A porous ceramic material for an electronic cigarette and a method of manufacturing the same

Abstract

The application discloses a kind of porous ceramic materials for electronic cigarette and preparation method thereof, it is related to porous ceramic material field.The application uses cotton fiber loaded with nano calcium carbonate as pore-forming agent, after high-temperature sintering, cotton fiber will be carbonized to form pore at high temperature, calcium carbonate will further decompose to form micron-sized spherical pore on the pore, form the multi-level structure of "big hole oil guide+small hole oil lock", simultaneously, carbon skeleton can be left after carbonization of cotton fiber, can play the role of support and enhancement in porous ceramic material, reduce the risk of fracture;It is placed in KH570 silane coupling agent solution, form a layer of film on the surface of calcium oxide and ceramic, improve the wear resistance of its surface, also can resist the erosion of chemical components in tobacco tar, prolong the service life of porous ceramic for electronic cigarette, the lipophilicity of ceramic surface after processing is improved, has better tobacco tar adsorption and release performance.The porous ceramic material for electronic cigarette prepared by the application improves the strength and oil guide performance of porous ceramic material.

Description

TECHNICAL FIELD

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

[0002] Porous ceramics have shown great application potential in many fields, including but not limited to filters, catalyst carriers, energy-saving insulation materials, adsorbent materials, and sound-absorbing materials, due to their excellent high-temperature and high-pressure resistance, as well as excellent acid and alkali resistance and organic medium corrosion resistance. The preparation process is diverse, covering various mature technical paths such as pore-forming agent addition, foaming, sol-gel, and solid-phase sintering, which lays a solid foundation for large-scale production of porous ceramics.

[0003] With the progress of society and the improvement of public health awareness, consumers have increasingly high requirements for smoking safety. Given the addictive nature of traditional cigarettes and the difficulty of quitting smoking, electronic cigarettes, as a new alternative, have gradually become the mainstream choice in the market. In the core components of electronic cigarettes, the atomizer plays a key role as a heating element, and the porous ceramic carrier material used for adsorbing tobacco oil is particularly important. Such inorganic non-metallic porous ceramic materials not only have excellent adsorption performance, but also have the characteristics of being non-toxic, harmless, safe and reliable, non-flammable, and good chemical stability. 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 the above, the present application is proposed. SUMMARY

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

[0006] To solve the above technical problems, the present application provides the following technical scheme: a preparation method of a porous ceramic material for electronic cigarettes, comprising the following preparation steps:

[0007] (1) Dissolve the binder by heating, then add ceramic powder, pore-forming agent, sintering aid, and modifier, mix uniformly, and densify to obtain a densified material, wherein the pore-forming agent is cotton fiber loaded with nano calcium carbonate;

[0008] (2) Place the densified material on a casting machine to form a porous ceramic green body;

[0009] (3) Perform debinding and sintering treatment on the porous ceramic green body to obtain a porous ceramic matrix;

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

[0011] Further, the porous ceramic material for electronic cigarettes comprises the following components in parts by mass: 40-75 parts of ceramic powder, 10-35 parts of pore-forming agent, 5-30 parts of sintering aid, 0.01-3 parts of modifier, and 5-25 parts of binder.

[0012] Further, the ceramic powder comprises one or more of diatomite, cordierite, alumina, zirconia, silicon carbide, silicon nitride, and quartz sand.

[0013] Further, the sintering aid comprises 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 wax, polyethylene, polypropylene, epoxy resin, phenolic resin, and polystyrene.

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

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

[0018] Further, in step (1), the mixing is performed in a mixing machine at a temperature of 60-65 °C for 5-8 hours.

[0019] Further, in step (2), the height of the doctor blade is 1.5-4.0 mm, the speed of the casting machine is 1.0-3.5 cm / s, and the thickness of the porous ceramic green body is 400-700 μm.

[0020] Further, in step (3), the degreasing is performed by increasing the temperature to 200 °C at a rate of 0.2-1 °C / min, and then increasing the temperature to 400 °C at a rate of 0.5-2 °C / min, and holding for 1 h, and the temperature for debinding and sintering is 500-1500 °C for 1-3 h.

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

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The present application first arranges the calcium carbonate-loaded cotton fiber pore-forming agent in the ceramic base material, and then hot-presses and forms a porous ceramic material for electronic cigarettes, thereby improving the strength and oil guiding performance of the porous ceramic material.

