Graphene film graphitization method

Abstract

The invention relates to a graphene film graphitization method which is characterized by comprising the following steps: step 1, cutting a graphene film into a corresponding size according to the size of a graphite cylinder of an internal tandem graphitization furnace; step 2, wrapping a circle of graphite paper with the corresponding size on a graphite cylinder of the internal tandem graphitization furnace, winding a graphene film with the corresponding specification size on the periphery of the graphite paper, namely the graphene film cut in the step 1, and then wrapping a circle of graphite paper on the outer end of the graphene film; 3, two annular supporting bodies with a supporting function are arranged on the outermost portion of the graphite column body in a sleeving mode; and step 4, connecting a plurality of graphite cylinders together with the graphene films end to end according to a charging mode of an internal tandem graphitization furnace, filling the whole furnace with the graphite cylinders, covering the furnace with a heat preservation material, electrifying two ends of a furnace end electrode, electrifying and heating according to a power transmission mode of a graphite electrode, and completing the graphitization treatment process after power transmission is completed and sequentially carrying out pressure maintaining, cooling and discharging procedures.

Description

Technical Field

[0001] The invention relates to the technical field of graphitization devices, in particular to a graphene film graphitization method. Background Art

[0002] With the advent of the 5G era, graphene film has also become a potential new star in the thermal management of the electronics industry, and is widely used in heat dissipation in fields such as 5G commercial electronic products and new energy vehicles. And based on the ultra-high conductivity of graphene film, it also has many applications in the fields of conduction and electromagnetic shielding. However, the current graphitization cost of graphene film is relatively high, while the graphitization processing cost of the internal series graphitization furnace is low, and a large amount of waste heat is generated after the graphitization temperature rises and cannot be used. How to achieve the graphitization of graphene film at low cost has become an urgent problem to be solved. In this regard, the present invention specifically proposes a graphene film graphitization method. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a graphene film graphitization method, and the technical solution to the problem is to include the following steps: Step 1: Cut the graphene film into corresponding sizes according to the size of the graphite cylinder of the inner string graphitization furnace; Step 2: Wrap the graphite cylinder of the inner string graphitization furnace with a circle of graphite paper of corresponding size, wrap a graphene film of corresponding specifications and sizes around the graphite paper, that is, the graphene film cut out in step 1, and then wrap another circle of graphite paper around the outer end of the graphene film; Step 3: Two annular supports with supporting functions are mounted on the outermost part of the graphite column of the inner string graphitization furnace; Step 4: Load several graphite cylinders together with graphene films into a full furnace end to end according to the loading method of an inner-string graphitization furnace, cover with insulation material, apply power to both ends of the furnace head electrode, and heat up according to the power supply method of the graphite electrode. After power supply is completed, the graphite treatment process is completed by sequentially going through the pressure maintenance, temperature reduction, and furnace discharge processes.

[0004] Preferably, the diameter of the graphite cylinder of the inner string graphitization furnace is 300-700 mm.

[0005] Preferably, the graphite paper has a thickness of 150-800 μm.

[0006] Preferably, the annular support body has a thickness of 50-100 mm and is made of graphite.

[0007] Preferably, the thermal insulation material is a mixture of one or more of petroleum coke, coal coke and asphalt coke.

[0008] The beneficial effects of the present invention are: The present invention utilizes the heat generated by the graphite cylinder of the inner string graphitization furnace to graphitize the graphene film, thereby saving energy. The present invention has a simple structure, is easy to use, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0010] Reference numerals 1. Graphite cylinder of internal string graphitization furnace, 2. Graphite paper, 3. Ring support. DETAILED DESCRIPTION

[0011] The following is combined with Figure 1 The specific implementation modes of the present invention are further described in detail.

