Cellulose/carbon nanotube composite film as well as preparation method and application thereof

A carbon nanotube composite and carbon nanotube technology, applied in the field of cellulose/carbon nanotube composite film and its preparation, can solve the problem of sacrificing material mechanical properties, light weight, flexibility and processability, high filler addition and Problems such as sample thickness, high contact resistance and thermal resistance, etc., to achieve good mechanical flexibility, excellent mechanical properties, and improved electrical and thermal conductivity

Inactive Publication Date: 2021-09-24
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing products usually have high filler loading and sample thickness, which greatly sacrifices the mechanical properties, light weight, flexibility and processability of the material
Meanwhile, although CPC has a high content of fillers, EC and TC are still limited due to the relatively high contact resistance and thermal resistance between fillers separated by polymers.

Method used

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  • Cellulose/carbon nanotube composite film as well as preparation method and application thereof
  • Cellulose/carbon nanotube composite film as well as preparation method and application thereof
  • Cellulose/carbon nanotube composite film as well as preparation method and application thereof

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preparation example Construction

[0037] The present invention also provides a preparation method for the cellulose / carbon nanotube composite film described in the above technical solution, comprising the following steps:

[0038] The cellulose aqueous dispersion and the carbon nanotube aqueous dispersion are alternately filtered on the surface of the filter membrane, and the filter membrane is removed to obtain a cellulose / carbon nanotube composite film.

[0039] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0040] In the present invention, the concentration of the aqueous cellulose dispersion is preferably 0.1-2 mg / mL, more preferably 0.5-1 mg / mL. In the present invention, the preparation method of the aqueous cellulose dispersion preferably includes: mixing cellulose and water to obtain an aqueous cellulose dispersion. In the present invention, the type of the cellulose is the same as the cellulose in the cellulose ...

Embodiment 1

[0056] The microfibrillated cellulose is mixed with water to obtain a microfibrillated cellulose aqueous dispersion; the concentration of the microfibrillated cellulose in the microfibrillated cellulose aqueous dispersion is 0.5 mg / mL.

[0057] Carbon nanotubes, Triton X-100 and water are mixed to obtain a carbon nanotube aqueous dispersion; the concentration of carbon nanotubes in the carbon nanotube aqueous dispersion is 0.6mg / mL, and the mass fraction of Triton X-100 is 1wt %.

[0058] Using vacuum filtration, filter 15mL of the microfibrillated cellulose aqueous dispersion, 25mL of the carbon nanotube aqueous dispersion, and 15mL of the microfibrillated cellulose aqueous dispersion on the surface of a mixed fiber filter membrane with a pore diameter of 0.45 μm. solution, the vacuum degree is 0.1MPa; rinse the obtained composite film with a large amount of deionized water, then soak it in acetone bath several times to dissolve the mixed fiber filter membrane, and dry at roo...

Embodiment 2

[0060] The microfibrillated cellulose is mixed with water to obtain a microfibrillated cellulose aqueous dispersion; the concentration of the microfibrillated cellulose in the microfibrillated cellulose aqueous dispersion is 0.5 mg / mL.

[0061] Carbon nanotubes, Triton X-100 and water are mixed to obtain a carbon nanotube aqueous dispersion; the concentration of carbon nanotubes in the carbon nanotube aqueous dispersion is 0.6mg / mL, and the mass fraction of Triton X-100 is 1wt %.

[0062] Using vacuum filtration, filter 7.5mL of the microfibrillated cellulose aqueous dispersion, 8.33mL of the carbon nanotube aqueous dispersion, and 7.5mL of the microfibrillated fiber on the surface of a mixed fiber filter membrane with a pore diameter of 0.45 μm. plain water dispersion, 8.33mL of said carbon nanotube water dispersion, 7.5mL of said microfibrillated cellulose water dispersion, 8.33mL of said carbon nanotube water dispersion and 7.5mL of said microfibrillated cellulose water Di...

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Abstract

The invention provides a cellulose / carbon nanotube composite film as well as a preparation method and application thereof, and relates to the technical field of flexible conductive materials. The cellulose / carbon nanotube composite film provided by the invention comprises cellulose layers and carbon nanotube layers which are alternately laminated. According to the invention, the cellulose layers and the carbon nanotube layers are alternately laminated, so that the conductive material carbon nanotubes can be uniformly distributed between the cellulose layers, and the conductivity and the thermal conductivity of the composite film are improved. The cellulose / carbon nanotube composite film provided by the invention has excellent mechanical properties, electrical conductivity, thermal conductivity and electromagnetic shielding performance. Due to good mechanical flexibility, the electromagnetic shielding performance of the composite film is basically kept unchanged after repeated 180-degree folding for 5000 times. The cellulose / carbon nanotube composite film has the advantage of excellent comprehensive performance and easiness in large-scale manufacturing, so that the cellulose / carbon nanotube composite film has a wide application prospect in aerospace and next-generation flexible electronic devices.

Description

technical field [0001] The invention relates to the technical field of flexible conductive materials, in particular to a cellulose / carbon nanotube composite film and its preparation method and application. Background technique [0002] With the miniaturization, integration, and high-frequency development of electronic devices, more and more electromagnetic pollution and heat accumulation will be generated during the operation of electronic devices, which will seriously damage the accuracy of equipment and even threaten personal health. Traditionally, conductive metals are used to reduce electromagnetic pollution and increase heat dissipation, but their strong corrosion, high density, and low flexibility run counter to the requirements of next-generation wearable smart protective equipment. [0003] Compared with metal-based materials, conductive polymer composites (CPCs) are a better choice for electromagnetic shielding and heat dissipation components in smart electronic dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/02C08K3/04
CPCC08J5/18C08J2301/02C08K3/041
Inventor 宾月珍樊明帅王海胡朝晖
Owner DALIAN UNIV OF TECH
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