[0024] First, calcium carbonate is deposited in situ on the cotton fibers as a pore-forming agent, and then the cotton fibers are arranged in the ceramic base material by a flow casting method, and a porous ceramic material for electronic cigarettes is prepared by sintering; after high-temperature sintering, the cotton fibers are carbonized at high temperature to form pores, and the calcium carbonate is further decomposed on the pores to form micron-sized spherical pores, thereby increasing the specific surface area and oil storage capacity, forming a multi-level structure of "large pore oil guiding + small pore oil locking", improving the oil guiding efficiency and leakage prevention performance, and at the same time, the carbon skeleton is left after the carbonization of the cotton fibers, the presence of the carbon skeleton can reduce the sintering shrinkage of the ceramic, maintain the porous structure and performance stability 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, allowing it to better disperse stress and reduce the risk of fracture when subjected to external force.

[0025] Secondly, the calcium carbonate is left in the ceramic after high-temperature decomposition, and at the same time, the calcium oxide is exposed to the outside, the porous ceramic matrix is placed in the KH570 silane coupling agent solution, a layer of film is formed on the surface of the calcium oxide and the ceramic, fixing the calcium oxide particles and other ceramic powders, and 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 wear resistance, and can also resist the corrosion of chemical components in the tobacco tar, avoid the release of harmful substances, improve the corrosion resistance of the ceramic, and prolong the service life of the porous ceramic for electronic cigarettes, and the oil-wet property of the ceramic surface treated by the silane coupling agent is improved, having better tobacco tar adsorption and release performance, and improving the user experience. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In order to more clearly illustrate the method provided by the present application, the following examples are used to illustrate the method in detail. In the following examples, the test methods for each index of the porous ceramic material for electronic cigarettes prepared are as follows.

[0028] Bending strength: the same mass of the porous ceramic material for electronic cigarettes prepared in the examples and the comparative examples is determined for bending strength according to GB / T 1965-1996 "Porous Ceramics - Determination of Bending Strength - Test Method".

[0029] Oil guiding speed: the same mass of the porous ceramic material for electronic cigarettes prepared in the examples and the comparative examples is selected for oil guiding speed. A drop of oil is dropped on the surface of the porous ceramic material for electronic cigarettes using a pipette. The oil is a mixture of propylene glycol and glycerol in a volume ratio of 1:1. The weight of the porous ceramic material for electronic cigarettes before and after absorbing the oil (the difference between the weights before and after is the amount of oil absorbed by the porous ceramic material for electronic cigarettes) and the time required for the drop of oil to be completely absorbed are recorded. The amount of oil absorbed per unit time is the oil guiding speed.

[0030] Service life: the same mass of the porous ceramic material for electronic cigarettes prepared in the examples and the comparative examples is used for service life (hours). The service life is determined by continuously heating the porous ceramic material for electronic cigarettes under the conditions of an oil absorption rate greater than 50% and full power until the phenomenon of a gummy core occurs. The heating time is recorded. Example 1

[0031] A method for preparing a porous ceramic material for electronic cigarettes includes the following preparation steps:

[0032] (1) Cotton fibers with a length of 120 μm and a line diameter of 10 μm are placed in a calcium hydroxide solution with a concentration of 1.5 g / L. After soaking for 30 min, the cotton fibers are dipped and rolled twice at a pressure of 0.3 MPa, and the wet pick-up rate of the cotton fibers is 80%. The impregnated cotton fibers are placed in a container filled with carbon dioxide, and carbon dioxide is continuously introduced at a flow rate of 300 mL / min for 30 min. The cotton fibers are dried in a constant temperature drying oven at 60°C, washed twice with deionized water, and then dried in a constant temperature drying oven at 60°C to obtain cotton fibers loaded with nano calcium carbonate;

[0033] (2) The following components are taken according to mass parts: 30 parts of diatomite, 30 parts of quartz sand, 15 parts of cotton fibers loaded with nano calcium carbonate, 15 parts of glass powder, 0.5 parts of oleic acid, and 15 parts of paraffin wax. The particle sizes of the diatomite and the quartz sand are both 20 μm.

[0034] (3) According to the formula, the paraffin wax is heated and dissolved at 200°C. Then, the ceramic powder, the cotton fibers loaded with nano calcium carbonate, the glass powder, and the oleic acid are added. The mixture is stirred at a vacuum degree of 300 Pa and a stirring speed of 600 r / min for 30 min. The mixture is then mixed in a banbury mixer at a temperature of 60°C for 5 hours to obtain a banbury mixture.

