Preparation method of an organic nano high-temperature resistant electrothermal film

Abstract

The present invention discloses a preparation method of an organic nano high-temperature resistant electrothermal film. The method comprises the following steps: First, graphite, carbon crystal, carbon black, graphene and an auxiliary agent are mixed to obtain a slurry; Second, a substrate is pasted on an insulating material; Third, the slurry is printed on a substrate; Fourth, the semi-finished material is dried; Fifth, the dried semi-finished material is encapsulated to obtain the organic nano high-temperature resistant electrothermal film. By mixing graphite, carbon crystal, carbon black, graphene and an auxiliary agent and printing them on the substrate in the base, and then drying the auxiliary agent and encapsulating, the organic nano high-temperature resistant electrothermal film obtained has the advantages of good electrical conductivity, high thermal conductivity coefficient, large thermal radiation intensity, high temperature resistance and anti-aging. After the power is turned on, it can reach the stable temperature region after 5 s to 10 s, and has a large amount of heat. The high temperature can reach above 200 °C and can work normally for a long time. The thermal efficiency is as high as over 96%, and it is suitable for the application of AC and DC wide voltages.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrothermal films, and particularly relates to a preparation method of an organic nano high-temperature resistant electrothermal film. Background Art

[0002] In the development of humanity and daily life, the demand for heat energy is always there. Initially, the application of heat energy mainly came from the use of primary energy sources such as firewood, biogas, coal, natural gas, and petroleum. With the increasing development of industry, people have used the secondary conversion method of electric energy to produce various types of electrothermal equipment and appliances, such as electric blankets, electric heaters, hair dryers, physiotherapy instruments, etc., for various purposes and of various types. Electrothermal films are a new type of electrothermal conversion equipment developed in recent years. It is reported that high-voltage low-temperature (220V 60°C) electrothermal films for home heating in South Korea are already on the market, and similar products are also being promoted in China. Although the above-mentioned various products have brought great convenience to people's lives, most of them have the disadvantages of low electric energy utilization rate and poor product quality. When people use high-voltage low-temperature electrothermal appliances for close heating, such as electric blankets, there are great potential safety hazards. Similarly, in some electrothermal films, due to excessive electrode winding, there may be tip discharge or phase-to-phase short circuit, also with great potential safety hazards. In addition, there is no information report on electrothermal films with high voltage and high temperature (220V 200°C) required for multiple uses (such as heating in agricultural greenhouse interiors, etc.).

[0003] Therefore, an organic nano high-temperature resistant electrothermal film is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a preparation method of an organic nano high-temperature resistant electrothermal film in view of the deficiencies of the above-mentioned prior art. This method involves mixing graphite, carbon crystal, carbon black, graphene, and additives, printing them on the substrate material in the base, then drying the additives and encapsulating them to obtain an organic nano high-temperature resistant electrothermal film, which has the advantages of good electrical conductivity, high thermal conductivity coefficient, large thermal radiation intensity, high temperature resistance and anti-aging. After the power is turned on, it can reach the stable temperature range within 5s to 10s, and has a large amount of heat, with a high temperature of over 200°C, and can work normally for a long time, with a thermal efficiency of over 96%, and is suitable for the application of AC and DC wide voltages.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: a preparation method of an organic nano high-temperature resistant electrothermal film, characterized in that the method comprises the following steps:

[0006] Step 1: Preparation of the slurry: Mix graphite, carbon crystal, carbon black, graphene, and additives, and then stir, grind, and ripen them in sequence to obtain the slurry; the additives include a binder, a diluent, an anti-settling agent, a heat-generating agent, and an anti-foaming agent;

[0007] Step 2: Preparation of the substrate: Paste the base material on the insulating material to obtain the substrate;

[0008] Step 3: Printing: Print the slurry obtained in Step 1 on the substrate obtained in Step 2 to obtain a semi-finished material; the slurry is printed on the base material in the substrate;

[0009] Step 4: Drying: Dry the semi-finished material obtained in Step 3 to obtain the dried semi-finished material;

[0010] Step 5: Encapsulation: Encapsulate the dried semi-finished material obtained in Step 4 to obtain the organic nano high-temperature resistant electrothermal film.

