CN113429217A

CN113429217A - Preparation method of porous ceramic matrix, atomizing core, atomizer and electronic cigarette

Info

Publication number: CN113429217A
Application number: CN202110662196.0A
Authority: CN
Inventors: 黄永俊; 屈雪平; 谢宝林; 钟家鸣
Original assignee: Shenzhen Harper Biotechnology Co ltd
Current assignee: Shenzhen Harper Biotechnology Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-09-24

Abstract

The application provides a preparation method of a porous ceramic matrix, an atomizing core, an atomizer and an electronic cigarette, wherein the atomizing core comprises the porous ceramic matrix and a heating layer; the porous ceramic matrix is a low-thermal conductivity silicate porous ceramic matrix, and the thermal conductivity coefficient of the porous ceramic matrix is less than 0.3W/(m.K); the heating layer is arranged on the surface of the porous ceramic matrix. Through the arrangement, the atomizing core has no peculiar smell in the atomizing process; and the porous ceramic matrix has a lower heat conductivity coefficient, heat is concentrated on the atomizing surface of the atomizing core as far as possible, the atomizing temperature of the tobacco juice is reached in a short time, the consistency of the taste in the smoking process is ensured, the reduction degree of the tobacco juice is better, the taste of smoke is favorably promoted, and the cruising time of the battery is prolonged.

Description

Preparation method of porous ceramic matrix, atomizing core, atomizer and electronic cigarette

Technical Field

The invention relates to the technical field of atomizers, in particular to a preparation method of a porous ceramic matrix, an atomizing core, an atomizer and an electronic cigarette.

Background

The electronic cigarette is used as an electronic product for quitting smoking or replacing cigarettes. The electronic cigarette generates smoke through heating and atomizing the cigarette liquid, and the generated smoke has the same taste and feeling as a cigarette. And when the cigarette liquid is heated and atomized, harmful ingredients such as tar and suspended particles in the cigarette can not be generated.

The atomizing core in the electronic cigarette is a main part for storing and generating cigarette liquid, and the porous ceramic is widely applied to the atomizing core due to the excellent characteristics of high porosity, good oil storage property, uneasy generation of scorch, high reduction degree of aroma in the cigarette liquid and the like. Therefore, the atomizing core which occupies a relatively large market is a ceramic atomizing core.

The formulations of ceramic atomizing cores are generally diatomite systems, quartz sand systems and alumina systems. The ceramic atomization cores of different systems have different heat-conducting properties, but have the problems of inconsistent smoke mouthfeel and peculiar smell in the smoking process.

Disclosure of Invention

In view of this, the application provides a preparation method of a porous ceramic substrate, an atomizing core, an atomizer and an electronic cigarette, so as to solve the technical problems of inconsistent taste and peculiar smell of smoke in the smoking process in the prior art.

In order to solve the above technical problem, a first technical solution provided by the present application is: there is provided an atomizing core comprising: a porous ceramic matrix and a heating layer; the porous ceramic matrix is a low-thermal-conductivity silicate porous ceramic matrix, and the thermal conductivity of the porous ceramic matrix is less than 0.3W/(m.K); the heating layer is arranged on the surface of the porous ceramic matrix.

Wherein the porosity of the porous ceramic matrix is 45-70%.

The preparation raw materials of the porous ceramic matrix comprise solid powder and an organic solvent, wherein the solid powder comprises the low-thermal-conductivity silicate, a pore-forming agent, diatomite, an inorganic binder and a sintering aid, and the organic solvent comprises paraffin, plastics, a surface modifier and a plasticizer.

Wherein the low thermal conductivity silicate has a thermal conductivity of less than 0.6W/(m.K).

Wherein the low thermal conductivity silicate comprises silicon dioxide, magnesium oxide, aluminum oxide, ferric oxide and calcium oxide.

Wherein, the silicon dioxide accounts for 40 to 75 weight percent of the low heat-conducting silicate, the magnesium oxide accounts for 0.1 to 20 weight percent of the low heat-conducting silicate, the aluminum oxide accounts for 0.1 to 17 weight percent of the low heat-conducting silicate, the ferric oxide accounts for 0 to 24 weight percent of the low heat-conducting silicate, and the calcium oxide accounts for 0 to 16 weight percent of the low heat-conducting silicate.

