High-conductivity and high-thermal-conductivity electrothermal film material and preparation method thereof

Abstract

The invention relates to the field of electrothermal materials, and discloses a high-conductivity and high-thermal-conductivity electrothermal film material and a preparation method thereof, and the electrothermal film material comprises a first insulation packaging layer, a polymer composite conductive layer, an end electrode and a second insulation packaging layer; the polymer composite conductive layer is arranged between the first insulation packaging layer and the second insulation packaging layer, and two end parts of the polymer composite conductive layer are provided with end electrodes; the polymer composite conductive layer comprises a porous loose carbon stacking layer and a polymer main body material embedded into the porous loose carbon stacking layer. The carbon conductive material in the electrothermal film material is good in continuity, the electronic conductivity of the electrothermal film material can be remarkably improved, the driving voltage of the electrothermal film material is reduced, and the high thermal conductivity of the carbon conductive material is also beneficial for increasing the temperature rise speed and improving the thermal stability of the material.

Description

Technical Field

[0001] The invention relates to the field of electric heating materials, and in particular to an electric heating film material with high electrical conductivity and high thermal conductivity and a preparation method thereof. Background Art

[0002] Common electric heating materials are metal-based electric heating materials and ceramic-based electric heating materials. These two types of electric heating materials are mostly used in high-power heating devices. However, for heating devices that only require medium and low power heating, the functionality of common electric heating materials is very limited, and they perform poorly in some aspects, such as lightness and thinness in weight and volume, and heating coverage.

[0003] Electric heating film materials are usually two-dimensional functional film materials with conductive polymer composite materials as the main body. A conductive network formed by a conductive agent is distributed in the polymer structure. When current is passed through the conductive polymer composite film material, Joule heating effect will be generated, thereby emitting heat to the external environment.

[0004] Conductive polymer composite materials often require higher voltage to drive their operation due to their low conductivity. However, higher voltage is more likely to cause safety accidents. On the contrary, low voltage driving is conducive to mobile power devices as direct power supply devices, such as some chemical batteries.

[0005] At the same time, the thermal conductivity of conductive polymer composite materials is related to whether the material can generate heat efficiently, and it also affects the structural stability of the material. The lower thermal conductivity makes it easy for the electric heating film material to cause local heat aggregation of the polymer main material in the heating state, resulting in film softening and structural failure. Summary of the invention

[0006] To solve the existing problems, the present invention provides a reasonably designed, practical and convenient high electrical conductivity and high thermal conductivity electric heating film material, aiming to solve the problems of low electrical conductivity, low thermal conductivity and high working voltage of the current electric heating film material.

[0007] In order to achieve the above object, the present invention provides the following technical solutions.

[0008] A high electrical conductivity and high thermal conductivity electric heating film material, comprising a first insulating packaging layer, a polymer composite conductive layer, a terminal electrode and a second insulating packaging layer; the polymer composite conductive layer is arranged between the first insulating packaging layer and the second insulating packaging layer, and the terminal electrodes are arranged at two ends of the polymer composite conductive layer; the polymer composite conductive layer comprises a porous loose carbon stacking layer and a polymer main material embedded in the porous loose carbon stacking layer.

[0009] As a further improvement of the present invention, the first insulating packaging layer and the second insulating packaging layer are both made of one or more of nylon, polyethylene terephthalate, high-density polyethylene, and polypropylene.

[0010] As a further improvement of the present invention, the thickness of the first insulating packaging layer and the second insulating packaging layer are both 10-100 μm.

[0011] As a further improvement of the present invention, the terminal electrode is made of one or more of copper, aluminum or nickel metals; the terminal electrode and the polymer composite conductive layer are connected via a conductive silver paste layer or a conductive copper paste layer.

[0012] As a further improvement of the present invention, the thickness of the polymer composite conductive layer is 10 to 200 μm.

[0013] As a further improvement of the present invention, the polymer main material is one or more of polyethylene oxide, thermoplastic polyurethane elastomer, polydimethylsiloxane, polyvinylidene fluoride, polymethyl methacrylate, and polyacrylic acid.

