A method for producing graphene electric heating film

Abstract

The invention relates to the technical field of electric heating, in particular to a production method of a graphene electric heating film, comprising the following steps: preparing raw materials for producing the electric heating film, such as conductive carbon paste, heating carbon paste, conductive silver paste, hot melt adhesive film and sealing bag, using printing equipment to print the conductive carbon paste, heating carbon paste and conductive silver paste on the electric heating film, and packaging the film after compounding the hot melt adhesive film, metal current-carrying strip and electric heating film twice. The invention adopts double insulation and double waterproof design, and is provided with a leakage current recovery device and an anti-electromagnetic radiation device, so that the graphene electric heating film reaches the national standard second-class electrical appliance level in terms of electric shock protection level, the electromagnetic protection reaches the national standard first-class standard, the waterproof level reaches IPX7 level or above, and the humid insulation resistance can reach 100MΩ or above. At the same time, the graphene electric heating film has a high degree of modularization, does not need to do the work of electric heating film wiring, etc., not only simplifies the installation link, but also greatly improves the construction efficiency and improves the safety requirements for use.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating, in particular to a method for producing a graphene electric heating film. Background Art

[0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It has excellent properties such as high charge carrying capacity, low resistivity, high electrical conductivity, and high thermal conductivity. Graphene has extremely strong electrical conductivity, and the concentration of holes and electron carriers can reach 1013cm-2. Electrons migrate directly in the graphene layer without scattering, and the carrier mobility can reach 15000cm2 / (vs). The graphene structure is also very stable, and the flexible outer surface can bend and deform to adapt to external forces, thereby maintaining the stability of the lattice structure, making its thermal conductivity better than any known material, and its thermal conductivity is as high as 5300W / m·K. Because graphene has light weight, large specific surface area, extraordinary electrochemical properties and excellent thermal conductivity, graphene is used to compound related compounds to obtain modified new materials, and then this new material is used to participate in the preparation of electric heating film liquid. The electric heating film produced has excellent performance and greatly improves the stability of electrical conductivity and thermal stability of work.

[0003] As the use of graphene electric heating films becomes more and more frequent, there are various problems in the preparation of graphene electric heating films in the prior art, such as poor electromagnetic protection effect and low modularization. Therefore, in view of the above situation, it is urgent to develop a production method of graphene electric heating films to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The purpose of the present invention is to provide a method for producing a graphene electric heating film to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for producing a graphene electric heating film comprises the following steps:

[0007] Step 1: Prepare conductive carbon paste, heating carbon paste, conductive silver paste, hot melt adhesive film, sealing bag and other raw materials for producing electric heating film;

[0008] Step 2: Use a printing device to print the conductive carbon paste according to a preset pattern to produce a film with a shielding circuit;

[0009] Step 3: Use a printing device to print the heating carbon paste on the reverse side of the film with the shielding circuit according to a pre-designed conductive circuit diagram, and adjust the resistance of the heating carbon paste to meet the power design requirements as required;

[0010] Step 4: Use a printing device to print the conductive silver paste on the heating carbon paste according to a pre-designed pattern;

[0011] Step 5: Use a laminating machine to heat-press the metal current-carrying bar, the film printed with the silver paste circuit and the heating carbon paste circuit, and the hot-melt adhesive film, wherein the metal current-carrying bar is located between the heating carbon paste film and the pre-coated adhesive film, and the current-carrying part of the metal current-carrying bar is in contact with the silver paste but not with the heating carbon paste;

[0012] Step 6: Compounding the hot melt adhesive film, the metal current carrying strip and the electric heating film prepared in step 5 by using a hot pressing compounding machine, wherein the metal current carrying strip is located between the hot melt adhesive film and the printed electromagnetic shielding layer, to produce an electric heating film with a leakage current absorption layer;

[0013] Step 7: Connect the electric heating film prepared in step 6 to the power line using a cold pressing terminal or welding process as required, wherein the metal current-carrying bar of the printed electromagnetic shielding layer is connected to the neutral line of the power supply, and the current-carrying bar of the heating carbon paste is connected to the neutral line and the live line of the power supply respectively;

[0014] Step 8: Put the electric heating film with power supply and insulation device into the pre-made bag with sealed both sides, and make a special outlet crimping mold at the power outlet to ensure that the power outlet can be closed with the sealed bag without damaging the power connection line. Use a high-frequency sealing machine to seal both ends of the bag, and use a vacuum pump to evacuate the air in the bag.

[0015] As a further solution of the present invention: the preparation steps of the conductive carbon paste and the heat-generating carbon paste are to add one or more of carbon black, graphite, carbon nanotubes, and graphene to an adhesive, a diluent, a dispersant, a leveling agent, a plasticizer, and a defoaming agent to make a conductive ink with conductive and resistive properties.

[0016] As a further solution of the present invention: the preparation step of the conductive silver paste is to add one or more of silver powder, copper powder, silver-plated copper powder, aluminum powder, and nickel powder to an adhesive, a diluent, a dispersant, a leveling agent, a defoaming agent, and a plasticizer to make a conductive paste with conductive properties.

