CN111182662A - Graphene electric heating piece, and manufacturing process and application thereof - Google Patents
Graphene electric heating piece, and manufacturing process and application thereof Download PDFInfo
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- CN111182662A CN111182662A CN202010111090.7A CN202010111090A CN111182662A CN 111182662 A CN111182662 A CN 111182662A CN 202010111090 A CN202010111090 A CN 202010111090A CN 111182662 A CN111182662 A CN 111182662A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
Abstract
The invention provides a non-combustion barbecue device made of a graphene electric heating piece. The graphene electric heating piece comprises a positive electrode conductive grid, a negative electrode conductive grid and a graphene electric heating coating, wherein the positive electrode conductive grid and the negative electrode conductive grid are connected through the graphene electric heating coating. The graphene electrothermal coating forms a conductive network with invariable resistivity when electrified and generates heat. And because the resistance value of the graphene electrothermal coating is low, the heating power is high under the condition of constant voltage, the power consumption is low, and the service life is long. The prepared flame-free barbecue moxibustion device is large in heating area, small in power consumption, long in service life, green and environment-friendly, meets the use requirements of smokers, is more beneficial to the smokers to abandon the traditional smoking habit, and reduces the public health hazard caused by smoking of the smokers.
Description
Technical Field
The invention relates to the technical field of reducing environmental pollution, in particular to a graphene electric heating piece, a manufacturing process and application thereof.
Background
Smoking is harmful to health, but smokers are difficult to quit smoking, so the smokers still can see everywhere. In the traditional smoking mode, a large amount of smoke particles are generated by burning tobacco during smoking, so that serious environmental pollution is caused, other people passively smoke and public health is harmed. Under the condition that the smoking ban of the whole people cannot be achieved, the public health hazard caused by smoking of smokers can be reduced as far as possible only by changing the smoking mode.
Non-combustion smoking products which generate heat by utilizing electric energy appear in the market, volatile substances or fragrant substances in the products are evaporated in a mode of heating cigarettes, the requirements of smokers are met under the condition that the cigarettes are not combusted, and the harm to public health caused by smoke is avoided. The non-combustion smoking product comprises a novel cigarette which can enable fragrant substances in the cigarette to volatilize through heating and roasting and a roasting device which can heat and roast the novel cigarette through electric energy heat production, wherein the roasting device is heated through a carbon rod and is also heated through a resistance wire. The carbon rod heating scheme needs ignition to ignite the carbon rod, belongs to disposable fast-consumption articles and can bring about the problem of a large amount of waste; the resistance wire heating scheme has small heating area, and the resistance wire directly used as a roasting device can not roast the non-combustion smoking cigarette in large area due to small heating area, thus the requirement of smokers can not be met; for making resistance wire heating scheme satisfy user's requirement, through the roast face of roast ware of secondary conduction increase, nevertheless will lead to the product to need the battery of bigger electric storage capacity like this, and battery electric storage capacity is big more, and battery cost is big more, and the product volume also can increase thereupon, when increasing product cost, still can bring inconvenience for the smoker, and then, makes the smoker more tend to use traditional smoking mode easily, is unfavorable for reaching the smoking habit purpose that changes the smoker.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the graphene electric heating piece which is reusable, low in energy consumption and large in roasting surface is provided; when the graphene electric heating element is used for heating non-combustion cigarettes, the graphene electric heating element can reduce public health hazards, and further, the purposes of reducing environmental pollution and benefiting public health can be achieved by changing smoking mode habits of smokers.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a graphite alkene is electrically heated, includes anodal conductive grid, negative pole conductive grid and graphite alkene electrically heats the coating, anodal conductive grid with negative pole conductive grid passes through graphite alkene electrically heats the coating and connects.
Further, the graphene electrothermal member further comprises a protective film layer for preventing the graphene electrothermal coating from being oxidized.
Further, the graphene electrothermal member further comprises a supporting substrate for supporting the graphene electrothermal coating, and the graphene electrothermal coating is located between the supporting substrate and the protective film layer.
Further, the support substrate is in a cylindrical tubular shape; the positive conductive grid is composed of at least two first arc strips and a positive conductive connecting part for connecting the first arc strips; the negative conductive grid is composed of at least two second arc strips and a negative conductive connecting part for connecting the second arc strips; the first arc strips and the second arc strips are arranged on the side wall of the supporting base material in an alternating mode.
