Porous ceramic material for electronic cigarette and preparation method thereof

Abstract

The invention discloses a porous ceramic material for an electronic cigarette and a preparation method of the porous ceramic material, and relates to the field of porous ceramic materials. Cotton fibers loaded with nano calcium carbonate are used as a pore-forming agent, after high-temperature sintering, the cotton fibers can be carbonized at high temperature to form pores, calcium carbonate can be further decomposed on the pores to form micron-sized spherical pores, a multi-stage structure of'large-pore oil guiding and small-pore oil locking 'is formed, meanwhile, a carbon skeleton can be left after the cotton fibers are carbonized, and the pore-forming effect is improved. Supporting and reinforcing effects can be achieved in the porous ceramic material, and the risk of breakage is reduced; the porous ceramic for the electronic cigarette is placed in a KH570 silane coupling agent solution, a layer of film is formed on the surfaces of calcium oxide and the ceramic, the wear resistance of the surfaces is improved, erosion of chemical components in tobacco tar can be resisted, the service life of the porous ceramic for the electronic cigarette is prolonged, the lipophilicity of the treated ceramic surface is improved, and the porous ceramic has better tobacco tar adsorption and release performance. According to the prepared porous ceramic material for the electronic cigarette, the strength and the oil guiding performance of the porous ceramic material are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of porous ceramics, and in particular to a porous ceramic material for electronic cigarettes and a preparation method thereof. Background Art

[0002] Porous ceramics, with their excellent resistance to high temperature and high pressure, as well as excellent resistance to acid, alkali and organic corrosion, have shown wide application potential in many fields, including but not limited to filters, catalyst carriers, energy-saving and thermal insulation materials, adsorption materials and sound-absorbing materials. Its preparation process is diverse, covering a variety of mature technical paths such as adding pore-forming agents, foaming, sol-gel and solid-phase sintering. These rich preparation methods have laid a solid foundation for the large-scale production of porous ceramics.

[0003] With the progress of society and the improvement of public health awareness, consumers are increasingly demanding smoking safety. Given that traditional cigarettes are addictive and difficult to quit, e-cigarettes have gradually become the mainstream choice in the market as a new alternative. Among the core components of e-cigarettes, the atomizer plays a key role as a heating element, among which the porous ceramic carrier material used to adsorb the smoke oil is particularly important. This type of inorganic non-metallic porous ceramic material not only has excellent adsorption properties, but also has the characteristics of being non-toxic, safe, reliable, non-flammable and chemically stable. It is worth noting that the porosity, pore size and distribution characteristics of porous ceramics have a decisive influence on the atomization effect and user experience.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a porous ceramic material for electronic cigarettes to solve the problems existing in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a porous ceramic material for an electronic cigarette, comprising the following preparation steps:

[0007] (1) heating and dissolving the binder, then adding ceramic powder, pore-forming agent, sintering aid and modifier, mixing evenly, and kneading to obtain a kneaded material, wherein the pore-forming agent is cotton fiber loaded with nano-calcium carbonate;

[0008] (2) placing the mixed material on a tape casting machine to form a porous ceramic green body;

[0009] (3) degreasing and sintering the porous ceramic green body to obtain a porous ceramic matrix;

[0010] (4) placing the porous ceramic substrate in a KH570 silane coupling agent solution, stirring the reaction for 30 to 60 minutes, filtering out the solid, washing it with ethanol for 2 to 3 times, and washing it with deionized water for 2 to 3 times to obtain a porous ceramic material for electronic cigarettes.

[0011] Furthermore, the porous ceramic material for electronic cigarettes includes the following components in parts by mass: 40 to 75 parts of ceramic powder, 10 to 35 parts of pore formers, 5 to 30 parts of sintering aids, 0.01 to 3 parts of modifiers and 5 to 25 parts of binders.

[0012] Furthermore, the ceramic powder includes one or more of diatomaceous earth, cordierite, alumina, zirconium oxide, silicon carbide, silicon nitride and quartz sand.

[0013] Furthermore, the sintering aid includes one or more of glass powder, metal oxide, alkali metal oxide and transition metal oxide;

[0014] The modifier is one or more of oleic acid, stearic acid and polyamide wax;

[0015] The binder is one or more of paraffin, polyethylene, polypropylene, epoxy resin, phenolic resin and polystyrene.