[0035] (4) The compound is placed on the casting machine to form, the height of the scraper is 2.0mm, the speed of the casting machine is 1.5cm / s, and the porous ceramic green body with a thickness of 400μm is formed;

[0036] (5) The porous ceramic green body is heated to 200℃ at 0.5℃ / min, then heated to 400℃ at 1℃ / min, and the glue is removed for 1h, and then sintered at 1000℃ for 2h to obtain a porous ceramic matrix;

[0037] (6) The silane coupling agent solution is mixed with ethanol at a volume ratio of 0.004:1 to obtain a silane coupling agent solution, and the porous ceramic matrix is placed in the KH570 silane coupling agent solution, the liquid-solid ratio is 20mL / g, and the solid is filtered after stirring for 30 minutes, washed with ethanol for 3 times, and deionized water for 3 times, to obtain a porous ceramic material for electronic cigarettes. Example 2

[0038] A method for preparing a porous ceramic material for electronic cigarettes, comprising the following preparation steps:

[0039] (1) The length of the cotton fiber is 150μm, the line diameter is 15μm, and the cotton fiber is placed in a 1.5g / L calcium hydroxide solution, soaked for 30min, and then dipped and rolled twice, the rolling pressure is 0.3MPa, the liquid rate of the cotton fiber is 80%, the impregnated cotton fiber is placed in a container filled with carbon dioxide, and the flow rate of the continuously introduced carbon dioxide is 300mL / min, the reaction time is 35min, and the deionized water is washed 3 times, and then placed in a constant temperature drying oven at 60℃ to dry to obtain a cotton fiber loaded with nano calcium carbonate;

[0040] (2) The following components are taken according to the mass fraction: 30 parts of diatomite, 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, and the particle size of diatomite and silicon carbide is 25μm;

[0041] (3) According to the formula, the paraffin is heated and dissolved at 230℃, then the ceramic powder, the cotton fiber loaded with nano calcium carbonate, the glass powder and the oleic acid are added, and the vacuum degree is 500Pa, the stirring speed is 800r / min, and the stirring time is 40min, then the compound is placed in a mixing machine at a temperature of 65℃ for 6 hours to obtain a compound;

[0042] (4) The compound is placed on the casting machine to form, the height of the scraper is 2.5mm, the speed of the casting machine is 2.0cm / s, and the porous ceramic green body with a thickness of 600μm is formed;

[0043] (5) the porous ceramic green body is heated to 200℃ at a rate of 0.5℃ / min, then heated to 400℃ at a rate of 1.5℃ / min, and kept for 1h to perform the glue removal treatment, and then sintered at 1200℃ for 2h to obtain the porous ceramic substrate;

[0044] (6) a silane coupling agent solution is prepared by mixing KH570 silane coupling agent solution and ethanol at a volume ratio of 0.007:1, the porous ceramic substrate is placed in the KH570 silane coupling agent solution, the liquid-solid ratio is 25mL / g, and after stirring for 45min, the solid is filtered, washed with ethanol for 3 times, and washed with deionized water for 3 times to obtain the porous ceramic material for electronic cigarettes. Example 3

[0045] A method for preparing a porous ceramic material for electronic cigarettes comprises the following preparation steps:

[0046] (1) cotton fibers with a length of 180μm and a line diameter of 20μm are placed in a calcium hydroxide solution of 1.5g / L, and after soaking for 30min, they are dipped and rolled twice, the rolling pressure is 0.3MPa, and the liquid retention rate of the cotton fibers is 80%, the impregnated cotton fibers are placed in a container filled with carbon dioxide, and carbon dioxide is continuously introduced at a flow rate of 300mL / min, the reaction is carried out for 40min, and then the cotton fibers are dried in a constant temperature drying oven at 60℃, washed with deionized water for 3 times, and then dried in a constant temperature drying oven at 60℃ to obtain the cotton fibers loaded with nano calcium carbonate;

[0047] (2) the following components are taken according to the mass fraction: 30 parts of diatomite, 35 parts of cordierite, 25 parts of the cotton fibers loaded with nano calcium carbonate, 25 parts of glass powder, 1.5 parts of oleic acid, and 20 parts of paraffin wax, and the particle size of the diatomite and the cordierite is 20-30μm;