Wherein the low-thermal-conductivity silicate accounts for 30-80 wt% of the solid powder, the pore-forming agent accounts for 10-40 wt% of the solid powder, the diatomite accounts for 0-40 wt% of the solid powder, the inorganic binder accounts for 0-20 wt% of the solid powder, and the sintering aid accounts for 0-15 wt% of the solid powder;

the paraffin accounts for 10-80 wt% of the organic solvent, the plastic accounts for 1-20 wt% of the organic solvent, the surface modifier accounts for 1-10 wt% of the organic solvent, and the plasticizer accounts for 0-10 wt% of the organic solvent.

Wherein the pore-forming agent is one or more of polyvinyl chloride microspheres, polymethyl methacrylate, flour, corn starch and carbon powder; the inorganic binder is one or more of sodium silicate, calcium silicate and silica micropowder; the sintering aid is one or more of zinc oxide, titanium dioxide, glass powder and lithium carbonate; the plastic is one or more of polypropylene, polyethylene, polystyrene and polyamide; the surface modifier is one or more of fatty acid, aluminate coupling agent, silane coupling agent and ethylene-propylene copolymer; the plasticizer is one or more of diethyl phthalate, di-n-butyl phthalate and dioctyl phthalate.

In order to solve the above technical problem, a second technical solution provided by the present application is: an atomizer is provided, which comprises a liquid storage cavity and an atomizing core; the liquid storage cavity is used for storing tobacco liquid; the atomization core is used for atomizing the tobacco juice; the atomizing core is any one of the atomizing cores.

In order to solve the above technical problem, a third technical solution provided by the present application is: provided is an electronic cigarette, including: an atomizer and a host; the atomizer is the atomizer; the host is used for controlling the atomizer to work.

In order to solve the above technical problem, a fourth technical solution provided by the present application is: provided is a method for preparing a porous ceramic matrix, including: obtaining solid powder, wherein the solid powder comprises low-heat-conductivity silicate, a pore-forming agent, diatomite, an inorganic binder and a sintering aid; obtaining an organic solvent, and adding the solid powder into the organic solvent to obtain a mixed material; wherein the organic solvent comprises paraffin, plastic, a surface modifier and a plasticizer; performing injection molding on the mixed material to obtain a prefabricated biscuit; performing glue removal on the prefabricated biscuit to obtain a pre-sintered blank; and sintering the pre-sintered blank to obtain the porous ceramic matrix.

Wherein, the solid powder acquisition specifically comprises:

weighing the low-thermal-conductivity silicate, the pore-forming agent, the diatomite, the inorganic binder and the sintering aid in proportion;

and uniformly stirring the low-thermal-conductivity silicate, the pore-forming agent, the diatomite, the inorganic binder, the sintering aid and the additive, and drying at the temperature of 80-150 ℃ for 1.5-3h to obtain the solid powder.

The step of obtaining the organic solvent and adding the solid powder into the organic solvent to obtain the mixed material specifically comprises the following steps:

weighing the organic solvent according to the proportion, and melting at 90-200 ℃;

and adding the solid powder into the organic solvent, and stirring for 3-8 h to obtain the mixed material.

Wherein the temperature of the rubber discharge is 500-1100 ℃;

in the temperature rise process of the prefabricated biscuit glue discharging, when the temperature is lower than 400 ℃, the temperature rise rate is 0.1-5 ℃/min; at the temperature of above 400 ℃, the heating rate is 1-10 ℃/min.

Wherein the sintering temperature is 800-1600 ℃; and in the temperature rise process of sintering the pre-sintered blank, the temperature rise rate is 2-15 ℃/min.

The beneficial effect of this application: different from the prior art, the atomization core in the application comprises a porous ceramic matrix and a heating layer; the porous ceramic matrix is a low-thermal conductivity silicate porous ceramic matrix, and the thermal conductivity coefficient of the porous ceramic matrix is less than 0.3W/(m.K); the heating layer is arranged on the surface of the porous ceramic matrix. Through the arrangement, the atomizing core has no peculiar smell in the atomizing process; and the porous ceramic matrix has a lower heat conductivity coefficient, heat is concentrated on the atomizing surface of the atomizing core as far as possible, the atomizing temperature of the tobacco juice is reached in a short time, the consistency of the taste in the smoking process is ensured, the reduction degree of the tobacco juice is better, the taste of smoke is favorably promoted, and the cruising time of the battery is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Figure 1 is a schematic structural view of an electronic cigarette provided herein;

FIG. 2 is a schematic diagram of the construction of an atomizer provided herein;

FIG. 3 is a schematic structural view of an atomizing core provided herein;

fig. 4 is a schematic flow chart of a method of preparing a porous ceramic matrix provided herein.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic cigarette provided in the present application.

