Method for preparing body heating graphite, product, and use thereof in heating appliance

Abstract

Disclosed in the present invention are a method for preparing body heating graphite, a product, and a use thereof in a heating appliance. The method comprises: weighing a powder and a binder, wherein the powder is asphalt coke, and the binder is modified asphalt; preheating the asphalt coke; heating the modified asphalt to a molten state; pouring the modified asphalt into the preheated asphalt coke for kneading to obtain a paste; hot rolling the paste, and cooling, then crushing and screening the paste to obtain a mixed powder; subjecting the mixed powder to isostatic pressing forming treatment to obtain a green body sample; and subjecting the formed green body sample to roasting treatment twice to obtain a body heating graphite sample. According to the method for preparing body heating graphite, the product, and the use thereof in a heating appliance provided by the present invention, the whole graphite has heating resistance, generates heat uniformly upon being energized, results in apparently more sufficient hot air, a higher temperature uniformity, and a better heating effect, meets vaping requirements for a baked cigarette, and produces smoke flavor consistency from puff to puff. It is not necessary to combine a porous honeycomb diffuser with other heating elements, and the assembly is more convenient.

Description

Preparation method and product of body heating graphite and its application in heating appliances Technical Field

[0001] The present invention relates to the technical field of heating-without-combustion equipment, and in particular to a preparation method and product of body heating graphite and its application in heating appliances. Background Art

[0002] Current heat-not-burn heating devices use airflow heating (bottom-air heating). This technology primarily uses heating wires / needles to generate heat, which then heats the connected heat-conducting components, rapidly increasing their temperature. This heat then diffuses to the surrounding area, heating the air passing through it and entering the cigarettes, which then heats the cigarettes and produces smoke. With this heating method, areas closer to the heat source (heating wire, heating rod, etc.) have higher temperatures, while areas farther from the heat source have relatively lower temperatures. This results in a large temperature difference in the air used to heat the cigarettes, resulting in poor heating results.

[0003] Therefore, there is an urgent need for a preparation method and product of body heating graphite and its application in heating appliances.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method, product and application of body heating graphite in heating appliances to solve the problems in the above-mentioned prior art. The graphite as a whole can have a heatable resistor, and the whole body will generate heat after power is applied. The hot air that can be obtained is obviously more sufficient, the temperature is more uniform, and the heating effect is better.

[0006] The present invention provides a method for preparing body heating graphite, which comprises the following steps:

[0007] Weighing powder and binder, wherein asphalt coke is used as powder and modified asphalt is used as binder;

[0008] The weighed pitch coke is preheated;

[0009] heating the modified asphalt to a molten state;

[0010] Pour the molten modified asphalt into the preheated asphalt coke and knead it to obtain a paste;

[0011] The paste is taken out and hot-rolled, and after cooling, the paste is crushed and sieved to obtain a mixed powder;

[0012] The mixed powder is subjected to isostatic pressing to obtain a green sample;

[0013] The green sample after forming was calcined twice to obtain a bulk exothermic graphite sample.

[0014] In the method for preparing the body heating graphite as described above, preferably, the weighing of the powder and the binder specifically includes:

[0015] Weighing the modified asphalt, wherein the modified asphalt accounts for 23%-28% of the mixture consisting of asphalt coke and modified asphalt;

[0016] Weigh the pitch coke, wherein the pitch coke is a sieved powder with a particle size of 200 mesh to 325 mesh.

[0017] In the method for preparing the exothermic graphite as described above, preferably, the preheating of the weighed pitch coke specifically comprises:

[0018] Pour the weighed pitch coke into the kneading pot for preheating treatment, wherein the preheating temperature is 150℃-180℃ and the preheating time is 50min-70min.

[0019] The step of heating the modified asphalt to a molten state specifically includes:

[0020] The modified asphalt is heated to above 200°C to convert the solid modified asphalt into a molten state.

[0021] The method for preparing exothermic graphite as described above, wherein preferably, the step of pouring the molten modified asphalt into the preheated asphalt coke for kneading specifically comprises:

[0022] Pour the molten modified asphalt into a kneading pot and knead it with the preheated asphalt coke. The kneading time is 40-50 minutes and the kneading temperature is 170-190°C.