[0014] As a further improvement of the present invention, the porous loose carbon stacking layer includes a carbon conductive material; the carbon conductive material is one or more of carbon nanotubes, graphite, acetylene black, graphene, and carbon fiber. The present invention also discloses a method for preparing a high electrical conductivity and high thermal conductivity electric heating film material, comprising the following steps: S1: dispersing the carbon conductive material in a carbon material dispersant, adding an appropriate amount of additives, and then sequentially performing mechanical stirring and ultrasonic vibration to form a carbon material suspension; S2: filtering the obtained carbon material suspension to remove the carbon material dispersant by suction filtration, and drying to obtain a porous loose carbon stacking layer; S3: adding the polymer main material into the polymer solvent, heating and stirring to completely dissolve the polymer main material to form a polymer main solution; S4: completely infiltrating the obtained porous loose carbon stacking layer with the polymer main solution, and performing drying treatment to obtain a conductive polymer composite layer; S5: attaching copper, aluminum or nickel metal strips to both ends of the conductive polymer composite layer by means of conductive silver paste or conductive copper paste; S6: One or more of nylon, polyethylene terephthalate, high-density polyethylene, and polypropylene are coated on both sides of the conductive polymer composite layer with electrodes attached thereto through a hot pressing process to form a first insulating packaging layer and a second insulating packaging layer.

[0015] As a further improvement of the present invention, The solid content of the conductive carbon material in the carbon material dispersant in S1 is 2 to 20%; The drying process in S1 and S2 is carried out at a temperature of 50 to 150°C and for a time of 0.5 to 6 h; The solid content of the polymer main material in the polymer solvent described in S3 is 5 to 25%; The heating and stirring temperature in S3 is 60-90° C., and the stirring speed is 300-1200 rpm; The drying process in S4 is performed at a temperature of 50 to 90°C for a period of 3 to 12 hours; The processing temperature of the hot pressing process in S6 is 100-150°C.

[0016] As a further improvement of the present invention, the carbon material dispersant is one or more of acetonitrile, propylene glycol, N-methylpyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide, ethanol, isopropanol, tetrahydrofuran, and distilled water.

[0017] The present invention has the following beneficial effects: The present invention effectively improves the safety and reliability of the material by providing the first insulating packaging layer and the second insulating packaging layer, and prevents the risk of leakage and short circuit during the electric heating process. The design of the polymer composite conductive layer, especially the combination of the porous loose carbon stacking layer and the polymer main material, not only improves the conductive performance, but also enhances the mechanical strength and durability of the material.

[0018] Optionally, nylon, polyethylene terephthalate, high-density polyethylene, polypropylene, etc. are selected as the insulating packaging layer material to ensure the insulation performance and heat resistance of the material. At the same time, these materials also have good processing performance and cost-effectiveness.

[0019] Optionally, the thickness of the insulating packaging layer is controlled within the range of 10 to 100 μm, which not only ensures sufficient insulation strength and ensures that the electric heating film will not have problems such as leakage and thermal runaway during operation, but also avoids material waste and reduced heating efficiency caused by excessive thickness.

[0020] Preferably, copper, aluminum or nickel metals are used as terminal electrode materials. These materials have good electrical conductivity and mechanical strength, and can ensure the stability and reliability of the electric heating film during long-term operation.

[0021] Preferably, the thickness of the polymer composite conductive layer is controlled within the range of 10 to 200 μm, which not only ensures sufficient conductivity and reduces heating time, but also avoids material waste and uneven heating caused by excessive thickness.

[0022] Preferably, polyethylene oxide, thermoplastic polyurethane elastomer, polydimethylsiloxane, polyvinylidene fluoride, polymethyl methacrylate, polyacrylic acid, etc. are selected as the main polymer materials. These materials not only have good electrical conductivity, but also have certain flexibility and corrosion resistance, and can adapt to different working environments.

[0023] Preferably, carbon nanotubes, graphite, acetylene black, graphene, carbon fiber, etc. are used as materials for the porous loose carbon stacking layer. These materials have high electrical conductivity and high thermal conductivity, and can significantly improve the heating efficiency and temperature uniformity of the electric heating film.