Electronic cigarettes may be used for atomization of liquid substrates. The electronic cigarette comprises an atomizer 1 and a host machine 2 which are connected with each other. The atomizer 1 is used for storing liquid matrix and atomizing the liquid matrix to form smoke which can be inhaled by a user, and the liquid matrix can be liquid medicine, smoke liquid and the like; the nebulizer 1 is particularly useful in different fields, such as medical treatment, electronic cigarettes, etc. The main machine 2 is used for controlling the atomizer 1 to work. Specifically, the host 2 includes a battery (not shown), an airflow sensor (not shown), a controller (not shown), and the like; the battery is used to power the atomiser 1 so that the atomiser 1 can atomise a liquid substrate to form an aerosol; the airflow sensor is used for detecting airflow changes in the electronic cigarette, and the controller starts the electronic cigarette according to the airflow changes detected by the airflow sensor. The atomizer 1 and the host machine 2 can be integrally arranged or detachably connected and designed according to specific requirements. In this embodiment, the electronic cigarette is used in atomized tobacco liquid, and the tobacco liquid includes nicotine.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an atomizer provided in the present application.

The atomizer 1 comprises a liquid storage chamber 11 and an atomizing core 12. The liquid storage cavity 11 is used for storing liquid matrix, and in the embodiment, the liquid storage cavity 11 is used for storing tobacco juice. The atomizing core 12 is used for atomizing the tobacco liquid in the liquid storage cavity 11 for the user to suck.

Referring to fig. 3, fig. 3 is a schematic structural view of an atomizing core provided in the present application.

The atomizing core 12 includes a porous ceramic base 121 and a heat generating layer 122, the heat generating layer 122 is disposed on the surface of the porous ceramic base 121, and the surface of the porous ceramic base 121 on which the heat generating layer 122 is disposed is an atomizing surface. The porous ceramic substrate 121 contacts the smoke liquid from the liquid storage cavity 11, and guides the smoke liquid to the heat generating layer 122 by using capillary force, and the heat generating layer 122 heats and atomizes the smoke liquid to form smoke. That is, the porous ceramic substrate 121 is used for storing and guiding the smoke liquid, and the heat generating layer 122 is used for heating the atomized smoke liquid.

The porous ceramic matrix 121 is a low thermal conductivity silicate porous ceramic matrix having a thermal conductivity of less than 0.3W/(m · K). The atomization core 12 has no peculiar smell in the atomization process by using the low-heat-conduction silicate porous ceramic matrix with the heat conductivity coefficient of less than 0.3W/(m.K); and the porous ceramic matrix 121 has a lower heat conductivity coefficient, heat is concentrated on the atomizing surface of the atomizing core 12 as much as possible, the atomizing temperature of the tobacco juice is reached in a short time, the consistency of the taste in the smoking process is ensured, the reduction degree of the tobacco juice is better, the reduction degree of the tobacco juice is close to an ideal value, the taste of the smoke is favorably improved, and meanwhile, the cruising time of the battery in the host machine 2 is prolonged.

Specifically, the porous ceramic base 121 includes a first surface on which the heat generating layer 122 is disposed and a second surface opposite to the first surface; that is, the first surface is an atomizing surface. When the thermal conductivity of the porous ceramic substrate 121 is greater than 0.3W/(m · K), the heat generated by the heat-generating layer 122 is more easily conducted to the second surface of the porous ceramic substrate 121, so that the heat loss of the heat-generating layer 122 is increased, the heating efficiency of the heat-generating layer 122 is reduced, the smoke containing nicotine is not sucked when a user sucks the first mouth, and the consistency of the taste before and after suction cannot be ensured; and the more heat loss of the heating layer 122, the more electric energy is needed for atomizing the same amount of smoke liquid, which is not beneficial to the battery endurance. When the heat conductivity coefficient of the porous ceramic substrate 121 is less than 0.3W/(m · K), the heat generated by the heat-generating layer 122 is relatively less conducted to the second surface of the porous ceramic substrate 121, so that the user can be ensured to suck the smoke containing nicotine when sucking the first mouth, the consistency of the mouth feel before and after the suction is ensured, and the reduction degree of the smoke liquid is better. The thermal conductivity of the porous ceramic substrate 121 is preferably 0.05W/(mK) or more and less than 0.3W/(mK).