Further, the first arc strip and the second arc strip are perpendicular to the axis of the supporting base material, and the positive conductive connecting portion and the negative conductive connecting portion are parallel to the axis of the supporting base material.
Further, the protective film layer is an enamel coating layer, and the support base material is a ceramic base material.
A manufacturing process of a graphene electrothermal piece comprises the following steps of:
s1: and printing a conductive grid material on the outer wall of the support base material according to a required pattern, and sintering to form the positive conductive grid and the negative conductive grid.
S2: and coating the graphene conductive slurry on the outer wall of the support base material according to a required pattern, covering the graphene conductive slurry on the anode conductive grid 12 and the cathode conductive grid 13, and drying to form the graphene electrothermal coating for connecting the anode conductive grid and the cathode conductive grid.
S3: and coating a protective film layer material on the graphene electrothermal coating, and sintering to form the protective film layer, thus obtaining the graphene electrothermal piece.
Further, in step S2, the graphene conductive paste includes 0.5 to 4% by mass of graphene dispersed in liquid sodium silicate; drying at 200-230 deg.C in oxygen-free environment after coating.
Further, in step S2, the graphene conductive paste is composed of the following components in percentage by mass: 1-3% of graphene, 0.2-0.5% of carbon nano tube and the balance of liquid sodium silicate; the coating thickness is 50 μm to 80 μm.
Further, in step S3, the protective film material is an enamel coating film material prepared by mixing a glaze system and a flux system and then performing high-speed ball milling; the glaze material system is Na2O-MgO-BaO-ZnO-B2O3-SiO2The fluxing agent system is talcum powder; after coating, sintering at 550-600 deg.C in oxygen-free environment.
Further, in step S1, the supporting substrate is a ceramic substrate, and the conductive grid material is a conductive silver paste; the conductive silver paste takes nano glass powder as a binding phase; after printing and drying, sintering at 550-600 ℃ in an oxygen-free environment.
The application of the graphene electric heating element is used as a non-combustion barbecue moxibustion device, and the non-combustion barbecue moxibustion device comprises the graphene electric heating element and a cavity for placing an object to be roasted; the graphene electric heating piece is located on the side wall of the cavity.
Furthermore, the non-combustible barbecue moxibustion device also comprises a power supply which is connected with the positive conductive grid and the negative conductive grid.
Furthermore, the firing-free barbecue moxibustion device further comprises an outer supporting shell, and the outer supporting shell is sleeved on the outer wall of the graphene electric heating element.
Furthermore, a first opening and a second opening are respectively arranged at two ends of the outer supporting shell; the cavity is cylindrical and is coaxial with the support substrate; the cavity is communicated with the outside of the roasting device through the first opening and the second opening respectively.
The invention has the beneficial effects that: graphene sheet-like materials in the graphene electrothermal coating form a conductive network and generate heat when electrified. The resistance value of the graphene electrothermal coating is low, so that the graphene electrothermal coating can generate heat under the condition of low voltage, the power consumption is low, and the service life is long. In a word, the graphene electric heating element is a heating element which can be repeatedly used, has low energy consumption and large heating area. When the device is applied to non-combustion smoking products, namely a non-combustion barbecue moxibustion device, the product has the advantages of large heating area, less power consumption, long service life, environmental protection, more satisfaction of the use requirements of smokers, more contribution to the smokers to abandoning the traditional smoking habit, and reduction of public health hazards caused by smoking of the smokers.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
Fig. 1 is a schematic diagram of a detailed structure of a positive electrode conductive grid and a negative electrode conductive grid of a graphene electrothermal piece according to the present invention;
fig. 2 is a schematic structural view of a positive and negative electrode conductive grid of a graphene electrothermal member after the side wall is unfolded;
FIG. 3 is a cross-sectional view of a first arc-shaped bar of the non-combustible barbecue moxibustion device of the present invention;
FIG. 4 is a schematic cross-sectional view of a second arc-shaped bar of the non-combustible barbecue moxibustion device of the present invention;
FIG. 5 is a schematic cross-sectional view of the graphene electrothermal coating of the non-combustible barbecue moxibustion device of the present invention;
FIG. 6 is an external view of the non-combustible barbecue moxibustion device of the present invention;
FIG. 7 is a cross-sectional view of the over-axis of the non-combustible barbecue moxibustion device of the present invention;
the method comprises the following steps of 1-a graphene electric heating piece, 11-a graphene electric heating coating, 12-a positive electrode conductive grid, 121-a first arc strip, 122-a positive electrode conductive connecting part, 13-a negative electrode conductive grid, 131-a second arc strip, 132-a negative electrode conductive connecting part, 14-a protective film layer and 15-a supporting substrate; 2-cavity, 21-first opening, 22-second opening; 3-outer support shell.
