Graphene heating film and preparation method thereof

Abstract

The invention relates to the field of graphene heating, in particular to a graphene heating film and a preparation method thereof.The preparation method comprises the following steps that S1, packaging ink is applied to the surface of a release film to form a packaging ink layer; s2, the surface of the packaging ink layer is equally divided into an area A and an area B, electrodes and heating ink are applied to the area A and the area B of the packaging ink layer respectively, the electrodes form an electrode layer, and the heating ink forms a heating ink layer; the release film, the packaging ink layer, the electrode layer and the heating ink layer form a heating film semi-finished product; s3, folding the heating film semi-finished product in half to enable the electrode layer to be attached to the heating ink layer, and coating the outer surface of the heating film semi-finished product with a release film; then drying and rolling the heating film semi-finished product; s4, tearing off the release film, and finally obtaining the graphene heating film. Through the scheme, the preparation efficiency of the graphene heating film is improved, and the problem of low preparation efficiency of the graphene heating film in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of graphene heating, specifically to a graphene heating film and its preparation method. Background Technology

[0002] Chinese invention patent application CN117866482A discloses a graphene heating film encapsulation ink, a graphene heating film, and a preparation method thereof. The heating film preparation process in this prior art patent is as follows: encapsulation ink is printed on the surface of a release film and dried at 120°C. After drying, the release film is removed to obtain a printed encapsulation layer. Copper tape electrodes are attached to the surface of the encapsulation ink, pressed tightly, and then heating ink is printed. After drying at 120°C, a conductive heating layer is formed. After drying, encapsulation ink is sprayed onto the surface to make it uniform and smooth, and then dried to form a sprayed encapsulation layer.

[0003] The preparation process of the aforementioned heating film is complex and inefficient, mainly due to the following reasons: 1. The printed encapsulation layer, conductive heating layer, and spray-coated encapsulation layer need to be dried separately, making the entire heating film preparation process time-consuming and inefficient. 2. The spray-coated and printed encapsulation layers need to be prepared separately by printing or spraying, which is time-consuming. 3. The electrodes need to be pressed separately onto the surface of the encapsulation ink, which is time-consuming. Furthermore, during the process of pressing the electrodes onto the surface of the encapsulation ink, the pressing roller surface may adhere to and carry away some encapsulation ink, resulting in ink loss from the heating film and contamination of the pressing roller surface with the encapsulation ink. Summary of the Invention

[0004] The present invention aims to provide a graphene heating film and its preparation method to improve the preparation efficiency of graphene heating film and solve the problem of low preparation efficiency of graphene heating film in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing a graphene heating film, comprising the following steps: S1. Apply the encapsulation ink to the surface of the release film to form an encapsulation ink layer; S2. The surface of the encapsulation ink layer is divided into two regions, A and B. Electrodes and heating ink are applied to regions A and B of the encapsulation ink layer respectively. The electrodes form an electrode layer and the heating ink forms a heating ink layer. The release film, encapsulation ink layer, electrode layer and heating ink layer form a heating film semi-finished product. S3. Fold the heating film semi-finished product in half to make the electrode layer and the heating ink layer adhere together, and cover the outer surface of the heating film semi-finished product with release film; then dry and roll the heating film semi-finished product. S4. Remove the release film to obtain the graphene heating film.

[0006] The principle and advantages of this scheme are as follows: Following steps S1 and S2, a semi-finished heating film is produced. After the semi-finished heating film is produced, the bottom layer is a release film, the layer above the release film is an encapsulation ink layer, and the layer above the encapsulation ink layer is an electrode layer and a heating ink layer, located in areas A and B respectively. Then, step S3 is performed, in which the semi-finished heating film is folded in half, and the electrode layer and the heating ink layer are adhered together. At this point, the semi-finished heating film, from one outer side to the other, consists of a release film, an encapsulation ink layer, an electrode layer, a heating ink layer, an encapsulation ink layer, and a release film. In this way, one encapsulation ink layer, an electrode layer, a heating ink layer, and another encapsulation ink layer are located between the release films on both sides of the semi-finished heating film. The release film protects the two layers of encapsulation ink, electrode, and heating ink. Then, the folded semi-finished heating film is rolled and dried. Drying cures the two layers of encapsulation ink, electrode, and heating ink, while rolling adheres and fixes them together. Finally, in step S4, the release film is peeled off from the encapsulation ink layer to obtain the graphene heating film.

