Continuous carbon nanotube heating film material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of heating film materials, in particular to a continuous carbon nanotube heating material and a preparation method and application thereof. Comprising a base film, a conductive layer and an electrode. The carbon nano tube is used as a conductive main body, is fast in heating and low in power, and is mainly applied to the field of energy storage, such as heat preservation, new energy power batteries, energy-saving transformation and the like.

Description

Technical Field

[0001] This application relates to the technical field of heating film materials, and more specifically, to a continuous carbon nanotube heating film material, its preparation method and applications. Background Art

[0002] As a new type of heating material, carbon nanotube heating materials have the characteristics of fast, efficient, and uniform heating. Usually, carbon nanotubes are used as heat conduction elements to achieve heating through current drive. Compared with traditional metal heating materials, carbon nanotube heating materials have better heat conduction performance and higher corrosion resistance, and can operate stably in harsh environments. At the same time, they are also flexible, thin, and light, and can be widely used in various energy-saving fields such as medical, automotive, and household appliances, with broad market prospects.

[0003] However, there is still room for improvement in the preparation process, material property optimization, and application adaptability of existing carbon nanotube heating materials, such as optimizing the composition ratio of the conductive layer, selecting the material of the coating layer, and the electrode connection method, etc., to further improve its heating efficiency, stability, and service life. Summary of the Invention

[0004] This application provides a continuous carbon nanotube heating film material, its preparation method and applications, aiming to optimize the structure and performance of the heating film material, improve heating efficiency, stability, and service life, and at the same time make it more adaptable to the application scenarios in the energy storage field.

[0005] To achieve the above object, this application provides a continuous carbon nanotube heating film material, including a first base film, a second base film, a conductive layer, and electrodes.

[0006] Further, the conductive layer is coated on the first base film.

[0007] Further, the electrodes are located on the first base film and the conductive layer.

[0008] Further, the second base film is located on the conductive layer and the electrodes.

[0009] Further, the first and second base films are preferably PET films.

[0010] Further, for the conductive layer, by mass, the raw materials include: 3 - 6 parts of continuous carbon nanotubes, 30 - 60 parts of graphite, 1 - 2 parts of dispersant, 100 - 200 parts of deionized water, 2 - 4 parts of adhesive, and 2 - 4 parts of adsorbent;

[0011] Further, the electrodes are preferably copper strips.

[0012] Further, the dispersant is one or a combination of two of sodium carboxymethyl cellulose and polyvinylpyrrolidone.

[0013] Further, the adhesive is one or a combination of two of polyvinyl alcohol and hydroxyethyl cellulose.

[0014] Further, the adsorbent is an aqueous adsorbent, which is one or a combination of two of activated carbon and diatomite.

[0015] Further, the thickness of the conductive layer is 50 - 100 μm.

[0016] In addition, the present application also provides a preparation method of a continuous carbon nanotube heating film material, which is characterized by including the following steps:

[0017] Step 1: Add carbon nanotubes, graphite, a dispersant, a binder, and an adsorbent into deionized water according to a ratio, mix evenly, and filter to obtain a black slurry.

[0018] Step 2: Cut the base film into a first base film and a second base film of required specifications, and perform surface cleaning treatment on the first base film.

[0019] Step 3: Use a spraying device to evenly spray the slurry obtained in Step 1 on the first base film, and dry it to form a conductive layer.

[0020] Step 4: Paste electrodes on the first base film and the conductive layer to obtain a composite material.

[0021] Step 5: Paste the second base film on the composite material.

[0022] Step 6: Paste terminal heads on both sides of the base film respectively, and encapsulate to obtain a continuous carbon nanotube heating film material.

[0023] Further, Step 2 further includes: after the surface cleaning treatment of the first base film, paste paper tapes on both sides of the first base film, covering 3 - 3.5 cm of the edge of the first base film.

[0024] Further, in Step 4, the step of pasting the electrodes on the first base film and the conductive layer includes: tear off the paper tapes on both sides of the first base film, clean them up, cut the electrodes into long electrodes and short electrodes, paste the long electrodes in the exact middle of the blank on both sides of the base film, paste the short electrodes on the conductive layer at intervals, and make the short electrodes perpendicular to the long electrodes to obtain a composite material.

[0025] Further, in Step 4, the length of the long electrode is equal to that of the first base film, and the interval distance of the short electrodes is preferably 1 / 10 of the length of the long electrode.