[0011] In the present invention, graphite is used as the main material in the slurry, and its function determines the basis of the main performance parameters such as the conductivity, heat conversion, heat conduction and temperature of the electrothermal film. Carbon crystal, carbon black and graphene are auxiliary materials with similar functions to graphite. Among them, carbon crystal assists graphite to enhance thermal infrared radiation, graphene enhances the electrical conductivity and thermal conductivity of graphite, and carbon black fills the gaps between the graphite particle sizes to form the main heating structure of the organic nano high-temperature resistant electrothermal film. The requirements of various technical indicators of the electrothermal film are achieved through the cooperation of these materials and auxiliary materials; the function of the binder is to disperse and carry solid micropowders to form a paste composition, the diluent is used to adjust the thickness of the slurry, the function of the anti-settling agent is to prevent partial solid-liquid stratification or precipitation in the mixed solution from affecting the efficacy and use of the slurry, the function of the heat-generating agent is to increase the substance of heat conduction, quickly conduct and release the heat generated by the electrothermal film, so that the environmental temperature rises rapidly, achieving the effect of quickly increasing the environmental temperature, and the function of the defoaming agent is to eliminate and inhibit the foam generated during the mixing process or storage process of the slurry or the foam being formed, so as to ensure the uniformity and stability of the slurry;

[0012] In the present invention, a substrate is pasted on an insulating material to obtain a base. The function of the insulating material in the base is to prevent line current leakage or arcing during the energized use of the organic nano high-temperature resistant electrothermal film, avoiding short circuits that may cause personal electric shock or fire accidents, preventing unnecessary personal injuries or economic losses. At the same time, the insulating material layer is also a protective layer before and after the organic nano high-temperature resistant electrothermal film. In addition to ensuring the safe use of the electrothermal film, it can also prevent its accidental damage and extend its service life. The function of the substrate is to carry the materials printed with the paste on its surface and increase the service life of the organic nano high-temperature resistant electrothermal film. In the present invention, the paste is printed evenly on the substrate under a certain pressure through printing. In the present invention, part of the additives in the paste printed on the substrate are evaporated through drying, and the remaining part is dried and solidified to form a functional use layer of the organic nano high-temperature resistant electrothermal film that meets the indicators. In the present invention, the required components are completely matched together through encapsulation to form a functional electrothermal film product that is safe, reliable, has good performance, and meets the required specifications and technical indicator requirements.

[0013] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that the slurry in step one is composed of the following components in parts by mass: 20-50 parts of graphite, 0-10 parts of carbon crystal, 10-20 parts of carbon black, 0-15 parts of graphene, 60-150 parts of binder, 15-50 parts of diluent, 5-8 parts of anti-settling agent, 0-6 parts of heat-generating agent, and 6-10 parts of defoaming agent. By controlling various components of the slurry, the present invention ensures that the organic nano high-temperature resistant electrothermal film has optimal electrothermal performance. By controlling the amount of graphite, it avoids the deficiency that the function of the organic nano high-temperature resistant electrothermal film cannot be reflected when the content of graphite is too low, and also avoids the deficiency that the adhesion between the slurry and the substrate becomes poor when the content is too high, resulting in easy peeling of the electrothermal film layer and no function of the organic nano high-temperature resistant electrothermal film. By controlling the amount of carbon crystal, it enhances the infrared intensity of the organic nano high-temperature resistant electrothermal film, which is used for medical and health care functions to enhance the physical fitness of the human body and improve immunity. Excessive use of carbon crystal will also reduce the adhesion of the heating film coating. If the amount used is too small, the effect will be poor. By controlling the amount of carbon black, as a filler for graphite, too much will affect the adhesion between the coating and the substrate and the cost will be too high, while too little will affect the heat conduction performance of the organic nano high-temperature resistant electrothermal film. By controlling the amount of graphene, it enhances the electrical conductivity of the heating film and improves the heating effect. If less is used, the effect is poor, and if more is used, the cost will increase. By controlling the amount of binder, it disperses and carries solid powder and bonds them to form a uniform paste-like mixture for printing use. Excessive use will lead to an increase in resistance and a decrease in function, while too little will result in poor adhesion between components and uneven mixing, affecting the effect of the electrothermal film. By controlling the amount of anti-settling agent, it prevents the stratification and settlement of the slurry. If the amount used is small, the anti-settling effect is poor, and if the amount used is large, it will affect the drying speed. By controlling the amount of heat-generating agent, it can quickly conduct and release the heat energy of the electrothermal film to assist in enhancing the thermal effect of the electrothermal film. Excessive use will also lead to an increase in resistance, and if the amount used is small, the heat conduction effect is poor. By controlling the amount of defoaming agent, it eliminates the bubbles generated during the stirring of the slurry, thereby improving the uniformity of the slurry. If the amount used is small, the defoaming effect is poor, and if the amount used is large, it will dilute the slurry and then affect the printing effect.

