Self-heating film material as well as preparation method and application thereof

Abstract

The invention provides a self-heating film material and a preparation method and application thereof. The self-heating film material comprises positive electrode powder and metal negative electrode powder which are mixed with each other; the positive electrode powder comprises a carbon-based material. The self-heating film material with the sheet structure is prepared by mixing the positive electrode powder and the negative electrode powder, the self-heating film material is in contact with the alkaline electrolyte during use, and the alkaline electrolyte can be in contact with the positive electrode material and the negative electrode material at the same time, so that the short-circuit reaction of the metal-air battery is triggered, and further heating is realized. The self-heating film material has the advantages of being rapid in heating, controllable in temperature, long in heating time and the like; air isolation is not needed during storage, and storage is more convenient; exogenous water and high-temperature triggering conditions are not needed during reaction, no dangerous product is generated, and the safety coefficient is high.

Description

Technical Field

[0001] The present application relates to the technical field of self-heating materials, and in particular to a self-heating film material and a preparation method and application thereof. Background Art

[0002] Self-heating technology was originally developed to meet the needs of military field operations. It is mainly used for self-heating food for individual soldiers, of which self-heating materials are the core component. Self-heating materials refer to materials that can generate heat through chemical reactions or physical processes, among which chemical reaction self-heating materials are the most common. The principle is that when a chemical heating agent comes into contact with specific conditions, such as air, moisture or other chemicals, a chemical reaction will occur and release heat.

[0003] The earliest self-heating technology used the hydration reaction of quicklime to release heat, that is, heat is released during the reaction of CaO and H2O to generate Ca(OH)2. The advantage of this reaction is that no harmful gases are produced, but it also has many disadvantages, such as low heat release, easy moisture absorption of the heating pack, and short shelf life. Based on these defects, this type of self-heating material has been gradually eliminated.

[0004] At present, the commonly used self-heating materials mainly include aluminum heat reaction type, iron oxidation corrosion exothermic type, redox reaction type, aluminum water reaction type and magnesium water reaction type. However, the self-heating materials based on the above reactions have some shortcomings, such as slow heating rate, too violent reaction, need for external conditions to catalyze the reaction and difficult to control the temperature.

[0005] Therefore, traditional self-heating materials need further improvement. Summary of the invention

[0006] Based on this, one or more embodiments of the present application provide a self-heating film material that is easy to use, heats quickly, and has controllable temperature, as well as a preparation method and application thereof.

[0007] According to a first aspect of the present application, a self-heating film material is provided, comprising a positive electrode powder and a metal negative electrode powder mixed with each other; the positive electrode powder comprises a carbon-based material.

[0008] In some embodiments, the mass ratio of the positive electrode powder to the metal negative electrode powder is (0.5~0.75):1.

[0009] In some of the embodiments, the thickness of the self-heating film material is 0.5 mm to 1 mm.

[0010] In some embodiments, the metal negative electrode powder includes one or more of aluminum powder, magnesium powder, zinc powder and iron powder;

[0011] Optionally, the particle size of the metal negative electrode powder is 200 mesh to 400 mesh.

[0012] In some embodiments, the carbon-based material includes one or more of activated carbon, graphite, expanded graphite, carbon nanotubes, graphene, conductive carbon black and acetylene black.

[0013] In some embodiments, the positive electrode powder further comprises one or more of a catalyst and a binder;

[0014] Optionally, the catalyst includes one or more of noble metals and alloys thereof, transition metal oxides, transition metal sulfides, functionalized carbon materials and metal nitrides;

[0015] Optionally, the binder includes one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl alcohol and potassium polyacrylate.

[0016] According to the second aspect of the present application, a method for preparing the above-mentioned self-heating film material is provided, comprising the following steps:

[0017] Mixing positive electrode powder, metal negative electrode powder and solvent to obtain mixed slurry;

[0018] The mixed slurry is coated on a substrate, dried and formed to obtain the self-heating film material.

[0019] In some embodiments, the mixing of the positive electrode powder, the metal negative electrode powder and the solvent comprises the following steps:

[0020] The carbon-based material is mixed with the solvent, and then ground and dispersed to obtain a positive electrode slurry;

[0021] The positive electrode slurry is mixed with the metal negative electrode powder, and ultrasonically vibrated.

[0022] In some embodiments, the drying and molding temperature is 25°C to 40°C.