[0023] The method for preparing the body heating graphite as described above, wherein preferably, the paste is taken out and hot-rolled, and after the paste is cooled, it is crushed and sieved to obtain a mixed powder, specifically comprising:

[0024] Take out the kneaded paste from the kneading pot, pour it into the sheet rolling machine, and hot roll it twice at a temperature of 160℃-190℃;

[0025] Allow the paste to cool naturally;

[0026] After the paste is cooled naturally, the paste is crushed;

[0027] The crushed paste is sieved to below 100 mesh to obtain a mixed powder.

[0028] The method for preparing the exothermic graphite as described above, wherein preferably, the isostatic pressing of the mixed powder to obtain a green sample specifically comprises:

[0029] The mixed powder is placed in a steel mold and preformed on a hydraulic four-column press. The molding pressure is 18MPa-22MPa, and the bulk density of the preformed green body is 1.17 / cm 3 -1.21 / cm 3 ;

[0030] After demoulding from the hydraulic four-column press, the green body is placed in a rubber bag and isostatically pressed at a pressure of 110MPa-130MPa.

[0031] The method for preparing the exothermic graphite as described above, wherein preferably, the green sample after forming is subjected to two calcination treatments to obtain the exothermic graphite sample, specifically comprises:

[0032] calcining the green sample after forming to obtain a primary calcined sample;

[0033] The once-calcined sample was impregnated;

[0034] The once-calcined sample after the impregnation treatment is re-baked to obtain a body heating graphite sample.

[0035] In the method for preparing the body-heating graphite as described above, preferably, the green sample after forming is subjected to a single calcination, specifically comprising:

[0036] The green sample after forming is calcined once in a box-type resistance furnace at a temperature of 880°C-920°C. After keeping the temperature for 50-70 minutes, it is naturally cooled to room temperature to obtain a calcined sample.

[0037] The impregnation treatment of the once calcined sample specifically includes:

[0038] Take out the once-baked sample from the box-type resistance furnace;

[0039] Heat and melt the conductive adhesive;

[0040] The once-fired sample is immersed in the melted conductive adhesive for dipping treatment.

[0041] The re-baking treatment of the once-baked sample after the impregnation treatment to obtain the body heating graphite sample specifically includes:

[0042] The once-calcined sample after the impregnation treatment is re-baked in a box-type resistance furnace at a calcination temperature of 1800° C.-2000° C. After being kept warm for 50 min-70 min, it is naturally cooled to room temperature to obtain a body heating graphite sample.

[0043] The present invention also provides body heating graphite, which is obtained by adopting the above-mentioned preparation method.

[0044] The present invention also provides an application of the body heating graphite in a heating appliance. The application method is: copper rings are put on the upper and lower ends of the body heating graphite, and heating can be generated by applying electricity.

[0045] The preparation method, product and application of the body heating graphite in heating appliances of the present invention, compared with the indirect heating diffuser method, make the honeycomb graphite as a whole have a heatable resistor, and generate heat as a whole after being energized. The hot air that can be obtained is obviously more sufficient, the temperature is more uniform, and the heating effect is better; the resistivity of the body heating graphite can reach above 50μΩ·m, and the resistance value of the body heating graphite can reach above 0.5Ω, which can achieve body heating. When power is applied to both ends, the whole body can generate heat, meeting the smoking requirements of flue-cured cigarettes; the air flowing through the body heating graphite can be fully heated, the temperature is uniform, the flue-cured cigarette effect is good, and a stable tobacco aroma is produced with each puff; there is no need to combine the porous honeycomb diffuser with other heating elements as in the past, and the assembly is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0047] FIG1 is a vertical cross-sectional view of a honeycomb diffuser heated by graphite as a resistance heating element;

[0048] Figure 2 is the XRD pattern of phase C graphite;

[0049] FIG3 is a schematic diagram showing the relationship between the resistivity and graphitization degree of a graphitized product;

[0050] FIG4 is a flow chart of an embodiment of a method for preparing body heating graphite provided by the present invention;

[0051] FIG5 is a vertical cross-sectional view of body heating graphite. DETAILED DESCRIPTION

[0052] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0053] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. Terms such as "include" or "comprising" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. Terms such as "upper," "lower," and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intervening component between the specific component and the first component or the second component. When a specific component is described as being connected to another component, the specific component may be directly connected to the other component without an intervening component, or may not be directly connected to the other component but have an intervening component.

