Electric heating floor rubber based on carbon nano tube and preparation method of electric heating floor rubber

Abstract

The invention relates to a carbon nanotube-based electric heating floor adhesive and a preparation method thereof, and in the structure of the electric heating floor adhesive, a heat insulation layer, an infrared ray reflection layer, a first polyimide layer, a carbon nanotube layer and a second polyimide layer are combined together, so that excellent electric heating conversion efficiency and heating speed are realized. Meanwhile, the invention further provides a preparation method of the electric heating floor adhesive based on the carbon nanotubes, the electric heating floor adhesive is prepared mainly through spraying, laminating, baking and curing processes, the production cost is low, and industrial popularization is facilitated.

Description

Technical Field

[0001] The invention relates to the field of heating technology, and in particular to an electric heating floor glue based on carbon nanotubes and a preparation method thereof. Background Art

[0002] In the current field of heating materials, the commonly used heating methods are mainly based on metal heating wires, graphene, carbon fiber and other materials. Although these electric heating materials can meet a certain degree of heating needs, they still have many limitations. For example, the energy consumption of the metal heating wire heating process is high, and it is easy to age due to frequent thermal expansion and contraction, recrystallization and grain coarsening, element migration and volatilization during long-term use, which makes its heating efficiency decay or even damage and leakage; the cost of single-layer graphene is high; multi-layer graphite sheets have the disadvantage of slip between graphite layers, which leads to problems such as unstable mechanical properties and difficult processing of electric heating components; carbon fiber electric heating elements are prone to skin-core structure, uneven resin impregnation, uneven bonding between carbon fiber and resin, etc. during the preparation process, which leads to uneven heating problems in carbon fiber electric heating components.

[0003] In recent years, with the development of nanotechnology, carbon nanotubes have gradually attracted attention due to their unique physical and chemical properties. Carbon nanotubes have excellent conductivity, high strength and good flexibility, and are considered to be an ideal flexible heating material. It is very urgent to develop a carbon nanotube-based electric heating element with fast heating speed, good weather resistance and high electric heat conversion rate. Summary of the invention

[0004] The purpose of the present invention is to develop an electric heating floor glue based on carbon nanotubes, so that it has the properties of good weather resistance, fast heating speed, high electric heat conversion efficiency and the like.

[0005] To achieve the above-mentioned objectives, the present application is implemented through the following technical scheme: an electric heating floor glue based on carbon nanotubes, comprising a stacked insulation layer, an infrared reflection layer, a first polyimide layer, a carbon nanotube layer, and a second polyimide layer, the thickness of the carbon nanotube layer is 5 to 10 μm, the thickness of the first polyimide layer is 0.8 to 1.2 mm, the thickness of the second polyimide layer is 0.8 to 1.2 mm, the thickness of the infrared reflection layer is 0.1 to 8 μm, and the thickness of the insulation layer is 2 to 10 μm.

[0006] As a further improvement of the present application, the carbon nanotube layer contains carbon nanotube macroscopic bodies, which are composed of carbon nanotube films or fiber woven meshes. The carbon nanotubes have a diameter of 0.4 to 20 nm, an aspect ratio of 2500 to 50000, and a purity of ≥99.99%.

[0007] As a further improvement of the present application, the carbon nanotube layer is prepared from carbon nanotube macroscopic bodies and silicone rubber.

[0008] As a further improvement of the present application, the carbon nanotube-based electric heating floor mat further includes a printing layer and a wear-resistant layer disposed on the second polyimide layer.

[0009] As a further improvement of the present application, the carbon nanotube layer is equipped with nickel-plated copper electrodes and is connected to a power source via wires.

[0010] To achieve the above object, the present application also provides a method for preparing the above-mentioned carbon nanotube-based electric heating floor glue, comprising the following steps: S1, placing the printed layer on the first unloading machine, the carbon nanotube layer on the second unloading machine, and the infrared reflection layer on the third unloading machine; S2, a first unloading machine unloads the material, the printed layer has a first surface and a second surface opposite to each other, and static electricity is applied to the printed layer; S3, applying polymer slurry A to the first surface of the printing layer by a spraying method, so that a polymer slurry A layer with a first preset thickness is formed on the first surface of the printing layer, and the polymer slurry A layer is baked and cured to form a wear-resistant layer; S4, applying polymer slurry B to the second surface of the printing layer by spraying to form a first polymer slurry B layer of a second preset thickness on the second surface of the printing layer, discharging material from a second discharging machine to attach the carbon nanotube layer to the first polymer slurry B layer, and then applying polymer slurry B to the surface of the carbon nanotube layer away from the first polymer slurry B layer by spraying to form a second polymer slurry B layer of a third preset thickness, discharging material from a third discharging machine to attach the infrared reflection layer to the second polymer slurry B layer, baking and curing to obtain a second polyimide layer, a carbon nanotube layer, a first polyimide layer and an infrared reflection layer stacked adjacent to the second surface of the printing layer; S5. Apply a heat-insulating material to the surface of the infrared reflective layer away from the first polyimide layer by a spraying method, bake, and foam to obtain an electric heating floor glue based on carbon nanotubes.