[0023] According to a third aspect of the present application, a self-heating component is provided, comprising an alkaline electrolyte and the self-heating film material described above, wherein the alkaline electrolyte and the self-heating film material are placed separately.

[0024] In some embodiments, the alkaline electrolyte includes one or more of potassium hydroxide and its hydrates, sodium hydroxide and its hydrates, lithium hydroxide and its hydrates, calcium hydroxide and its hydrates, potassium carbonate and its hydrates, sodium carbonate and its hydrates, lithium carbonate and its hydrates, calcium carbonate and its hydrates, potassium bicarbonate and its hydrates, sodium bicarbonate and its hydrates, lithium bicarbonate and its hydrates, and calcium bicarbonate and its hydrates.

[0025] According to a fourth aspect of the present application, a self-heating device is provided, comprising the above-mentioned self-heating component.

[0026] According to a fifth aspect of the present application, an application method of the above-mentioned self-heating device is provided, wherein an alkaline electrolyte is brought into contact with a self-heating material.

[0027] According to a sixth aspect of the present application, a heated cigarette smoke body is provided, comprising an aerosol matrix, cigarette paper and the above-mentioned self-heating device; the self-heating device comprises a self-heating film material and an alkaline electrolyte;

[0028] The cigarette paper is wrapped around the outside of the aerosol matrix, and the self-heating film material is located between the aerosol matrix and the cigarette paper; the alkaline electrolyte is placed separately from the self-heating film material.

[0029] According to a seventh aspect of the present application, a heated cigarette is provided, comprising the heated cigarette smoke-generating body described above.

[0030] Compared with the traditional technology, this application has the following beneficial effects:

[0031] The present application mixes the positive electrode material and the negative electrode material to form a sheet-like self-heating film material. When in use, the self-heating film material is contacted with an alkaline electrolyte. The alkaline electrolyte can contact the positive electrode material and the negative electrode material at the same time, thereby triggering a short-circuit reaction of the metal-air battery, and then generating heat. The self-heating film material of the present application has the advantages of rapid heating, controllable temperature, and long-lasting heating time; it does not need to be isolated from the air during storage, and storage is more convenient; it does not need to provide exogenous water and high-temperature triggering conditions during the reaction, and no dangerous products are generated, and the safety factor is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of the structure of heating the cigarette smoke body in the embodiment of the present application.

[0034] Explanation of reference numerals: 10, aerosol matrix; 20, cigarette paper; 30, self-heating film material. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the present application, etc. can be purchased from the market or can be prepared by existing methods.

[0037] There are many types of self-heating materials commonly used in traditional technologies, but there are still some inevitable defects. For example: high requirements for the storage environment and the need to be isolated from the air; the need to add exogenous water to start the reaction or high temperature conditions to start the reaction, and the reaction is violent and difficult to control; dangerous substances such as hydrogen will be produced during the reaction, posing a safety risk; the heating rate is slow and the maximum temperature that can be reached is low.

[0038] Self-heating materials have been widely used in the fields of healthcare, food, new energy, daily life, and industry, and different application fields have different requirements for self-heating materials. For example, when applied to the field of healthcare, the heating temperature generally needs to be controlled between 40℃ and 60℃, which can achieve the therapeutic effect of promoting blood circulation and relieving pain without scalding the skin due to excessive temperature; when applied to the field of food, on the one hand, it is required that the self-heating material cannot migrate harmful substances into the food when in contact with the food packaging or container; on the other hand, the cost is required to be as low as possible.

[0039] The heating device in the heated cigarette does not cause the cigarette to burn directly. Its working principle is to heat the tobacco segments to a certain temperature through the heating device, so that the tobacco in the tobacco segments produces aerosol, thereby releasing nicotine and other effective ingredients for use. The applicant has found through a lot of practice that the introduction of self-heating materials in heated cigarettes can partially replace the heat released by the heating device; traditional self-heating materials cannot meet the application requirements of heated cigarettes.

[0040] Some embodiments of the present application provide a self-heating film material, the components of which include a positive electrode powder and a metal negative electrode powder mixed with each other; the positive electrode powder includes a carbon-based material.

[0041] The present application prepares a self-heating film material with a sheet structure by mixing positive electrode powder and negative electrode powder. When in use, the self-heating film material is contacted with an alkaline electrolyte. The alkaline electrolyte can contact the positive electrode powder and the negative electrode powder at the same time, thereby triggering a short-circuit reaction of the metal-air battery and achieving heat generation.

[0042] In some of the embodiments, the mass ratio of the positive electrode powder to the negative electrode powder is (0.5~0.75):1.