[0014] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that in step one, the binder is ethyl cellulose solution, XH-120 series ink or poly-α-methylstyrene resin, the diluent is Z-3, acetone or N,N-dimethylformamide, the anti-settling agent is XD-11, BYK-104 or BYK-163, the heating agent is boron nitride powder, and the defoaming agent is BYK-052 or BYK-055. In the present invention, the binder is selected as ethyl cellulose solution, XH-120 series ink or poly-α-methylstyrene resin because they can well disperse and bond solid powders together and enable the slurry composed of them to bond well with the substrate and have certain adhesion; in the present invention, the diluent is Z-3, acetone, N,N-dimethylformamide, which can be dissolved with other components in the slurry to adjust the thickness of the slurry to ensure the normal operation of printing; in the present invention, the anti-settling agent is XD-11, BYK-104 or BYK-163, which has good compatibility with other additives in the slurry, so that the solid powder and the additive components form a stable slurry mixture without stratification or sedimentation, ensuring the uniform stability of the slurry; in the present invention, the defoaming agent is BYK-052 or BYK-055, both of which are defoaming agents with better defoaming effects suitable for this type of slurry, achieving and meeting the best defoaming effect of this type of slurry.

[0015] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that in step one, the curing time is 24h to 48h. Curing means that after the initial mixing of the mixture, by standing for a period of time, its various components can penetrate and crosslink more fully, making its performance more optimized and perfect. In the present invention, by controlling the curing time, the slurry can penetrate and crosslink fully.

[0016] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that in step two, the insulating material is polytetrafluoroethylene film tape, silicone rubber self-adhesive tape or mica paper tape; the substrate is PET film, PBI film or glass fiber cloth. The present invention adopts polytetrafluoroethylene film tape, silicone rubber self-adhesive tape or mica paper tape, which has the advantages of adhesive layer and substrate adhesive combination, convenient use and good insulation effect. By using PET film, PBI film or glass fiber cloth as the substrate in the present invention, it is convenient to cooperate with the insulating material and is conducive to the printing of the slurry.

[0017] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that in step two, the bonding is carried out at 80°C to 100°C. By controlling the bonding temperature in the present invention, the bonding effect is ensured, and the insulating material and the substrate are tightly connected.

[0018] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that the printing process in step three is as follows: Install the substrate on the printing table plane of the screen printing machine, then put the slurry on the starting side line of the screen plate, and then print the slurry on the substrate in the base to obtain a semi-finished material; The number of printing times is 2 to 3 times. In the present invention, the slurry is printed on the substrate of the base through printing; By controlling the number of printing times, the thickness of the slurry on the substrate is controlled, so as to control the thickness of the active ingredients in the organic nano high-temperature resistant electrothermal film, and make the organic nano high-temperature resistant electrothermal film exhibit various performances according to requirements.

[0019] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that the drying process in step four is as follows: Heat the semi-finished material to 70°C to 90°C and keep it warm for 25 min to 35 min, then heat it to 110°C to 130°C and keep it warm for 15 min to 25 min, then heat it to 140°C to 160°C and keep it warm for 25 min to 35 min, and then heat it to 190°C to 210°C and keep it warm for 15 min to 25 min. In the present invention, through multi-stage heating and heat preservation, various additives are heated and evaporated. Since the volatilization points of various additives are different, different-stage liquid additives are released in stages.

[0020] The preparation method of the above-mentioned organic nano high-temperature resistant electrothermal film is characterized in that the encapsulation process in step five is as follows: Paste two copper foil tapes at both ends of the dried heating film as electrodes, then weld two wires to the copper foil electrode endpoints and fix them, and then encapsulate with an insulating material to obtain an organic nano high-temperature resistant electrothermal film; The insulating material is a polytetrafluoroethylene film tape or a silicone rubber self-adhesive tape. In the present invention, the copper foil tape body has its own adhesive. After cutting the required length, the adhesive surface sticker can be removed and directly pasted on the electrode position of the electrothermal film to be pasted; In the present invention, by pasting two copper foil tapes at both ends of the dried heating film as electrodes, welding external wires on the copper foil and connecting a plug to prepare for connecting to an external power supply for use, the heating principle of the electrothermal film is to obtain heat by the oscillation of carbon atoms in the heating layer of graphite through electricity, and this heat is then transferred out through heat conduction, heat convection and heat radiation.