[0024] The preparation method has clear steps and is easy to operate, and can effectively prepare an electric heating film material with high electrical conductivity and high thermal conductivity. Through mechanical stirring and ultrasonic vibration and other steps, the uniform dispersion of the carbon conductive material in the carbon material dispersant is ensured, and the conductive performance of the porous loose carbon stacking layer is improved. The insulating encapsulation layer is coated on both sides of the conductive polymer composite layer through a hot pressing process, ensuring the integrity and stability of the material.

[0025] Preferably, various parameters in the preparation process are strictly controlled, such as the solid content of the conductive carbon material, the temperature and time of the drying treatment, the solid content of the polymer main material, the temperature and speed of the heating and stirring, etc. The optimization of these parameters ensures the performance stability and consistency of the electric heating film material.

[0026] Preferably, acetonitrile, propylene glycol, N-methylpyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide, ethanol, isopropanol, tetrahydrofuran, distilled water, etc. are selected as carbon material dispersants. These reagents can effectively disperse carbon conductive materials and will not chemically react with the polymer main material, thereby ensuring the preparation quality and performance of the electric heating film material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 It is a schematic structural diagram of a high electrical conductivity and high thermal conductivity electric heating film material described in an embodiment; Figure 2 This is an infrared imaging image of a high electrical conductivity and high thermal conductivity electric heating film material described in an embodiment generating heat under a 3 V DC voltage; Figure 3 The temperature variation curve of a high electrical conductivity and high thermal conductivity electric heating film material under a 5 V DC voltage as a function of time described in the embodiment; Among them, 1. a first insulating packaging layer; 2. a conductive polymer composite layer; 3. terminal electrodes; 4. a second insulating packaging layer. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] Example 1 like Figure 1 As shown, the present invention discloses a high electrical conductivity and high thermal conductivity electric heating film material, comprising a first insulating packaging layer 1, a polymer composite conductive layer, a terminal electrode 3 and a second insulating packaging layer 4; the polymer composite conductive layer is arranged between the first insulating packaging layer 1 and the second insulating packaging layer 4, and the terminal electrodes 3 are arranged at both ends of the polymer composite conductive layer; the polymer composite conductive layer comprises a porous loose carbon stacking layer and a polymer main body material embedded in the porous loose carbon stacking layer. The thickness of the first insulating packaging layer 1 and the second insulating packaging layer 4 is 20μm, and the thickness of the polymer composite conductive layer is 50μm.

[0032] The preparation method of the electric heating film material comprises the following specific steps: Step 1: Disperse 0.05 g of graphene, 0.05 g of carbon nanotubes, and 0.1 g of acetylene black in 4 ml of acetonitrile, and add 0.05% trifluoroacetic acid as an additive, then stir at 500 rpm for 1 h and ultrasonicate for 20 min to form a carbon material suspension.

[0033] Step 2: The carbon material suspension obtained in step 1 is filtered to remove most of the acetonitrile, and then dried at 60° C. for 6 h to obtain a porous loose carbon stacking layer.

[0034] The carbon conductive material in the porous loose carbon stacking layer obtained by the filtration method has good continuity, which can significantly improve the electronic conductivity of the electric heating film material and reduce the driving voltage of the electric heating film material. The rated power and heating power can be achieved through a handheld mobile power source (such as a power bank, battery, etc.).

[0035] The continuously distributed carbon material is beneficial to improving the thermal conductivity of the electric heating film material, quickly transferring the heat inside the material to the surface or the object to be heated, slowing down the softening of the polymer main material caused by local heat accumulation, and improving the thermal stability of the material.

[0036] Step 3: Add 0.5 g of polyethylene oxide (PEO) to 5 ml of acetonitrile, heat and stir at 60 °C for 6 h at a speed of 400 rpm to completely dissolve PEO and form a polymer main solution.

[0037] Step 4: The PEO solution is completely infiltrated into the porous loose carbon stacking layer, scraped flat, spread on the surface of the polytetrafluoroethylene plate, and dried at 50°C for 12 h to obtain a conductive polymer composite layer 2 with a thickness of about 50 μm, and cut it into 3 cm×6 cm.