Detailed Description
The most key concept of the invention is as follows: by manufacturing the coating containing the graphene material, the device containing the graphene electrothermal coating with large heating area, low energy consumption and long service life is formed.
In order to further explain the feasibility of the inventive concept, the detailed description of the embodiments according to the technical content, the constructional features, the objectives and the effects achieved will be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1 and 2, a graphene electric heating element 1 includes a positive electrode conductive grid 12, a negative electrode conductive grid 13, and a graphene electric heating coating 11, wherein the positive electrode conductive grid 12 and the negative electrode conductive grid 13 are connected through the graphene electric heating coating 11. And the graphene electrothermal coating is conducted after the positive conductive grid and the negative conductive grid are electrified.
From the above description, the beneficial effects of the present invention are: the graphene electrothermal coating 11 containing the graphene material forms a conductive network by using the positive conductive grid 12 and the negative conductive grid 13, and the positive conductive grid 12 and the negative conductive grid 13 generate heat when supplying power to the graphene electrothermal coating 11. The graphene electrothermal coating 11 has low resistance value, can generate heat under the condition of lower voltage, and has low power consumption and long service life. In summary, the graphene electric heating element 1 is a reusable, low-energy-consumption, large-heating-area heating element.
Example 2
On the basis of the above embodiment, the graphene electrothermal member 1 further includes a protective film layer 14 for preventing the graphene electrothermal coating 11 from being oxidized. The graphene electrothermal coating 11 is easily oxidized at a high temperature to reduce the service life, so the protection film layer 14 is provided to prevent the oxidation.
Example 3
On the basis of the above embodiments, referring to fig. 3, fig. 4 and fig. 5, the graphene electrothermal member 1 further includes a supporting substrate 15 for supporting the graphene electrothermal coating 11, and the graphene electrothermal coating 11 is located between the supporting substrate 15 and the protective film 14. The support substrate 15, in addition to supporting the graphene electrothermal coating 11, protects the graphene electrothermal coating 11 together with the protective film 14, and prevents the graphene electrothermal coating 11 from being oxidized.
Example 4
On the basis of the above embodiment, the support substrate 15 has a cylindrical tubular shape; the positive conductive grid 12 is composed of at least two first arc strips 121 and a positive conductive connecting part 122 for connecting each first arc strip 121; the negative conductive grid 13 is composed of at least two second arc bars 131 and a negative conductive connecting part 132 for connecting each second arc bar 131; the first arc strips 121 and the second arc strips 131 are alternately arranged on the side wall of the support substrate 15. The other end of the connecting end of the first arc strip 121/the second arc strip 131 and the positive conductive connecting part 122/the negative conductive connecting part 132 is round-head-shaped, the two ends of the positive conductive connecting part 122 and the negative conductive connecting part 132 are round-head-shaped, point temperature increase caused by point discharge is avoided, the phenomenon that the graphene electrothermal coating 11 generates heat unevenly is avoided, and the service life of the graphene electrothermal coating 11 is shortened. The round head arrangement is also beneficial to production and processing. The first arc strips 121 and the second arc strips 131 are arranged on the side wall of the supporting substrate 15 in an alternating manner, so that the problem of uneven current on the graphene electrothermal coating 11 due to the influence of a voltage drop effect after electrification can be avoided, and the uniform heating of the graphene electrothermal coating 11 can be ensured.
