weak impact resistance, and easy collapse under load. It is largely limited by the environment or site in practical application

Method used

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  • Preparation method of cellulose composite aerogel
  • Preparation method of cellulose composite aerogel
  • Preparation method of cellulose composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix 7g sodium hydroxide, 12g urea, and 81g water evenly, and cool down to -12°C, and completely dissolve 4g microcrystalline cellulose in sodium hydroxide-urea-water solution on a magnetic stirrer to obtain 4wt% of A cellulose solution, wherein the microcrystalline cellulose particle size is 50 μm;

[0022] (2) Take 50g of cellulose solution in a beaker, add 0.6g of N,N-methylenebisacrylamide MBA, stir for 3h until N,N-methylenebisacrylamide MBA is completely dissolved, and then according to the mass ratio of 2 : 0.2, add 0.2g dopamine hydrochloride DA and continue to stir for 12h, divide the mixed solution into 10ml beakers with 5ml each, seal and place in a 90°C oven for 12h to obtain cellulose composite hydrogel;

[0023] (3) Freeze the cellulose composite hydrogel at -15°C for 5 hours, and then dry it in a drier for 12 hours to obtain a preliminary cellulose composite aerogel. Wash to remove impurities, then perform solvent replacement with tert-butanol aqueous...

Embodiment 2

[0025] The difference between this embodiment and Example 1 is: when preparing cellulose composite hydrogel, use 40g cellulose solution, 0.4g N,N-methylenebisacrylamide MBA and 0.1g dopamine hydrochloride DA, oven temperature is 60°C.

Embodiment 3

[0027] (1) 7g sodium hydroxide, 12g urea, and 81g water were mixed uniformly, and cooled to -12°C, and 2g microcrystalline cellulose was completely dissolved in sodium hydroxide-urea-water solution on a magnetic stirrer to obtain 2wt% of Cellulose solution, the particle size of crystalline cellulose is 40 μm;

[0028] (2) Take 50g of cellulose solution in a beaker, add 0.3g of N,N-methylenebisacrylamide MBA, stir for 2h until the N,N-methylenebisacrylamide MBA is completely dissolved, then add 0.15g of hydrochloric acid Dopamine DA continued to stir for 12 hours, and the mixed solution was divided into 10ml beakers with 5ml each, sealed and placed in an oven at 100°C for 12h to obtain a cellulose composite hydrogel;

[0029] (3) Freeze the cellulose composite hydrogel at -15°C for 5 hours, and then dry it in a drier for 12 hours to obtain a preliminary cellulose composite aerogel. Wash to remove impurities, then perform solvent replacement with tert-butanol aqueous solution, ...

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Abstract

The invention discloses a preparation method of cellulose composite aerogel. The preparation method comprises the following steps: (1) preparing a cellulose solution, (2) sequentially adding N, N-methylene bisacrylamide and dopamine hydrochloride into the cellulose solution, and putting the mixture into an oven for reaction to prepare cellulose composite hydrogel, and (3) carrying out primary freeze drying, solvent replacement and secondary freeze drying on the cellulose composite hydrogel to obtain the cellulose composite aerogel. The cellulose composite aerogel prepared by the preparation method is good in structural stability, has impact resistance, and is simple and controllable in preparation method, low in pollution and low in cost.

Description

technical field [0001] The invention relates to a preparation method of an airgel, more particularly, to a preparation method of a cellulose composite airgel. Background technique [0002] Airgel materials have broad application prospects in many fields such as building energy conservation, new energy, chemical engineering, and aerospace. Traditional airgel is an inorganic aerogel represented by silica, but because of its low strength, The disadvantages such as poor toughness and fragility limit its application; the subsequent organic aerogels represented by resorcinol / formaldehyde and melamine / formaldehyde condensation polymers have defects of poor thermal stability, and the natural material cellulose The cellulose airgel derived from the development has the characteristics of traditional airgel nanoporous structure, and also has the advantages of green regeneration, good biocompatibility, good toughness, and easy processing. Shielding and other fields have broad applicati...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/075C08L51/02C08F251/02C08F222/38
CPCC08F251/02C08J3/075C08J9/28C08J2201/0502C08J2201/0504C08J2205/026C08J2351/02C08F222/385
Inventor 张建峰张天蒙
Owner HOHAI UNIV
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