The porosity of the porous ceramic matrix 121 is 45% to 70%. The porosity of the porous ceramic substrate 121 is lower than 45%, which affects the amount of liquid to be transported to the heat generating layer 122, and may cause problems such as dry burning and scorched smell. The porosity of the porous ceramic base 121 is higher than 70%, which affects the strength of the porous ceramic base 121 and is not favorable for improving the service life of the atomizing core 12.

The heat conductivity coefficient of the porous ceramic matrix 121 is less than 0.3W/(m.K), when the porosity of the porous ceramic matrix 121 is 45% -70%, the lower the heat conductivity coefficient is, the larger the porosity is, and at the moment, the smoke liquid flows faster when the porosity is larger, and because the heat conductivity coefficient is low, the heat of the heating layer 122 is mainly used for atomizing the smoke liquid, and at the moment, the atomization efficiency is higher.

In a specific embodiment, the raw materials for preparing the porous ceramic matrix 121 include solid powder and an organic solvent, the solid powder includes low thermal conductivity silicate, pore-forming agent, diatomite, inorganic binder, sintering aid and additive, and the organic solvent includes paraffin, plastic, surface modifier and plasticizer.

Wherein, the low heat-conducting silicate accounts for 30 to 80 percent of the weight of the solid powder, the pore-forming agent accounts for 10 to 40 percent of the weight of the solid powder, the diatomite accounts for 0 to 40 percent of the weight of the solid powder, the inorganic binder accounts for 0 to 20 percent of the weight of the solid powder, and the sintering aid accounts for 0 to 15 percent of the weight of the solid powder. The paraffin accounts for 10-80 wt% of the organic solvent, the plastic accounts for 1-20 wt% of the organic solvent, the surface modifier accounts for 1-10 wt% of the organic solvent, and the plasticizer accounts for 0-10 wt% of the organic solvent.

Specifically, the low thermal conductive silicate in the preparation raw material of the porous ceramic substrate 121 includes silica, magnesia, alumina, ferric oxide, and calcium oxide. The thermal conductivity of the low thermal conductivity silicate is less than 0.6W/(m.K); preferably, the thermal conductivity of the low thermal conductivity silicate is 0.2W/(mK) or more and less than 0.6W/(mK). The alumina and the silica can generate mullite in the process of sintering to form the porous ceramic matrix 121, which is beneficial to ensuring that the porous ceramic matrix 121 has higher porosity and higher strength, and can better satisfy the user experience. In one embodiment, the low thermal conductivity silicate comprises 40 wt% to 75 wt% of silica, 0.1 wt% to 20 wt% of magnesia, 0.1 wt% to 17 wt% of alumina, 0 wt% to 24 wt% of iron sesquioxide, and 0 wt% to 16 wt% of calcium oxide.

The pore-forming agent is one or more of polyvinyl chloride microspheres, polymethyl methacrylate, flour, corn starch and carbon powder; the inorganic binder is one or more of sodium silicate, calcium silicate and silicon micropowder; the sintering aid is one or more of zinc oxide, titanium dioxide, glass powder and lithium carbonate; the additive is silicon carbide; the plastic is one or more of polypropylene, polyethylene, polystyrene and polyamide; the surface modifier is one or more of fatty acid, aluminate coupling agent, silane coupling agent and ethylene-propylene copolymer; the plasticizer is one or more of diethyl phthalate, di-n-butyl phthalate and dioctyl phthalate.

It can be understood that, since the low thermal conductivity silicate in the raw material for preparing the porous ceramic matrix 121 may undergo a series of complex physicochemical reactions through high temperature sintering, a new phase may be generated, and the generated new phase also belongs to the category of the low thermal conductivity silicate, and therefore, the composition of the low thermal conductivity silicate in the raw material for preparing the porous ceramic matrix 121 is different from that of the low thermal conductivity silicate in the porous ceramic matrix of the low thermal conductivity silicate obtained after sintering. Since the low thermal conductivity silicate (with a thermal conductivity of 0.2W/(m.K) -0.6W/(m.K)) in the raw materials for preparing the porous ceramic matrix 121 has a chemical reaction or a physical reaction during the sintering process, the low thermal conductivity silicate porous ceramic matrix is obtained with a relatively low thermal conductivity (with a thermal conductivity of 0.05W/(m.K) -0.3W/(m.K)).