[0016] Furthermore, the particle size of the ceramic material is 20-30 μm, the length of the cotton fiber is 100-180 μm, the wire diameter is 5-20 μm, and the nano calcium carbonate is 50-100 nm.

[0017] Furthermore, in the step (1), the dissolution temperature of the adhesive is 200-250° C., the mixing is performed by vacuum stirring, the vacuum degree is 300-600 Pa, and the stirring is performed at 600-1200 r / min for 30-45 min.

[0018] Furthermore, the internal kneading in step (1) is performed by mixing the mixture in an internal mixer at a temperature of 60 to 65° C. for 5 to 8 hours.

[0019] Furthermore, in the step (2), the height of the scraper during the casting process is 1.5 to 4.0 mm, the speed of the casting machine is 1.0 to 3.5 cm / s, and the thickness of the porous ceramic green body is 400 to 700 μm.

[0020] Furthermore, in step (3), the debinding is performed by heating the temperature to 200°C at a rate of 0.2-1°C / min, then heating the temperature to 400°C at a rate of 0.5-2°C / min, and keeping the temperature for 1 hour. The debinding sintering temperature is 500-1500°C, and the time is 1-3 hours.

[0021] Furthermore, in step (4), the KH570 silane coupling agent solution is prepared by mixing the KH570 silane coupling agent solution and ethanol in a volume ratio of 0.004 to 0.010:1, and the liquid-to-solid ratio of the KH570 silane coupling agent solution to the porous ceramic matrix is ​​20 to 30 mL / g.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0023] The present invention firstly allows the cotton fiber pore-forming agent loaded with calcium carbonate to be oriented in the ceramic base material, and then hot-presses and molds it to obtain the porous ceramic material for the electronic cigarette, thereby improving the strength and oil-conducting performance of the porous ceramic material.

[0024] First, calcium carbonate is deposited in situ on cotton fibers as a pore-forming agent, and then the cotton fibers are arranged in a direction in the ceramic base material through the cast molding method, and then sintered to obtain porous ceramic materials for electronic cigarettes; after high-temperature sintering, the cotton fibers will be carbonized at high temperature to form pores, and the calcium carbonate will further decompose in the pores to form micron-sized spherical pores, increasing the specific surface area and oil storage capacity, and being able to form a multi-level structure of "large pores for oil conduction + small pores for oil locking", thereby improving the oil conduction efficiency and leak-proof performance. At the same time, the carbonization of cotton fibers will leave a carbon skeleton, and the presence of the carbon skeleton can reduce the sintering shrinkage of the ceramic, maintain the porous structure and stable performance of the material, and the carbon skeleton has high strength and toughness, which can play a supporting and reinforcing role in the porous ceramic material, thereby improving the overall structural stability of the ceramic, enabling it to better disperse stress when subjected to external forces, and reducing the risk of fracture.

[0025] Secondly, after high-temperature decomposition of calcium carbonate, holes will be left in the ceramic, and calcium oxide will be exposed. The porous ceramic matrix is ​​placed in the KH570 silane coupling agent solution to form a film on the surface of calcium oxide and ceramic to fix the calcium oxide particles and other ceramic powders. When subjected to external friction or wear, the calcium oxide particles are not easy to fall off from the matrix, which helps to maintain the integrity of the ceramic matrix and improve its surface wear resistance. It can also resist the erosion of chemical components in the smoke oil, avoid the release of harmful substances, improve the corrosion resistance of ceramics, and extend the service life of porous ceramics for electronic cigarettes. In addition, the lipophilicity of the ceramic surface treated with the silane coupling agent is improved, and it has better smoke oil adsorption and release performance, which improves the user experience. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the porous ceramic material for electronic cigarettes prepared in the following examples are as follows:

[0028] Bending strength: The same mass of porous ceramic materials for electronic cigarettes prepared in the embodiment and the comparative example were tested for their flexural strength according to GB / T1965-1996 “Test method for flexural strength of porous ceramics”.