[0017] As a further solution of the present invention: in the preparation process of the conductive carbon paste and the conductive silver paste, a stirrer, a three-roll disperser and a sand mill are used for stirring, dispersing and other operations.

[0018] As a further solution of the present invention: the hot melt adhesive film is made by using a laminating machine or a coating machine to uniformly spray one or more of EVA, PE, TPU, and PES on a polyester film or other film with insulating properties by laminating or coating, thereby making a pre-coated adhesive film that can be laminated by heating and pressurizing.

[0019] As a further solution of the present invention: the sealing bag is made of PVC material with good flame retardant performance.

[0020] As a further solution of the present invention: the metal current-carrying bar is a degreased copper bar.

[0021] As a further solution of the present invention: the printing equipment is a gravure printing machine, a screen printing machine, a coating machine and an offset printing machine.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By adopting double insulation and double waterproof design, and equipped with leakage current recovery device and anti-electromagnetic radiation device, the graphene electric heating film can reach the national standard Class II electrical appliance level in terms of electric shock protection, and the electromagnetic protection reaches the national standard Class I standard. The electric floor heating laid with this kind of electric heating film will not affect human health in the case of long-term use. Its waterproof level reaches IPX7 or above, and the damp insulation resistance can reach more than 100MΩ;

[0024] 2. The graphene electric heating film has a high degree of modularity and does not require work such as electric heating film wiring. It not only simplifies the installation process, but also greatly improves the construction efficiency and safety requirements for use. DETAILED DESCRIPTION

[0025] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0026] Example 1

[0027] A method for producing a graphene electric heating film comprises the following steps:

[0028] Step 1: Prepare conductive carbon paste, heating carbon paste, conductive silver paste, hot melt adhesive film, sealing bag and other raw materials for producing electric heating film;

[0029] Step 2: Use a printing device to print the conductive carbon paste according to a preset pattern to produce a film with a shielding circuit;

[0030] Step 3: Use a printing device to print the heating carbon paste on the reverse side of the film with the shielding circuit according to a pre-designed conductive circuit diagram, and adjust the resistance of the heating carbon paste to meet the power design requirements as required;

[0031] Step 4: Use a printing device to print the conductive silver paste on the heating carbon paste according to a pre-designed pattern, so that the conductive silver paste can play a role in supplying power to the heating carbon paste;

[0032] Step 5: Use a laminating machine to heat-press the metal current-carrying bar, the film printed with the silver paste circuit and the heating carbon paste circuit, and the hot-melt adhesive film, wherein the metal current-carrying bar is located between the heating carbon paste film and the pre-coated adhesive film, and the current-carrying part of the metal current-carrying bar is in contact with the silver paste but not with the heating carbon paste;

[0033] Step 6: Compounding the hot melt adhesive film, the metal current carrying strip and the electric heating film prepared in step 5 by using a hot pressing compounding machine, wherein the metal current carrying strip is located between the hot melt adhesive film and the printed electromagnetic shielding layer, to produce an electric heating film with a leakage current absorption layer;

[0034] Step 7: Connect the electric heating film prepared in step 6 to the power line using a cold pressing terminal or welding process as required, wherein the metal current-carrying bar of the printed electromagnetic shielding layer is connected to the neutral line of the power supply, and the current-carrying bar of the heating carbon paste is connected to the neutral line and the live line of the power supply respectively;

[0035] Step 8: Put the electric heating film with power supply and insulation device into the pre-made bag with sealed both sides, and make a special outlet crimping mold at the power outlet to ensure that the power outlet can be closed with the sealed bag without damaging the power connection line. Use a high-frequency sealing machine to seal both ends of the bag, and use a vacuum pump to evacuate the air in the bag.

[0036] Example 2

[0037] In this embodiment, the preparation steps of the conductive carbon paste and the heat-generating carbon paste are to add one or more of carbon black, graphite, carbon nanotubes, and graphene to an adhesive, a diluent, a dispersant, a leveling agent, a plasticizer, and a defoaming agent to make a conductive ink with conductive and resistive properties that can be screen, gravure, or offset printed.

[0038] In this embodiment, the conductive carbon paste has different resistance characteristics according to different usage requirements and different production powers. The conductive carbon paste can not only absorb the leakage current generated when the electric heating film is working, thereby solving the leakage problem caused by distributed capacitance, but also can have a certain shielding effect on the electromagnetic field generated by the working of the electric heating film.

[0039] In this embodiment, the preparation step of the conductive silver paste is to add one or more of silver powder, copper powder, silver-plated copper powder, aluminum powder, and nickel powder to an adhesive, a diluent, a dispersant, a leveling agent, a defoaming agent, and a plasticizer to make a conductive paste with conductive properties.

[0040] In this embodiment, a stirrer, a three-roll disperser and a sand mill are used to perform stirring, dispersing and other operations during the preparation of the conductive carbon paste and the conductive silver paste.