[0055] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0056] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0057] Current airflow heating (bottom-air heating) technology heats the air in a porous honeycomb diffuser, which then uses the hot air to heat the cigarettes. In this method, the temperature is higher near the heat source (heating wire, heating rod, etc.), while the temperature is relatively lower farther from the heat source. Therefore, to address this phenomenon, materials with high thermal conductivity are required to minimize temperature differences and ensure a consistent air temperature throughout the cigarettes.

[0058] Graphite currently used for airflow heating, as a porous honeycomb heat diffuser (as shown in Figure 1), requires high thermal conductivity and low heat capacity. Graphite is indeed an excellent thermal conductive material. However, the resistivity of the porous honeycomb graphite currently used is very low, less than 0.1Ω, making it difficult to achieve volume heating.

[0059] The present invention modifies the graphite formulation used as a heat diffuser to achieve a resistance of at least 0.5Ω. This allows the graphite itself to maintain a certain resistance, with the entire graphite having a resistance of 0.5-3Ω. This achieves bulk heating, and when power is applied to both ends, the entire structure heats up, meeting the smoking requirements of flue-cured tobacco. While conventional graphite has a resistivity of 10μΩ·m, the heat-generating graphite produced by the present invention has a resistivity range of 50-500μΩ·m.

[0060] During the graphitization heat treatment process, microstructural analysis and physical and chemical property characterization of graphite products are performed by measuring the g parameter to approximate the degree of graphitization of the product. The degree of graphitization is the degree to which carbon atoms form a close-packed hexagonal graphite crystal structure. The closer the lattice size approaches the lattice constant of ideal graphite, the higher the degree of graphitization. The graphitization process, in which amorphous carbon is converted into graphite, is a transformation from amorphous to crystalline, and its crystallinity is expressed by the degree of graphitization (g parameter).

[0061] Figure 2 shows the XRD pattern of phase C graphite, which is obtained by CuK α As an X-ray source, the X-ray wavelength λ is 0.154nm. According to the 2θ angle corresponding to the characteristic peak of the (002) crystal plane provided by the XRD spectrum in Figure 2, the Bragg law (2d 002 sinθ=λ) calculate the corresponding interplanar spacing d 002 , and then substitute the result into the Merring-Maire formula: The degree of graphitization of graphite products can be approximately calculated.

[0062] For example, the specific calculation process and results are as follows:

[0063] The relationship between resistivity and graphitization degree is shown in Figure 3. As shown in Figure 3, as the degree of graphitization (g parameter) continues to increase, the resistivity of the sample at room temperature shows a downward trend. Graphite-based carbon materials exist in a hexagonal carbon structure of a network type. Due to the diversity of graphite structures, the properties of electrons moving within the layer plane have obvious diversity. According to the formula It can be seen that at room temperature, as the degree of graphitization increases, the interlayer spacing d 002 As the degree of graphitization increases, the carrier concentration at the grain boundaries, which is the main factor affecting the conductivity of carbon materials, increases. At the same time, the order of the crystal grain boundaries improves and the scattering effect weakens, thereby increasing the conductivity of the sample, that is, the resistivity of the sample decreases. The increasing carrier concentration and the weakening grain boundary scattering work together to cause the resistivity to decrease with increasing graphitization degree.

[0064] As shown in Figure 3, in order to control the resistivity of graphite above 50 μΩ·m, the degree of graphitization must be lower than 35%.

[0065] As shown in FIG4 , the preparation method of the body heating graphite provided in this embodiment includes the following steps during actual implementation:

[0066] Step S1, weighing powder and binder, wherein asphalt coke is used as powder and modified asphalt is used as binder.