Example 5
On the basis of the above embodiment, the first arc strips 121 and the second arc strips 131 are both perpendicular to the axis of the support substrate 15, and the positive conductive connecting portion 122 and the negative conductive connecting portion 132 are both parallel to the axis of the support substrate 15, so as to ensure that the current on the graphene electrothermal coating 11 is uniformly distributed and uniformly heated after being electrified. The first arc strip 121 and the second arc strip 131, the positive conductive connecting part 122 and the negative conductive connecting part 132 are prepared by printing and coating conductive silver paste.
Example 6
In any of the above embodiments, the protective film layer 14 is an enamel coating layer, and the support substrate 15 is a ceramic substrate. The enamel coating layer is formed by sintering, has the characteristics of scratch resistance, high temperature resistance, corrosion resistance and the like, and effectively blocks oxygen from penetrating. The ceramic substrate adopts high-purity aluminum oxide (99% Al) with the characteristics of high strength, high hardness, high temperature resistance, corrosion resistance, oxidation resistance and the like2O3) And (4) manufacturing the material. The enamel coating layer and the ceramic substrate jointly protect the graphene electrothermal coating 11 and prevent the graphene electrothermal coating 11 from being oxidized. In addition, the ceramic substrate has good heat conducting performance, and can conduct heat generated by the graphene electrothermal coating quickly and be used for heating non-burning cigarettes.
Example 7
The graphene electrothermal member 1 according to any one of embodiments 1 to 6 may be manufactured according to the following manufacturing process, where the manufacturing process includes the following steps performed in sequence:
s1: a conductive grid material is printed on the outer wall of the support substrate 15 according to a desired pattern, and then sintered to form the positive electrode conductive grid 12 and the negative electrode conductive grid 13.
S2: and coating the graphene conductive slurry on the outer wall of the support base material 15 according to a required pattern, covering the graphene conductive slurry on the positive electrode conductive grid 12 and the negative electrode conductive grid 13, and drying to form the graphene electrothermal coating 11 for connecting the positive electrode conductive grid 12 and the negative electrode conductive grid 13.
S3: and coating a protective film layer material on the graphene electrothermal coating 11, and sintering to form a protective film layer 14 to obtain the graphene electrothermal member 1.
Example 8
The graphene electrothermal member 1 according to any one of embodiments 1 to 6 may be manufactured according to the following manufacturing process, where the manufacturing process includes the following steps performed in sequence:
s1: a conductive grid material is printed on the outer wall of the support substrate 15 according to a desired pattern, and then sintered to form the positive electrode conductive grid 12 and the negative electrode conductive grid 13.
S2: coating graphene conductive slurry on the outer wall of the support base material 15 according to a required pattern, covering the graphene conductive slurry on the positive electrode conductive grid 12 and the negative electrode conductive grid 13, and then drying the graphene conductive slurry at 200-230 ℃ in an oxygen-free environment to form a graphene electrothermal coating 11 for connecting the positive electrode conductive grid 12 and the negative electrode conductive grid 13; the graphene conductive slurry comprises 0.5-4% of graphene by mass percentage dispersed in liquid sodium silicate. Preferably, the graphene conductive paste comprises the following components in percentage by mass: 1-3% of graphene, 0.2-0.5% of carbon nano tube and the balance of liquid sodium silicate. Preferably, the coating thickness of the graphene conductive paste is 50-80 μm.
S3: and coating a protective film layer material on the graphene electrothermal coating 11, and sintering to form a protective film layer 14 to obtain the graphene electrothermal member 1.
The carrier mobility of graphene at room temperature is about 15000cm2V.s, the electron mobility of the graphene is slightly influenced by temperature change, and the electron mobility of the graphene is 15000cm at any temperature between 50 and 500K2and/(V · s) or so. In addition, the graphene has very good heat conduction performance, and the heat conduction coefficient of the graphene is as high as 5300W/mK. The high thermal conductivity of graphene facilitates the thermal conduction of the graphene electrothermal coating 11.
The carbon nano tube has larger specific surface area, and the specific surface area of the carbon nano tube with the diameter of 5-10 nm reaches 230-350 m2And therefore can be spread over a larger area using a smaller mass. The carbon nano tube has higher thermal conductivity, the thermal conductivity of the single-walled carbon nano tube is 6600W/mK at room temperature, the thermal conductivity of the multi-walled carbon nano tube is 3000W/mK, and the graphene is favorably generated by an electric heating coatingHeat transfer.