[0011] As a further improvement of the present application, the polymer slurry A is at least one of thermoplastic polyurethane elastomer, polyvinyl chloride, epoxy resin, and silicone rubber.

[0012] As a further improvement of the present application, the polymer slurry A contains 0.05% of single-walled carbon nanotubes, the diameter of the single-walled carbon nanotubes is 0.4-3 nm, the aspect ratio is ≥10000, and the purity is ≥98%.

[0013] As a further improvement of the present application, the thermal insulation material is silica aerogel, the average particle size of the silica is ≤100 mesh, and the thermal conductivity is ≤0.018 W / (m•K).

[0014] As a further improvement of the present application, in step S3, the curing is step curing, and the step curing is specifically: curing at 80° C. for 1 hour and curing at 110° C. for 2 hours.

[0015] The beneficial effects of the present application are as follows: The present application provides an electric heating flooring based on carbon nanotubes, which achieves excellent electric heat conversion efficiency and heating speed by combining a heat insulation layer, an infrared reflection layer, a first polyimide layer, a carbon nanotube layer, and a second polyimide layer. At the same time, the present application also provides a method for preparing an electric heating flooring based on carbon nanotubes, which mainly adopts spraying, laminating, baking, and curing processes to prepare the electric heating flooring, with low production cost and convenient for industrial promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the electric heating floor glue based on carbon nanotubes of the present application; Figure 2 is a scanning electron microscope image of the carbon nanotube layer of the present application; Figure 3 It is a schematic diagram of the preparation process of the electric heating floor glue based on carbon nanotubes of the present application; Figure 4 It is a comparative analysis diagram of the temperatures at different positions of the electric heating floor glue of Example 3 and Comparative Example 4 of the present application.

[0017] In the figure: 1. heat insulation layer; 2. infrared reflection layer; 3. first polyimide layer; 4. carbon nanotube layer; 5. second polyimide layer. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solution of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with specific implementation methods.

[0020] In order to develop a carbon nanotube-based electric heating floor glue with fast heating speed, the present application provides a carbon nanotube-based electric heating floor glue, such as Figure 1As shown, it includes a stacked heat insulation layer 1, an infrared reflection layer 2, a first polyimide layer 3, a carbon nanotube layer 4, and a second polyimide layer 5, the carbon nanotube layer 4 has a thickness of 5 to 10 μm, the first polyimide layer 3 has a thickness of 0.8 to 1.2 mm, the second polyimide layer 5 has a thickness of 0.8 to 1.2 mm, the infrared reflection layer has a thickness of 0.1 to 8 μm, and the heat insulation layer 1 has a thickness of 2 to 10 μm.

[0021] Based on the above technical scheme, the present application designs a multi-layer structure of an electric heating floor glue based on carbon nanotubes, including a thermal insulation layer 1, an infrared reflection layer 2, a polyimide layer and a carbon nanotube layer 4, wherein: the carbon nanotube layer 4 is the main heating structure; the polyimide layers arranged on both sides of the carbon nanotube layer 4 have good insulation and mechanical strength, and are used to support the carbon nanotubes and prevent leakage; the main function of the infrared reflection layer is to reflect infrared rays. When the carbon nanotube layer 4 generates heat, it will emit infrared radiation. The infrared reflection layer can reflect these infrared rays back to the interior of the electric heating floor glue, reducing heat loss, thereby further improving the heating efficiency; the main function of the thermal insulation layer 1 is to reduce the loss of heat from the electric heating floor glue to the surrounding environment. By using thermal insulation materials (such as silica aerogel), the thermal insulation layer 1 can effectively block the conduction of heat and ensure that most of the heat is retained inside the electric heating floor glue, thereby improving the heating efficiency.