[0007] The above-mentioned scheme has the following beneficial effects: 1. This scheme applies the encapsulation ink layer, electrode layer, and heating ink layer uniformly onto the release film and then dries them uniformly. This eliminates the need for separate drying of the multi-layer structure, thereby improving the preparation efficiency of the heating film. 2. In this scheme, the two encapsulation ink layers are first uniformly applied to the release film, and then the heating film semi-finished product is folded in half to form two encapsulation ink layers. These two encapsulation ink layers do not need to be printed or sprayed separately; they only need to be applied once, thus improving the preparation efficiency of the heating film. 3. Through rolling, the encapsulation ink layer, electrode layer, and heating ink layer are pressed and fixed together, eliminating the need for separate pressing of the multi-layer structure. The rolling step is completed in one step, simplifying the pressing process and improving the preparation efficiency of the heating film. 4. During the rolling process, the release film holds the encapsulation ink layer, electrode layer, and heating ink layer. During the rolling process, the release film protects the encapsulation ink layer, thereby preventing the encapsulation ink layer from adhering to the pressure roller, preventing the encapsulation ink on the heating film from being lost, and preventing the surface of the pressure roller from being contaminated by the encapsulation ink.

[0008] Preferably, as an improvement, step S3 is performed on a roller press drying apparatus; The roller press drying device includes a first frame, a second frame, a movable component, and multiple pressure rollers. A vertical roller press gap exists between the first frame and the second frame. The multiple pressure rollers are respectively disposed on the side of the roller press gap of the first frame and the side of the roller press gap of the second frame. The multiple pressure rollers on the first frame and the multiple pressure rollers on the second frame are vertically distributed. The pressure rollers on the first frame and the pressure rollers on the second frame are opposite to each other. A placement platform is provided on the top of both the first frame and the top of the second frame. In S1, the release film is laid on the first frame placement platform and the second frame placement platform; In S2, regions A and B are located on the placement platform of the first rack and the placement platform of the second rack, respectively. In S3, the moving part moves downward from above the middle of the heating film semi-finished product and drives the heating film semi-finished product to fold in half and enter the roller gap together; the pressure roller rolls the folded heating film semi-finished product.

[0009] Therefore, in step S1, the release film is laid on the first and second frame placement platforms, which support the laid-out release film. Then, in step S2, encapsulation ink, electrodes, and heating ink are applied to the release film. Next, in step S3, the moving part moves downwards from above the middle of the heating film semi-finished product. The moving part moves to the top of the roller gap, abutting against the heating film semi-finished product. As the moving part continues to move downwards, it enters the roller gap, pulling the heating film semi-finished product into it. Since the moving part is pressed against the middle of areas A and B of the heating film semi-finished product, it automatically folds over and enters the roller gap. As the moving part continues to move downwards, it pulls the folded heating film semi-finished product downwards within the roller gap. The folded heating film semi-finished product is then pressed by the pressure rollers on both sides, thus pressing and fixing the multi-layered structure between the release films on both sides of the heating film semi-finished product together.

[0010] Therefore, through this optimized solution, the moving part moves downward, allowing the heating film semi-finished product to enter the roller gap and automatically fold in half. After folding, it is then rolled, eliminating the need for separate folding of the heating film semi-finished product. The folding and rolling processes of the heating film semi-finished product are continuous and seamless, thereby improving the efficiency of production and manufacturing.

[0011] Preferably, as an improvement, both the first and second frames are equipped with hot air blowers, which face the roller gap; or, The pressure roller has a heating chamber inside, which contains heating wires or a heating medium.

[0012] Therefore, hot air is blown out by a hot air blower and flows into the gap between the rollers, thereby drying the semi-finished heating film that has been rolled. Alternatively, the rollers are equipped with heating chambers inside, and heating is achieved by heating wires or by a heating medium flowing through the rollers, thus heating the semi-finished heating film that passes through them and drying it.

[0013] Preferably, as an improvement, the roller pressing device further includes a cutting table with a cutting blade, the cutting table being located below the roller pressing gap; The moving part moves to the cutting table, and the cutting table cuts the heating film semi-finished product.

[0014] Thus, the moving part drives the heating film semi-finished product downward. After the heating film semi-finished product comes out of the roller gap, the moving part continues to drive the heating film semi-finished product downward. When the moving part moves to the cutting table, the moving part collides with the cutting blade. The cutting table cuts off the bottom of the heating film semi-finished product and then lifts the heating film semi-finished product upward, thereby realizing the separation of the moving part and the heating film semi-finished product.