[0041] In this embodiment, the hot melt adhesive film is made by using a laminating machine or a coating machine to evenly spray one or more of EVA, PE, TPU, and PES on a polyester film or other film with insulating properties by laminating or coating, thereby making a pre-coated adhesive film that can be laminated by heating and pressurizing.

[0042] In this embodiment, the sealing bag is made of PVC material with good flame retardant properties, and the specific production steps are as follows:

[0043] Use a high-frequency bag-making and sealing machine or a hot-melt sealing machine to make two pieces of PVC material into a cylindrical material with sealing properties on both sides according to the width of the electric heating film.

[0044] In this embodiment, the metal current-carrying bar is a degreased copper bar.

[0045] In this embodiment, the printing equipment is a gravure printing machine, a screen printing machine, a coating machine and an offset printing machine.

[0046] The production method of the graphene electric heating film adopts double insulation and double waterproof design, and is equipped with a leakage current recovery device and an anti-electromagnetic radiation device, so that the graphene electric heating film reaches the national standard Class II electrical appliance level in terms of electric shock protection, and the electromagnetic protection reaches the national standard Class I standard. The electric floor heating laid using this electric heating film will not affect human health in the case of long-term use. Its waterproof level reaches IPX7 or above, and its humid insulation resistance can reach more than 100MΩ. At the same time, the graphene electric heating film has a high degree of modularization, and does not need to do work such as electric heating film wiring, which not only simplifies the installation process, but also greatly improves the construction efficiency and improves the safety requirements for use.

[0047] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for producing a graphene electric heating film, characterized in that: The following steps are involved: Step 1: Prepare conductive carbon paste, heating carbon paste, conductive silver paste, hot melt adhesive film and sealing bag to produce raw materials for electric heating film; Step 2: Use a printing device to print the conductive carbon paste according to a preset pattern to produce a film with a shielding circuit; Step 3: Use a printing device to print the heating carbon paste on the reverse side of the film with the shielding circuit according to a pre-designed conductive circuit diagram, and adjust the resistance of the heating carbon paste to meet the power design requirements as required; Step 4: Use a printing device to print the conductive silver paste on the heating carbon paste according to a pre-designed pattern; Step 5: Use a laminating machine to heat-press the metal current-carrying bar, the film printed with the silver paste circuit and the heating carbon paste circuit, and the hot-melt adhesive film, wherein the metal current-carrying bar is located between the heating carbon paste film and the pre-coated adhesive film, and the current-carrying part of the metal current-carrying bar is in contact with the silver paste but not with the heating carbon paste; Step 6: Compounding the hot melt adhesive film, the metal current carrying strip and the electric heating film prepared in step 5 by using a hot pressing compounding machine, wherein the metal current carrying strip is located between the hot melt adhesive film and the printed electromagnetic shielding layer, to produce an electric heating film with a leakage current absorption layer; Step 7: Connect the electric heating film prepared in step 6 to the power line using a cold pressing terminal or welding process as required, wherein the metal current-carrying bar of the printed electromagnetic shielding layer is connected to the neutral line of the power supply, and the current-carrying bar of the heating carbon paste is connected to the neutral line and the live line of the power supply respectively; Step 8: Put the electric heating film with power supply connected and insulation device into the pre-made bag with sealed two sides, and make a special outlet crimping die at the power outlet to ensure that the power outlet can be closed with the sealed bag without damaging the power connection line, use a high-frequency sealing machine to seal the two ends of the bag, and use a vacuum pump to evacuate the air in the bag; The preparation steps of the conductive carbon paste and the heating carbon paste are both to add one or more of carbon black, graphite, carbon nanotubes, and graphene to a binder, a diluent, a dispersant, a leveling agent, a plasticizer, and a defoaming agent to make a conductive ink with conductive and resistive properties; The preparation step of the conductive silver paste is to add one or more of silver powder, copper powder, silver-plated copper powder, aluminum powder, and nickel powder into an adhesive, a diluent, a dispersant, a leveling agent, a defoamer, and a plasticizer to make a conductive paste with conductive properties; In the preparation process of the conductive carbon paste and the conductive silver paste, a stirrer, a three-roll disperser and a sand mill are used for stirring and dispersing operations; The hot melt adhesive film is made by using a laminating machine or a coating machine to uniformly spray one or more of EVA, PE, TPU, and PES on a polyester film or other film with insulating properties by laminating or coating, so as to be a pre-coated adhesive film that can be laminated by heating and pressurizing.

2. The method for producing a graphene electric heating film according to claim 1, characterized in that: The sealing bag is made of PVC material with good flame retardant performance.

3. The method for producing a graphene electric heating film according to claim 1, characterized in that: The metal current-carrying bar is a degreased copper bar.

4. The method for producing a graphene electric heating film according to claim 1, characterized in that: The printing equipment is a gravure printing machine, a screen printing machine, a coating machine and an offset printing machine.