[0048] (3) according to the formula, the paraffin wax is dissolved by heating at 250℃, and then the ceramic powder, the cotton fibers loaded with nano calcium carbonate, the glass powder, and the oleic acid are added, and the mixture is stirred at a vacuum degree of 600Pa and a stirring speed of 1200r / min for 45min, and then the mixture is placed in a mixing machine for mixing at a temperature of 65℃ for 8h to obtain a mixing material;

[0049] (4) the mixing material is placed on a casting machine to form a porous ceramic green body, the height of the scraper is 4.0mm, and the speed of the casting machine is 3.5cm / s, and the thickness of the porous ceramic green body is 700μm;

[0050] (5) the porous ceramic green body is heated to 200℃ at a rate of 1℃ / min, then heated to 400℃ at a rate of 2℃ / min, and kept for 1h to perform the glue removal treatment, and then sintered at 1500℃ for 3h to obtain the porous ceramic substrate;

[0051] (6) mixing the KH570 silane coupling agent solution with ethanol in a volume ratio of 0.010:1 to obtain a silane coupling agent solution, placing the porous ceramic substrate in the KH570 silane coupling agent solution, stirring for 60 minutes at a liquid-to-solid ratio of 30 mL / g, filtering to obtain the solid, washing with ethanol for 3 times, and washing with deionized water for 3 times to obtain the porous ceramic material for electronic cigarettes.

[0052] Comparative Example 1

[0053] Comparative Example 1 differs from Example 2 in that step (1) is omitted, and step (2) is changed to: taking the following components by mass parts: 30 parts of diatomite, 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 wax, the particle size of diatomite and silicon carbide being 25 μm; step (3) is changed to: according to the formula, dissolving the paraffin wax at 230°C, then adding the ceramic powder, cotton fiber, glass powder, and oleic acid, stirring at a vacuum degree of 500 Pa and 800 r / min for 40 min, and placing in a banbury mixer for mixing at a temperature of 65°C for 6 hours to obtain a banbury compound; and the remaining steps are the same as in Example 2.

[0054] Comparative Example 2

[0055] Comparative Example 2 differs from Example 2 in that step (1) is omitted, and step (2) is changed to: taking the following components by mass parts: 30 parts of diatomite, 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 wax, the particle size of diatomite and silicon carbide being 25 μm; step (3) is changed to: according to the formula, dissolving the paraffin wax at 230°C, then adding the ceramic powder, calcium carbonate, glass powder, and oleic acid, stirring at a vacuum degree of 500 Pa and 800 r / min for 40 min, and placing in a banbury mixer for mixing at a temperature of 65°C for 6 hours to obtain a banbury compound; and the remaining steps are the same as in Example 2.

[0056] Comparative Example 3

[0057] Comparative Example 3 differs from Example 2 in that step (4) is omitted, and step (4) is changed to: placing the banbury compound in a hot-pressing machine for hot-pressing molding at a temperature of 80°C and a pressure of 0.5 MPa to obtain a porous ceramic green body; and the remaining steps are the same as in Example 2.

[0058] Comparative Example 4

[0059] 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 subjected to degassing treatment by increasing the temperature to 200°C at a rate of 0.5°C / min, and then increasing the temperature to 400°C at a rate of 1.5°C / min, and holding for 1 h, and then sintering at 1200°C for 2 h to obtain a porous ceramic substrate, and the porous ceramic substrate is washed with ethanol for 3 times and deionized water for 3 times to obtain the porous ceramic material for electronic cigarettes; and the remaining steps are the same as those in Example 2.

[0060] Effect Example

[0061] The performance analysis results of the porous ceramic material for electronic cigarettes obtained by using Examples 1 to 3 and Comparative Examples 1 to 4 of the present application are shown in Table 1 below.

[0062] Table 1

[0063]