[0015] Preferably, as an improvement, the moving part is elongated.

[0016] Preferably, as an improvement, both the bottom of the first frame and the bottom of the second frame are provided with cooling sections, and a cooling gap is provided between the two cooling sections, with the cooling gap and the rolling gap being opposite each other.

[0017] Therefore, after the heating film semi-finished product is folded in half and dried by roller pressing, it passes through a cooling gap to cool down, so that the heating film semi-finished product can be handled after being cut and manufactured.

[0018] Preferably, as an improvement, the cutting table is provided with two limiting parts, and there is a limiting gap between the two limiting parts, which is opposite to the roller pressing gap. Thus, when the moving part moves to the cutting table, the heating film semi-finished product enters the limiting gap, which limits the heating film semi-finished product, thereby preventing it from completely tipping over and facilitating its upward lifting, allowing it to separate from the moving part.

[0019] Preferably, as an improvement, the drying temperature is 120°C.

[0020] Preferably, as an improvement, the moving speed of the moving part is 1-2 m / min.

[0021] To achieve the above objectives, the present invention adopts the following technical solution: a graphene heating film, which is prepared by a method for preparing a graphene heating film. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a graphene heating film.

[0023] Figure 2 This is a schematic diagram of the roller pressing device.

[0024] Figure 3 for Figure 2 A schematic diagram of the structure of the heating film semi-finished product on the intermediate roller pressing device.

[0025] Figure 4 This is a schematic diagram of the roller pressing the semi-finished heating film.

[0026] Figure 5This is a schematic diagram of the structure with elastic structures inside the first and second frames.

[0027] Figure 6 This is a schematic diagram of the moving part. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 0 for heating film semi-finished product, 1 for encapsulation ink layer, 11 for first encapsulation ink layer, 12 for second encapsulation ink layer, 2 for electrode layer, 3 for heating ink layer, 4 for wire, 5 for first frame, 6 for second frame, 7 for roller gap, 8 for pressure roller, 9 for cutting table, 10 for moving part, 13 for release film, 14 for limiting part, 15 for limiting gap, 16 for cooling part, 17 for cooling gap, 18 for moving plate, 19 for fixed plate, 20 for compression spring, 21 for guide rod, 22 for cutting blade, and 23 for groove.

[0029] This embodiment prepares as follows: Figure 1 The diagram illustrates a graphene heating film comprising a first encapsulating ink layer 11, a second encapsulating ink layer 12, an electrode layer 2, and a heating ink layer 3. The first encapsulating ink layer 11, the heating ink layer 3, the electrode layer 2, and the second encapsulating ink layer 12 are fixed together. A wire 4 is connected to the electrode layer 2. In this embodiment, the electrode is a copper tape electrode. The first encapsulating ink layer 11 and the second encapsulating ink layer 12 are made of the same material. The encapsulating inks used in the first encapsulating ink layer 11 and the second encapsulating ink layer 12, as well as the heating inks used in the heating ink layer 3, are all disclosed in the prior art (application publication number CN117866482A). The encapsulating inks and heating inks in this prior art can be directly sampled, and will not be specifically described in this embodiment.

[0030] The preparation method of the graphene heating film described above is described in detail below.

[0031] In this embodiment, the graphene heating film is prepared using a roller drying device, combined with... Figure 2 As shown, the roller drying device includes a first frame 5, a second frame 6, a movable component 10, and multiple pressure rollers 8. The first frame 5 and the second frame 6 are arranged laterally opposite each other, with a vertical roller gap 7 between them. The width of the roller gap 7 is specifically set at 1 cm. The multiple pressure rollers 8 are rotatably connected to the sides of the roller gap 7 on the first frame 5 and the second frame 6 respectively via rotating shafts. The multiple pressure rollers 8 on the first frame 5 and the multiple pressure rollers 8 on the second frame 6 are vertically distributed. The pressure rollers 8 on the first frame 5 and the pressure rollers 8 on the second frame 6 are opposite each other. A placement platform is provided on the top of both the first frame 5 and the top of both the second frame 6.