[0022] The thickness of the carbon nanotube layer 4, polyimide layer, infrared reflection layer and heat insulation layer 1 designed in this application is mainly to ensure that the electric heating floor has overall flexibility. Of course, the layers of the electric heating floor based on the carbon nanotube layer designed in this application can also be set to other thicknesses to meet the application requirements of different scenarios. At the same time, the carbon nanotube layer 4 can also ensure sufficient electrical conductivity and heating efficiency, the polyimide layer has good insulation performance and mechanical strength, the infrared reflection layer can well reflect infrared rays, and the heat insulation layer 1 can effectively block the conduction of heat.

[0023] In an optional embodiment, the carbon nanotube layer 4 contains a carbon nanotube macrobody, which is composed of a carbon nanotube film or a fiber woven mesh, and the carbon nanotube has a diameter of 0.4 to 20 nm, an aspect ratio of 2500 to 50000, and a purity of ≥99.99%. The scanning electron microscope image of the carbon nanotube layer 4 is shown in FIG. Figure 2 As shown. This structural form gives the electric heating floor glue better flexibility and bendability, so that it can adapt to complex decorative layers, broadening the application range of the electric heating floor glue, such as being applicable to decorative layers of different materials such as wooden floors, plush carpets, and marble. The design of the diameter and aspect ratio of the carbon nanotubes in this application can satisfy the requirement that the formed carbon nanotube layer 4 has excellent conductivity and mechanical properties, can generate sufficient heat at a lower current, and at the same time ensure the strength and flexibility of the electric heating floor glue.

[0024] In an optional embodiment, the carbon nanotube layer 4 is made of carbon nanotube macro-bodies and polymer materials such as silicone rubber. The use of different polymer materials and carbon nanotube macro-bodies to further improve the flexibility and durability of the electric heating floor glue, so that it can better adapt to different use environments and mechanical stresses.

[0025] In an optional embodiment, the carbon nanotube-based electric heating floor glue also includes a decorative layer provided on the second polyimide layer 5. Preferably, the decorative layer can be a combination of a printed layer and a wear-resistant layer, a wooden floor layer, a plush carpet layer, a marble layer, etc. Among them, the printed layer increases the aesthetics and identification of the electric heating floor glue, and can be used to mark information such as brand, model, instructions for use, etc., to facilitate user identification and use. The wear-resistant layer improves the surface wear resistance of the electric heating floor glue and extends its service life, so that it can better adapt to frequent friction and wear, especially in application scenarios such as hard floors that require higher wear resistance. Preferably, the thickness of the wear-resistant layer is 0.1 to 0.25 mm.

[0026] In an optional embodiment, the carbon nanotube layer 4 is equipped with a nickel-plated copper electrode and is connected to a power source through an electric wire. The power source is used to heat the carbon nanotube layer 4. Preferably, the nickel-plated copper electrode can also be connected to a signal acquisition module through a micro-conductive connection point. The carbon nanotube layer 4 of the present application can change temperature as the resistance changes. The signal acquisition module is used to collect the resistance change signal of the carbon nanotube layer 4 and transmit it to the signal processing module, the data transmission module and the data processing center. By connecting the signal acquisition module, the resistance change signal of the carbon nanotube layer 4 can be collected in real time, so as to monitor the working state of the electric heating floor glue, such as temperature change, current anomaly, etc. The collected signal is transmitted to the signal processing module, the data transmission module and the data processing center, so as to realize the intelligent control and remote monitoring of the electric heating floor glue, improve the safety and convenience of use, and facilitate the timely discovery and handling of faults.