Example 9
The graphene electrothermal member 1 according to any one of embodiments 1 to 6 may be manufactured according to the following manufacturing process, where the manufacturing process includes the following steps performed in sequence:
s1: a conductive grid material is printed on the outer wall of the support substrate 15 according to a desired pattern, and then sintered to form the positive electrode conductive grid 12 and the negative electrode conductive grid 13.
S2: and coating the graphene conductive slurry on the outer wall of the support base material 15 according to a required pattern, covering the graphene conductive slurry on the positive electrode conductive grid 12 and the negative electrode conductive grid 13, and drying to form the graphene electrothermal coating 11 for connecting the positive electrode conductive grid 12 and the negative electrode conductive grid 13.
S3: coating a protective film layer material on the graphene electrothermal coating 11, and sintering the protective film layer material under the conditions of an oxygen-free environment and a temperature of 550-600 ℃ to form a protective film layer 14 so as to obtain the graphene electrothermal piece 1; the protective film layer material is an enamel coating material prepared by mixing a glaze system and a fluxing agent system and then performing high-speed ball milling; the glaze material system is Na2O-MgO-BaO-ZnO-B2O3-SiO2And the fluxing agent system is talcum powder. The glaze system can adopt ZnO and BaCO3And (4) preparing.
Example 10
The graphene electrothermal member 1 according to any one of embodiments 1 to 6 may be manufactured according to the following manufacturing process, where the manufacturing process includes the following steps performed in sequence:
s1: printing a conductive grid material on the outer wall of the support base material 15 according to a required pattern, and then sintering the conductive grid material under the conditions of an oxygen-free environment and the temperature of 550-600 ℃ to form a positive conductive grid 12 and a negative conductive grid 13; the supporting substrate 15 is a ceramic substrate, and the conductive grid material is conductive silver paste; the conductive silver paste takes nano glass powder as a binding phase.
S2: and coating the graphene conductive slurry on the outer wall of the support base material 15 according to a required pattern, covering the graphene conductive slurry on the positive electrode conductive grid 12 and the negative electrode conductive grid 13, and drying to form the graphene electrothermal coating 11 for connecting the positive electrode conductive grid 12 and the negative electrode conductive grid 13.
S3: and coating a protective film layer material on the graphene electrothermal coating 11, and sintering to form a protective film layer 14 to obtain the graphene electrothermal member 1.
Example 11
The graphene electrothermal member 1 according to any one of embodiments 1 to 6 may be manufactured according to the following manufacturing process, where the manufacturing process includes the following steps performed in sequence:
s1: printing a conductive grid material on the outer wall of the support base material 15 according to a required pattern, and then sintering the conductive grid material under the conditions of an oxygen-free environment and the temperature of 550-600 ℃ to form a positive conductive grid 12 and a negative conductive grid 13; the supporting substrate 15 is a ceramic substrate, and the conductive grid material is conductive silver paste; the conductive silver paste takes nano glass powder as a binding phase.
S2: coating graphene conductive slurry on the outer wall of the support base material 15 according to a required pattern, covering the graphene conductive slurry on the positive electrode conductive grid 12 and the negative electrode conductive grid 13, and then drying the graphene conductive slurry at 200-230 ℃ in an oxygen-free environment to form a graphene electrothermal coating 11 for connecting the positive electrode conductive grid 12 and the negative electrode conductive grid 13; the graphene conductive slurry comprises the following components in percentage by mass: 1-3% of graphene, 0.2-0.5% of carbon nano tube and the balance of liquid sodium silicate; the coating thickness is 50 μm to 80 μm.
S3: coating a protective film layer material on the graphene electrothermal coating 11, and sintering the protective film layer material under the conditions of an oxygen-free environment and a temperature of 550-600 ℃ to form a protective film layer 14 so as to obtain the graphene electrothermal piece 1; the protective film layer material is an enamel coating material prepared by mixing a glaze system and a fluxing agent system and then performing high-speed ball milling; the glaze material system is Na2O-MgO-BaO-ZnO-B2O3-SiO2And the fluxing agent system is talcum powder. The glaze system can adopt ZnO and BaCO3And (4) preparing.
