Cellulose-graphene porous composite aerogel and preparation method thereof

A composite aerogel and graphene technology, applied in aerogel preparation, chemical instruments and methods, colloidal chemistry, etc., can solve problems such as graphene cannot be uniformly distributed, and physical strength cannot be further improved.

Active Publication Date: 2021-11-09
吴玉晓 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies that the overall physical strength of the product cannot be further improved due to the inability of graphene to be evenly distributed in the matrix during the actual preparation process of the existing cellulose-graphene composite functional materials, and to provide a A kind of cellulose-graphene porous composite airgel and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] After mixing graphene oxide with a particle size distribution range of 5-20nm and deionized water at a mass ratio of 1:8, ultrasonically disperse for 10 minutes at an ultrasonic frequency of 55kHz to form a graphene oxide aqueous solution, and then add graphene oxide Add 0.3% glycerin of graphene oxide aqueous solution mass to the aqueous solution, and ethylene glycol of 0.3% graphene oxide aqueous solution mass, after continuing ultrasonic dispersion for 10 minutes, a dispersion liquid is obtained, and then the obtained dispersion liquid is transferred to a spray dryer, and then The air temperature is 120°C, and the air outlet temperature is 90°C, and spray drying is performed to obtain pretreated graphene oxide;

[0033] After reducing the graphene oxide and ascorbic acid solution, sieve out the reduced graphene whose particle size distribution range is 100-500nm;

[0034] Pretreatment of cellulose: After mixing cellulose and sodium periodate solution with a mass frac...

Embodiment 2

[0039] After mixing graphene oxide with a particle size distribution range of 10-20nm and deionized water at a mass ratio of 1:9, ultrasonically disperse for 20 minutes at an ultrasonic frequency of 60kHz to form a graphene oxide aqueous solution, and then add graphene oxide Add 0.4% glycerin of graphene oxide aqueous solution mass to the aqueous solution, and ethylene glycol of 0.4% graphene oxide aqueous solution mass, after continuing to ultrasonically disperse for 15 minutes, a dispersion liquid is obtained, and then the obtained dispersion liquid is transferred to a spray drier for further The air temperature is 125°C, and the air outlet temperature is 95°C, and spray drying is performed to obtain pretreated graphene oxide;

[0040] After reducing the graphene oxide and ascorbic acid solution, sieve out the reduced graphene whose particle size distribution range is 400-500nm;

[0041] Pretreatment of cellulose: After mixing cellulose and sodium periodate solution with a m...

Embodiment 3

[0046] After mixing graphene oxide with a particle size distribution range of 5-20nm and deionized water at a mass ratio of 1:10, ultrasonically disperse for 40 minutes at an ultrasonic frequency of 65kHz to form a graphene oxide aqueous solution, and then add graphene oxide Add 0.5% glycerin by mass of graphene oxide aqueous solution and ethylene glycol with 0.5% mass of graphene oxide aqueous solution to the aqueous solution, and continue to ultrasonically disperse for 20 minutes to obtain a dispersion, then transfer the obtained dispersion to a spray dryer, and The air temperature is 140°C, and the air outlet temperature is 100°C, and spray drying is performed to obtain pretreated graphene oxide;

[0047] After reducing the graphene oxide and ascorbic acid solution, sieve out the reduced graphene whose particle size distribution range is 100-500nm;

[0048] Pretreatment of cellulose: After mixing cellulose and sodium periodate solution with a mass fraction of 10%, at a temp...

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Abstract

The invention belongs to the technical field of composite materials, and particularly relates to cellulose-graphene porous composite aerogel and a preparation method thereof. The product is prepared by the steps of: sequentially taking 80-100 parts by weight of cellulose, 0.5-1.5 parts by weight of graphene oxide with the particle size distribution range of 5-20 nm and 2-5 parts by weight of reduced graphene with the particle size distribution range of 100-500; dissolving the cellulose in an ionic liquid to obtain an ionic liquid solution of cellulose; adding the graphene oxide and the reduced graphene into the ionic liquid solution of cellulose, ultrasonically dispersing well, and dialyzing by using deionized water to remove the ionic liquid, so as to obtain composite hydrogel; and freeze-drying the obtained composite hydrogel to obtain the product. In the obtained product, the graphene material is uniformly dispersed, and a relatively good reinforcing effect can be achieved through a relatively small addition amount.

Description

technical field [0001] The invention belongs to the technical field of composite materials. More specifically, it relates to a cellulose-graphene porous composite airgel and a preparation method thereof. Background technique [0002] Cellulose airgel is a new type of polymer material prepared from cellulose. As a biomass-based airgel material, cellulose aerogel has the characteristics of high specific area and high porosity of traditional airgel materials, and also has its own special advantages, such as excellent biocompatibility and degradability. sex. These advantages make cellulose aerogels have broad research value and application prospects in the field of reinforcement and adsorption materials. Due to the hydrogen bonding between the cellulose molecular chains and the mechanical interweaving force, the porosity of pure cellulose aerogels cannot be further increased, and the internal microporous structure is easily destroyed when subjected to external pressure, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/04C08K3/04C08B15/02B01J13/00
CPCC08J9/28C08B15/02B01J13/0091C08J2205/026C08J2301/04C08K3/042C08J2201/0484
Inventor 闫子豪
Owner 吴玉晓
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