[0067] Powders, the primary raw materials for graphite production, include petroleum coke, pitch coke, isotropic coke, green coke, mesocarbon microbeads, and flake graphite powder. Petroleum coke and pitch coke are commonly used as powders for graphite production. Pitch coke, a high-quality coke with low ash content, readily graphitizes at high temperatures. Under the same high-temperature conditions, its graphitization degree is lower than that of petroleum coke, and the resulting graphite has a relatively high resistivity. The primary raw material used in this invention is pitch coke, i.e., calcined coal tar pitch.

[0068] In one embodiment of the method for preparing body heating graphite of the present invention, step S1 may specifically include:

[0069] Step S11 , weighing the modified asphalt, wherein the modified asphalt accounts for 23%-28% of the mixture consisting of asphalt coke and modified asphalt.

[0070] In some embodiments of the present invention, the ratio of modified asphalt to the mixture is 25%. It should be noted that the present invention does not impose any specific limitation on the mixing ratio of asphalt coke and modified asphalt.

[0071] Step S12: weighing the pitch coke, wherein the pitch coke is a powder after screening, and its particle size is 200 mesh to 325 mesh.

[0072] Illustratively, the particle size of the pitch coke is 250 mesh. It should be noted that the present invention does not specifically limit the particle size of the pitch coke.

[0073] Step S2: preheating the weighed pitch coke.

[0074] Specifically, the weighed pitch coke is poured into a kneading pot for preheating treatment, wherein the preheating temperature is 150°C-180°C, for example, 160°C, and the preheating time is 50min-70min, for example, 1h. It should be noted that the present invention does not specifically limit the preheating temperature and preheating time of the pitch coke.

[0075] Step S3: heating the modified asphalt to a molten state.

[0076] Specifically, the modified asphalt is heated to above 200°C to convert the solid modified asphalt into a molten state. Compared with the solid state, the mass of the molten modified asphalt is almost unchanged, and the weight loss rate is very small and can be ignored.

[0077] Step S4: pouring the molten modified asphalt into the preheated asphalt coke and kneading them to obtain a paste.

[0078] Specifically, the molten modified asphalt is poured into a kneading pot and kneaded with the preheated asphalt coke. The kneading time is 40 min-50 min, for example, 45 min, and the kneading temperature is 170°C-190°C, for example, 180°C. It should be noted that the present invention does not specifically limit the kneading time and kneading temperature.

[0079] Step S5: taking out the paste and performing hot rolling on the paste. After the paste is cooled, it is crushed and sieved to obtain a mixed powder.

[0080] In one embodiment of the method for preparing body heating graphite of the present invention, step S5 may specifically include:

[0081] Step S51: Take out the kneaded paste from the kneading pot, pour it into a sheet rolling machine, and hot-roll it twice at a temperature of 160° C.-190° C.

[0082] In one embodiment of the present invention, the temperatures of the two hot rolling processes may be the same or different, which is not specifically limited in the present invention.

[0083] Step S52: Cool the paste naturally.

[0084] Step S53: After the paste is cooled naturally, the paste is crushed.

[0085] Among them, the crushing process can be carried out by jaw crusher, ball mill and other equipment.

[0086] Step S54: sieve the crushed paste to a size of less than 100 mesh to obtain a mixed powder.

[0087] Step S6: performing isostatic pressing on the mixed powder to obtain a green sample.

[0088] In one embodiment of the method for preparing body heating graphite of the present invention, step S6 may specifically include:

[0089] Step S61: The mixed powder is placed into a steel mold and preformed on a hydraulic four-column press. The molding pressure is 18 MPa-22 MPa, for example, 20 MPa. The bulk density of the green body after pre-molding is 1.17 / cm 3 -1.21 / cm 3 , for example, 1.19 / cm 3 .

[0090] Step S62: After demoulding from the hydraulic four-column press, the green body is placed in a rubber bag and isostatically pressed at a pressure of 110 MPa-130 MPa (for example, 120 MPa).

[0091] Step S7: calcining the formed green sample twice to obtain a bulk heating graphite sample.

[0092] The final body heating graphite sample is shown in Figure 5. In one embodiment of the method for preparing body heating graphite of the present invention, step S7 may specifically include:

[0093] Step S71 , calcining the formed green sample once to obtain a once-calcined sample.