[0032] This roller drying device has a heating and drying function, which can be achieved by the following means: hot air blowers are provided on the first frame 5 and the second frame 6, and the hot air blowers face the roller gap 7. Air outlets are provided on the right side of the first frame 5 and the left side of the second frame 6. In this way, hot air is blown out by the hot air blowers and blown out from the air outlets, thereby heating the roller gap 7; or, the inside of the pressure roller 8 has a heating chamber, which is equipped with heating wires or has a heating medium (such as steam or hot oil) to heat the pressure roller 8.

[0033] This roller press drying device has a cooling function, which can be achieved by the following means: cooling sections 16 are installed at the bottom of the first frame 5 and the bottom of the second frame 6, and a cooling gap 17 is provided between the two cooling sections 16, which is opposite to the roller press gap 7. The cooling section 16 is used for cooling, for example, by introducing cooling water into the chamber inside the cooling section 16 to achieve cooling.

[0034] The rolling device also includes a cutting table 9, which is located below the rolling gap 7. More specifically, the cutting table 9 is located below the cooling section 16. Two limiting parts 14 (specifically, limiting blocks) are fixedly installed on the cutting table 9, and a limiting gap 15 is formed between the two limiting parts 14. The limiting gap 15 is opposite to the rolling gap 7. In this embodiment, the width of the limiting gap 15 and the width of the cooling gap 17 are both equal to the width of the rolling gap 7. An upward-facing cutting blade 22 is fixedly provided on the top of the cutting table 9.

[0035] In this embodiment, the movable component 10 is specifically elongated (the cross-section can be circular, e.g., ...). Figure 6 (as shown), square or other shapes), the width of the moving part 10 on both sides is smaller than the width of the roller gap 7, and the bottom of the moving part 10 is provided with a groove 23, which is used to cooperate with the cutting blade 22. The moving part 10 is initially located above the roller gap 7 (as shown). Figure 2 As shown, the movable part 10 can move downwards into the roller gap 7, cooling gap 17, and limiting gap 15, and can move to the cutting table 9. The specific moving drive method of the movable part 10 can be vertically driven by a cylinder, hydraulic cylinder, etc. (moving blocks are fixed at both ends of the movable part 10, and the moving blocks slide vertically on the outer frame. A cylinder or hydraulic cylinder is installed on the frame. The moving blocks are driven by the cylinder or hydraulic cylinder, thereby driving the movable part 10 to move vertically). It can also be driven by a gear and rack. In this case, moving blocks are fixed at both ends of the movable part 10, the gear and rack mesh, the rack is vertically set on the outer frame, the moving blocks slide vertically on the frame, the rack and the movable part 10 are connected, and the motor and the gear are coaxially fixedly connected. In this way, the motor drives the gear to rotate, the gear drives the rack to move vertically, thereby driving the moving blocks to move vertically, and thus making the movable part 10 move vertically.

[0036] The basics are as follows: Figures 2-6 As shown: This embodiment discloses a method for preparing a graphene heating film, specifically including the following steps: S1, Combination Figure 2 , Figure 3 As shown, the release film 13 is laid flat on the placement platform of the first frame 5 and the placement platform of the second frame 6, and the area of ​​the release film 13 on the placement platform of the first frame 5 is equal to the area of ​​the release film 13 on the placement platform of the second frame 6; the encapsulation ink is applied (coated) to the surface of the release film 13 to form the encapsulation ink layer 1.

[0037] S2. The surface of the encapsulation ink layer 1 is divided into two regions, A and B (regions A and B are manually divided for ease of description; in actual implementation, they may not exist or may be marked as regions A and B). Region A is located on the placement platform of the first frame 5, and region B is located on the placement platform of the second frame 6. Electrodes and heating ink are applied to regions A and B of the encapsulation ink layer 1, respectively. In this embodiment, the heating ink is coated on region A, and the electrodes are placed on region B. The electrodes form electrode layer 2, and the heating ink forms heating ink layer 3. Thus, the release film 13, encapsulation ink layer 1, electrode layer 2, and heating ink layer 3 form a heating film semi-finished product 0.