[0043] As an example, the mass ratio of the positive electrode material to the negative electrode material can be 0.5:1, 0.51:1, 0.52:1, 0.53:1, 0.54:1, 0.55:1, 0.56:1, 0.57:1, 0.58:1, 0.59:1, 0.6:1, 0.61:1, 0.62:1, 0.63:1, 0.64:1, 0.65:1, 0.66:1, 0.67:1, 0.68:1, 0.69:1, 0.7:1, 0.71:1, 0.72:1, 0.73:1, 0.74:1, 0.75:1, or any value within the range formed by any two of the above point values.

[0044] In some optional embodiments, the mass ratio of the positive electrode powder to the negative electrode powder is (0.5~0.6):1.

[0045] Optionally, the mass ratio of the positive electrode powder to the negative electrode powder is 0.5:1.

[0046] The present application controls the mass ratio of the negative electrode powder to the positive electrode powder within the above range, which can further improve the efficiency of the heat release reaction when in contact with the alkaline electrolyte.

[0047] It can be understood that when the self-heating film material comes into contact with the alkaline electrolyte, the alkaline electrolyte can simultaneously come into contact with the positive electrode powder and the negative electrode powder therein, thereby triggering an exothermic reaction.

[0048] In some of the embodiments, the thickness of the self-heating film material is 0.5 mm to 1 mm.

[0049] As an example, the thickness of the self-heating film material can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or any value within the range formed by any two of the above point values.

[0050] In some embodiments, the metal negative electrode powder includes one or more of aluminum powder, magnesium powder, zinc powder and iron powder.

[0051] In some optional embodiments, the metal negative electrode powder is selected from aluminum powder and magnesium powder; optionally, the mass ratio of aluminum powder to magnesium powder is 8:2.

[0052] In some optional embodiments, the metal negative electrode powder is selected from aluminum powder and zinc powder; optionally, the mass ratio of aluminum powder to zinc powder is 8:2.

[0053] In some optional embodiments, the metal negative electrode powder is selected from aluminum powder.

[0054] In some optional embodiments, the particle size of the metal negative electrode powder is 200 mesh to 400 mesh.

[0055] As an example, the particle size of the metal negative electrode powder can be 200 mesh, 225 mesh, 250 mesh, 275 mesh, 300 mesh, 325 mesh, 350 mesh, 375 mesh, 400 mesh, or any value within the range formed by any two of the above point values.

[0056] In some optional embodiments, the particle size of the carbon-based material is 200 mesh to 400 mesh. As an example, the particle size of the carbon-based material can be 200 mesh, 225 mesh, 250 mesh, 275 mesh, 300 mesh, 325 mesh, 350 mesh, 375 mesh, 400 mesh, or any value within the range formed by any two of the above point values.

[0057] It can be understood that in the present application, 200-400 mesh refers to the material under the 200-mesh sieve and the material on the 400-mesh sieve.

[0058] In some embodiments, the carbon-based material includes one or more of activated carbon, graphite, expanded graphite, carbon nanotubes, graphene, conductive carbon black, and acetylene black.

[0059] In some optional embodiments, the carbon-based material is selected from activated carbon and acetylene black.

[0060] In some embodiments, the positive electrode powder further includes one or more of a catalyst and a binder.

[0061] In some optional embodiments, the catalyst includes one or more of noble metals and alloys thereof, transition metal oxides, transition metal sulfides, functionalized carbon materials, and metal nitrides. As an example, the types of catalysts include but are not limited to manganese dioxide.

[0062] In some optional embodiments, the binder includes one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl alcohol and potassium polyacrylate. Optionally, the binder is selected from potassium polyacrylate.

[0063] In some optional embodiments, the positive electrode powder includes activated carbon, acetylene black and a binder. As an example, the mass ratio of activated carbon, acetylene black and the binder is 5:3:2.

[0064] The above-mentioned self-heating film material of the present application does not need to be isolated from the air during storage, and does not need to add exogenous water or exogenous heat to start the reaction, and has the advantages of convenient storage and use; and has the advantages of being light and thin, heating up rapidly, temperature controllable, no risk of combustion and explosion, and high heating efficiency, and can meet the heating needs of heated cigarettes.

[0065] Some other embodiments of the present application provide a method for preparing the above-mentioned self-heating film material, including S10 to S20:

[0066] S10: mixing the positive electrode powder, the metal negative electrode material and the solvent to obtain a mixed slurry,

[0067] S20: coating the mixed slurry onto a substrate, drying and forming the mixed slurry, and obtaining a self-heating film material.