[0027] To achieve the above object, the present application also provides a method for preparing the above-mentioned carbon nanotube-based electric heating floor glue, such as Figure 3 As shown, the following steps are included: S1, placing the printed layer on the first unloading machine, the carbon nanotube layer 4 on the second unloading machine, and the infrared reflection layer on the third unloading machine; S2, a first unloading machine unloads the material, the printed layer has a first surface and a second surface opposite to each other, and static electricity is applied to the printed layer; S3, applying polymer slurry A to the first surface of the printing layer by a spraying method, so that a polymer slurry A layer with a first preset thickness is formed on the first surface of the printing layer, and the polymer slurry A layer is baked and cured to form a wear-resistant layer; S4, applying polymer slurry B to the second surface of the printing layer by spraying, so that a first polymer slurry B layer of a second preset thickness is formed on the second surface of the printing layer, the second feeder discharges materials, so that the carbon nanotube layer 4 is attached to the first polymer slurry B layer, and then applying the polymer slurry B to the surface of the carbon nanotube layer 4 away from the first polymer slurry B layer by spraying, so as to form a second polymer slurry B layer of a third preset thickness, the third feeder discharges materials, so that the infrared reflection layer is attached to the second polymer slurry B layer, and baking and curing are performed to obtain a second polyimide layer 5, a carbon nanotube layer 4, a first polyimide layer 3 and an infrared reflection layer 2 stacked adjacent to the second surface of the printing layer; S5. Apply a heat-insulating material to the surface of the infrared reflective layer 2 away from the first polyimide layer 3 by a spraying method, bake, and foam to obtain an electric heating floor glue based on carbon nanotubes.

[0028] Based on the above technical solution, precise lamination of multiple layers of materials is achieved through processes such as material discharge, spraying, and attachment, ensuring the structural integrity and performance consistency of the electric heating flooring. Applying static electricity to the printing layer helps to improve the adhesion of the polymer slurry, so that the wear-resistant layer and the polyimide layer can be better attached to the printing layer, enhancing the overall structural stability of the electric heating flooring. Applying polymer slurry by spraying can evenly form a polymer slurry layer of a preset thickness on the surface of the printing layer, ensuring the uniformity of the thickness of the wear-resistant layer and the polyimide layer, and improving the quality and performance of the electric heating flooring.

[0029] In an optional embodiment, the polymer slurry A is at least one of thermoplastic polyurethane elastomer, polyvinyl chloride, epoxy resin, and silicone rubber. The composite use of thermoplastic polyurethane elastomer, polyvinyl chloride, epoxy resin, silicone rubber and other materials gives the polymer slurry A good wear resistance, flexibility and adhesion, which can meet the needs of different application scenarios.

[0030] In an optional embodiment, the polymer slurry A contains 0.05% of single-walled carbon nanotubes, the diameter of the single-walled carbon nanotubes is 0.4-3nm, the aspect ratio is ≥10000, and the purity is ≥98%. Adding 0.05% of single-walled carbon nanotubes to the polymer slurry A further improves the conductivity, heat dissipation and mechanical strength of the slurry, thereby enhancing the wear resistance and heat dissipation of the wear-resistant layer.

[0031] In an optional embodiment, the thermal insulation material is silica aerogel, the average particle size of the silica is ≤100 mesh, and the thermal conductivity is ≤0.018 W / (m•K). Silica aerogel: It has excellent thermal insulation performance and lightweight characteristics, can effectively reduce the loss of heat to the external environment, improve the thermal insulation of the electric heating floor glue, and maintain the overall lightness of the electric heating floor glue. Controlling the silica within a preset particle size range, on the one hand, ensures the uniform distribution of the thermal insulation material and good thermal insulation effect, avoids uneven thermal insulation performance or excessive local thermal resistance due to excessively large particles, and on the other hand, facilitates the preparation of a thin, flexible thermal insulation layer 1.

[0032] In an optional embodiment, in step S3, the curing is step curing, and the step curing is specifically: curing at 80°C for 1 hour and curing at 110°C for 2 hours. The step curing method (curing at 80°C for 1 hour and curing at 110°C for 2 hours) can effectively avoid incomplete curing of the polymer slurry or degradation of performance due to excessively high or low temperatures, thereby improving the curing effect and the mechanical properties of the electric thermal floor glue.

[0033] In order to verify that the technical solution of the present application has excellent effects, some examples of preparing electric heating floor glue are provided below, as follows: Example 1 First, the printing layer is placed on the first unloading machine, the carbon nanotube layer is placed on the second unloading machine, and the infrared reflective layer is placed on the third unloading machine. Secondly, the first unloading machine unloads the material, and the printing layer has a first surface and a second surface relative to each other, and static electricity is applied to the printing layer; polymer slurry A is applied to the first surface of the printing layer by spraying, so that the first surface of the printing layer forms a polymer slurry A layer with a first preset thickness, and the polymer slurry A layer is baked and cured to form a wear-resistant layer, and the thickness of the wear-resistant layer is 0.1mm, wherein polymer slurry A is a thermoplastic polyurethane elastomer containing 0.05% single-walled carbon nanotubes. The curing is step curing, and the step curing is specifically: curing at 80°C for 1h and curing at 110°C for 2h.