[0029] Oil conduction speed: For the porous ceramic materials for electronic cigarettes prepared in the embodiment and the comparative example of the same mass, the selected tobacco oil is a mixed oil of propylene glycol: glycerin with a volume ratio of 1:1. A drop of tobacco oil is dropped on the surface of the porous ceramic material for electronic cigarettes with a straw, and the weight of the porous ceramic atomization core before and after oil absorption (the difference in mass before and after is the amount of tobacco oil absorbed by the porous ceramic atomization core) and the time for a drop of tobacco oil to be completely absorbed are recorded. The amount of tobacco oil absorbed per unit time is the oil conduction speed.

[0030] Service life: The service life (hours) of the porous ceramic materials for electronic cigarettes prepared in the embodiment and the comparative example of the same mass = continuous heating at full power under the condition of oil absorption rate greater than 50% until the core becomes sticky, and the heating time is counted.

[0031] Example 1

[0032] A method for preparing a porous ceramic material for an electronic cigarette comprises the following preparation steps:

[0033] (1) placing cotton fibers with a length of 120 μm and a diameter of 10 μm in a 1.5 g / L calcium hydroxide solution, soaking for 30 min, then dipping and rolling, the rolling pressure is 0.3 MPa, the liquid carrying rate of the cotton fibers is 80%, placing the soaked cotton fibers in a container filled with carbon dioxide, and continuously passing carbon dioxide at a flow rate of 300 mL / min, reacting for 30 min, placing the cotton fibers in a 60° C. constant temperature drying oven for drying, deionizing washing twice, and then placing the cotton fibers in a 60° C. constant temperature drying oven for drying to obtain cotton fibers loaded with nano-calcium carbonate;

[0034] (2) taking the following components by weight: 30 parts of diatomaceous earth, 30 parts of quartz sand, 15 parts of cotton fiber loaded with nano-calcium carbonate, 15 parts of glass powder, 0.5 parts of oleic acid and 15 parts of paraffin, the particle size of diatomaceous earth and quartz sand is 20 μm;

[0035] (3) According to the formula, paraffin was heated and dissolved at 200°C, and then ceramic powder, cotton fiber loaded with nano-calcium carbonate, glass powder and oleic acid were added, stirred at a vacuum degree of 300Pa and 600r / min for 30min, and placed in an internal mixer at 60°C for 5 hours to obtain an internal mixer;

[0036] (4) placing the mixed material on a tape casting machine for forming, the scraper height during tape casting was 2.0 mm, the speed of the tape casting machine was 1.5 cm / s, and a porous ceramic green body with a thickness of 400 μm was formed;

[0037] (5) heating the porous ceramic green body to 200° C. at a rate of 0.5° C. / min, then heating it to 400° C. at a rate of 1° C. / min, keeping it at that temperature for 1 h for debinding treatment, and then sintering it at 1000° C. for 2 h to obtain a porous ceramic matrix;

[0038] (6) A silane coupling agent solution was prepared by mixing a KH570 silane coupling agent solution with ethanol at a volume ratio of 0.004:1, and a porous ceramic substrate was placed in the KH570 silane coupling agent solution with a liquid-to-solid ratio of 20 mL / g. After stirring for 30 minutes, the solid was filtered out, washed with ethanol 3 times, and washed with deionized water 3 times to obtain a porous ceramic material for electronic cigarettes.

[0039] Example 2

[0040] A method for preparing a porous ceramic material for an electronic cigarette comprises the following preparation steps:

[0041] (1) placing cotton fibers with a length of 150 μm and a diameter of 15 μm in a 1.5 g / L calcium hydroxide solution, soaking for 30 min, then dipping and rolling, the rolling pressure is 0.3 MPa, the liquid carrying rate of the cotton fibers is 80%, placing the soaked cotton fibers in a container filled with carbon dioxide, and continuously passing carbon dioxide at a flow rate of 300 mL / min, reacting for 35 min, placing the cotton fibers in a 60° C. constant temperature drying oven for drying, deionizing washing 3 times, and then placing the cotton fibers in a 60° C. constant temperature drying oven for drying to obtain cotton fibers loaded with nano-calcium carbonate;

[0042] (2) taking the following components by weight: 30 parts of diatomaceous earth, 35 parts of silicon carbide, 20 parts of cotton fiber loaded with nano-calcium carbonate, 20 parts of glass powder, 1 part of oleic acid and 18 parts of paraffin, the particle size of diatomaceous earth and silicon carbide being 25 μm;