Referring to fig. 4, fig. 4 is a schematic flow chart illustrating a method for preparing a porous ceramic substrate according to the present application.

A method of preparing the porous ceramic substrate 121, comprising:

s1: and obtaining solid powder, wherein the solid powder comprises low-heat-conductivity silicate, a pore-forming agent, diatomite, an inorganic binder and a sintering aid.

Specifically, the low thermal conductive silicate includes silicon dioxide, magnesium oxide, aluminum oxide, ferric oxide, and calcium oxide. The weight percentage of silicon dioxide in the low heat-conducting silicate is 40-75%, the weight percentage of magnesium oxide in the low heat-conducting silicate is 0.1-20%, the weight percentage of aluminum oxide in the low heat-conducting silicate is 0.1-17%, the weight percentage of ferric oxide in the low heat-conducting silicate is 0-24%, and the weight percentage of calcium oxide in the low heat-conducting silicate is 0-16%.

The pore-forming agent is one or more of polyvinyl chloride microspheres, polymethyl methacrylate, flour, corn starch and carbon powder; the inorganic binder is one or more of sodium silicate, calcium silicate and silicon micropowder; the sintering aid is one or more of zinc oxide, titanium dioxide, glass powder and lithium carbonate; the additive is silicon carbide.

The low heat-conducting silicate accounts for 30-80 wt% of the solid powder, the pore-forming agent accounts for 10-40 wt% of the solid powder, the diatomite accounts for 0-40 wt% of the solid powder, the inorganic binder accounts for 0-20 wt% of the solid powder, and the sintering aid accounts for 0-15 wt% of the solid powder.

The method for obtaining the solid powder specifically comprises the following steps:

s11: weighing low-heat-conductivity silicate, pore-forming agent, diatomite, inorganic binder, sintering aid and additive according to the proportion.

S12: uniformly stirring the low-heat-conductivity silicate, the pore-forming agent, the diatomite, the inorganic binder and the sintering aid, and drying at the temperature of 80-150 ℃ for 1.5-3h to obtain solid powder.

Specifically, a mechanical stirring mode can be selected for uniform stirring; an oven may be selected for drying.

S2: obtaining an organic solvent, and adding solid powder into the organic solvent to obtain a mixed material; wherein the organic solvent comprises paraffin, plastic, a surface modifier and a plasticizer.

Specifically, the paraffin accounts for 10-80 wt% of the organic solvent, the plastic accounts for 1-20 wt% of the organic solvent, the surface modifier accounts for 1-10 wt% of the organic solvent, and the plasticizer accounts for 0-10 wt% of the organic solvent.

The plastic is one or more of polypropylene, polyethylene, polystyrene and polyamide; the surface modifier is one or more of fatty acid, aluminate coupling agent, silane coupling agent and ethylene-propylene copolymer; the plasticizer is one or more of diethyl phthalate, di-n-butyl phthalate and dioctyl phthalate.

The preparation method comprises the following steps of (1) obtaining an organic solvent, and adding solid powder into the organic solvent to obtain a mixed material, wherein the mixed material specifically comprises the following steps:

s21: weighing the organic solvent according to the proportion, and melting at 90-200 ℃.

Specifically, the organic solvent weighed according to the proportion is melted by an internal mixer at the temperature of 90-200 ℃.

S22: adding the solid powder into the organic solvent, and stirring for 3-8 h to obtain the mixed material.

Specifically, adding solid powder into an internal mixer, mixing and stirring the solid powder with a melted organic solvent for 3-8 hours to obtain a mixed material.

S3: and performing injection molding on the mixed material to obtain a prefabricated biscuit.

S4: and (4) carrying out glue discharging on the prefabricated biscuit to obtain a pre-sintered blank.

Specifically, the temperature for discharging the rubber from the prefabricated biscuit is 500-1100 ℃. In the temperature rise process of the prefabricated biscuit glue discharging, when the temperature is below 400 ℃, the temperature rise rate is 0.1-5 ℃/min; when the temperature is above 400 ℃, the heating rate is 1-10 ℃/min.

