A kind of preparation method of graphene-silica airgel

A silica and graphene technology, applied in graphene, ceramic products, other household appliances, etc., can solve the problems of poor mechanical properties and high brittleness of silica aerogel, and achieve good mechanical properties and good skeleton structure. , the effect of saving time

Active Publication Date: 2020-06-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: the present invention solves the problem of brittle silica airgel and poor mechanical properties, and utilizes the low density and good blockability of graphene airgel to prepare composite airgel thermal insulation materials

Method used

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  • A kind of preparation method of graphene-silica airgel
  • A kind of preparation method of graphene-silica airgel
  • A kind of preparation method of graphene-silica airgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a. Synthesis of graphite oxide

[0034] In an ice-water bath, pour 21ml of 98% concentrated sulfuric acid into the flask, then pour 1g of natural graphite and 0.5g of sodium nitrate into a 250ml round-bottomed flask with ultrasonic stirring for 45min; magnetically stir for 30min, and weigh 3g of high Potassium manganate was slowly added to the flask, and stirring was continued for 45 minutes. Transfer the flask to another water bath, raise the temperature to 35°C, continue stirring for 30 minutes, measure 23ml of distilled water and slowly add it to the flask, then transfer to an oil bath at 98°C and continue stirring for 15 minutes, and finally add 140ml of distilled water and 20mL 30% hydrogen peroxide. The final mixture was bright yellow. The product was centrifuged and washed with 500 mL of 5% hydrochloric acid and distilled water until nearly neutral. The final product was dried in a vacuum oven at 60 °C for 24 h, and the obtained brown flake product was graphit...

Embodiment 2

[0048] a. Synthesis of graphite oxide

[0049] In an ice-water bath, pour 22ml of 98% concentrated sulfuric acid into the flask, then pour 1g of natural graphite and 0.5g of sodium nitrate into a 250ml round bottom flask and stir ultrasonically for 50min; stir magnetically for 45min, and weigh 3g of high Potassium manganate was slowly added to the flask, and stirring was continued for 60 minutes. Transfer the flask to another water bath, raise the temperature to 35°C, continue stirring for 35 minutes, measure 25ml of distilled water and slowly add it to the flask, then transfer to an oil bath at 98°C and continue stirring for 15 minutes, and finally add 140ml of distilled water and 20mL 30% hydrogen peroxide, the product was centrifuged and washed with 500mL 3% dilute hydrochloric acid and distilled water until nearly neutral. The final product was dried in a vacuum oven at 60 °C for 24 h, and the obtained brown flake product was graphite oxide GO.

[0050] b Preparation of ...

Embodiment 3

[0063] a. Synthesis of graphite oxide

[0064] In an ice-water bath, pour 21ml of 98% concentrated sulfuric acid into the flask, then pour 1g of natural graphite and 0.5g of sodium nitrate into a 250ml round-bottomed flask with ultrasonic stirring for 45min; magnetically stir for 30min, and weigh 3g of high Potassium manganate was slowly added to the flask, and the stirring was continued for 45min-60min. Transfer the flask to another water bath, raise the temperature to 35°C, continue stirring for 30 minutes, measure 23ml of distilled water and slowly add it to the flask, then transfer to an oil bath at 98°C and continue stirring for 15 minutes, and finally add 140ml of distilled water and 20mL of 30 % hydrogen peroxide. The final mixture was bright yellow. The product was centrifuged and washed with 500 mL of 5% hydrochloric acid and distilled water until nearly neutral. The final product was dried in a vacuum oven at 60 °C for 24 h, and the obtained brown flake product wa...

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Abstract

The invention provides a preparation method for a graphene-silicon dioxide aerogel. The compound aerogel is prepared from silicon dioxide aerogel, graphene aerogel and chitosan. According to the method provided by the invention, the characteristic of low heat conductivity coefficient of the silicon dioxide aerogel, the low density and high strength of the graphene aerogel and the cementing action of chitosan are utilized, and a freeze-drying manner is adopted for preparing the graphene-silicon dioxide aerogel material. The composite material prepared according to the method can keep an excellent heat insulation property and mechanical properties at medium and low temperatures and can greatly solve the problems of high brittleness and poor mechanical properties of single SiO2 aerogel; the density is lower and can reach up to 96mg / cm<3>; the technology is simple, the operability is high, and the cost is relatively low; and the graphene-silicon dioxide aerogel has the characteristics of the two materials, namely, the SiO2 aerogel and the graphene aerogel.

Description

technical field [0001] The invention relates to a novel composite airgel heat insulating material and a preparation method thereof, in particular to a preparation method of graphene-silicon dioxide airgel. Background technique [0002] Silica airgel is an ultra-light porous condensed matter with a three-dimensional network structure that uses gas as a dispersion medium. Silica airgel has the advantages of stable chemical properties, large specific surface area, low density and high porosity, so airgel has been active in the fields of heat insulation, sound insulation, adsorption and catalysis. In the field of thermal insulation, silica aerogel is currently the most researched. However, the poor mechanical properties and high brittleness of silica aerogels are the key problems that make it difficult for aerogels to be applied. People mainly solve this problem in two ways: (1) adding polymers to the skeleton of SiO2 airgel by in situ reaction or soaking; (2) reinforcing by c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B26/28C01B32/19
CPCC04B26/28C04B38/0045C04B2201/20C04B2201/32C04B2201/50C04B38/0067C04B38/0054C04B14/024C04B14/064
Inventor 贺伟
Owner SOUTHEAST UNIV
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