[0026] Further, in step 3, the spraying thickness is 50 - 100 μm, and the drying conditions are: the drying temperature is 60 - 80°C, and the drying time is 0.5 - 2 hours.

[0027] In addition, the present application also provides an application of the continuous carbon nanotube heating film material in the field of energy storage.

[0028] The continuous carbon nanotube heating film material and its preparation method provided by the present invention have the following beneficial effects:

[0029] 1. Fast heating speed: Using carbon nanotubes as the main conductive material, it has excellent electrical conductivity and thermal conductivity, and can achieve rapid heating in a short time, meeting the requirements of the energy storage field for rapid temperature response.

[0030] 2. Low power: By optimizing the composition ratio and structural design of the conductive layer, while ensuring the heating effect, the energy consumption is reduced, which is suitable for application scenarios with strict power requirements such as energy-saving transformation.

[0031] 3. Strong application adaptability: The PET film of the base film layer has good flexibility and processability, and can be customized according to the shape, size and power requirements of different energy storage devices, having a wide application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of this application are used to provide a further understanding of this application, making other features, objects and advantages of this application more obvious. The schematic embodiments and their descriptions of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0033] Figure 1 is a schematic diagram of the continuous carbon nanotube heating film material provided by the embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0035] It should be noted that in the description and claims of this application and the above-mentioned drawings, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances for the embodiments of this application described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0036] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements, or components must have a specific orientation or be constructed and operated in a specific orientation.

[0037] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0038] In addition, the meaning of the term "plurality" should be two or more.

[0039] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0040] Embodiment 1

[0041] The embodiment of this application provides a continuous carbon nanotube heating material, including a first base film, a second base film, a conductive layer, and an electrode. Among them, the first and second base films are PET films; the raw materials of the conductive layer, by mass, include: 3 parts of continuous carbon nanotubes, 30 parts of graphite, 1 part of sodium carboxymethyl cellulose, 100 parts of deionized water, 2 parts of polyvinyl alcohol, and 2 parts of activated carbon; the electrode is a copper strip.

[0042] The preparation method of the continuous carbon nanotube heating material in this embodiment includes the following steps:

[0043] Step 1: Add carbon nanotubes, graphite, sodium carboxymethyl cellulose, polyvinyl alcohol, and activated carbon into deionized water according to the ratio, mix evenly, and filter to obtain a black slurry.

[0044] Step 2: Cut the PET film into a first PET film and a second PET film. The sizes of the first and second PET films are 0.6 m × 2.0 m. Perform surface cleaning treatment on the first PET film, and then stick 2 m long paper tapes on both sides, covering 3 cm of the edges of the first PET film.

[0045] Step 3: Use a spraying device to evenly spray the slurry obtained in Step 1 on the first PET film, dry it, with a spraying thickness of 50 μm, and then put it into an 80 °C drying oven and bake for 1 h to form a conductive layer.

[0046] Step 4: Tear off the paper tapes on both sides of the first PET film, clean it up, cut the copper tape into a long copper tape and a short copper tape. The size of the long copper tape is 2.0 cm × 2.0 m. Stick the long copper tape in the middle of the blank at the edge of the first PET film, stick the short copper tapes on the conductive layer at intervals, with an interval distance of 0.2 m, and make the short copper tapes perpendicular to the long copper tape to obtain a composite material for standby.

[0047] Step 5: Stick the second PET film on the composite material, and evacuate the cavity between the first and second PET films.

[0048] Step 6: Stick the female heads of the waterproof male-female docking plugs on both sides of the PET film respectively, and encapsulate to obtain a continuous carbon nanotube heating film material.

[0049] Example 2

[0050] This example provides a continuous carbon nanotube heating material, including a first base film, a second base film, a conductive layer, and electrodes. Among them, the first and second base films are PET films; the raw materials of the conductive layer, by mass, include: 4.5 parts of continuous carbon nanotubes, 45 parts of graphite, 1.5 parts of sodium carboxymethyl cellulose, 150 parts of deionized water, 3 parts of polyvinyl alcohol, and 3 parts of activated carbon; the electrodes are copper tapes.

[0051] In this example, the preparation method of the continuous carbon nanotube heating material can refer to Example 1, the difference is that in Step 3, the spraying thickness is 75 μm.

[0052] Example 3

[0053] This example provides a continuous carbon nanotube heating material, including a first base film, a second base film, a conductive layer, and electrodes. Among them, the first and second base films are PET films; the raw materials of the conductive layer, by mass, include: 6 parts of continuous carbon nanotubes, 60 parts of graphite, 2 parts of sodium carboxymethyl cellulose, 200 parts of deionized water, 4 parts of polyvinyl alcohol, and 4 parts of activated carbon; the electrodes are copper tapes.

