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Nano cellulose/expanded graphite composite film and preparation method thereof

A technology of nanocellulose and expanded graphite, which is applied in the field of carbon materials, can solve the problems of no synergistic enhancement effect, poor mechanical properties of expanded graphite, and unbearable, etc., and achieve the effect of rich application range, low cost, and high strength

Active Publication Date: 2022-03-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the mechanical properties of expanded graphite are extremely poor, and its tensile strength is generally only about 10MPa, which cannot withstand large loads.
In order to combine the advantages of nanocellulose and expanded graphite, Yang et al. prepared a composite material, but the preparation process is simply mixed, the performance of the composite material is only the average of the properties of nanocellulose and expanded graphite, and the thermal conductivity is improved at the same time. Mechanical strength, no synergistic reinforcement effect

Method used

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  • Nano cellulose/expanded graphite composite film and preparation method thereof
  • Nano cellulose/expanded graphite composite film and preparation method thereof
  • Nano cellulose/expanded graphite composite film and preparation method thereof

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Experimental program
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Embodiment 1

[0034] see figure 1 As shown, this embodiment provides a preparation method of a nanocellulose / expanded graphite composite film, comprising the following steps:

[0035] S1: obtaining nanocellulose slurry and expanded graphite, specifically, the nanocellulose slurry can be prepared from plant fibers or bacterial products, and the expanded graphite is prepared from graphite interlayer compounds expanded at a high temperature of 800°C;

[0036] S2: The nanocellulose slurry and the expanded graphite are mixed by stirring and ultrasonic treatment, so that the expanded graphite is dispersed in the nanocellulose slurry to obtain a mixed slurry, and the stirring speed is 4000 rpm , the ultrasonic power is 1200 watts. Since the surface of the cellulose molecular chain is rich in hydroxyl and carboxyl groups, electrostatic repulsion can be formed, so that the hydrophobic and difficult-to-disperse expanded graphite is evenly dispersed in the nanocellulose slurry;

[0037] S3: performin...

Embodiment 2

[0048] The present embodiment provides a preparation method of nanocellulose / expanded graphite composite film, comprising the following steps:

[0049] First, obtain nanocellulose slurry and expanded graphite. Nanocellulose slurry can be prepared from plant fibers or bacterial products. Expanded graphite is prepared from graphite intercalation compounds expanded at high temperature at 800 °C. The mass ratio of expanded graphite in the composite film is 40%;

[0050] Then the nanocellulose slurry and the expanded graphite are mixed by stirring and ultrasonic treatment, so that the expanded graphite is dispersed in the nanocellulose slurry to prepare a mixed slurry, and the stirring speed is 4000 r / min, The ultrasonic power is 1200 watts. Since the surface of the cellulose molecular chain is rich in hydroxyl and carboxyl groups, electrostatic repulsion can be formed, so that the hydrophobic and difficult-to-disperse expanded graphite is evenly dispersed in the nanocellulose slur...

Embodiment 3

[0055] Based on the same inventive concept, this embodiment also provides a nanocellulose / expanded graphite composite film, which is prepared by the preparation method of Embodiment 1 or Embodiment 2, including nanocellulose and expanded graphite. The nanofiber The elements are distributed between the lamellae gaps of the expanded graphite, the strength of the composite film is 80-140MPa, and the toughness is 4-8MJ / m 3 , the thermal conductivity in the in-plane direction is 10 to 40 W / mK.

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Abstract

The invention discloses a preparation method of a nanocellulose / expanded graphite composite film, which comprises the following steps: firstly, obtaining nanocellulose slurry and expanded graphite, and then mixing the nanocellulose slurry and the expanded graphite in a stirring and ultrasonic treatment mode, according to the preparation method, expanded graphite is dispersed in nano cellulose slurry to prepare mixed slurry, then the mixed slurry is subjected to suction filtration to prepare hydrogel, finally, the hydrogel is subjected to hot pressing to prepare the composite film, the prepared composite film has excellent comprehensive performance such as high strength, high toughness and high heat conductivity, and synergistic enhancement of the performance is achieved.

Description

technical field [0001] The invention belongs to the field of carbon materials, and in particular relates to a nanocellulose / expanded graphite composite film and a preparation method thereof. Background technique [0002] In recent years, flexible devices have developed rapidly, such as wearable devices, flexible electronic devices, and soft robots. With the improvement of device performance, the power consumption and heat production increase greatly, which brings hidden dangers to the operation stability, so effective thermal management is required. At present, thermal management materials mostly use composite materials composed of plastic matrix and inorganic fillers, in which the plastic matrix is ​​difficult to degrade and causes serious environmental pollution, while the inorganic fillers are mostly nanomaterials such as graphene, carbon nanotubes, and boron nitride, which are easy to aggregate, The disadvantages of small lateral size, large interfacial thermal resistan...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/02C08K7/24
CPCC08J5/18C08J2301/02C08K7/24
Inventor 王丽伟张博吴韶飞张宸
Owner SHANGHAI JIAO TONG UNIV