[0068] Understandably, the substrate can be a substrate with a smooth surface such as a glass plate, a resin plate, etc.; the mixed slurry is coated on the surface of the substrate, and the self-heating film material can be obtained by peeling off the substrate after drying and forming.

[0069] In some embodiments, the solvent includes one or more of water, ethanol, N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide and dimethyl sulfoxide. Optionally, the solvent is selected from N-methylpyrrolidone.

[0070] In some embodiments, the step of mixing the positive electrode powder, the metal negative electrode material and the solvent includes S11 to S12:

[0071] S11: mixing the carbon-based material with a solvent, and sequentially grinding and dispersing the mixture to obtain a positive electrode slurry;

[0072] S12: Mix the positive electrode slurry with the metal negative electrode powder, and obtain a mixed slurry by ultrasonic vibration.

[0073] In some optional embodiments, the content of solid matter in the positive electrode slurry is 25 g / mL.

[0074] In some optional embodiments, the ultrasonic oscillation time is more than 30 minutes. It is understandable that the ultrasonic oscillation time is not limited to the above, as long as the slurry can be mixed evenly and stably.

[0075] In some embodiments, the drying and molding temperature in S20 is 25°C to 40°C.

[0076] As an example, the drying temperature can be 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, or any value within the range formed by any two of the above point values.

[0077] The preparation method of the self-heating film material of the present application has the advantages of simple process, rapidity and high efficiency.

[0078] Some other embodiments of the present application provide a self-heating component, including an alkaline electrolyte and the self-heating film material described above, wherein the alkaline electrolyte and the self-heating film material are placed separately.

[0079] In some embodiments, the alkaline electrolyte includes one or more of potassium hydroxide and its hydrates, sodium hydroxide and its hydrates, lithium hydroxide and its hydrates, calcium hydroxide and its hydrates, potassium carbonate and its hydrates, sodium carbonate and its hydrates, lithium carbonate and its hydrates, calcium carbonate and its hydrates, potassium bicarbonate and its hydrates, sodium bicarbonate and its hydrates, lithium bicarbonate and its hydrates, and calcium bicarbonate and its hydrates.

[0080] In some optional embodiments, the alkaline electrolyte is a liquid electrolyte. It can be understood that the liquid electrolyte can quickly and fully contact with the positive electrode material and the negative electrode material to achieve efficient heat generation.

[0081] Other embodiments of the present application provide a self-heating device, comprising the self-heating component described above.

[0082] Some other embodiments of the present application provide an application method of the above-mentioned self-heating device, comprising the following steps: bringing an alkaline electrolyte into contact with a self-heating film material.

[0083] Some other embodiments of the present application provide a heated cigarette smoke body, comprising an aerosol matrix 10, a cigarette paper 20 and the above-mentioned self-heating device 30; the self-heating device comprises a self-heating film material 31 and an alkaline electrolyte 32;

[0084] In some specific embodiments, the structure of the heated cigarette smoking body is as follows Figure 1 shown.

[0085] The cigarette paper 20 is wrapped around the outer side of the aerosol matrix 10 , and the self-heating film material 30 is located between the aerosol matrix 10 and the cigarette paper 20 .

[0086] The heated cigarette smoke body of the present application can quickly release a certain amount of heat by bringing the alkaline electrolyte into contact with the self-heating film material 30 during use, thereby reducing the amount of heat required to be provided by the external heating device.

[0087] As an example, the alkaline electrolyte in the heated cigarette is dripped onto the surface of the self-heating film material through a syringe.

[0088] Some embodiments of the present application also provide a heated cigarette, comprising the heated cigarette smoke-generating body described above.

[0089] In some of the embodiments, the heated cigarette further includes a hollow section and a filter section; the filter section, the hollow section and the heated cigarette smoking body are arranged in sequence.

[0090] The present application will be further described below in conjunction with specific examples and comparative examples, but they should not be construed as limiting the scope of protection of the present application. The raw materials involved in the following specific examples, unless otherwise specified, can all be sourced from commercial sources, the instruments used, unless otherwise specified, can all be sourced from commercial sources, and the processes involved, unless otherwise specified, are all conventionally selected by those skilled in the art.

