A kind of graphene heat-conducting silica gel sheet and preparation method thereof

Abstract

The invention discloses a graphene heat-conducting silica gel sheet and a preparation method thereof, comprising the preparation of a graphene oxide aqueous solution, the preparation of a graphene oxide roll, the preparation of a graphene roll film, the preparation of a graphene sheet, the configuration of a heat-conducting silica gel solution, Preparation of graphene thermally conductive silicone rolls. The graphene heat-conducting silicone sheet produced by the invention has high viscosity, high thermal conductivity and good tear resistance, and can meet various heat dissipation requirements.

Description

technical field

[0001] The invention relates to the technical field of graphene thermally conductive materials, in particular to a graphene thermally conductive silica gel sheet and a preparation method thereof. Background technique

[0002] With the development of the electronic information industry and the miniaturization and multi-function of electronic equipment, more powerful functions are integrated into smaller electronic components. Therefore, under high-frequency operation, the heat dissipation of electronic devices is particularly important. The two solid surfaces between the electronic device and the heat dissipation device have a certain roughness, that is, the surface is uneven, the actual contact area is only about 10% of the macro contact area, and the rest are all gaps, and the thermal conductivity of air is 0.025W / (mK), which greatly increases the thermal resistance and reduces the heat dissipation efficiency of electronic devices. For this reason, it is ...

Examples

preparation example Construction

[0023] A preparation method for a graphene thermally conductive silica gel sheet, comprising the following steps:

[0024] Step 1: dissolving graphene oxide in distilled water to prepare a graphene oxide aqueous solution of 0.1 wt% to 1.5 wt%;

[0025] Step 2: Coat the graphene oxide aqueous solution on the heating plate to form a layer of 1-2mm film. When the film loses 40wt%-50wt% of water and falls off the heating plate, use a bundle of carbon fiber bundles as a winding rod to wrap it Roll into a roll to obtain a graphene oxide roll and dry it in an oven;

[0026] Step 3: Carbonize the graphene oxide roll first, and then graphitize it to obtain a density of 0.1-0.2g / cm 3 Graphene roll film;

[0027] Step 4: Cut the graphene film into graphene sheets with a thickness not less than 0.3 mm;

[0028] Step 5: Configure a thermally conductive silica gel solution; vacuum mix A / B two-component silica gel, and obtain a thermally conductive silica gel solution after 1 to 2 hours; ...

Embodiment 1

[0061] A preparation method for a graphene thermally conductive silica gel sheet, comprising the following steps:

[0062] Step 1: Dissolve 5.18g of graphene oxide with a solid content of 38.6% in 194.82g of distilled water, and combine with ultrasonic stirring for 2h to prepare a 1wt% graphene oxide aqueous solution;

[0063] Step 2: Coat the graphene oxide aqueous solution on the heating plate to form a film of 1-2mm, and set the temperature of the heating plate to 80°C to dehydrate the film; when the film loses 40wt% of water and falls off the heating plate, Use a bundle of carbon fiber bundles as a rolling rod to roll it into a roll to obtain a graphene oxide roll. The gap between layers of the graphene oxide roll is less than 1mm, and dry it in an oven at 80°C for 2 to 4 hours;

[0064] Step 3: Carbonize graphene oxide rolls in graphene rolls in a tube furnace, and the heating rate of the tube furnace is divided into three stages:

[0065] The first stage: keep graphene ...

Embodiment 2

[0073] refer to figure 1 , on the basis of Example 1, a graphene heat-conducting silica gel sheet is made, including graphene roll 1, heat-conducting silica gel 2 and carbon fiber bundle 3; graphene roll 1 is wound on the outside of carbon fiber bundle 3; heat-conducting silica gel 2 is bonded On the surface of the graphene roll 1 after tiling.

technical field

[0001] The invention relates to the technical field of graphene thermally conductive materials, in particular to a graphene thermally conductive silica gel sheet and a preparation method thereof. Background technique

[0002] With the development of the electronic information industry and the miniaturization and multi-function of electronic equipment, more powerful functions are integrated into smaller electronic components. Therefore, under high-frequency operation, the heat dissipation of electronic devices is particularly important. The two solid surfaces between the electronic device and the heat dissipation device have a certain roughness, that is, the surface is uneven, the actual contact area is only about 10% of the macro contact area, and the rest are all gaps, and the thermal conductivity of air is 0.025W / (mK), which greatly increases the thermal resistance and reduces the heat dissipation efficiency of electronic devices. For this reason, it is ...

Examples

preparation example Construction

[0023] A preparation method for a graphene thermally conductive silica gel sheet, comprising the following steps:

[0024] Step 1: dissolving graphene oxide in distilled water to prepare a graphene oxide aqueous solution of 0.1 wt% to 1.5 wt%;

[0025] Step 2: Coat the graphene oxide aqueous solution on the heating plate to form a layer of 1-2mm film. When the film loses 40wt%-50wt% of water and falls off the heating plate, use a bundle of carbon fiber bundles as a winding rod to wrap it Roll into a roll to obtain a graphene oxide roll and dry it in an oven;

[0026] Step 3: Carbonize the graphene oxide roll first, and then graphitize it to obtain a density of 0.1-0.2g / cm 3 Graphene roll film;

[0027] Step 4: Cut the graphene film into graphene sheets with a thickness not less than 0.3 mm;

[0028] Step 5: Configure a thermally conductive silica gel solution; vacuum mix A / B two-component silica gel, and obtain a thermally conductive silica gel solution after 1 to 2 hours; ...

Embodiment 1

[0061] A preparation method for a graphene thermally conductive silica gel sheet, comprising the following steps:

[0062] Step 1: Dissolve 5.18g of graphene oxide with a solid content of 38.6% in 194.82g of distilled water, and combine with ultrasonic stirring for 2h to prepare a 1wt% graphene oxide aqueous solution;

[0063] Step 2: Coat the graphene oxide aqueous solution on the heating plate to form a film of 1-2mm, and set the temperature of the heating plate to 80°C to dehydrate the film; when the film loses 40wt% of water and falls off the heating plate, Use a bundle of carbon fiber bundles as a rolling rod to roll it into a roll to obtain a graphene oxide roll. The gap between layers of the graphene oxide roll is less than 1mm, and dry it in an oven at 80°C for 2 to 4 hours;

[0064] Step 3: Carbonize graphene oxide rolls in graphene rolls in a tube furnace, and the heating rate of the tube furnace is divided into three stages:

[0065] The first stage: keep graphene ...

Embodiment 2

[0073] refer to figure 1 , on the basis of Example 1, a graphene heat-conducting silica gel sheet is made, including graphene roll 1, heat-conducting silica gel 2 and carbon fiber bundle 3; graphene roll 1 is wound on the outside of carbon fiber bundle 3; heat-conducting silica gel 2 is bonded On the surface of the graphene roll 1 after tiling.

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