[0034] Again, a polymer slurry B is applied to the second surface of the printing layer by a spraying method to form a first polymer slurry B layer of a second preset thickness on the second surface of the printing layer, a second feeder discharges material to attach the carbon nanotube layer to the first polymer slurry B layer, and then a polymer slurry B is applied to the surface of the carbon nanotube layer away from the first polymer slurry B layer by a spraying method to form a second polymer slurry B layer of a third preset thickness, a third feeder discharges material to attach the infrared reflection layer to the second polymer slurry B layer, and the mixture is baked and cured to obtain a second polyimide layer, a carbon nanotube layer, a first polyimide layer and an infrared reflection layer stacked adjacent to the second surface of the printing layer; wherein the polymer slurry B is a polyimide slurry, the thickness of the first polyimide layer and the second polyimide layer are 0.8 mm respectively, the thickness of the carbon nanotube layer is 5 μm, the infrared reflection layer is an aluminum film, and the thickness of the infrared reflection layer is 0.1 μm.

[0035] S5. Apply a heat-insulating material to the surface of the infrared reflecting layer away from the first polyimide layer by a spraying method, bake, and foam to obtain a heat-insulating layer, thereby obtaining a complete carbon nanotube-based electric heating floor glue, wherein the heat-insulating material is silica aerogel and the thickness of the heat-insulating layer is 2 μm.

[0036] Example 2 First, the printing layer is placed on the first unloading machine, the carbon nanotube layer is placed on the second unloading machine, and the infrared reflective layer is placed on the third unloading machine. Secondly, the first unloading machine unloads the material, and the printing layer has a first surface and a second surface relative to each other, and static electricity is applied to the printing layer; polymer slurry A is applied to the first surface of the printing layer by spraying, so that the first surface of the printing layer forms a polymer slurry A layer with a first preset thickness, and the polymer slurry A layer is baked and cured to form a wear-resistant layer, and the thickness of the wear-resistant layer is 0.25 mm, wherein polymer slurry A is a thermoplastic polyurethane elastomer containing 0.05% single-walled carbon nanotubes. The curing is step curing, and the step curing is specifically: curing at 80°C for 1h and curing at 110°C for 2h.

[0037] Again, a polymer slurry B is applied to the second surface of the printing layer by a spraying method to form a first polymer slurry B layer of a second preset thickness on the second surface of the printing layer, a second feeder discharges material to attach the carbon nanotube layer to the first polymer slurry B layer, and then a polymer slurry B is applied to the surface of the carbon nanotube layer away from the first polymer slurry B layer by a spraying method to form a second polymer slurry B layer of a third preset thickness, a third feeder discharges material to attach the infrared reflection layer to the second polymer slurry B layer, and the mixture is baked and cured to obtain a second polyimide layer, a carbon nanotube layer, a first polyimide layer and an infrared reflection layer stacked adjacent to the second surface of the printing layer; wherein the polymer slurry B is a polyimide slurry, the thickness of the first polyimide layer and the second polyimide layer are 1.2 mm respectively, the thickness of the carbon nanotube layer is 10 μm, the infrared reflection layer is an aluminum film, and the thickness of the infrared reflection layer is 8 μm.

[0038] S5. Apply a heat-insulating material to the surface of the infrared reflective layer away from the first polyimide layer by a spraying method, bake, and foam to obtain a heat-insulating layer, thereby obtaining a complete carbon nanotube-based electric heating floor glue, wherein the heat-insulating material is silica aerogel and the thickness of the heat-insulating layer is 10 μm.

[0039] Example 3 First, the printing layer is placed on the first unloading machine, the carbon nanotube layer is placed on the second unloading machine, and the infrared reflective layer is placed on the third unloading machine. Secondly, the first unloading machine unloads the material, and the printing layer has a first surface and a second surface relative to each other, and static electricity is applied to the printing layer; polymer slurry A is applied to the first surface of the printing layer by spraying, so that the first surface of the printing layer forms a polymer slurry A layer with a first preset thickness, and the polymer slurry A layer is baked and cured to form a wear-resistant layer, and the thickness of the wear-resistant layer is 0.15mm, wherein polymer slurry A is a thermoplastic polyurethane elastomer containing 0.05% single-walled carbon nanotubes. The curing is step curing, and the step curing is specifically: curing at 80°C for 1h and curing at 110°C for 2h.

