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Layered polypropylene/graphene heat-conducting composite material and preparation method thereof

A thermally conductive composite material, graphene technology, applied in coatings and other directions, can solve the problems of insignificant improvement of thermal conductivity, high dispersion cost of graphene, damage to PP mechanical properties, etc., to achieve excellent thermal conductivity/heat dissipation and mechanical properties, good Conducive to large-scale mass production and stable product quality

Inactive Publication Date: 2020-03-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of chemical modification to improve the dispersion of graphene is costly, the process is complicated, and the mechanical properties of PP will be damaged in the case of high filling.
In addition, the improvement of the heat conduction effect is not obvious

Method used

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  • Layered polypropylene/graphene heat-conducting composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method of the layered polypropylene / graphene thermally conductive composite material provided by the present embodiment comprises the following steps:

[0033] (1) Using the PP film as the base material, modifying dopamine onto the surface of the PP film, forming a polydopamine layer on the surface through a self-polymerization process, and performing hydrophilic modification on the surface of the PP film to obtain a surface-modified PP film; the PP The thickness of the film is 10μm~1mm;

[0034] The specific steps of the self-polymerization modification process on the surface of the PP film with dopamine are:

[0035] (11) Prepare tris (Tris) buffer solution with a concentration of 0.01mol / L to 0.1mol / L, preferably 0.01mol / L;

[0036] (12) Use hydrochloric acid to adjust the pH value of the buffer solution, 8.0-8.5, preferably 8.5; disperse dopamine in the buffer solution, the content is 1g / L-3g / L, preferably 2g / L;

[0037] (13) Immerse the PP film in...

Embodiment 2

[0049] The preparation method and material of the layered polypropylene / graphene thermally conductive composite material provided in this embodiment are basically the same as in Example 1, except that:

[0050] (1) Use PP film as the base material, modify dopamine on the polypropylene film, and form a polydopamine layer on the surface of polypropylene: the thickness of the polypropylene film is 20 μm, and the tris (Tris) buffer solution is prepared at a concentration of 0.01 mol / L, use hydrochloric acid to adjust the pH value of the buffer to 8.5; disperse dopamine in the buffer with a content of 2g / L; immerse a polypropylene film with a thickness of 20 μm in the buffer, adjust the temperature to 60°C, and stir slowly Installed under the tower, soaked for 24h, the gained polydopamine modified polypropylene film was rinsed repeatedly with deionized water and ethanol, and dried at room temperature;

[0051] (2) Graphene oxide is covered on the modified PP plastic film to form a ...

Embodiment 3

[0055] The preparation method and material of the layered polypropylene / graphene thermally conductive composite material provided in this embodiment are basically the same as those in Embodiments 1 and 2, except that:

[0056] (1) Use PP film as the base material, modify dopamine on the polypropylene film, and form a polydopamine layer on the surface of polypropylene: the thickness of the polypropylene film is 20 μm, and the tris (Tris) buffer solution is prepared at a concentration of 0.01 mol / L, use hydrochloric acid to adjust the pH value of the buffer to 8.5; disperse dopamine in the buffer with a content of 2g / L; immerse a polypropylene film with a thickness of 20 μm in the buffer, adjust the temperature to 60°C, and stir slowly Put it under the tower, soak for 24 hours, and the obtained polydopamine-modified polypropylene film is washed repeatedly with deionized water and ethanol, and dried at room temperature.

[0057] (2) Graphene oxide is covered on the modified PP pl...

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Abstract

The invention discloses a preparation method of a layered polypropylene / graphene heat-conducting composite material. The preparation method comprises the following steps: with a PP film as a substrate, modifying the PP film by using the characteristic of auto-polymerization of dopamine to improve the hydrophilicity of the PP film; covering the modified PP film with graphene oxide to form a graphene oxide layer; and carrying out hot pressing to obtain the heat-conducting composite film with a layered structure. According to the invention, process is greatly simplified, cost is reduced, controlis convenient, product quality is stable, and large-scale batch production is facilitated. The invention further provides the layered polypropylene / graphene heat-conducting composite material, and byconstructing a two-dimensional continuous graphene network, the heat-conducting property of the polypropylene material is greatly improved while the excellent mechanical property of the polypropylenematerial is maintained.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a layered polypropylene / graphene thermally conductive composite material and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, communication circuits, semiconductors and other equipment are gradually becoming smaller and denser. The rapid operation of these high-power devices will generate a lot of heat, and long-term use will not only affect the accuracy of electronic devices, but also cause damage to the equipment and affect its life. Therefore, it is very necessary to study high-performance thermal management devices with good heat dissipation characteristics. Therefore, high thermal conductivity materials must be prepared to meet their heat dissipation requirements. [0003] Polypropylene is used in all aspects of life and production due to its light weight, low price, and excellent mechanical properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/16C08J7/06C08J7/04C08L23/12
CPCC08J7/06C08J7/16C08J2323/12C08J2479/04
Inventor 宋娜曹东磊丁鹏施利毅
Owner SHANGHAI UNIV
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