[0094] Specifically, the formed green sample is calcined once in a box-type resistance furnace at a temperature of 880°C-920°C, for example, 900°C. After keeping the temperature for 50min-70min (for example, 1h), the sample is naturally cooled to room temperature to obtain a once-calcined sample.

[0095] Step S72: performing an impregnation treatment on the once calcined sample.

[0096] In one embodiment of the method for preparing body heating graphite of the present invention, step S72 may specifically include:

[0097] Step S721: taking out the primary calcined sample from the box-type resistance furnace.

[0098] Step S722: Heat and melt the conductive adhesive.

[0099] Step S723: Immerse the once-fired sample in the melted conductive adhesive for immersion treatment.

[0100] The impregnation process mainly involves impregnating graphite with a binder to fill the pores on its surface and inside, and then curing it through heat treatment. The present invention uses a conductive binder heated to a certain temperature to melt the binder, and then immerses the sample in it, which is a hot impregnation process.

[0101] Step S73: re-baking the once-calcined sample after the impregnation treatment to obtain a body heating graphite sample.

[0102] Specifically, the impregnated, once-calcined sample is rebaked in a box-type resistance furnace at a calcination temperature of 1800°C to 2000°C, for example, 2000°C. After holding for 50-70 minutes (e.g., 1 hour), the sample is naturally cooled to room temperature to obtain a bulk exothermic graphite sample. During the primary calcination process, the modified pitch undergoes complex decomposition, polymerization, cyclization, and aromatization reactions, releasing a large amount of volatiles. This volatile release creates a large number of pores in the green body, reducing the bulk density of the sample. The impregnation-rebaking process can increase the bulk density of the sample.

[0103] The resistivity of the body heating graphite obtained by the above preparation method can reach more than 50μΩ·m, and the resistance value of the body heating graphite can reach more than 0.5Ω, which can achieve body heating. When power is applied to both ends, the whole body can be heated, meeting the smoking needs of baked cigarettes; the air flowing through the body heating graphite can be fully heated, the temperature is uniform, the baking effect of the cigarette is good, and a stable tobacco aroma is produced puff by puff.

[0104] In one embodiment of the present invention, three body heating graphite samples were obtained by the above preparation method. The processing conditions and resistivity of each sample are shown in Table 1.

[0105] Table 1 Processing conditions and resistivity of samples 1-3

[0106] As can be seen from Table 1, the resistivity of sample 1 is the largest, which is 50μΩ·m-58μΩ·m; the resistivity of sample 2 is second, which is 41μΩ·m-52μΩ·m; the resistivity of sample 3 is the smallest, which is 38μΩ·m-47μΩ·m. Therefore, the processing conditions of sample 1 are the optimal conditions, that is, the re-baking temperature is preferably 1800℃.

[0107] Furthermore, in another embodiment of the present invention, there is also provided a body heating graphite obtained by the above-mentioned preparation method.

[0108] Furthermore, in another embodiment of the present invention, an application of body heating graphite in a heating device is provided, and the application method is: copper rings are put on the upper and lower ends of the body heating graphite, and heat can be generated by applying electricity.

[0109] The preparation method, product and application of the body heating graphite in heating appliances provided by the embodiments of the present invention, compared with the indirect heating diffuser method, the present invention enables the honeycomb graphite as a whole to have a heatable resistor, and the whole body generates heat after being energized. The hot air that can be obtained is obviously more sufficient, the temperature is more uniform, and the heating effect is better; the resistivity of the body heating graphite can reach more than 50μΩ·m, and the resistance value of the body heating graphite can reach more than 0.5Ω, which can achieve body heating. The whole body can be heated by energizing both ends, meeting the smoking requirements of baked cigarettes; the air flowing through the body heating graphite can be fully heated, the temperature is uniform, the baking effect of the cigarette is good, and a stable tobacco aroma is produced puff by puff; there is no need to combine the porous honeycomb diffuser with other heating elements as in the past, and the assembly is more convenient.

[0110] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0111] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A preparation method of body-heating graphite, characterized in that, It includes the following steps: Weigh the powder material and the binder, where the pitch coke is used as the powder material and the modified pitch is used as the binder; Preheat the weighed pitch coke; Heat the modified pitch to the molten state; Pour the molten modified pitch into the preheated pitch coke for kneading treatment to obtain a paste; Take out the paste, perform hot rolling treatment on the paste, and after the paste cools, perform crushing and screening treatment to obtain a mixed powder; Perform isostatic pressing treatment on the mixed powder to obtain a green body sample; Perform two roasting treatments on the formed green body sample to obtain a bulk heating graphite sample.