[0043] (3) According to the formula, paraffin was heated to dissolve at 230°C, and then ceramic powder, cotton fiber loaded with nano-calcium carbonate, glass powder and oleic acid were added, stirred at a vacuum degree of 500Pa and 800r / min for 40min, and placed in an internal mixer at 65°C for 6 hours to obtain an internal mixer;

[0044] (4) placing the mixed material on a tape casting machine for forming, the scraper height during tape casting was 2.5 mm, the speed of the tape casting machine was 2.0 cm / s, and a porous ceramic green body with a thickness of 600 μm was formed;

[0045] (5) heating the porous ceramic green body to 200° C. at a rate of 0.5° C. / min, then heating it to 400° C. at a rate of 1.5° C. / min, keeping the temperature for 1 h for debinding treatment, and then sintering it at 1200° C. for 2 h to obtain a porous ceramic matrix;

[0046] (6) A silane coupling agent solution was prepared by mixing a KH570 silane coupling agent solution with ethanol at a volume ratio of 0.007:1, and a porous ceramic substrate was placed in the KH570 silane coupling agent solution with a liquid-to-solid ratio of 25 mL / g. After stirring for 45 minutes, the solid was filtered out, washed with ethanol 3 times, and washed with deionized water 3 times to obtain a porous ceramic material for electronic cigarettes.

[0047] Example 3

[0048] A method for preparing a porous ceramic material for an electronic cigarette comprises the following preparation steps:

[0049] (1) placing cotton fibers with a length of 180 μm and a diameter of 20 μm in a 1.5 g / L calcium hydroxide solution, soaking for 30 min, then dipping and rolling, the rolling pressure is 0.3 MPa, the liquid carrying rate of the cotton fibers is 80%, placing the soaked cotton fibers in a container filled with carbon dioxide, and continuously passing carbon dioxide at a flow rate of 300 mL / min, reacting for 40 min, placing in a 60° C. constant temperature drying oven for drying, deionizing washing 3 times, and then placing in a 60° C. constant temperature drying oven for drying to obtain cotton fibers loaded with nano-calcium carbonate;

[0050] (2) taking the following components by weight: 30 parts of diatomaceous earth, 35 parts of cordierite, 25 parts of cotton fiber loaded with nano-calcium carbonate, 25 parts of glass powder, 1.5 parts of oleic acid and 20 parts of paraffin, the particle size of diatomaceous earth and cordierite being 20 to 30 μm;

[0051] (3) According to the formula, paraffin was dissolved by heating at 250°C, and then ceramic powder, cotton fiber loaded with nano-calcium carbonate, glass powder and oleic acid were added, stirred at a vacuum degree of 600Pa and 1200r / min for 45min, and placed in an internal mixer at 65°C for 8 hours to obtain an internal mixer;

[0052] (4) placing the mixed material on a tape casting machine for forming, wherein the scraper height during tape casting is 4.0 mm, and the speed of the tape casting machine is 3.5 cm / s, to form a porous ceramic green body with a thickness of 700 μm;

[0053] (5) heating the porous ceramic green body to 200° C. at 1° C. / min, then heating it to 400° C. at 2° C. / min, keeping it at that temperature for 1 h for debinding treatment, and then sintering it at 1500° C. for 3 h to obtain a porous ceramic matrix;

[0054] (6) A silane coupling agent solution was prepared by mixing a KH570 silane coupling agent solution with ethanol at a volume ratio of 0.010:1, and a porous ceramic substrate was placed in the KH570 silane coupling agent solution with a liquid-to-solid ratio of 30 mL / g. After stirring for 60 minutes, the solid was filtered out, washed with ethanol 3 times, and washed with deionized water 3 times to obtain a porous ceramic material for electronic cigarettes.