[0021] The present invention has the following advantages compared with the prior art:

[0022] 1. The present invention prints a mixture of graphite, carbon crystal, carbon black, graphene and additives on the substrate of the base material, then dries the additives and encapsulates them to obtain an organic nano high-temperature resistant electrothermal film. This organic nano high-temperature resistant electrothermal film has the advantages of good electrical conductivity, high thermal conductivity coefficient, large thermal radiation intensity, high temperature resistance and anti-aging, non-toxic, odorless, pollution-free, clean and environmentally friendly during use. It can reach the stable temperature range after being powered on for 5 s to 10 s, and has a large amount of heat. The high temperature can reach above 200 °C and can work normally for a long time, and is suitable for the application of AC and DC wide voltages.

[0023] 2. The organic nano high-temperature resistant electrothermal film prepared by the present invention converts electrical energy into heat energy, avoiding the environmental pollution of the original energy. The thermal efficiency is as high as over 96%, and it saves electricity by 20% to 30% through its high heating performance, realizing clean energy for electrothermal conversion, and can release a large amount of infrared rays beneficial to the human body, and is suitable for applications in medical treatment, hatching, seedling raising and other aspects.

[0024] 3. By adjusting the composition of the slurry, the present invention prepares multiple specifications of products such as high voltage and high temperature, high voltage and low temperature, low voltage and high temperature, and low voltage and low temperature, filling the market gap. Especially the electrothermal film under the human safe voltage is very safe for heating and physiotherapy close to the human body. In addition, when the organic nano high-temperature resistant electrothermal film is encapsulated, it has a high insulation protection layer to ensure the use safety.

[0025] 4. The organic nano high-temperature resistant electrothermal film prepared by the present invention can be matched with a battery to form a warm clothing for use by field workers or for thawing the gasoline engine fuel tank.

[0026] The technical solution of the present invention will be further described in detail below through embodiments. Specific embodiments

[0027] Example 1

[0028] This example includes the following steps:

[0029] Step 1. Preparation of the slurry: Graphite, carbon crystal, carbon black, graphene and additives are successively stirred, ground and aged to obtain the slurry; the additives include a binder, a diluent, an anti-settling agent, a heat-generating agent and an anti-foaming agent; the slurry is composed of the following components in parts by mass: 50 parts of graphite, 10 parts of carbon crystal, 20 parts of carbon black, 10 parts of graphene, 150 parts of binder, 50 parts of diluent, 8 parts of anti-settling agent, 6 parts of heat-generating agent, and 10 parts of anti-foaming agent. The binder is the XH-120 series of inks, and the XH-120 series of inks is the 110 transparent color ink produced by Zhaohui Ink Co., Ltd.; the diluent is N,N-dimethylformamide; the anti-settling agent is XD-11 produced by Zhaohui Ink Co., Ltd.; the heat-generating agent is boron nitride powder, and the anti-foaming agent is BYK-055; the aging time is 24 h.

[0030] Step 2. Preparation of the substrate: A substrate is pasted on the insulating material to obtain the substrate; the insulating material is a polytetrafluoroethylene film tape; the substrate is a PBI film; the bonding is carried out at 90 °C.

[0031] Step 3. Printing: The slurry obtained in Step 1 is printed on the substrate obtained in Step 2 to obtain a semi-finished material; the slurry is printed on the substrate of the substrate; the printing process is as follows: The substrate is installed on the printing table plane of the screen printing machine, then the slurry is placed on the starting side line of the screen plate, and then printed on the substrate of the substrate to obtain a semi-finished material; the number of printing times is 3 times; the printing machine is an SL-5070P / C full-automatic screen printing machine with a conveyor type screen bottom oil scraping screen printing machine.

[0032] Step 4. Drying: The semi-finished material obtained in Step 3 is dried to obtain a dried semi-finished material; the drying process is as follows: The semi-finished material is heated to 80 °C and kept warm for 30 min, then heated to 120 °C and kept warm for 20 min, then heated to 150 °C and kept warm for 30 min, and then heated to 200 °C and kept warm for 20 min.