[0038] Step 5: Attach the copper metal strips to both ends of the conductive polymer composite layer 2 using conductive silver paste, and dry the conductive silver paste in a forced air oven at 80°C.

[0039] Step 6: High-density polyethylene (HDPE) is hot-pressed at 120° C. to cover both sides of the conductive polymer composite layer 2 with electrodes attached thereto, so as to form a first insulating packaging layer 1 and a second insulating packaging layer 4 .

[0040] High-density polyethylene has excellent electrical insulation properties and can withstand high voltages without breakdown or leakage. HDPE is insoluble in any organic solvent at room temperature and can resist corrosion from acids, alkalis, strong oxidants (such as concentrated nitric acid) and various salts. HDPE has a high melting point (generally 142°C) and a higher decomposition temperature (300°C), so it has good heat resistance.

[0041] The structure of a high electrical conductivity and high thermal conductivity electric heating film material obtained in Example 1 is as follows Figure 1 As shown, infrared imaging under 3V DC voltage is as follows Figure 2 As shown, the heating temperature is 45° C., wherein the sheet resistance of the porous loose carbon stack layer is measured to be 5.1 Ω, and the thermal conductivity of the conductive polymer composite layer 2 is 5.2 W / m·k.

[0042] Example 2 Embodiment 2 discloses a high electrical conductivity and high thermal conductivity electric heating film material, comprising a first insulating packaging layer 1, a polymer composite conductive layer, a terminal electrode 3 and a second insulating packaging layer 4; the polymer composite conductive layer is arranged between the first insulating packaging layer 1 and the second insulating packaging layer 4, and the terminal electrodes 3 are arranged at both ends of the polymer composite conductive layer; the polymer composite conductive layer comprises a porous loose carbon stacking layer and a polymer main body material embedded in the porous loose carbon stacking layer. The thickness of the first insulating packaging layer 1 and the second insulating packaging layer 4 is 40μm, and the thickness of the polymer composite conductive layer is 60μm.

[0043] The preparation method of the electric heating film material comprises the following specific steps: Step 1: Disperse 0.02 g of graphene, 0.1 g of carbon fiber, and 0.15 g of acetylene black in 5 ml of N-methylpyrrolidone (NMP), and add 0.02% of trifluoroacetic acid as an additive. Then stir at 800 rpm for 0.5 h and ultrasonicate for 15 min to form a carbon material suspension.

[0044] Step 2: The carbon material suspension obtained in step 1 is filtered to remove most of the NMP solvent, and then dried at 90° C. for 4 h to obtain a porous loose carbon stacking layer.

[0045] Step 3: Add 0.8 g of thermoplastic polyurethane elastomer (TPU) into 5 ml of NMP, heat and stir at 80 °C for 6 h at a speed of 800 rpm to completely dissolve the TPU and form a polymer main solution.

[0046] TPU is added to the electric heating film as a polymer main material. When the TPU solution completely infiltrates and fills the porous loose carbon stacking layer, after drying, the TPU will solidify and fill the pores in the stacking layer to form a conductive polymer composite layer 2. This layer not only provides the necessary structural support, but also ensures the mechanical strength and flexibility of the electric heating film.

[0047] Step 4: The TPU solution is completely infiltrated into the porous loose carbon stacking layer, scraped flat, spread on the surface of the polytetrafluoroethylene plate, and dried at 70°C for 8 h to obtain a conductive polymer composite layer 2 with a thickness of about 60 μm, and cut into 4 cm × 5 cm.

[0048] Step 5: Attach the nickel metal strips to both ends of the conductive polymer composite layer 2 through conductive silver paste, and dry the conductive silver paste in a 70° C. forced air oven.

[0049] Step 6: heat-press polypropylene (PP) at 100° C. to cover both sides of the conductive polymer composite layer 2 with electrodes attached thereto, so as to form a first insulating packaging layer 1 and a second insulating packaging layer 4 .