[0064] From the comparison of the experimental data of Example 2 and Comparative Examples 1 and 2, it can be found that after high-temperature sintering, the cotton fibers are carbonized at high temperature to form pores, and calcium carbonate is further decomposed in the pores to form micron-sized spherical pores, increasing the specific surface area and oil storage capacity, and forming a multi-level structure of "large pore oil guiding + small pore oil locking", improving the oil guiding efficiency and leakage prevention 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 stability 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, improving the overall structural stability of the ceramic, so that it can better disperse stress and reduce the risk of fracture when subjected to external force. From the comparison of the experimental data of Example 2 and Comparative Example 3, it can be found that the cotton fibers are arranged in a direction in the ceramic base material by the flow casting method, and the generated pores are orderly, which has a positive effect on the bending strength, guiding performance and service life of the porous ceramic. 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, pores are left in the ceramic, and calcium oxide is exposed outside, and the porous ceramic is placed in a KH570 silane coupling agent solution, forming a film on the surface of the calcium oxide and the ceramic, fixing the calcium oxide particles and other ceramic powders, so that the calcium oxide particles are not easy to fall off from the substrate when subjected to external friction or wear, which helps to maintain the integrity of the ceramic substrate and improve its wear resistance. It can also resist the corrosion of chemical components in the tobacco tar, avoid the release of harmful substances, improve the corrosion resistance of the ceramic, and prolong the service life of the porous ceramic for electronic cigarettes. In addition, the surface of the ceramic treated by the silane coupling agent has improved lipophilicity, better tobacco tar adsorption and release performance, and improved user experience.

[0065] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference herein to any prior art is to be taken as an admission that the present application is not entitled to antedate such prior art by virtue of prior application. Any reference to the term "comprising" is to be construed in accordance with the definition of that term provided in the preamble to Article 69 of the European Patent Convention. Any reference to the term "comprising" is to be construed in accordance with the definition of that term provided in the preamble to Article 69 of the European Patent Convention.

Claims

1. A method for producing a porous ceramic material for an electronic cigarette, characterized by, The preparation method comprises the following steps: (1) heating and dissolving the adhesive, then adding ceramic powder, pore-forming agent, sintering aid and modifier, mixing uniformly, and densifying to obtain a densified material, wherein the pore-forming agent is cotton fiber loaded with nano calcium carbonate; (2) placing the densified material on a casting machine to form a porous ceramic green body; (3) performing glue removal and debinding sintering treatment on the porous ceramic green body to obtain a porous ceramic matrix; (4) placing the porous ceramic matrix in a KH570 silane coupling agent solution, stirring for 30-60 minutes, filtering the solid, washing with ethanol for 2-3 times, and washing with deionized water for 2-3 times to obtain the porous ceramic material for electronic cigarettes.

2. The method for preparing a porous ceramic material for electronic cigarettes according to claim 1, characterized in that, The porous ceramic material for electronic cigarettes comprises the following components in parts by mass: 40-75 parts of ceramic powder, 10-35 parts of pore-forming agent, 5-30 parts of sintering aid, 0.01-3 parts of modifier, and 5-25 parts of adhesive.

3. The method of claim 2, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. The ceramic powder comprises one or more of diatomite, cordierite, alumina, zirconia, silicon carbide, silicon nitride and quartz sand.

4. The method of claim 3, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. The sintering aid comprises one or more of glass powder, alkali metal oxide and transition metal oxide; The modifier is one or more of oleic acid, stearic acid and polyamide wax; The adhesive is one or more of paraffin, polyethylene, polypropylene, epoxy resin, phenolic resin and polystyrene.

5. The method of claim 4, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: 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 of claim 1, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. In step (1), the adhesive is dissolved at a temperature of 200-250 °C, mixed by vacuum stirring at a vacuum degree of 300-600 Pa, and stirred at 600-1200 r / min for 30-45 min.

7. The method of claim 1, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. In step (1), the densifying is performed in a densifying machine at a temperature of 60-65 °C for 5-8 hours.

8. The method of claim 1, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. In step (2), the height of the doctor blade during casting is 1.5-4.0 mm, the speed of the casting machine is 1.0-3.5 cm / s, and the thickness of the porous ceramic green body is 400-700 μm.

9. The method of claim 1, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. In step (3), the glue removal is performed by increasing the temperature to 200 °C at a rate of 0.2-1 °C / min, and then increasing the temperature to 400 °C at a rate of 0.5-2 °C / min, and holding for 1 h, the debinding sintering temperature is 500-1500 °C, and the time is 1-3 h.

10. The method of claim 1, wherein the porous ceramic material for an electronic cigarette is prepared by the steps of: preparing a slurry by mixing a ceramic powder, a binder, and a solvent; and drying the slurry to form a green body. In step (4), the KH570 silane coupling agent solution is prepared by mixing KH570 silane coupling agent solution and ethanol at a volume ratio of 0.004-0.010:1, and the liquid-solid ratio of the KH570 silane coupling agent solution to the porous ceramic matrix is 20-30 mL / g.

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