[0033] Step 5. Encapsulation: The dried semi-finished material obtained in Step 4 is encapsulated to obtain an organic nano high-temperature resistant electrothermal film; the encapsulation process is as follows: Copper foil tape is pasted at both ends of the dried heating film as electrodes, then external wires are welded to the copper foil electrode endpoints and fixed, and then encapsulated with an insulating material to obtain an organic nano high-temperature resistant electrothermal film; the insulating material is a polytetrafluoroethylene film tape.

[0034] After testing, the organic nano high-temperature resistant electrothermal film prepared in this embodiment is used under 220V. After the power is turned on, it can reach the stable temperature range within 5s to 10s. The heating temperature is greater than 200°C, belonging to a high-voltage and high-temperature organic nano high-temperature resistant electrothermal film. The thermal efficiency is 96%, the impact voltage is greater than 1250 volts, the color change temperature of the outer packaging is greater than 250°C, and the insulation resistance under cold and hot conditions is greater than 50Ω.

[0035] Example 2

[0036] This embodiment includes the following steps:

[0037] Step 1: Preparation of the slurry: Graphite, carbon black, graphene and additives are stirred, ground and aged in sequence to obtain the slurry; the additives include a binder, a diluent, an anti-settling agent and an anti-foaming agent; the slurry is composed of the following components by mass: 20 parts of graphite, 10 parts of carbon black, 5 parts of graphene, 60 parts of binder, 15 parts of diluent, 5 parts of anti-settling agent, and 6 parts of anti-foaming agent; the binder is ethyl cellulose solution, the diluent is acetone; the anti-settling agent is BYK-104, and the anti-foaming agent is BYK-052; the aging time is 48h;

[0038] Step 2: Preparation of the substrate: A substrate is pasted on the insulating material to obtain the substrate; the insulating material is silicone rubber self-adhesive tape; the substrate is a PET film; the bonding is carried out at 100°C.

[0039] Step 3: Printing: The slurry obtained in Step 1 is printed on the substrate obtained in Step 2 to obtain a semi-finished material; the slurry is printed on the substrate of the substrate; the printing process is as follows: The substrate is installed on the printing table plane of the screen printing machine, then the slurry is placed on the starting side line of the screen plate, and then printed on the substrate of the substrate to obtain a semi-finished material; the number of printing times is 2 times, and the printing machine is an SL-5070P / C full-automatic screen printing machine with a conveyor belt and a bottom scraping oil screen printing machine;

[0040] Step 4: Drying: The semi-finished material obtained in Step 3 is dried to obtain a dried semi-finished material; the drying process is as follows: The semi-finished material is heated to 70°C and kept warm for 35min, then heated to 110°C and kept warm for 25min, then heated to 140°C and kept warm for 35min, and then heated to 190°C and kept warm for 25min;

[0041] Step 5: Encapsulation: The dried semi-finished material obtained in Step 4 is encapsulated to obtain an organic nano high-temperature resistant electrothermal film; the encapsulation process is as follows: Copper foil tape is pasted at both ends of the dried heating film as electrodes, and then an external wire is welded to the copper foil electrode end points and fixed, and then encapsulated with an insulating material to obtain an organic nano high-temperature resistant electrothermal film; the insulating material is silicone rubber self-adhesive tape.

[0042] After testing, the organic nano high-temperature resistant electrothermal film prepared in this embodiment is used under 220V. After the power is turned on, it can reach the stable temperature region within 5s to 10s. The heating temperature is 40°C to 60°C. It belongs to a high-voltage and low-temperature organic nano high-temperature resistant electrothermal film, with a thermal efficiency of 97%. The impact voltage is greater than 1250 volts, the color change temperature of the outer packaging is greater than 250°C, and the insulation resistance under hot and cold conditions is greater than 50Ω.

[0043] Example 3

[0044] This embodiment includes the following steps:

[0045] Step 1: Preparation of the slurry: Graphite, carbon crystal, carbon black, graphene, and additives are stirred, ground, and aged in sequence to obtain the slurry; the additives include a binder, a diluent, an anti-settling agent, a heating agent, and an anti-foaming agent; the slurry is composed of the following components by mass: 40 parts of graphite, 5 parts of carbon crystal, 15 parts of carbon black, 15 parts of graphene, 130 parts of binder, 40 parts of diluent, 8 parts of anti-settling agent, 6 parts of heating agent, and 8 parts of anti-foaming agent. The binder is the XH-120 series of inks, and the XH-120 series of inks is the 110 transparent color ink produced by Zhaohui Ink Co., Ltd.; the diluent is Z-3 produced by Zhaohui Ink Co., Ltd.; the anti-settling agent is BYK-163, the heating agent is boron nitride powder, and the anti-foaming agent is BYK-055; the aging time is 36h;

[0046] Step 2: Preparation of the substrate: A substrate is pasted on the insulating material to obtain the substrate; the insulating material is mica paper tape, and the substrate is fiberglass cloth; the bonding is carried out at 80°C.