[0054] In this embodiment, the preparation method of the continuous carbon nanotube heating material may refer to Embodiment 2, with the difference that in Step 3, the spraying thickness is 100 μm.

[0055] Experimental Example

[0056] Thermal imaging tests were conducted on the continuous carbon nanotube heating material prepared in the embodiments of this application.

[0057] Test method: A transformer that converts 220V to 24V is used, and the power of the transformer is controlled at 300W or above. The transformer is connected to the female head of the waterproof male-female docking plug of the continuous carbon nanotube heating material obtained in the embodiments of this application, and then the power supply is started.

[0058] The test results are shown in Table 1.

[0059] Table 1 Thermal imaging test results of the continuous carbon nanotube heating material

[0060] Example Initial temperature (°C) Temperature after 5 minutes (°C) 1 25 42 2 25 44 3 25 45

[0061] As shown in Table 1, thermal imaging tests were conducted on the continuous carbon nanotube heating film material prepared in the embodiments of this application. After being powered on, the temperature of the continuous carbon nanotube heating material rapidly rises within 5 minutes, and the surface temperature distribution is uniform, meeting the performance requirements of heating materials in the energy storage field.

[0062] In summary, for the continuous carbon nanotube heating film material and its preparation method provided in this application, carbon nanotubes are used as the main conductive material. Due to their excellent electrical conductivity and thermal conductivity, rapid heating and temperature rise can be achieved within a short time, meeting the demand for rapid temperature response. By optimizing the composition ratio and structural design of the conductive layer, while ensuring the heating effect, energy consumption is reduced, meeting the application scenarios with strict power requirements such as energy-saving transformation. The base film uses a PET film, which has good flexibility and processability and can be customized according to the shape, size, and power requirements of different energy storage devices.

[0063] The continuous carbon nanotube heating film material of the present invention has high heating efficiency, rapid temperature rise, low power, stable performance, and long service life, and can be widely applied in the energy storage field, such as heat preservation, new energy power batteries, energy-saving transformation, etc.

[0064] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A continuous carbon nanotube heating film material, characterized in that, It includes a first base film, a conductive layer, an electrode and a second base film, wherein, the conductive layer is coated on the first base film; the electrode is located on the first base film and the conductive layer; the second base film is located on the conductive layer and the electrode; for the conductive layer, by mass, the raw materials include: 3-6 parts of continuous carbon nanotubes, 30-60 parts of graphite, 1-2 parts of dispersant, 100-200 parts of deionized water, 2-4 parts of adhesive and 2-4 parts of adsorbent.

2. The continuous carbon nanotube heating film material according to claim 1, wherein The dispersant is one or a combination of two of sodium carboxymethyl cellulose and polyvinylpyrrolidone.

3. The continuous carbon nanotube heating film material according to claim 1, wherein The adhesive is one or a combination of two of polyvinyl alcohol and hydroxyethyl cellulose.

4. The continuous carbon nanotube heating film material according to claim 1, wherein The adsorbent is an aqueous adsorbent, which is one or a combination of two of activated carbon and diatomite.

5. The continuous carbon nanotube heating film material according to claim 1, wherein The thickness of the conductive layer is 50-100 μm.

6. A method for preparing a continuous carbon nanotube heating film material according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Add carbon nanotubes, graphite, dispersant, binder, and adsorbent into deionized water according to the ratio, mix evenly, and filter to obtain a black slurry; Step 2: Cut the base film into the first base film and the second base film of the required specifications, and perform surface cleaning treatment on the first base film; Step 3: Use a spraying device to evenly spray the slurry obtained in Step 1 on the first base film, and dry it to form a conductive layer; Step 4: Paste the electrode on the first base film and the conductive layer to obtain a composite material; Step 5: Paste the second base film on the composite material, and evacuate the cavity between the first base film and the second base film; Step 6: Paste the terminal heads on both sides of the base film respectively, and encapsulate to obtain a continuous carbon nanotube heating film material.

7. The preparation method of the continuous carbon nanotube heating film material according to claim 7, characterized in that, In Step 3, the spraying thickness is 50-100 μm, and the drying conditions are: the drying temperature is 60-80 °C and the drying time is 0.5-2 hours.

8. The application of the continuous carbon nanotube heating film material according to any one of claims 1-7 in the energy storage field.

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