S5: and sintering the pre-sintered blank to obtain the atomizing core.

Specifically, the temperature for sintering the pre-sintered blank body is 800-1600 ℃. And in the temperature rise process of sintering the pre-sintered blank, the temperature rise rate is 2-15 ℃/min.

In the preparation process of the porous ceramic matrix 121, the solid powder and the organic solvent are uniformly mixed and stirred, the porosity of the porous ceramic matrix 121 is stable in the forming process, a finished product is not easy to crack or fall off, the manufacturing process is simple, and the production efficiency is improved.

The atomization core 12 is obtained by silk-screening heating slurry with a specific pattern on the surface of the porous ceramic substrate 121, wherein the heating slurry is a preparation raw material of the heating layer 122, drying and then performing vacuum integrated sintering. The atomizing core 12 made by the preparation method provided by the application does not crack liquid when atomizing the tobacco juice, does not generate burnt flavor, has stable atomizing effect, enables the fragrance of the tobacco juice to be accurately expressed in the smoke formed by atomization, and improves the experience of users on the taste of the smoke.

The present application has performed experiments on the influence of the thermal conductivity and porosity of the porous ceramic base 121 on the reduction of the mouth feel, and the results are shown in table 1, where table 1 is the influence of the thermal conductivity and porosity of the porous ceramic base 121 on the reduction of the mouth feel.

TABLE 1 influence of thermal conductivity and porosity of porous ceramic matrix on reduction of mouthfeel

Test of	Porosity of the material	Material	Thermal conductivity W/(m.K)	Evaluation of taste
					Sample
1	50％	Alumina, silicon carbide	2.2	3
					Sample 2	50％	Alumina oxide	1.5	3.8
Sample 3	45％	Silicon oxide	0.8	4
					Sample No. 4	50％	Alumina, silica	0.8	4.3
Sample No. 5	50％	Alumina, silica	1.2	4
					Sample No. 6	55％	Alumina, silica	1.2	4.2
Sample 7	55％	Alumina, silica	0.5	4.5
					Sample 8	60％	Diatomaceous earth and alumina	0.5	4.6
Sample 9	60％	Diatomite	0.45	4.7

The "material" in table 1 is the main material in the corresponding sample, and the "taste evaluation" is full of 5, and closer to 5, the closer to the ideal taste.

As can be seen from table 1, the lower the thermal conductivity is, the better the mouthfeel reduction is, under the same porosity conditions. The lower the thermal conductivity of the porous ceramic base 121, the lower the thermal conductivity of the porous ceramic base 121 itself, and the slower the heat dissipation; that is to say, the lower the heat transfer efficiency between the atomization surface (the first surface of the porous ceramic substrate 121) and the liquid absorption surface (the second surface of the porous ceramic substrate 121), the concentrated all heat is used for atomizing the tobacco liquid, the higher the atomization efficiency is, so that the time required for the tobacco liquid to change from the liquid state to the gaseous state or the mist state is short, and the more the reduction degree of the essence of the tobacco liquid generated by atomization is close to the taste of the real raw material, that is, the higher the reduction degree of the mouth feel of the tobacco is, the more the mouth feel of the tobacco is close to the ideal mouth feel.

Under the condition of the same heat conductivity coefficient, the larger the porosity is, the better the mouthfeel reduction degree is. The larger the porosity of the porous ceramic matrix 121 is, the more the amount of smoke liquid stored in the porous ceramic matrix 121 is, and the more the atomization is facilitated.

The following are specific examples of the present application.

Example 1:

firstly, weighing the raw materials of solid powder according to the following weight percentage: 25% of low-thermal conductivity silicate, 8% of diatomite, 7% of lithium carbonate and 20% of corn starch; and (3) putting the raw materials of the solid powder into a mixer, mixing for 3 hours, and drying for 2 hours at 90 ℃ to obtain the solid powder. Then weighing the following raw materials of organic solvent in percentage by weight: and (2) putting 20% of paraffin, 15% of polypropylene and 5% of fatty acid into an internal mixer, heating and melting at 150 ℃, putting the mixed solid powder into the internal mixer, and stirring and mixing the mixed solid powder with the melted organic solvent for 6 hours to obtain the mixed material. Then crushing the mixed material and performing injection molding to obtain a prefabricated biscuit; and placing the molded prefabricated biscuit into a de-waxing furnace for burning and de-waxing, wherein the de-waxing temperature is 650 ℃, the heating rate is 0.3 ℃/min when the temperature is below 400 ℃, and the heating rate is 3 ℃/min when the temperature is above 400 ℃, so as to obtain a pre-sintered blank. And finally, sintering the pre-sintered blank in a high-temperature sintering furnace at the sintering temperature of 1000 ℃ at the heating rate of 3 ℃/min for 2h to obtain the atomization core 12 provided by the application. The low-heat-conductivity silicate (the heat conductivity coefficient of the low-heat-conductivity silicate is less than 0.6W/(m.K)) is adopted for preparation, so that the power consumption is low, the battery duration is long, the reduction degree of tobacco liquid essence is high, no peculiar smell is generated in the atomization process, and the taste is good; meanwhile, the low-thermal-conductivity silicate material contains a proper amount of alumina, and can generate mullite with silicon dioxide under a high-temperature condition, so that the porous ceramic has high porosity and high strength, and the experience of a user can be better met.

Example 2:

firstly, weighing the raw materials of solid powder according to the following weight percentage: 30% of low thermal conductivity silicate, 10% of calcium silicate, 3% of zinc oxide, 2% of glass powder and 15% of polymethyl methacrylate; and (3) putting the raw materials of the solid powder into a mixer, mixing for 3 hours, and drying for 2 hours at 120 ℃ to obtain the solid powder. Then weighing the following raw materials of organic solvent in percentage by weight: 20% of paraffin, 5% of polyethylene, 3% of ethylene-propylene copolymer and 2% of di-n-butyl phthalate, putting the mixture into an internal mixer, heating and melting the mixture at 180 ℃, putting the mixed solid powder into the internal mixer, and stirring and mixing the mixed solid powder with the melted organic solvent for 6 hours to obtain the mixed material. Then crushing the mixed material and performing injection molding to obtain a prefabricated biscuit; and (3) placing the prefabricated biscuit into a de-waxing furnace for burning and de-waxing, wherein the de-waxing temperature is 800 ℃, the heating rate is 0.5 ℃/min when the de-waxing temperature is below 400 ℃, and the heating rate is 2 ℃/min when the de-waxing temperature is above 400 ℃, so that the pre-sintered biscuit is obtained. And finally, sintering the pre-sintered blank in a high-temperature sintering furnace at the sintering temperature of 1200 ℃, at the heating rate of 4 ℃/min, and preserving heat for 2 hours to obtain the atomization core 12 provided by the application.

Example 3:

firstly, weighing the raw materials of solid powder according to the following weight percentage: 40% of low-heat-conductivity silicate, 5% of glass powder and 15% of carbon powder; and (3) putting the raw materials of the solid powder into a mixer to mix for 3 hours, and drying for 2 hours at 150 ℃ to obtain a mixture. Then weighing the following raw materials of organic solvent in percentage by weight: 15% of paraffin, 15% of polypropylene, 5% of polyethylene and 5% of fatty acid are put into an internal mixer to be heated and melted at 200 ℃, and the mixed solid powder is put into the internal mixer to be mixed with the melted organic solvent for 6 hours, thus obtaining the mixed material. Then crushing the mixed material and performing injection molding to obtain a prefabricated biscuit; and (3) placing the prefabricated biscuit into a de-waxing furnace for burning and de-waxing, wherein the de-waxing temperature is 1000 ℃, the heating rate is 0.8 ℃/min when the de-waxing temperature is below 400 ℃, and the heating rate is 3 ℃/min when the de-waxing temperature is above 400 ℃, so as to obtain the pre-sintered biscuit. And finally, sintering the pre-sintered blank in a high-temperature sintering furnace at the sintering temperature of 1400 ℃, at the heating rate of 5 ℃/min for 2h to obtain the atomization core 12 provided by the application.

The atomization core comprises a porous ceramic matrix and a heating layer; the porous ceramic matrix is a low-thermal conductivity silicate porous ceramic matrix, and the thermal conductivity coefficient of the porous ceramic matrix is less than 0.3W/(m.K); the heating layer is arranged on the surface of the porous ceramic matrix. Through the arrangement, the atomizing core has no peculiar smell in the atomizing process; and the porous ceramic matrix has a lower heat conductivity coefficient, heat is concentrated on the atomizing surface of the atomizing core as far as possible, the atomizing temperature of the tobacco juice is reached in a short time, the consistency of the taste in the smoking process is ensured, the reduction degree of the tobacco juice is better, the taste of smoke is favorably promoted, and the cruising time of the battery is prolonged.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. An atomizing core for an electronic cigarette, comprising:

a porous ceramic matrix that is a low thermal conductivity silicate porous ceramic matrix having a thermal conductivity of less than 0.3W/(m.K);

and the heating layer is arranged on the surface of the porous ceramic matrix.