[0047] Step 3: Printing: The slurry obtained in Step 1 is printed on the substrate obtained in Step 2 to obtain a semi-finished material; the slurry is printed on the substrate of the substrate; the printing process is as follows: The substrate is installed on the printing table plane of the screen printing machine, then the slurry is placed on the starting side line of the screen, and then printed on the substrate of the substrate to obtain a semi-finished material; the number of printing times is 3 times; the printing machine is the SL-5070P / C full-automatic screen printing machine with a conveyor type screen bottom oil scraping screen printing machine;

[0048] Step 4: Drying: The semi-finished material obtained in Step 3 is dried to obtain the dried semi-finished material; the drying process is as follows: The semi-finished material is heated to 90°C and kept warm for 25 minutes, then heated to 130°C and kept warm for 15 minutes, then heated to 160°C and kept warm for 25 minutes, and then heated to 210°C and kept warm for 15 minutes;

[0049] Step 5. Encapsulation: Encapsulate the dried semi-finished material obtained in Step 4 to obtain an organic nano high-temperature resistant electrothermal film; the encapsulation process is as follows: Paste copper foil tapes at both ends of the dried heating film as electrodes, then weld external wires to the endpoints of the copper foil electrodes and fix them, and then encapsulate with an insulating material to obtain an organic nano high-temperature resistant electrothermal film; the insulating material is polytetrafluoroethylene film tape.

[0050] After testing, the organic nano high-temperature resistant electrothermal film prepared in this embodiment is used under 48V. After the power is turned on, it can reach the stable temperature range within 5s to 10s. The heating temperature is 80°C to 100°C, belonging to a low-voltage and high-temperature organic nano high-temperature resistant electrothermal film. The thermal efficiency is 97%, the impact voltage is greater than 1250 volts, the color change temperature of the outer package is greater than 250°C, and the insulation resistance under cold and hot conditions is greater than 50Ω.

[0051] Example 4

[0052] This embodiment includes the following steps:

[0053] Step 1. Preparation of slurry: Stir, grind and ripen graphite, carbon crystal, carbon black and additives in sequence to obtain a slurry; the additives include a binder, a diluent, an anti-settling agent, a heating agent and an anti-foaming agent; the slurry is composed of the following components in parts by mass: 30 parts of graphite, 5 parts of carbon crystal, 10 parts of carbon black, 80 parts of binder, 25 parts of diluent, 6 parts of anti-settling agent, 3 parts of heating agent, and 6 parts of anti-foaming agent; the binder is poly-α-methylstyrene resin, the diluent is acetone; the anti-settling agent is BYK-163, the heating agent is boron nitride powder, and the anti-foaming agent is BYK-052; the ripening time is 24h;

[0054] Step 2. Preparation of substrate: Paste a substrate on an insulating material to obtain a substrate; the insulating material is silicone rubber self-adhesive tape; the substrate is a PET film, and the bonding is carried out at 90°C;

[0055] Step 3. Printing: Print the slurry obtained in Step 1 on the substrate obtained in Step 2 to obtain a semi-finished material; the slurry is printed on the substrate of the substrate; the printing process is as follows: Install the substrate on the printing table plane of a screen printing machine, then put the slurry on the starting side line of the screen plate, and then print on the substrate of the substrate to obtain a semi-finished material; the number of printing times is 2 times, and the printing machine is an SL-5070P / C full-automatic screen printing machine with a conveyor type screen bottom oil scraping screen printing machine;

[0056] Step 4. Drying: Dry the semi-finished material obtained in Step 3 to obtain the dried semi-finished material; the drying process is as follows: Heat the semi-finished material to 80 °C and keep it warm for 30 min, then heat it to 120 °C and keep it warm for 20 min, then heat it to 150 °C and keep it warm for 30 min, and then heat it to 200 °C and keep it warm for 20 min;

[0057] Step 5. Encapsulation: Encapsulate the dried semi-finished material obtained in Step 4 to obtain the organic nano high-temperature resistant electrothermal film; the encapsulation process is as follows: Paste copper foil tapes at both ends of the dried heating film as electrodes, then weld external wires to the copper foil electrode endpoints and fix them, and then encapsulate with an insulating material to obtain the organic nano high-temperature resistant electrothermal film; the insulating material is silicone rubber self-adhesive tape.