[0091] Example 1

[0092] (1) In terms of mass percentage, 50 wt% activated carbon, 30 wt% acetylene black and 20 wt% binder polytetrafluoroethylene were provided and ground for 10 minutes to make them uniformly mixed; an organic solvent N-methylpyrrolidone was added to disperse them until the total content of the solid matter was 25 g / mL, and then ultrasonic vibration was performed for 30 minutes to form a uniform and stable positive electrode slurry.

[0093] Among them, the particle size of activated carbon is 325 mesh, and the particle size of acetylene black is about 30 nm.

[0094] (2) 0.6 g of metal aluminum powder with a particle size of 400 mesh was mixed with 0.3 g of the above-mentioned positive electrode slurry to obtain a composite slurry; the composite slurry was coated on a glass plate and dried at 35°C for 24 h to obtain a self-heating film material with a thickness of 1 mm and a size of 4 cm×4 cm.

[0095] (3) Under a temperature of 26°C, the self-heating membrane material was placed in a glass chromatographic bottle with a mouth diameter of 8 mm, a volume of 4 mL, and a cap. The cap was perforated to allow the insertion of an ultrafine thermocouple. 1 mL of 6 mol / L KOH was dripped onto the self-heating membrane material using a syringe, and the cap was screwed on and the thermocouple wire was inserted. The thermocouple was connected to a temperature sensor to record temperature changes in real time.

[0096] The self-heating film material prepared in Example 1 can reach 50° C. within 8 s after the reaction, and the instantaneous maximum temperature can reach 104.2° C., and can be maintained above 50° C. for 66 s.

[0097] Example 2

[0098] The method is basically the same as Example 1, except that polytetrafluoroethylene is replaced with potassium polyacrylate of the same mass.

[0099] Example 3

[0100] The method is basically the same as Example 1, except that N-methylpyrrolidone is replaced with an equal mass of ethanol.

[0101] Example 4

[0102] It is basically the same as Example 1, except that the aluminum powder is replaced with an aluminum-magnesium alloy powder of equal mass, and the mass ratio of aluminum to magnesium in the aluminum-magnesium alloy powder is 8:2.

[0103] Example 5

[0104] It is basically the same as Example 2, except that the aluminum powder is replaced with an aluminum-magnesium alloy powder of equal mass, and the mass ratio of aluminum to magnesium in the aluminum-magnesium alloy powder is 8:2.

[0105] Example 6

[0106] It is basically the same as Example 1, except that the aluminum powder is replaced with an aluminum-zinc alloy powder of equal mass, and the mass ratio of aluminum to zinc in the aluminum-zinc alloy powder is 8:2.

[0107] Example 7

[0108] It is basically the same as Example 2, except that the aluminum powder is replaced with an aluminum-zinc alloy powder of equal mass, and the mass ratio of aluminum to zinc in the aluminum-zinc alloy powder is 8:2.

[0109] Example 8

[0110] It is basically the same as Example 1, except that the mass ratio of the negative electrode material to the positive electrode slurry is 1:1; specifically, the mass of the negative electrode material is 0.6g, and the mass ratio of the positive electrode slurry is 0.6g.

[0111] Comparative Example 1

[0112] After mixing 0.6 g of aluminum powder with a particle size of 400 mesh and 0.3 g of activated carbon powder with a particle size of 325 mesh, 6 mol / L KOH solution was added dropwise, and a primary cell short-circuit reaction occurred to release heat; a sharp temperature rise was detected in the glass bottle, with the maximum temperature reaching 259.1°C within 5 seconds.

[0113] Comparative Example 2

[0114] A porous aluminum foil with a thickness of 0.05 mm and a porosity of 20% was placed in a glass chromatographic bottle. 1 mL of 6 mol / L KOH was added to the glass chromatographic bottle using a syringe. The bottle cap was screwed on and a thermocouple wire was inserted. The thermocouple was connected to a temperature sensor to record temperature changes in real time.

[0115] When the porous aluminum foil of Comparative Example 2 reacted with KOH, bubbles were generated without a sharp temperature rise, and the highest temperature was only 34.5°C.

[0116] The raw material parameters of the self-heating film materials in the above-mentioned Examples 1-9 and Comparative Examples 1-2 are shown in Table 1, and the heating performance results of the self-heating film materials are shown in Table 2.

[0117] Table 1

[0118]

[0119] Table 2

[0120]

[0121] It can be seen from Examples 1 and 2 that the use of potassium polyacrylate as the binder of the self-heating film material in Example 2 can increase the maximum heating temperature to 125°C, and can last for 85 s above 50°C; it can be seen that compared with polytetrafluoroethylene, the selection of potassium polyacrylate as a binder can improve the heating efficiency of the self-heating film material.