2. The preparation method of the body-heating graphite according to claim 1, characterized in that, The weighing of the powder material and the binder specifically includes: Weigh the modified pitch, where the proportion of the modified pitch in the mixture composed of pitch coke and modified pitch is 23%-28%; Weigh the pitch coke, where the pitch coke is the screened powder material with a particle size of 200 mesh - 325 mesh.

3. The preparation method of the body-heating graphite according to claim 1, wherein, The preheating treatment of the weighed pitch coke specifically includes: Pour the weighed pitch coke into a kneading pot for preheating treatment, where the preheating temperature is 150°C - 180°C and the preheating time is 50 min - 70 min, The heating of the modified pitch to the molten state specifically includes: Heat the modified pitch to above 200°C to convert the solid modified pitch into the molten state.

4. The preparation method of the body-heating graphite according to claim 1, wherein, The pouring of the molten modified pitch into the preheated pitch coke for kneading treatment specifically includes: Pour the molten modified pitch into a kneading pot and knead it with the preheated pitch coke. The kneading time is 40 min - 50 min and the kneading temperature is 170°C - 190°C.

5. The preparation method of the body-heating graphite according to claim 1, characterized in that, The taking out of the paste and performing hot rolling treatment on the paste, and after the paste cools, performing crushing and screening treatment to obtain a mixed powder specifically includes: Take out the kneaded paste from the kneading pot, pour it into a rolling mill, and perform hot rolling 2 times at a temperature of 160°C - 190°C; Let the paste cool naturally; After the paste cools naturally, perform crushing treatment on the paste; Screen the crushed paste to below 100 mesh to obtain a mixed powder.

6. The preparation method of the body-heating graphite according to claim 1, wherein, The isostatic pressing treatment of the mixed powder to obtain a green body sample specifically includes: Load the mixed powder into the steel mold and perform pre - forming by die - pressing on a hydraulic four - column press. Among them, the forming pressure is 18 MPa - 22 MPa, and the bulk density of the green body after pre - pressing is 1.17 / cm 3 - 1.21 / cm 3 ; After demolding from a hydraulic four-column press, put the green body into a rubber bag and perform isostatic pressing at a pressure of 110 MPa - 130 MPa.

7. The preparation method of the body-heating graphite according to claim 1, characterized in that The two roasting treatments of the formed green body sample to obtain a bulk heating graphite sample specifically include: Perform one roasting on the formed green body sample to obtain a once-roasted sample; Perform impregnation treatment on the once-roasted sample; Perform re-baking treatment on the impregnated once-roasted sample to obtain a bulk heating graphite sample.

8. The preparation method of the body-heating graphite according to claim 7, characterized in that, The one roasting of the formed green body sample specifically includes: Perform one roasting on the formed green body sample in a box-type resistance furnace. The one roasting temperature is 880°C - 920°C. After holding for 50 min - 70 min, cool naturally to room temperature to obtain a once-roasted sample, The impregnation treatment of the once-roasted sample specifically includes: Take out the once-roasted sample from the box-type resistance furnace; Heat and melt the conductive binder; Immerse the once-roasted sample into the melted conductive binder for impregnation treatment, The once-baked sample after impregnation treatment is subjected to re-baking treatment to obtain a body-heating graphite sample, specifically including: The once-baked sample after impregnation treatment is subjected to re-baking treatment in a box-type resistance furnace. The baking temperature for the re-baking treatment is 1800°C - 2000°C. After holding for 50 min - 70 min, it is naturally cooled to room temperature to obtain a body-heating graphite sample.

9. A body-heating graphite, characterized in that, Obtained by using the preparation method described in any one of claims 1 - 8.

10. Application of the body-heating graphite as described in claim 9 in a heating appliance, characterized in that, The application method is: copper rings are sleeved on the upper and lower ends of the body-heating graphite, and it can generate heat when powered on.

Images