[0050] The high electrical conductivity and high thermal conductivity electric heating film material obtained in Example 2 has a heating temperature of 55°C under a 5 V DC voltage, and the temperature variation curve over time is as follows: Figure 3 As shown, the measured sheet resistance of the porous loose carbon stack layer is 7.4 Ω, and the thermal conductivity of the conductive polymer composite layer 2 is 4.9 W / m·k.

[0051] Example 3 Embodiment 3 discloses a high electrical conductivity and high thermal conductivity electric heating film material, comprising a first insulating packaging layer 1, a polymer composite conductive layer, a terminal electrode 3 and a second insulating packaging layer 4; the polymer composite conductive layer is arranged between the first insulating packaging layer 1 and the second insulating packaging layer 4, and the terminal electrodes 3 are arranged at both ends of the polymer composite conductive layer; the polymer composite conductive layer comprises a porous loose carbon stacking layer and a polymer main body material embedded in the porous loose carbon stacking layer. The thickness of the first insulating packaging layer 1 and the second insulating packaging layer 4 is 50μm, and the thickness of the polymer composite conductive layer is 50μm.

[0052] The preparation method of the electric heating film material comprises the following specific steps: Step 1: Disperse 0.1 g of carbon nanotubes and 0.2 g of acetylene black in 3.5 ml of isopropanol, and add 0.04% trifluoroacetic acid as an additive, then stir at 600 rpm for 1.5 h and ultrasonicate for 30 min to form a carbon material suspension.

[0053] Acetylene black is a spherical nanoparticle in powder form, not in lamellar form, with a large specific surface area, but its conductivity is very good. Acetylene black is a zero-dimensional material, and carbon nanotubes are two-dimensional materials. The interweaving of the two not only significantly improves the conductivity, but also helps to form a carbon stacking layer with a large number of pores. These pores help to increase the specific surface area and adsorption capacity of the material, which is conducive to the full infiltration of the polymer main material.

[0054] Step 2: The carbon material suspension obtained in step 1 is filtered to remove most of the isopropanol solvent, and then dried at 70° C. for 2 h to obtain a porous loose carbon stacking layer.

[0055] Step 3: Add 1 g of polyacrylic acid (PAA) to 9 ml of N,N-dimethylacetamide (DMAC), heat and stir at 80°C for 6 h at a speed of 900 rpm to completely dissolve PAA and form a polymer main solution.

[0056] Step 4: The PAA solution is completely infiltrated into the porous loose carbon stacking layer, scraped flat, spread on the surface of the polytetrafluoroethylene plate, and dried at 80°C for 12 h to obtain a conductive polymer composite layer 2 with a thickness of about 50 μm, and cut into 4 cm×5 cm.

[0057] Step 5: Attach the aluminum metal strips to both ends of the conductive polymer composite layer 2 through conductive copper paste, and dry the conductive copper paste in a 70° C. forced air oven.

[0058] Step 6: Heat-press the nylon at 130° C. to cover both sides of the conductive polymer composite layer 2 with electrodes attached thereto, so as to form a first insulating packaging layer 1 and a second insulating packaging layer 4 .

[0059] The high electrical conductivity and high thermal conductivity electric heating film material obtained in Example 3 has a heating temperature of 65°C under a DC voltage of 5 V, wherein the sheet resistance of the porous loose carbon stack layer is measured to be 6.8 Ω, and the thermal conductivity of the conductive polymer composite layer 2 is 4.4 W / m·k.

[0060] A method for using a high electrical conductivity and high thermal conductivity electric heating film material in this embodiment is as follows: First, make sure the terminal electrode 3 (copper, aluminum or nickel metal strip) of the electric heating film is properly connected to the power supply. Use appropriate wires and connectors to ensure a safe and reliable electrical connection.

[0061] The voltage, current or power parameters of the power supply are set according to the size of the object or environment space to be heated, the required temperature and the heating rate.

[0062] Turn on the power and the electric heating film will start working, converting electrical energy into heat energy.

[0063] During the heating process, a temperature sensor or other monitoring device can be used to detect the temperature in real time and adjust it as needed. If the temperature is too high or too low, it can be corrected by adjusting the power supply parameters.

[0064] When the required temperature is reached or the heating task is completed, turn off the power in time to prevent overheating or waste of energy.