[0122] In Example 3, ethanol is selected as the solvent, and the maximum heating temperature is only 84.7° C.; it can be seen that N-methylpyrrolidone is more suitable as the solvent for the self-heating film material of the present application.

[0123] In Examples 4 to 7, aluminum-magnesium alloy or aluminum-zinc alloy is selected as the negative electrode material of the self-heating film material, but the heating rate of the self-heating film material finally obtained is slowed down and the maximum temperature is reduced.

[0124] Compared with the ratio of positive electrode powder to negative electrode powder of 1:1 in Example 8, the mass ratio of positive electrode powder to negative electrode powder in Examples 1 to 7 is 0.5:1, and the heating performance of the film material is further improved.

[0125] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A self-heating film material, characterized in that: It comprises positive electrode powder and metal negative electrode powder mixed with each other; the positive electrode powder comprises carbon-based material.

2. The self-heating film material according to claim 1, characterized in that: The mass ratio of the positive electrode powder to the metal negative electrode powder is (0.5-0.75):

1.

3. The self-heating film material according to claim 1, characterized in that: The thickness of the self-heating film material is 0.5 mm to 1 mm.

4. The self-heating film material according to any one of claims 1 to 3, characterized in that: The metal negative electrode powder includes one or more of aluminum powder, magnesium powder, zinc powder and iron powder; Optionally, the particle size of the metal negative electrode powder is 200 mesh to 400 mesh.

5. The self-heating film material according to any one of claims 1 to 3, characterized in that: The carbon-based material includes one or more of activated carbon, graphite, expanded graphite, carbon nanotubes, graphene, conductive carbon black and acetylene black.

6. The self-heating film material according to any one of claims 1 to 3, characterized in that: The positive electrode powder further comprises one or more of a catalyst and a binder; Optionally, the catalyst includes one or more of noble metals and alloys thereof, transition metal oxides, transition metal sulfides, functionalized carbon materials and metal nitrides; Optionally, the binder includes one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl alcohol and potassium polyacrylate.

7. The method for preparing a self-heating film material according to any one of claims 1 to 6, characterized in that: The steps include: Mixing positive electrode powder, metal negative electrode powder and solvent to obtain mixed slurry; The mixed slurry is coated on a substrate, dried and formed to obtain the self-heating film material.

8. The method for preparing the self-heating film material according to claim 7, characterized in that: The mixing of the positive electrode powder, the metal negative electrode powder and the solvent comprises the following steps: The carbon-based material is mixed with the solvent, and then ground and dispersed to obtain a positive electrode slurry; The positive electrode slurry is mixed with the metal negative electrode powder, and ultrasonically vibrated.

9. The method for preparing a self-heating film material according to any one of claims 7 to 8, characterized in that: The drying and molding temperature is 25°C to 40°C.

10. A self-heating component, characterized in that: It comprises an alkaline electrolyte and the self-heating film material according to any one of claims 1 to 6, wherein the alkaline electrolyte is placed separately from the self-heating film material.

11. The self-heating component according to claim 10, characterized in that: The alkaline electrolyte includes one or more of potassium hydroxide and its hydrate, sodium hydroxide and its hydrate, lithium hydroxide and its hydrate, calcium hydroxide and its hydrate, potassium carbonate and its hydrate, sodium carbonate and its hydrate, lithium carbonate and its hydrate, calcium carbonate and its hydrate, potassium bicarbonate and its hydrate, sodium bicarbonate and its hydrate, lithium bicarbonate and its hydrate, and calcium bicarbonate and its hydrate.

12. A self-heating device, characterized in that: A self-heating component comprising any one of claims 10 to 11.

13. The application method of the self-heating device according to claim 12, characterized in that: An alkaline electrolyte is brought into contact with the self-heating membrane material.

14. A heated cigarette smoke-generating body, characterized in that: It comprises an aerosol matrix, cigarette paper and the self-heating device according to claim 12; the self-heating device comprises a self-heating film material and an alkaline electrolyte; The cigarette paper is wrapped around the outside of the aerosol matrix, and the self-heating film material is located between the aerosol matrix and the cigarette paper; the alkaline electrolyte is placed separately from the self-heating film material.

15. A heated cigarette, characterized in that: It includes the heated cigarette smoke-generating body as described in claim 14.

Images