Na mentioned above2O-MgO-BaO-ZnO-B2O3-SiO2Glaze system, ZnO and BaCO for producing glaze system3All are commercially available liquid glaze; conductive silver paste is also a commercially available product.
In the above embodiments 7 to 11, the graphene conductive paste covers the positive electrode conductive grid 12 and the negative electrode conductive grid 13, so as to ensure that the positive electrode conductive grid 12 and the negative electrode conductive grid 13 conduct and energize the graphene electrothermal coating 11, and the layered structure is as shown in fig. 3 to 5; in fig. 3 to 5, only the positional relationship of the layered structures of the respective layers is shown, and the absolute thickness relationship is not represented, for example: the sum of the thicknesses of the protective film layer 14 and the graphene electrothermal coating 11 is not necessarily equal to the thickness of the conductive grid material coating. The oxygen-free environment can be a vacuum environment or a protective gas environment. In actual production, a vacuum sintering furnace can be adopted to realize sintering and drying of the workpiece.
Table 1 resistance value data of graphene electro-thermal parts prepared from graphene conductive pastes of different formulations
The graphene electrocaloric piece 1 of example 6 was fabricated according to the process fabrication steps of example 11 and the various example formulations in table 1. The measurements were performed using a VC890D multimeter and the results of the corresponding resistance values are detailed in Table 1.
As can be seen from the data in Table 1, the samples 1-8 all had no carbon nanotube group added, with sample 6 having the lowest resistance and the best corresponding component ratio. When the mass percentage of the graphene is continuously increased, the effect of uniform dispersion in the grinding process is disturbed, and the resistance value is further increased.
As can be seen from the data in Table 1, samples 9-16 all added carbon nanotubes, with sample 14 having the lowest resistance and the most favorable ratio of the corresponding components. When the mass percentage of the carbon nanotube is continuously increased, the uniform dispersion effect of the grinding process is also disturbed, resulting in an increase in the resistance value.
According to the formula p ═ U2and/R, under the condition that the power supply voltage is not changed, the lower the resistance value is, the higher the heating power is, and the more heat is emitted in unit time. Of the above samples 1-16, sample 14 has the lowest resistance value, and the corresponding graphene is electrically stimulatedThe heat generated by the hot piece 1 is the largest, and the optimal use effect is achieved when the device is applied to a combustion-free barbecue moxibustion device.
From the data in the table, it can be known that adding a proper proportion of one-dimensional carbon nanotubes in a two-dimensional nano graphene sheet material system is beneficial to the composition and optimization of a conductive network.
Example 12
Referring to fig. 3, 4, 5, 6 and 7, an application of a graphene electric heating element 1 as a non-combustion barbecue moxibustion device includes the graphene electric heating element 1 and a cavity 2 for placing an object to be roasted; the graphene electric heating element 1 is positioned on the side wall of the cavity 2. When the device is applied to non-combustion smoking products, namely a non-combustion barbecue moxibustion device, the product has the advantages of large heating area, less power consumption, long service life, environmental protection, more satisfaction of the use requirements of smokers, more contribution to the smokers to abandoning the traditional smoking habit, and reduction of public health hazards caused by smoking of the smokers.
Example 13
On the basis of the structure, the non-combustion barbecue moxibustion device also comprises a power supply which is connected with the positive conductive grid 12 and the negative conductive grid 13. The power supply voltage is safe voltage. The non-combustion barbecue moxibustion device is prepared according to the component proportions of the samples 10, 11, 12 and 14, the temperature of the side wall of the cavity is measured by a temperature tester under the conditions of stable voltage of 3.3V and ambient temperature of 15 ℃, the temperature values all fall within the range of 330-360 ℃, and the requirement of fully evaporating the fragrant substances in the novel cigarette by non-combustion heating can be met.
Example 14
On the basis of the structure, the combustion-free barbecue moxibustion device further comprises an outer supporting shell 3, and the outer supporting shell 3 is sleeved on the outer wall of the graphene electric heating element 1. The outer supporting shell 3 is used for protecting the graphene electric heating piece 1, the protection film layer 14 of the graphene electric heating piece 1 is prevented from being damaged due to long-term grinding and scraping, and the service life of a product is prolonged.