[0040] Again, a polymer slurry B is applied to the second surface of the printing layer by a spraying method to form a first polymer slurry B layer of a second preset thickness on the second surface of the printing layer, a second feeder discharges material to attach the carbon nanotube layer to the first polymer slurry B layer, and then a polymer slurry B is applied to the surface of the carbon nanotube layer away from the first polymer slurry B layer by a spraying method to form a second polymer slurry B layer of a third preset thickness, a third feeder discharges material to attach the infrared reflection layer to the second polymer slurry B layer, and the mixture is baked and cured to obtain a second polyimide layer, a carbon nanotube layer, a first polyimide layer and an infrared reflection layer stacked adjacent to the second surface of the printing layer; wherein the polymer slurry B is a polyimide slurry, the thickness of the first polyimide layer and the second polyimide layer are 1.0 mm respectively, the thickness of the carbon nanotube layer is 8 μm, the infrared reflection layer is an aluminum film, and the thickness of the infrared reflection layer is 5 μm.

[0041] S5. Apply a heat-insulating material to the surface of the infrared reflecting layer away from the first polyimide layer by a spraying method, bake, and foam to obtain a heat-insulating layer, thereby obtaining a complete carbon nanotube-based electric heating floor glue, wherein the heat-insulating material is silica aerogel and the thickness of the heat-insulating layer is 6 μm.

[0042] Example 4 The difference between this embodiment and embodiment 3 is that the polymer slurry A is polyvinyl chloride (PVC).

[0043] Example 5 The difference between this embodiment and embodiment 3 is that the polymer slurry A is epoxy resin (EP).

[0044] Example 6 The difference between this embodiment and embodiment 3 is that the polymer slurry A is silicone rubber (PMQ&VMQ).

[0045] Comparative Example 1 The difference between this embodiment and embodiment 3 is that the polymer slurry A is a thermoplastic polyurethane elastomer that does not contain 0.05% of single-walled carbon nanotubes.

[0046] Comparative Example 2 The difference between this embodiment and embodiment 3 is that step curing is not used for curing the polymer slurry A layer.

[0047] Comparative Example 3 The difference between this comparative example and Example 3 is that a multi-layer graphite sheet is used to replace the carbon nanotubes in the carbon nanotube layer.

[0048] Comparative Example 4 The difference between this comparative example and Example 3 is that carbon fibers are used to replace the carbon nanotubes in the carbon nanotube layer.

[0049] Comparative Example 5 Commercially available metal heating wire elements are used.

[0050] The performance tests were conducted on the carbon nanotube-based electric heating elements of the above-mentioned Examples 1-6 and Comparative Examples 1-5. The test data are shown in Table 1 below.

[0051] The friction coefficient of the above products is tested according to the standard "GB / T 10006-2021 Determination of friction coefficient of plastic films and sheets".

[0052] A temperature rise test was conducted on 5 square meters of the electric heating elements prepared in the above embodiments and comparative examples, and an infrared thermal imager was used to test the thermal uniformity of the electric heating floor glue within the range of 5 square meters.

[0053] Table 1

[0054] From the analysis of Table 1, it can be seen that the friction coefficient of the product increases slightly as the thickness of the wear-resistant layer increases. Adding single-walled carbon nanotubes or adopting a step-curing method during the preparation of the wear-resistant layer can increase the friction coefficient of the wear-resistant layer and improve the anti-slip ability. Although the surface wear resistance of Comparative Example 3 is similar to that of Example 3, it has been verified in practice that the electric heating floor glue prepared from multi-layer graphite sheets is prone to interlayer slip after long-term use, resulting in a shorter service life of the electric heating floor glue.

[0055] By comparing the time required to heat up to 37°C in Examples 1 to 6 and Comparative Example 5, it can be seen that the time required for the carbon nanotube-based electric heating floor glue of the present application to heat up to 37°C is less than 1 minute, indicating that the carbon nanotube-based electric heating floor glue layer selected in the present application has an excellent electric heat conversion rate, and the combination of the heat insulation layer, infrared reflection layer, first polyimide layer, second polyimide layer and carbon nanotube layer has excellent thermal insulation performance.

[0056] Through thermal uniformity analysis, it can be seen that the carbon nanotube-based electric heating floor glue of the present application has excellent thermal uniformity.