2. The atomizing core of claim 1, wherein the porous ceramic matrix has a porosity of 45% to 70%.

3. The atomizing core according to claim 1, wherein the porous ceramic matrix is prepared from raw materials including solid powder and an organic solvent, the solid powder includes low thermal conductivity silicate, pore-forming agent, diatomite, inorganic binder and sintering aid, and the organic solvent includes paraffin, plastic, surface modifier and plasticizer.

4. The atomizing core of claim 3, wherein the low thermal conductivity silicate has a thermal conductivity of less than 0.6W/(m-K).

5. The atomizing core of claim 3, wherein the low thermal conductivity silicate includes silica, magnesia, alumina, ferric oxide, and calcium oxide.

6. The atomizing core according to claim 5, wherein the silicon dioxide accounts for 40 to 75 weight percent of the low thermal conductivity silicate, the magnesium oxide accounts for 0.1 to 20 weight percent of the low thermal conductivity silicate, the aluminum oxide accounts for 0.1 to 17 weight percent of the low thermal conductivity silicate, the iron sesquioxide accounts for 0 to 24 weight percent of the low thermal conductivity silicate, and the calcium oxide accounts for 0 to 16 weight percent of the low thermal conductivity silicate.

7. The atomizing core according to claim 3, wherein the low thermal conductivity silicate is 30 to 80 weight percent of the solid powder, the pore former is 10 to 40 weight percent of the solid powder, the diatomite is 0 to 40 weight percent of the solid powder, the inorganic binder is 0 to 20 weight percent of the solid powder, and the sintering aid is 0 to 15 weight percent of the solid powder;

8. The atomizing core according to claim 3, wherein the pore-forming agent is one or more of polyvinyl chloride microspheres, polymethyl methacrylate, flour, corn starch and carbon powder; the inorganic binder is one or more of sodium silicate, calcium silicate and silica micropowder; the sintering aid is one or more of zinc oxide, titanium dioxide, glass powder and lithium carbonate; the plastic is one or more of polypropylene, polyethylene, polystyrene and polyamide; the surface modifier is one or more of fatty acid, aluminate coupling agent, silane coupling agent and ethylene-propylene copolymer; the plasticizer is one or more of diethyl phthalate, di-n-butyl phthalate and dioctyl phthalate.

9. An atomizer, comprising:

the liquid storage cavity is used for storing tobacco juice;

the atomization core is used for atomizing the tobacco juice; the atomizing core is the atomizing core of any one of claims 1 to 8.

10. An electronic cigarette, comprising:

an atomizer according to claim 9;

and the host is used for controlling the atomizer to work.

11. A method of preparing a porous ceramic matrix, comprising:

obtaining solid powder, wherein the solid powder comprises low-heat-conductivity silicate, a pore-forming agent, diatomite, an inorganic binder and a sintering aid;

obtaining an organic solvent, and adding the solid powder into the organic solvent to obtain a mixed material; wherein the organic solvent comprises paraffin, plastic, a surface modifier and a plasticizer;

performing injection molding on the mixed material to obtain a prefabricated biscuit;

performing glue removal on the prefabricated biscuit to obtain a pre-sintered blank;

and sintering the pre-sintered blank to obtain the porous ceramic matrix.

12. A method for preparing a porous ceramic matrix according to claim 11, wherein said obtaining solid powders comprises in particular:

13. The method of claim 11, wherein the obtaining the organic solvent and the adding the solid powder to the organic solvent to obtain the mixture specifically comprises:

14. A method of preparing a porous ceramic matrix according to claim 11, wherein the binder removal temperature is 500 ℃ to 1100 ℃;

15. A method of preparing a porous ceramic matrix according to claim 11, wherein the sintering temperature is 800 ℃ to 1600 ℃; and in the temperature rise process of sintering the pre-sintered blank, the temperature rise rate is 2-15 ℃/min.