[0012] Embodiment 1, its technical solution is, please refer to Figure 1 As shown, the graphene film is cut according to the length and diameter of the inner string graphitization furnace graphite cylinder 1 (or the inner string graphitization furnace graphite electrode cylinder, hereinafter referred to as the graphite cylinder) with a diameter of 300 mm; the graphite cylinder is wrapped with a circle of graphite paper 2 of corresponding size, and the low-temperature carbonized graphene film of corresponding size is wrapped around the outer surface of the graphite paper 2, and the outer end of the graphene film is wrapped with another circle of graphite paper 2; a ring-shaped support body 3 of graphite material with a supporting function is sleeved on the outermost part of the graphite cylinder; the insulation material is laid, and the two ends of the furnace head electrode are energized and heated according to the power transmission method of the graphite electrode. After the power transmission is completed, the pressure is maintained, the temperature is reduced, and the furnace is taken out to complete the graphitization process.

[0013] During the above graphitization process, the temperature of different parts of the graphene film on the graphite column was measured, and the temperature difference was ≤±1.5%℃.

[0014] The graphite paper 2 wrapped by the graphite column mainly plays the role of isolating the graphene film from the thermal insulation material.

[0015] The annular support body 3 is composed of two upper and lower semicircular rings meshed together to form the annular support body 3, and its main function is to support the thermal insulation material and protect the graphene film from damage.

[0016] The graphene film stack contains 50 graphene films. Example 2, based on Example 1, a graphite electrode with a diameter of 700 mm is selected as a graphite cylinder, and the graphene film stack includes 50 sheets of graphene film wrapped around the graphite cylinder. Two prepared semicircular rings with a thickness of 50 mm of graphite material are used as annular support 3. Add insulation material, energize according to the power-on mode of the graphite electrode, and perform heating, heat preservation, cooling, and furnace removal according to the temperature curve of the graphite electrode to finally obtain a graphitized graphene film.

[0017] During the above graphitization process, the temperature of different parts of the graphene film on the graphite column was measured, and the temperature difference was ≤±2%℃.

[0018] In addition, it should be understood that this specification is described in accordance with the implementation methods. However, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should read the specification as a whole. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A graphene film graphitization method, characterized in that: The steps include: Step 1: cutting the graphene film into corresponding sizes according to the size of the graphite cylinder (1) of the inner-string graphitization furnace; Step 2: Wrap the inner-string graphitization furnace graphite cylinder (1) with a circle of graphite paper (2) of corresponding size, wrap a graphene film of corresponding specifications and sizes around the graphite paper (2), that is, the graphene film cut out in step 1, and then wrap another circle of graphite paper (2) around the outer end of the graphene film; Step 3: Two annular support bodies (3) with supporting functions are mounted on the outermost part of the graphite column (1) of the inner series electrode graphitization furnace; Step 4: Load several graphite cylinders together with graphene films into a full furnace end to end according to the loading method of an inner-string graphitization furnace, cover with insulation material, apply power to both ends of the furnace head electrode, and heat up according to the power supply method of the graphite electrode. After power supply is completed, the graphite treatment process is completed by sequentially going through the pressure maintenance, temperature reduction, and furnace discharge processes.

2. A graphene film graphitization method according to claim 1, characterized in that: The diameter of the graphite column (1) of the inner-string graphitization furnace is 300-700 mm.

3. A graphene film graphitization method according to claim 1, characterized in that: The thickness of the graphite paper is 150-800 μm.

4. A graphene film graphitization method according to claim 1, characterized in that: The annular support body (3) has a thickness of 50-100 mm, is made of graphite, and is composed of two meshed upper and lower semicircular rings.

5. A graphene film graphitization method according to claim 1, characterized in that: The annular support (3) in step 3 is made of graphite, with a flexural strength of 5-100 MPa, a compressive strength of 10-200 MPa, and a density of 1.6-1.85 g / cm 3 .

6. A graphene film graphitization method according to claim 1, characterized in that: In the step 2, the ash content of the graphite paper is less than 0.5%, and the carbon content is greater than 99.5%.

7. A graphene film graphitization method according to claim 1, characterized in that: The thermal insulation material used in step 4 is a mixture of one or more of petroleum coke, coal coke and asphalt coke.

8. A graphene film graphitization method according to claim 1, characterized in that: In the step 4, the total length of the multiple graphite columns together with the graphene film after being connected in series is 1-60m.

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