[0065] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high electrical conductivity and high thermal conductivity electric heating film material, characterized in that: The invention comprises a first insulating packaging layer (1), a polymer composite conductive layer, a terminal electrode (3) and a second insulating packaging layer (4); the polymer composite conductive layer is arranged between the first insulating packaging layer (1) and the second insulating packaging layer (4), and the terminal electrodes (3) are arranged at two ends of the polymer composite conductive layer; the polymer composite conductive layer comprises a porous loose carbon stacking layer and a polymer main body material embedded in the porous loose carbon stacking layer.

2. The high electrical conductivity and high thermal conductivity electric heating film material according to claim 1, characterized in that: The first insulating packaging layer (1) and the second insulating packaging layer (4) are both made of one or more of nylon, polyethylene terephthalate, high-density polyethylene, and polypropylene.

3. The high electrical conductivity and high thermal conductivity electric heating film material according to claim 1, characterized in that: The thickness of the first insulating packaging layer (1) and the second insulating packaging layer (4) are both 10 to 100 μm.

4. The high electrical conductivity and high thermal conductivity electric heating film material according to claim 1, characterized in that: The terminal electrode (3) is made of one or more of copper, aluminum or nickel metals.

5. The high electrical conductivity and high thermal conductivity electric heating film material according to claim 1, characterized in that: The thickness of the polymer composite conductive layer is 10 to 200 μm.

6. The high electrical conductivity and high thermal conductivity electric heating film material according to claim 1, characterized in that: The polymer main material is one or more of polyethylene oxide, thermoplastic polyurethane elastomer, polydimethylsiloxane, polyvinylidene fluoride, polymethyl methacrylate, and polyacrylic acid.

7. The high electrical conductivity and high thermal conductivity electric heating film material according to claim 1, characterized in that: The porous loose carbon stacking layer includes a carbon conductive material; the carbon conductive material is one or more of carbon nanotubes, graphite, acetylene black, graphene, and carbon fiber.

8. A method for preparing an electric heating film material with high electrical conductivity and high thermal conductivity according to any one of claims 1 to 7, characterized in that: The steps include: S1: dispersing the carbon conductive material in a carbon material dispersant, adding an appropriate amount of additives, and then sequentially performing mechanical stirring and ultrasonic vibration to form a carbon material suspension; S2: filtering the obtained carbon material suspension to remove the carbon material dispersant by suction filtration, and drying to obtain a porous loose carbon stacking layer; S3: adding the polymer main material into the polymer solvent, heating and stirring to completely dissolve the polymer main material to form a polymer main solution; S4: completely infiltrating the obtained porous loose carbon stacking layer with the polymer main solution, and performing drying treatment to obtain a conductive polymer composite layer (2); S5: attaching copper, aluminum or nickel metal strips to both ends of the conductive polymer composite layer (2) using conductive silver paste or conductive copper paste; S6: One or more of nylon, polyethylene terephthalate, high-density polyethylene, and polypropylene are coated on both sides of the conductive polymer composite layer (2) with electrodes attached thereto through a hot pressing process to form a first insulating packaging layer (1) and a second insulating packaging layer (4).

9. The method for preparing a high electrical conductivity and high thermal conductivity electric heating film material according to claim 8, characterized in that: The solid content of the conductive carbon material in the carbon material dispersant in S1 is 2 to 20%; The drying process in S1 and S2 is carried out at a temperature of 50 to 150°C and for a time of 0.5 to 6 h; The solid content of the polymer main material in the polymer solvent described in S3 is 5 to 25%; The heating and stirring temperature in S3 is 60 to 90° C., and the stirring speed is 300 to 1200 rpm; The drying process in S4 is performed at a temperature of 50 to 90°C for a period of 3 to 12 hours; The processing temperature of the hot pressing process in S6 is 100-150°C.

10. A method for preparing an electric heating film material with high electrical conductivity and high thermal conductivity according to claim 8, characterized in that: The carbon material dispersant is one or more of acetonitrile, propylene glycol, N-methylpyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide, ethanol, isopropanol, tetrahydrofuran, and distilled water.

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