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High-quality graphene, heat-conducting and electric-conducting epoxy resin composite material thereof and preparation method thereof

A conductive epoxy resin and composite material technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of increasing power consumption of electronic devices, poor thermal conductivity of epoxy resin, and no electrical conductivity, etc., to improve mechanical strength, excellent The effect of thermal and electrical conductivity and easy operation

Inactive Publication Date: 2019-12-27
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, epoxy resin itself is not conductive. When it is used in the electronic industry, it will bring a large resistance and increase the power consumption of electronic devices.
At the same time, the thermal conductivity of epoxy resin is very poor, the heat generated is not easy to dissipate, and it is easy to cause damage to the material. Therefore, it is necessary to develop functional epoxy resin composite materials.
However, the functions of the existing epoxy resin composite materials are relatively single, and the preparation process is relatively cumbersome, which limits its further application.

Method used

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  • High-quality graphene, heat-conducting and electric-conducting epoxy resin composite material thereof and preparation method thereof
  • High-quality graphene, heat-conducting and electric-conducting epoxy resin composite material thereof and preparation method thereof
  • High-quality graphene, heat-conducting and electric-conducting epoxy resin composite material thereof and preparation method thereof

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Experimental program
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Embodiment 1

[0032] The first embodiment of the present invention provides a method for preparing high-quality graphene by thermal repair at 1300°C. It includes the following steps:

[0033] Step 1: Preparation of graphene oxide—dissolve 10g of sodium nitrate in 300mL of concentrated sulfuric acid, add 10g of 300-mesh natural graphite powder, add 30g of potassium permanganate below 5°C, react at 35°C for 6h, add 400mL to remove The ionized water was reacted for 15 min, and the graphene oxide was obtained by washing with water, centrifuging, and freeze-drying.

[0034] Step 2: Preparation of reduced graphene oxide - 2 g of graphene oxide powder was placed in a muffle furnace, and expanded at 1050° C. for 30 s to obtain thermally expanded exfoliated reduced graphene oxide.

[0035] Step 3: Preparation of high-quality graphene - 2 g of reduced graphene oxide powder is placed in a high-temperature graphitization furnace, and thermally repaired at 1300° C. for 2 hours to obtain high-quality gr...

Embodiment 2

[0037] The second embodiment of the present invention provides a method for preparing high-quality graphene by thermal repair at 1500°C. It includes the following steps:

[0038] Step 1: Preparation of graphene oxide—dissolve 10g of sodium nitrate in 300mL of concentrated sulfuric acid, add 10g of 300-mesh natural graphite powder, add 30g of potassium permanganate below 5°C, react at 35°C for 6h, add 400mL to remove The ionized water was reacted for 15 min, and the graphene oxide was obtained by washing with water, centrifuging, and freeze-drying.

[0039] Step 2: Preparation of reduced graphene oxide - 2 g of graphene oxide powder was placed in a muffle furnace, and expanded at 1050° C. for 30 s to obtain thermally expanded exfoliated reduced graphene oxide.

[0040] Step 3: Preparation of high-quality graphene - 2 g of reduced graphene oxide powder is placed in a high-temperature graphitization furnace, and thermally repaired at 1500° C. for 2 hours to obtain high-quality g...

Embodiment 3

[0042] The third embodiment of the present invention provides a method for preparing high-quality graphene by thermal repair at 1800°C. It includes the following steps:

[0043] Step 1: Preparation of graphene oxide—dissolve 10g of sodium nitrate in 300mL of concentrated sulfuric acid, add 10g of 300-mesh natural graphite powder, add 30g of potassium permanganate below 5°C, react at 35°C for 6h, add 400mL to remove The ionized water was reacted for 15 min, and the graphene oxide was obtained by washing with water, centrifuging, and freeze-drying.

[0044] Step 2: Preparation of reduced graphene oxide - 2 g of graphene oxide powder was placed in a muffle furnace, and expanded at 1050° C. for 30 s to obtain thermally expanded exfoliated reduced graphene oxide.

[0045] Step 3: Preparation of high-quality graphene—2 g of reduced graphene oxide powder was placed in a high-temperature graphitization furnace, and thermally repaired at 1800° C. for 2 hours to obtain high-quality gra...

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Abstract

The invention discloses high-quality graphene, a heat-conducting and electric-conducting epoxy resin composite material thereof and a preparation method of the composite material. The preparation method sequentially comprises the following steps: S1, preparing graphene oxide through an improved Hummers method; S2, performing thermal expansion stripping on the graphene oxide powder obtained in thestep S1 through a muffle furnace to obtain reduced graphene oxide with few lamellas; S3, putting the reduced graphene oxide powder obtained in the step S2 into a high-temperature graphitization furnace for thermal repair; and S4, mixing an epoxy monomer, a curing agent and a curing accelerator, adding the graphene powder obtained in the step S3, performing uniform mixing through a planetary defoaming machine, and performing one-step curing to obtain the composite material. The method has the advantages of being simple in process, high in efficiency, large in yield and capable of achieving macroscopic preparation.

Description

technical field [0001] The present application relates to high-quality graphene and thermally conductive and conductive epoxy resin composite materials and preparation methods thereof, in particular to a method for preparing high-quality graphene by thermal expansion followed by high-temperature repair and one-step curing to prepare thermally conductive and conductive epoxy resin composite materials. Background technique [0002] Graphene is a two-dimensional sheet material composed of sp2-hybridized carbon atoms in the form of six-membered rings. Due to its special structure, graphene has many excellent properties, such as high strength, high modulus, and high electrical conductivity. , High thermal conductivity, excellent thermal stability, acid and alkali resistance, etc. Graphene has been extensively studied since its discovery by Geim et al. at the University of Manchester in 2004. [0003] Although graphene has been extensively studied, the large-scale preparation of ...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K3/04C01B32/19
CPCC08K3/042C01B32/19C08L63/00
Inventor 常伟隋延秋徐驰陆洪彬
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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