Example 15
On the basis of the structure, the two ends of the outer supporting shell 3 are respectively provided with a first opening 21 and a second opening 22; the cavity 2 is cylindrical, and the cavity 2 is coaxial with the support substrate 15; the cavity 2 is communicated with the exterior of the broil device through the first opening 21 and the second opening 21 respectively. The novel cigarette is cylindrical, the supporting substrate 15 is selected to be a cylindrical structure with a cylindrical cavity at the center, and the cigarette can be conveniently inserted. When heating, the side walls of the cigarette are all heated by the non-combustion barbecue device, and heat is transferred from the side walls of the cigarette to the center of the cigarette, so that the fragrant substances in the cigarette can be quickly and fully baked out. The cigarette is not burnt in the baking process, and smoke particles are not generated.
The conduction mechanism of the graphene electrothermal coating 11 is: the two-dimensional nano graphene sheet-like materials are mutually linked into chains in the coating to form a conductive network, and electrons move in the coating through the network. When the content of the graphene sheet-like material in the coating is low, the average distance between the graphene sheet-like materials in the coating is large, the contact probability is small, the probability of a conductive path is low, and even a conductive path cannot be formed. Finally, when the conductive network is completely formed, the resistivity does not change significantly even if the conductive filler continues to increase.
The conduction mechanism of the graphene electrothermal coating 11 can also be designed according to the tunneling effect theory, which is a special "field emission", and when the distance between conductive particles is less than 10nm, even though there is an insulating layer between the conductive particles, the strong electric field between the particles can generate an emission electric field, thereby forming a current. Accurate calculations can yield data relating to the spacing and distribution of the conductive particles, and the concentration of the conductive particles determines the spacing and distribution of the microscopic particles. When the concentration of the filler is too low, the distance between the conductive particles is too large, and electronic transition cannot occur; only a reasonable concentration of conductive particles can match the proper conductivity. The conductive particles described herein refer to two-dimensional nano-graphene sheet-like materials.
From the above-mentioned conduction mechanism of the graphene electrothermal coating 11, it is reasonable that the graphene electrothermal coating 11 designed by the present application operates under low voltage conditions.
In summary, the graphene electric heating element provided by the invention can be manufactured into a combustion-free roasting device after being manufactured by a processing technology. The combustion-free roasting device is large in heating area, small in power consumption, long in service life, green and environment-friendly, meets the use requirements of smokers, is more beneficial to the smokers to abandon the traditional smoking habit, and reduces the public health hazards caused by smoking of the smokers.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Warm prompt: smoking is harmful to health, please avoid smoking, do not smoke in smoking prohibited places.
Claims (15)
1. The graphene electric heating piece is characterized by comprising a positive electrode conductive grid, a negative electrode conductive grid and a graphene electric heating coating, wherein the positive electrode conductive grid and the negative electrode conductive grid are connected through the graphene electric heating coating.
2. The graphene electrothermal member according to claim 1, further comprising a protective film layer for preventing oxidation of the graphene electrothermal coating.
3. The graphene electro-thermal member of claim 2, further comprising a support substrate for supporting the graphene electro-thermal coating, wherein the graphene electro-thermal coating is located between the support substrate and the protective film layer.
4. The graphene electrothermal member according to claim 3, wherein the support substrate has a cylindrical tubular shape; the positive conductive grid is composed of at least two first arc strips and a positive conductive connecting part for connecting the first arc strips; the negative conductive grid is composed of at least two second arc strips and a negative conductive connecting part for connecting the second arc strips; the first arc strips and the second arc strips are arranged on the side wall of the supporting base material in an alternating mode.
5. The graphene electro-thermal member of claim 4, wherein the first arc-shaped bar and the second arc-shaped bar are perpendicular to an axis of the support substrate, and the positive conductive connecting portion and the negative conductive connecting portion are parallel to the axis of the support substrate.
6. The graphene electrothermal member according to any one of claims 1 to 5, wherein the protective film layer is an enamel coating layer, and the support substrate is a ceramic substrate.
