Preparation method of tough graphene/cellulose composite heat-conductive and electro-conductive film

A technology of conductive film and cellulose, which is applied in the field of nanomaterials and functional materials, can solve the problems of complex process, harsh conditions, and the decline of graphene's thermal and electrical conductivity, and achieve the effect of low preparation cost and simple operation

Inactive Publication Date: 2017-10-24
QILU UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the graphene film preparation is single-layer graphene. For example, the graphene film prepared by CVD method is mainly single-layer graphene. This method is limited by the disadvantages of complex process, harsh conditions, low yield and high cost. Large-scale industrial application of graphene
Another example is the use of chemical redox method to prepare graphene oxide, obtain graphene oxide film by vacuum filtration, and then obtain g...

Method used

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  • Preparation method of tough graphene/cellulose composite heat-conductive and electro-conductive film
  • Preparation method of tough graphene/cellulose composite heat-conductive and electro-conductive film

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preparation example Construction

[0025] In a specific embodiment, in the preparation method of the tough graphene / cellulose composite thermally and electrically conductive film of the present invention, respectively obtain graphene uniformly dispersed in a solvent and a fiber bundle solution of nanometer diameter uniformly dispersed in an aqueous solution, by Graphene / cellulose composite films were prepared by vacuum filtration. The specific steps are as follows:

[0026] 1. Preparation of Graphene Dispersion

[0027] The graphene used is industrialized graphene nanosheets as an example. The thickness is ~5 nm, the number of layers is about 10 layers, and the average sheet diameter is 5 μm. The graphene nanosheets and dispersant are added to the solvent to configure the concentration 1 mg / ml graphene nanosheet solution, and the graphene solution was ultrasonically treated for 3 min to obtain a uniformly dispersed graphene suspension;

[0028] 2. Preparation of Single Bundle Cellulose Dispersion

[0029] Di...

Embodiment 1

[0033] Embodiment 1: pure graphene nanosheet film

[0034] The 25 ml suspension of graphene nanosheets was vacuum-filtered using a microporous filter membrane. The graphene sheet reshaped the film-forming material by self-assembly. After filtering, it was rinsed with distilled water for several times, and the graphene film together with the filter paper was heated at room temperature. Then, the filter was peeled off from the microporous membrane, and then the sample was dried in a vacuum oven for 24 h. The dried graphene nanosheet film was placed on a hot press at a pressure of 65 MPa for 1 h to obtain a graphene nanosheet film with higher density.

[0035] The thickness of the graphene nanosheet / cellulose composite film prepared in this example is 0.095 mm, and its mechanical properties are poor, making it difficult to measure. Its in-plane thermal conductivity and electrical conductivity are 46 W / mK and 18 S / cm, respectively. It is worth noting that when the film was kept ...

Embodiment 2

[0036] Example 2: Composite film with cellulose content of 10 wt%

[0037] Take 25 ml of a graphene nanosheet solution with a concentration of 1 mg / ml, then slowly add 2.8 ml of a cellulose aqueous solution with a concentration of 1 mg / ml under stirring, stir evenly, and then sonicate at a power of 120 W 5 min, followed by vacuum filtration, washing, drying and other steps to obtain a composite film with a cellulose content of 10 wt%.

[0038] The thickness of the graphene nanosheet / cellulose composite film prepared by this method is 0.09 mm, the tensile strength, modulus and elongation at break are 1.5 MPa, 0.19 MPa and 2.5% respectively; the thermal conductivity and electrical conductivity in the plane direction They are 58W / mK and 14 S / cm respectively. When the film was kept under 65 MPa pressure for 1 h, the tensile strength, modulus and elongation at break of the compacted graphene nanosheet / cellulose composite film were measured to be 11.4 MPa, 3.4 GPa and 1.9%, respectiv...

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Abstract

The invention discloses a preparation method of a tough graphene/cellulose composite heat-conductive and electro-conductive film. The preparation method of the tough graphene/cellulose composite heat-conductive and electro-conductive film comprises the following steps: firstly, dispersing the wood pulp into an aqueous solution to peel the wood pulp into single nano diameter single fibrous bundles under the action of liquid shear force; diluting the single fibrous bundles with deionized water and obtaining the low concentration cellulose aqueous solution through treating by a high-speed shearing machine for a certain period of time; then dispersing the industrial graphene nanosheets evenly into the aqueous solution containing the dispersant through ultrasonic treatment; then dripping the prepared cellulose aqueous solution gradually into the graphene dispersion; and preparing the graphene/cellulose composite film through ultrasonic mixing, suction filtration, drying and other processes. The obtained film has good flexibility, thermal conductivity and electrical conductivity, and the mechanical, thermal and electrical properties of the film can be further improved through hot pressing treatment. The preparation method of the tough graphene/cellulose composite heat-conductive and electro-conductive film has the advantages of simple process, low cost, green environment protection and wide application value in the field of functional composite materials.

Description

technical field [0001] The invention belongs to the research field of nanomaterials and functional materials, and specifically relates to a preparation method of a tough graphene / cellulose composite heat-conducting and conducting film. Background technique [0002] Graphene refers to a single-layer carbon carbon material with a thickness of about 0.35 nm, which is closely arranged in a hexagonal two-dimensional honeycomb lattice of carbon atoms. Carbon atoms in graphene are connected to three adjacent carbon atoms through α bonds, and the bond length between carbon and carbon is only 0.142 nm. These strong C-C bonds form a bond angle of 120°, making graphene the world’s most The strongest and hardest material in the world. The specific surface area of ​​graphene is as high as 2630 m 2 / g, the tensile strength and Young's modulus reach 130GPa and 1TPa respectively, and its theoretical thermal conductivity is 5300 W / m K, which is much higher than that of metal and carbon nan...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B1/24
CPCH01B13/00H01B1/24
Inventor 王富忠
Owner QILU UNIV OF TECH
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