[0038] S3. Move the moving part 10 downwards. In this embodiment, the downward movement speed of the moving part 10 is 1-2 m / min. The moving part 10 moves downwards from above the middle of the heating film semi-finished product 0. When the moving part 10 comes into contact with the heating film semi-finished product 0, as the moving part 10 continues to move downwards, the moving part 10 causes the middle of the heating film semi-finished product 0 to bend, and drives the heating film semi-finished product 0 into the roller gap 7. As the heating film semi-finished product 0 moves downwards, the heating film semi-finished product 0 is folded together. After the heating film semi-finished product 0 is folded together, the electrode layer 2 and the heating ink layer 3 are bonded together, and the release film 13 covers the outer surface of the heating film semi-finished product 0. Figure 4 As shown, the heating film semi-finished product 0 is folded in half and moves downward in the roller gap 7. The pressure rollers 8 on the first frame 5 and the second frame 6 roll the heating film semi-finished product 0 on both sides, thereby pressing the heating ink layer 3 and the encapsulation ink layer 1 (specifically the first encapsulation ink layer 11), the heating ink layer 3 and the electrode layer 2, and the electrode layer 2 and the encapsulation ink layer 1 (specifically the second encapsulation ink layer 12) together. At the same time, as the heating film semi-finished product 0 moves downward in the roller gap 7, the roller drying device heats the heating film semi-finished product 0 through a hot air blower or the pressure rollers 8, thereby drying the various layers of the heating film semi-finished product 0. In this embodiment, the drying temperature is 120°C.

[0039] Subsequently, the heating film semi-finished product 0 comes out from the roller gap 7 and enters the cooling gap 17, where the cooling section 16 cools down the heating film semi-finished product 0.

[0040] In this embodiment, to ensure that the pressure rollers 8 effectively compress the heating film semi-finished product 0, elastic structures are provided on both the first frame 5 and the second frame 6. These structures compress the pressure rollers 8, allowing the heating film semi-finished product 0 to enter between the two pressure rollers 8. The two pressure rollers 8 can then retract, thus avoiding obstruction of the heating film semi-finished product 0 from entering between them. Simultaneously, the two pressure rollers 8 apply pressure to the heating film semi-finished product 0 under the elastic force of the elastic structures, performing roll compression. The elastic structures are specifically combined with… Figure 5 As shown, the elastic structure on the first frame 5 is the same as the elastic structure on the second frame 6. Taking the elastic structure on the first frame 5 as an example, the elastic structure specifically includes a movable plate 18 that can slide laterally and a fixed plate 19 fixed on the first frame 5. The fixed plate 19 is located to the left of the movable plate 18. The movable plate 18 is laterally slidably connected to the first frame 5 through a sliding groove and a slider. A guide rod 21 is welded and fixed to the left side of the movable plate 18. The guide rod 21 is laterally slidably connected to the lateral rod hole of the fixed plate 19. A compression spring 20 is fixed on the guide rod 21 and is sleeved on the guide rod 21. In this way, the heating film semi-finished product 0 enters the two pressure rollers 8. The heating film semi-finished product 0 squeezes the two pressure rollers 8. The movable plate 18 moves towards the fixed plate 19. The pressure rollers 8 avoid the heating film semi-finished product 0 and the movable part 10. At the same time, the heating film semi-finished product 0 enters between the two pressure rollers 8. The pressure rollers 8 squeeze the heating film semi-finished product 0 under the elastic force of the compression spring 20. Because the pressure rollers 8 on both sides can move left and right, they can adapt to heating film semi-finished products 0 of different thicknesses. Of course, all the pressure rollers 8 can be installed simultaneously on the same movable plate 18, or each pressure roller 8 can be installed with a corresponding movable plate 18, or one movable plate 18 can be installed for every 2-N pressure rollers 8. Figure 5 In the middle, three pressure rollers 8 are installed on a moving plate 18 (two vertically adjacent moving plates 18 are set to slide relative to each other), and these can be set according to the actual situation and the extrusion effect. Figure 5 The diagram illustrates that both the first frame 5 and the second frame 6 are equipped with elastic structures. Of course, in other embodiments, the elastic structure can be provided on one of the first frame 5 and the second frame 6, while the other frame does not have an elastic structure. It is easy to understand that by selecting a suitable compression spring or controlling the compression amount of the compression spring, the pressure of the pressure roller on the semi-finished heating film 0 can be made moderate.

[0041] S4. Then, as the moving part 10 continues to move downward, the heating film semi-finished product 0 comes out from the cooling gap 17 and moves downward into the limiting gap 15. Finally, the moving part 10 moves to the cutting table 9, and the cutting blade 22 on the top of the cutting table 9 is inserted into the groove 23 at the bottom of the moving part 10. The cutting blade 22 cuts the encapsulation ink layer 1 and the release film 13. Then, the heating film semi-finished product 0 is pulled upward, thereby separating the heating film semi-finished product 0 from the moving part 10. The release film 13 on the surface of the heating film semi-finished product 0 is peeled off, and finally the graphene heating film is obtained.