7. A manufacturing process of a graphene electrothermal piece is characterized by comprising the following steps of:
s1: printing a conductive grid material on the outer wall of the support base material according to a required pattern, and then sintering to form a positive conductive grid and a negative conductive grid;
s2: coating graphene conductive slurry on the outer wall of the supporting base material according to a required pattern, covering the graphene conductive slurry on the positive electrode conductive grid 12 and the negative electrode conductive grid 13, and then drying to form a graphene electrothermal coating for connecting the positive electrode conductive grid and the negative electrode conductive grid;
s3: and coating a protective film layer material on the graphene electrothermal coating, and sintering to form the protective film layer, thus obtaining the graphene electrothermal piece.
8. The process for manufacturing the graphene electrothermal member according to claim 7, wherein in step S2, the graphene conductive paste comprises 0.5-4% by mass of graphene dispersed in liquid sodium silicate; drying at 200-230 deg.C in oxygen-free environment after coating.
9. The manufacturing process of the graphene electrothermal member according to claim 8, wherein in step S2, the graphene conductive paste is composed of the following components in percentage by mass: 1-3% of graphene, 0.2-0.5% of carbon nano tube and the balance of liquid sodium silicate; the coating thickness is 50 μm to 80 μm.
10. The process for manufacturing a graphene electrothermal member according to claim 8 or 9, wherein in step S3, the protective film material is an enamel coating film material prepared by mixing a glaze system and a flux system and then performing high-speed ball milling; the glaze material system is Na2O-MgO-BaO-ZnO-B2O3-SiO2The fluxing agent system is talcum powder; after coating, sintering at 550-600 deg.C in oxygen-free environment.
11. The process for manufacturing the graphene electrothermal member according to claim 10, wherein in step S1, the supporting substrate is a ceramic substrate, and the conductive grid material is a conductive silver paste; the conductive silver paste takes nano glass powder as a binding phase; after printing and drying, sintering at 550-600 ℃ in an oxygen-free environment.
12. The application of the graphene electric heating element is characterized in that the graphene electric heating element is used as a combustion-free barbecue moxibustion device, and the combustion-free barbecue moxibustion device comprises the graphene electric heating element as claimed in any one of claims 3 to 6 and a cavity for placing an object to be roasted; the graphene electric heating piece is located on the side wall of the cavity.
13. The use of the graphene electrothermal member according to claim 12, wherein the firing-free barbecue moxibustion device further comprises a power source for connecting the positive conductive grid and the negative conductive grid.
14. The use of the graphene electrothermal element according to claim 13, wherein the flameless barbecuing moxibustion device further comprises an outer support shell, and the outer support shell is sleeved on the outer wall of the graphene electrothermal element.
15. The use of the graphene electrothermal member according to claim 14, wherein the outer support shell has a first opening and a second opening at two ends thereof; the cavity is cylindrical and is coaxial with the support substrate; the cavity is communicated with the outside of the roasting device through the first opening and the second opening respectively.
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| CN202010111090.7A CN111182662A (en) | 2020-02-24 | 2020-02-24 | Graphene electric heating piece, and manufacturing process and application thereof |
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| CN202010111090.7A CN111182662A (en) | 2020-02-24 | 2020-02-24 | Graphene electric heating piece, and manufacturing process and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111671163A (en) * | 2020-07-13 | 2020-09-18 | 诸暨初升新材料科技有限公司 | Preparation method of graphene heat-conducting ceramic heating body of electronic cigarette atomizer |
| CN115746601A (en) * | 2022-09-23 | 2023-03-07 | 深圳烟草工业有限责任公司 | Photosensitive graphene slurry, preparation method thereof and heating device |
-
2020
- 2020-02-24 CN CN202010111090.7A patent/CN111182662A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111671163A (en) * | 2020-07-13 | 2020-09-18 | 诸暨初升新材料科技有限公司 | Preparation method of graphene heat-conducting ceramic heating body of electronic cigarette atomizer |
| CN115746601A (en) * | 2022-09-23 | 2023-03-07 | 深圳烟草工业有限责任公司 | Photosensitive graphene slurry, preparation method thereof and heating device |
| CN115746601B (en) * | 2022-09-23 | 2023-06-20 | 深圳烟草工业有限责任公司 | Photosensitive graphene slurry, preparation method thereof and heating device |
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Application publication date: 20200519 |