[0055] Comparative Example 1

[0056] The difference between Comparative Example 1 and Example 2 is that there is no step (1), and step (2) is changed to: take the following components in parts by mass: 30 parts of diatomaceous earth, 35 parts of silicon carbide, 20 parts of cotton fiber, 20 parts of glass powder, 1 part of oleic acid and 18 parts of paraffin, and the particle size of diatomaceous earth and silicon carbide is 25 μm; step (3) is changed to: according to the formula, heat and dissolve the paraffin at 230°C, then add ceramic powder, cotton fiber, glass powder and oleic acid, stir at a vacuum degree of 500Pa and 800r / min for 40min, place in an internal mixer at 65°C and mix for 6 hours to obtain an internal mixer; the remaining steps are the same as those in Example 2.

[0057] Comparative Example 2

[0058] The difference between Comparative Example 2 and Example 2 is that there is no step (1), and step (2) is changed to: take the following components in parts by mass: 30 parts of diatomaceous earth, 35 parts of silicon carbide, 20 parts of calcium carbonate, 20 parts of glass powder, 1 part of oleic acid and 18 parts of paraffin, and the particle size of diatomaceous earth and silicon carbide is 25 μm; step (3) is changed to: according to the formula, heat and dissolve the paraffin at 230°C, then add ceramic powder, calcium carbonate, glass powder and oleic acid, stir at a vacuum degree of 500 Pa and 800 r / min for 40 minutes, and place in an internal mixer at 65°C for 6 hours to obtain an internal mixer; the remaining steps are the same as those in Example 2.

[0059] Comparative Example 3

[0060] The difference between Comparative Example 3 and Example 2 is that there is no step (4). Step (4) is changed to: placing the mixed material in a hot die casting machine for hot die casting at a temperature of 80°C and a pressure of 0.5 MPa to obtain a porous ceramic green body; the remaining steps are the same as Example 2.

[0061] Comparative Example 4

[0062] The difference between Comparative Example 4 and Example 2 is that there is no step (6), and step (5) is changed to: the porous ceramic green body is heated to 200°C at 0.5°C / min, and then heated to 400°C at 1.5°C / min, and kept warm for 1 hour for debinding treatment, and then sintered at 1200°C for 2 hours to obtain a porous ceramic matrix, and the porous ceramic matrix is ​​washed with ethanol 3 times and deionized water 3 times to obtain a porous ceramic material for electronic cigarettes; the remaining steps are the same as those in Example 2.

[0063] Effect example

[0064] Table 1 below shows the performance analysis results of the porous ceramic materials for electronic cigarettes using Examples 1 to 3 of the present invention and Comparative Examples 1 to 4.

[0065] Table 1

[0066] Flexural strength(MPa) Oil guide speed (mg / s) Service life (h) Example 1 62 7.7 41 Example 2 63 7.8 42 Example 3 61 7.7 40 Comparative Example 1 55 5.8 33 Comparative Example 2 37 5.6 33 Comparative Example 3 48 5.3 32 Comparative Example 4 57 6.1 21

[0067] From the comparison of the experimental data of Example 2 with those of Comparative Examples 1 and 2, it can be found that after high-temperature sintering of the present invention, the cotton fibers will be carbonized at high temperature to form holes, and the calcium carbonate will further decompose on the holes to form micron-sized spherical pores, thereby increasing the specific surface area and oil storage capacity, and being able to form a multi-level structure of "large pores for oil conduction + small pores for oil locking", thereby improving the oil conduction efficiency and the anti-leakage performance. At the same time, the carbon skeleton left after the carbonization of the cotton fibers can reduce the sintering shrinkage of the ceramic, maintain the porous structure and performance of the material stable, and the carbon skeleton has high strength and toughness, which can play a supporting and reinforcing role in the porous ceramic material, thereby improving the overall structural stability of the ceramic, enabling it to better disperse stress when subjected to external force, and reducing the risk of fracture. From the comparison of the experimental data of Example 2 with those of Comparative Example 3, it can be found that the present invention uses the tape casting method to arrange the cotton fibers in a directional manner in the ceramic base material, and the generated holes The holes will be orderly, which has a positive effect on the bending strength, guiding performance and service life of the porous ceramics; from the comparison of the experimental data of Example 2 and Comparative Example 4, it can be found that after the high-temperature decomposition of calcium carbonate, holes will be left in the ceramics, and the calcium oxide will be exposed. The porous ceramics are placed in a KH570 silane coupling agent solution to form a film on the surface of calcium oxide and the ceramics to fix the calcium oxide particles and other ceramic powders. When subjected to external friction or wear, the calcium oxide particles are not easy to fall off from the matrix, which helps to maintain the integrity of the ceramic matrix and improve its surface wear resistance. It can also resist the erosion of chemical components in the smoke oil, avoid the release of harmful substances, improve the corrosion resistance of the ceramics, and extend the service life of the porous ceramics for electronic cigarettes. In addition, the lipophilicity of the ceramic surface treated with the silane coupling agent is improved, and it has better smoke oil adsorption and release performance, thereby improving the user experience.