[0042] In addition, to further improve the preparation efficiency of graphene heating films, in other embodiments, multiple roller pressing and drying devices can be set up, with the roller gaps 7 of the multiple roller pressing and drying devices arranged opposite to each other (the multiple roller pressing and drying devices are in... Figure 2 (Distributed perpendicular to the paper surface), such that when a moving part 10 moves downward, it can simultaneously pass through multiple roller gaps 7, thereby driving the heating film semi-finished products 0 on different roller drying devices downward. Alternatively, the area of ​​the placement platform of the first frame 5 and the second frame 6 of the roller drying device can be increased, so that multiple heating film semi-finished products 0 can be placed on the placement platform of the first frame 5 and the second frame 6 (multiple heating film semi-finished products 0 in...) Figure 2 (Distributed perpendicular to the paper surface), when the moving part 10 moves downward, it can simultaneously drive multiple heating film semi-finished products 0 into the roller gap 7 for drying and roller pressing.

[0043] The heating film prepared in this embodiment was subjected to an electrical test, and the test results showed that the heating film could generate heat and be used normally after being powered on.

[0044] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a graphene heating film, characterized in that: Includes the following steps: S1. Apply the encapsulation ink to the surface of the release film to form an encapsulation ink layer; S2. The surface of the encapsulation ink layer is divided into two regions, A and B. Electrodes and heating ink are applied to regions A and B of the encapsulation ink layer respectively. The electrodes form an electrode layer, and the heating ink forms a heating ink layer. The release film, encapsulation ink layer, electrode layer, and heating ink layer form a heating film semi-finished product. S3. Fold the heating film semi-finished product in half to make the electrode layer and the heating ink layer adhere together, and cover the outer surface of the heating film semi-finished product with release film; then dry and roll the heating film semi-finished product. S4. Remove the release film to obtain the graphene heating film.

2. The method for preparing a graphene heating film according to claim 1, characterized in that: Step S3 is completed on the roller drying device; The roller drying device includes a first frame, a second frame, a movable component, and multiple pressure rollers. A vertical roller gap exists between the first frame and the second frame. The multiple pressure rollers are respectively disposed on the side of the roller gap between the first frame and the second frame. The multiple pressure rollers on the first frame and the multiple pressure rollers on the second frame are both vertically distributed. The pressure rollers on the first frame and the pressure rollers on the second frame are opposite to each other. A placement platform is provided at the top of both the first frame and the top of the second frame. In S1, the release film is laid on the first frame placement platform and the second frame placement platform; In S2, regions A and B are located on the placement platform of the first rack and the placement platform of the second rack, respectively. In S3, the moving part moves downward from above the middle of the heating film semi-finished product and drives the heating film semi-finished product to be folded in half and enter the roller pressing gap together; the pressure roller presses the folded heating film semi-finished product.

3. The method for preparing a graphene heating film according to claim 2, characterized in that: Both the first and second frames are equipped with hot air blowers, which face the roller gap; or, The pressure roller has a heating chamber inside, which contains heating wires or a heating medium.

4. The method for preparing a graphene heating film according to claim 2, characterized in that: The roller pressing device also includes a cutting table with a cutting blade, and the cutting table is located below the roller pressing gap; The moving part moves to the cutting table, and the cutting blade cuts the heating film semi-finished product.

5. The method for preparing a graphene heating film according to claim 4, characterized in that: The moving part is long and narrow.

6. The method for preparing a graphene heating film according to claim 2, characterized in that: The bottom of the first frame and the bottom of the second frame are both provided with cooling sections, and a cooling gap is provided between the two cooling sections. The cooling gap and the rolling gap are opposite to each other.

7. The method for preparing a graphene heating film according to claim 4, characterized in that: The cutting table is provided with two limiting parts, and there is a limiting gap between the two limiting parts. The limiting gap is opposite to the roller pressing gap.

8. The method for preparing a graphene heating film according to claim 1, characterized in that: The drying temperature is 120℃.

9. The method for preparing a graphene heating film according to claim 2, characterized in that: The moving speed of the moving part is 1-2 m / min.

10. A graphene heating film, characterized in that: It is prepared by the method for preparing a graphene heating film according to claims 1-9.

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