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High-electric-conductivity and high-heat-conductivity bacterial cellulose/graphene composite paper and preparation method thereof

A composite technology of bacterial cellulose and graphene, applied in the field of electrical and thermal conductivity functional paper, can solve the problems of inability to precisely control the performance of composite paper, and the inability to determine the growth amount of graphene, and achieve good mechanical properties, reduced energy consumption, and high content. Effect

Inactive Publication Date: 2021-11-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can make graphene grow evenly in the bacterial cellulose network fiber structure, but the disadvantage is that the growth amount of graphene cannot be determined, and the performance of composite paper cannot be precisely controlled

Method used

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  • High-electric-conductivity and high-heat-conductivity bacterial cellulose/graphene composite paper and preparation method thereof
  • High-electric-conductivity and high-heat-conductivity bacterial cellulose/graphene composite paper and preparation method thereof
  • High-electric-conductivity and high-heat-conductivity bacterial cellulose/graphene composite paper and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Bacterial cellulose is secreted by the bacteria Gluconacetobacter. The main components of the bacterial culture medium are: ultrapure water 250mL, sucrose 5g, ammonium sulfate 1.25g, magnesium sulfate 0.125g, potassium dihydrogen phosphate 0.05g, sodium acetate trihydrate 1.24g, citric acid 0.25g, mannitol 0.5g, Disodium hydrogen phosphate dodecahydrate 0.063g, adjust the pH value to 4.5 with acetic acid, and sterilize at 100°C for 30min. A static fermentation culture method is adopted, the culture medium is placed in a container, inoculated with 8% (V / V) gluconacetobacter, and the temperature is 30° C. for static culture for 7 days. The obtained bacterial cellulose wet film had a solid content of 1.5 wt%.

[0043]Take 200g of bacterial cellulose wet film with a solid content of 1.5wt%, place it in an oven and dry it at 60°C to dryness; take 3g of dry bacterial cellulose, cut it into pieces, and put it in 600g of ultrapure water, Soak for 1 h; use a standard pulp defl...

Embodiment 2

[0049] Take bacterial cellulose leftovers, put them in an oven at 60°C and dry them to dryness; take 3g of dry bacterial cellulose, cut them into pieces, soak them in 375g ultrapure water for 1.5h; use a standard pulp deflaker The bacterial cellulose was dispersed to obtain a uniformly dispersed bacterial cellulose dispersion with a concentration of 0.8 wt%.

[0050] Get 250g bacterial cellulose dispersion, add 15g graphene dispersion (concentration is 10wt%), 35mg anionic starch (Hangzhou Paper Friends Technology Co., Ltd., model is YZ-171), 120mg gamma-polyglutamic acid, 40mg phthalate di-n-butyl formate, stirred for 1 hour, and ultrasonically treated for half an hour to obtain a mixed dispersion.

[0051] Put the polyethylene (PE) film as the substrate on the scraper coating machine, take 60g of the prepared mixed dispersion and transfer it to the PE film, adjust the height of the scraper to 1.6mm, and the forward speed to 1.5m / min, push the scraper, and the bacteria fiber ...

Embodiment 3

[0055] Bacterial cellulose is secreted by the bacteria Gluconacetobacter. The main components of the bacterial culture medium are: ultrapure water 250mL, sucrose 5g, ammonium sulfate 1.25g, magnesium sulfate 0.125g, potassium dihydrogen phosphate 0.05g, sodium acetate trihydrate 1.24g, citric acid 0.25g, mannitol 0.5g, Disodium hydrogen phosphate dodecahydrate 0.063g, adjust the pH value to 4.5 with acetic acid, and sterilize at 100°C for 30min. Adopt static fermentation culture method, culture medium is placed in container, inoculate 8% (V / V) gluconacetobacter, temperature is 30 DEG C and cultivate statically for 7 days, the bacterial cellulose wet film solid content that obtains is 1.5wt% .

[0056] Take 200 g of bacterial cellulose wet film with a solid content of 1.5 wt%, and place it in an oven at 60° C. to dry to absolute dryness. Take 3 g of absolutely dry bacterial cellulose, cut it into pieces, soak it in 500 g of ultrapure water for 0.5 h, use a standard pulp disin...

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Abstract

The invention belongs to the technical field of electricity-conducting and heat-conducting bacterial cellulose paper, and discloses high-electric-conductivity and high-heat-conductivity bacterial cellulose / graphene composite paper and a preparation method thereof. The method comprises the steps of 1) dispersing bacterial cellulose in water for pulping, and uniformly mixing the slurry with a graphene dispersion liquid, a dispersing agent, a thickening agent and a plasticizer to obtain composite slurry; 2) coating the composite slurry, and drying to obtain composite paper; and 3) soaking the composite paper in a mixed solution of water-soluble calcium salt and dilute nitric acid, cleaning, drying and hot-pressing to obtain the bacterial cellulose / graphene composite paper. The method disclosed by the invention is simple and low in cost, and complete adhesion of graphene and controllable doping amount can be realized; the highest electric conductivity of the prepared composite paper can reach 54644.81 S / m, the highest through-surface heat conductivity can reach 2.846 W / mk, and the highest plane heat conductivity can reach 42.597 W / mk; and the composite paper provided by the invention has good mechanical properties and can be bent and folded.

Description

technical field [0001] The invention belongs to the technical field of conductive and thermally conductive functional paper, and in particular relates to a highly conductive and high thermally conductive bacterial cellulose / graphene composite paper and a preparation method thereof. Background technique [0002] Bacterial cellulose is a special kind of cellulose, which is synthesized in vitro by microorganisms such as Acetobacter xylinum, so it is also called microbial cellulose. The microstructure of bacterial cellulose is composed of interweaving ultrafine cellulose nanofibers with a diameter of less than 100 nm, forming a nanofiber network. Such a structure makes bacterial cellulose easy to adsorb, disperse and load other nano functional particles. In addition, bacterial cellulose has high strength, high crystallinity and good hydrophilic properties, and can bind water 60 to 700 times heavier than its dry weight. Special paper made from bacterial cellulose has been succe...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J7/12C08L1/02C08L33/26C08L5/04C08L77/04C08L3/04C08L71/02C08L5/06C08K3/04
CPCC08J5/18C08J7/12C08J2301/02C08J2433/26C08J2405/04C08J2477/04C08J2403/04C08J2471/02C08J2405/06C08K3/042C08K2201/001
Inventor 王小慧凌浩
Owner SOUTH CHINA UNIV OF TECH
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