[0068] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a porous ceramic material for an electronic cigarette, characterized in that: The method comprises the following preparation steps: (1) heating and dissolving the binder, then adding ceramic powder, pore-forming agent, sintering aid and modifier, mixing evenly, and kneading to obtain a kneaded material, wherein the pore-forming agent is cotton fiber loaded with nano-calcium carbonate; (2) placing the mixed material on a tape casting machine to form a porous ceramic green body; (3) performing debinding, degreasing and sintering treatments on the porous ceramic green body to obtain a porous ceramic matrix; (4) placing the porous ceramic substrate in a KH570 silane coupling agent solution, stirring the reaction for 30 to 60 minutes, filtering out the solid, washing it with ethanol for 2 to 3 times, and washing it with deionized water for 2 to 3 times to obtain a porous ceramic material for electronic cigarettes.

2. The method for preparing a porous ceramic material for electronic cigarette according to claim 1, characterized in that: The porous ceramic material for electronic cigarettes includes the following components in parts by mass: 40 to 75 parts of ceramic powder, 10 to 35 parts of pore formers, 5 to 30 parts of sintering aids, 0.01 to 3 parts of modifiers and 5 to 25 parts of binders.

3. The method for preparing a porous ceramic material for electronic cigarette according to claim 2, characterized in that: The ceramic powder includes one or more of diatomaceous earth, cordierite, alumina, zirconium oxide, silicon carbide, silicon nitride and quartz sand.

4. The method for preparing a porous ceramic material for electronic cigarette according to claim 3, characterized in that: The sintering aid includes one or more of glass powder, metal oxide, alkali metal oxide and transition metal oxide. The modifier is one or more of oleic acid, stearic acid and polyamide wax; The binder is one or more of paraffin, polyethylene, polypropylene, epoxy resin, phenolic resin and polystyrene.

5. The method for preparing a porous ceramic material for electronic cigarette according to claim 4, characterized in that: The particle size of the ceramic powder is 20-30 μm, the length of the cotton fiber is 100-180 μm, and the wire diameter is 5-20 μm.

6. The method for preparing a porous ceramic material for electronic cigarette according to claim 1, characterized in that: In the step (1), the dissolution temperature of the adhesive is 200-250° C., the mixing is performed by vacuum stirring, the vacuum degree is 300-600 Pa, and the stirring is performed at 600-1200 r / min for 30-45 minutes.

7. The method for preparing a porous ceramic material for electronic cigarette according to claim 1, characterized in that: The internal kneading in step (1) is performed by mixing in an internal mixer at a temperature of 60 to 65° C. for 5 to 8 hours.

8. The method for preparing a porous ceramic material for electronic cigarette according to claim 1, characterized in that: In the step (2), the height of the scraper during the casting process is 1.5 to 4.0 mm, the speed of the casting machine is 1.0 to 3.5 cm / s, and the thickness of the porous ceramic green body is 400 to 700 μm.

9. The method for preparing a porous ceramic material for an electronic cigarette according to claim 1, characterized in that: In the step (3), the debinding is performed by heating the material to 200°C at a rate of 0.2-1°C / min, then heating the material to 400°C at a rate of 0.5-2°C / min, and keeping the temperature for 1 hour. The debinding sintering is performed at a temperature of 500-1500°C for a period of 1-3 hours.

10. The method for preparing a porous ceramic material for electronic cigarette according to claim 1, characterized in that: The KH570 silane coupling agent solution in step (4) is prepared by mixing the KH570 silane coupling agent solution and ethanol in a volume ratio of 0.004 to 0.010:1, and the liquid-to-solid ratio of the KH570 silane coupling agent solution to the porous ceramic matrix is ​​20 to 30 mL / g.