[0057] In addition, the present application also uses thermocouples to randomly measure the temperature of 5 positions of the electric heating elements of Example 3 and Comparative Example 4 after heating. The temperature comparison diagram of the electric heating elements of Example 3 and Comparative Example 4 at different positions is as follows: Figure 4 As shown, by Figure 4 It can be seen from the analysis that compared with the commercially available resistance wire heating element of Comparative Example 4, the carbon nanotube-based electric heating floor glue of Example 3 has excellent heating temperature uniformity.

[0058] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0059] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. An electric heating flooring based on carbon nanotubes, characterized in that: It includes a stacked heat insulation layer, an infrared reflection layer, a first polyimide layer, a carbon nanotube layer, and a second polyimide layer, wherein the carbon nanotube layer has a thickness of 5 to 10 μm, the first polyimide layer has a thickness of 0.8 to 1.2 mm, the second polyimide layer has a thickness of 0.8 to 1.2 mm, the infrared reflection layer has a thickness of 0.1 to 8 μm, and the heat insulation layer has a thickness of 2 to 10 μm.

2. The electric heating flooring based on carbon nanotubes according to claim 1, characterized in that: The carbon nanotube layer contains carbon nanotube macroscopic bodies, which are composed of carbon nanotube films or fiber woven nets. The carbon nanotubes have a diameter of 0.4-20 nm, an aspect ratio of 2500-50000, and a purity of ≥99.99%.

3. The electric heating flooring based on carbon nanotubes according to claim 2, characterized in that: The carbon nanotube layer is prepared from carbon nanotube macroscopic bodies and silicone rubber.

4. The carbon nanotube-based electric heating floor glue according to any one of claims 1 to 3, characterized in that: The carbon nanotube-based electric heating floor glue further includes a printing layer and a wear-resistant layer arranged on the second polyimide layer.

5. The electric heating flooring based on carbon nanotubes according to claim 4, characterized in that: The carbon nanotube layer is equipped with nickel-plated copper electrodes and is connected to a power source via wires.

6. A method for preparing the electric heating flooring based on carbon nanotubes according to claim 4, characterized in that: The steps include: S1, placing the printed layer on the first unloading machine, the carbon nanotube layer on the second unloading machine, and the infrared reflection layer on the third unloading machine; S2, a first unloading machine unloads the material, the printed layer has a first surface and a second surface opposite to each other, and static electricity is applied to the printed layer; S3, applying polymer slurry A to the first surface of the printing layer by a spraying method, so that a polymer slurry A layer with a first preset thickness is formed on the first surface of the printing layer, and the polymer slurry A layer is baked and cured to form a wear-resistant layer; S4, applying polymer slurry B to the second surface of the printing layer by spraying to form a first polymer slurry B layer of a second preset thickness on the second surface of the printing layer, discharging material from a second discharging machine to attach the carbon nanotube layer to the first polymer slurry B layer, and then applying polymer slurry B to the surface of the carbon nanotube layer away from the first polymer slurry B layer by spraying to form a second polymer slurry B layer of a third preset thickness, discharging material from a third discharging machine to attach the infrared reflection layer to the second polymer slurry B layer, baking and curing to obtain a second polyimide layer, a carbon nanotube layer, a first polyimide layer and an infrared reflection layer stacked adjacent to the second surface of the printing layer; S5. Apply a heat-insulating material to the surface of the infrared reflective layer away from the first polyimide layer by a spraying method, bake, and foam to obtain an electric heating floor glue based on carbon nanotubes.

7. The method for preparing electric heating flooring based on carbon nanotubes according to claim 6, characterized in that: The polymer slurry A is at least one of thermoplastic polyurethane elastomer, polyvinyl chloride, epoxy resin and silicone rubber.

8. The method for preparing electric heating flooring based on carbon nanotubes according to claim 7, characterized in that: The polymer slurry A contains 0.05% of single-walled carbon nanotubes, the diameter of the single-walled carbon nanotubes is 0.4-3 nm, the aspect ratio is ≥10000, and the purity is ≥98%.

9. The method for preparing electric heating flooring based on carbon nanotubes according to claim 6, characterized in that: The thermal insulation material is silicon dioxide aerogel, the average particle size of the silicon dioxide is ≤100 mesh, and the thermal conductivity is ≤0.018 W / (m•K).

10. The method for preparing electric heating flooring based on carbon nanotubes according to claim 6, characterized in that: In step S3, the curing is step curing, and the step curing is specifically: curing at 80° C. for 1 hour and curing at 110° C. for 2 hours.

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