[0058] After testing, the organic nano high-temperature resistant electrothermal film prepared in this embodiment is used at 24V. After the power is turned on, it can reach the stable temperature range within 5 s to 10 s. The heating temperature is 35 °C to 50 °C. It belongs to a low-voltage and low-temperature organic nano high-temperature resistant electrothermal film. The thermal efficiency is 96%, the impact voltage is greater than 1250 volts, the color change temperature of the outer package is greater than 250 °C, and the insulation resistance under cold and hot conditions is greater than 50 Ω.

[0059] The above is only a preferred embodiment of the present invention and does not impose any limitation on the present invention. Any simple modification, change, and equivalent change made to the above embodiments according to the technical essence of the invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A preparation method of an organic nano high-temperature resistant electrothermal film, characterized in that, The method includes the following steps: Step 1, preparation of the slurry: Mix graphite, carbon crystal, carbon black, graphene and additives, and then perform stirring, grinding and aging in sequence to obtain the slurry; the additives include a binder, a diluent, an anti-settling agent, a heat-generating agent and an anti-foaming agent; the slurry consists of the following components in parts by mass: 20-50 parts of graphite, 0-10 parts of carbon crystal, 10-20 parts of carbon black, 0-15 parts of graphene, 60-150 parts of binder, 15-50 parts of diluent, 5-8 parts of anti-settling agent, 0-6 parts of heat-generating agent, and 6-10 parts of anti-foaming agent; Step 2, preparation of the substrate: Paste a base material on an insulating material to obtain the substrate; Step 3, printing: Print the slurry obtained in Step 1 on the substrate obtained in Step 2 to obtain a semi-finished material; the slurry is printed on the base material in the substrate; the printing process is as follows: Install the base material on the printing table plane of a screen printing machine, then put the slurry on the starting side line of the screen plate, and then print the slurry on the base material in the substrate to obtain a semi-finished material; the number of printing times is 2 to 3 times; Step 4, drying: Dry the semi-finished material obtained in Step 3 to obtain a dried semi-finished material; the drying process is as follows: Heat the semi-finished material to 70°C - 90°C and keep it warm for 25 min - 35 min, then heat it to 110°C - 130°C and keep it warm for 15 min - 25 min, then heat it to 140°C - 160°C and keep it warm for 25 min - 35 min, and then heat it to 190°C - 210°C and keep it warm for 15 min - 25 min; Step 5, encapsulation: Encapsulate the dried semi-finished material obtained in Step 4 to obtain an organic nano high-temperature resistant electrothermal film.

2. The preparation method of an organic nano high-temperature resistant electrothermal film according to claim 1, characterized in that In Step 1, the binder is ethyl cellulose solution, XH-120 series ink or poly-α-methylstyrene resin, the diluent is Z-3, acetone or N,N-dimethylformamide, the anti-settling agent is XD-11, BYK-104 or BYK-163, the heat-generating agent is boron nitride powder, and the anti-foaming agent is BYK-052 or BYK-055.

3. The preparation method of an organic nano high-temperature resistant electrothermal film according to claim 1, characterized in that, In Step 1, the aging time is 24 h - 48 h.

4. The preparation method of an organic nano high-temperature resistant electrothermal film according to claim 1, characterized in that, In Step 2, the insulating material is polytetrafluoroethylene film tape, silicone rubber self-adhesive tape or mica paper tape; the base material is PET film, PBI film or fiberglass cloth.

5. The preparation method of an organic nano high-temperature resistant electrothermal film according to claim 1, characterized in that, In Step 2, the pasting is carried out at 80°C - 100°C.

6. The preparation method of an organic nano high-temperature resistant electrothermal film according to claim 1, characterized in that, In Step 5, the encapsulation process is as follows: Paste two copper foil tapes on both ends of the dried heating film as electrodes respectively, then weld two wires on the copper foil electrode endpoints and fix them, and then encapsulate with an insulating material to obtain an organic nano high-temperature resistant electrothermal film; the insulating material is polytetrafluoroethylene film tape or silicone rubber self-adhesive tape.