WO2022135010A1

WO2022135010A1 - Porous ceramic atomization core and preparation method therefor, and electronic cigarette

Info

Publication number: WO2022135010A1
Application number: PCT/CN2021/132966
Authority: WO
Inventors: 赵波洋; 赵贯云; 齐会龙; 聂革; 宋文正; 胡勇齐; 李俊辉
Original assignee: 深圳市吉迩科技有限公司
Priority date: 2020-12-25
Filing date: 2021-11-25
Publication date: 2022-06-30
Also published as: CN112759414A

Abstract

Disclosed are a porous ceramic atomization core and a preparation method therefor, and an electronic cigarette. The preparation method for a porous ceramic atomization core comprises the following steps: carrying out a drying treatment on a ceramic aggregate and a sintering aid; mixing the dried ceramic aggregate, the dried sintering aid and a pore-forming agent to obtain a premix; internally mixing or kneading the premix, a binder and a dispersant to obtain an internally mixed/kneaded material; granulating or crushing the internally mixed/kneaded material to obtain a granular ceramic feed; carrying out injection molding on the granular ceramic feed to obtain a ceramic green body; carrying out a degreasing treatment on the ceramic green body under a powder burying condition of calcined alumina under a preset degreasing condition; and sintering a degreased ceramic blank, which is under an atmospheric condition, under a preset sintering condition to obtain a porous ceramic atomization core. The porous ceramic atomization core provided in the present application has a high strength, high material uniformity and high production efficiency, thereby improving the strength of the ceramic atomization core, and improving the production efficiency.

Description

Porous ceramic atomizing core and preparation method thereof, and electronic cigarette

This application claims the priority of the Chinese patent application filed on December 25, 2020 with the application number 2020115651617 and titled "A Porous Ceramic Atomizing Core and Its Preparation Method and Electronic Cigarette", the entire contents of which are Incorporated herein by reference.

technical field

The present application relates to the technical field of ceramic materials, in particular to a porous ceramic atomizing core and a preparation method thereof, and an electronic cigarette.

Background technique

Porous ceramic material is a kind of porous ceramic material with open pore diameter and high open porosity, which is made of high-quality raw materials such as corundum sand, silicon carbide, cordierite, etc., and is prepared by molding and special high-temperature sintering process. High temperature, high pressure, acid, alkali and organic medium corrosion resistance, good biological inertness, controllable pore structure and high open porosity, long service life, good product regeneration performance, etc., can be suitable for precision filtration of various media And separation, high pressure gas exhaust silencing, gas distribution and electrolytic diaphragm, etc.

As the heating element of electronic cigarette, the atomizer is one of the important components. When inhaling, it achieves the effect of "swallowing clouds and mist". With the development of technology, the carrier used to adsorb e-liquid in the atomizer mainly adopts inorganic non-metal atomizing core material, which not only has strong adsorption capacity, but also is non-toxic, harmless, safe and reliable, non-flammable and stable. Therefore, the porous ceramic atomizing core is one of the good materials suitable for absorbing smoke oil. Further, the porosity, strength, pore size and distribution of the porous ceramic atomizing core have an important impact on the atomization effect and smoking experience of the electronic cigarette.

In the current technology, the main methods for preparing porous ceramic atomizing cores include dry pressing, tape casting, hot die casting, and grouting. The main difficulty lies in precisely controlling the pore size, pore morphology and pore size of the porous ceramic atomizing core distribution, increase the porosity as much as possible, improve the atomization efficiency of e-liquid and reduce the cost. However, dry pressing, hot die casting, grouting, and tape casting have complex processes, high cost, low strength of the prepared porous ceramic atomizing core, and low forming efficiency, which are not conducive to automated production, so they are not conducive to industrial large-scale production. Application, the size and density of the aggregate of the porous ceramic atomizing core, the binder and the pore-forming agent are quite different, which is easy to cause poor material uniformity during the preparation process; and the dry pressing method requires high press pressure, low production efficiency, and poor performance. unstable.

In view of this, it is an urgent technical problem to be solved in the art to provide a new porous ceramic atomizing core for electronic cigarette and a preparation method thereof to overcome the above defects in the prior art.

Application content

Based on this, it is necessary to provide a porous ceramic atomizing core, a preparation method thereof, and an electronic cigarette in view of the above technical problems, so as to solve the problem that the porous ceramic atomizing core prepared by the existing process has low strength and low molding efficiency, which is not conducive to automatic production. The problem.

In order to solve the above-mentioned technical problems, the present application provides a porous ceramic atomizing core and its preparation method and electronic cigarette, adopting the following technical solutions:

A preparation method of a porous ceramic atomizing core, the porous ceramic atomizing core being applied to an electronic cigarette atomizing core, comprising the following steps:

Dry the ceramic aggregate and sintering aid;

Mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premix;

Banburying or kneading the premix, binder and dispersant to obtain banbury/kneading material; granulating or crushing the banburying/kneading material to obtain granular ceramic feed;

injecting the granular ceramic feedstock to obtain a ceramic green body;

The ceramic green body is subjected to degreasing treatment with preset degreasing conditions under the condition of burying powder of calcined alumina;

The ceramic blank obtained by degreasing is sintered under the atmospheric conditions under the preset sintering conditions to obtain the porous ceramic atomizing core.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in the present application, the particle size of the calcined alumina is 20-70 μm, and the burying condition of the calcined alumina is that the burying depth is 20-70 μm. 3 to 4 cm.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in the present application, the degreasing conditions are: heating from room temperature to 140-160°C for 0.5～ 1.5h, then heated to 240-260°C at a heating rate of 0.1-0.2°C/min, then heated to 440-460°C at a heating rate of 0.2-0.3°C/min for 1.5-2.5h, and then heated to 2.4-2.6°C The heating rate was raised to 890-910 °C for 0.5-1.5 h at a heating rate of /min, and finally cooled with the furnace.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in the present application, the sintering conditions are as follows: the temperature is raised from room temperature to 890-910°C at a heating rate of 4-6°C/min for 0.5- 1.5h, then the temperature was raised to 1100-1200°C at a heating rate of 1.5-2.5°C/min for 1.5-2.5h, and finally cooled with the furnace.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in the present application, the drying treatment conditions are drying at 115-125° C. for 2-4 hours.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in this application, the conditions for banburying or kneading are kneading or banburying at 80°C-140°C for 2-4 hours.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in the present application, the injection temperature in the injection molding is 50°C-70°C.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in this application, in the process of mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premixed In the step, taking the total amount of premix as 100%, in terms of mass percentage, the mass percentage of the ceramic aggregate is ~45-60%, the mass percentage of the sintering aid is 20-25%, and the The mass percentage of the pore agent is 20-30%.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in this application, in the process of banburying or kneading the premix with a binder and a dispersant to obtain banbury/kneading material In the step of mixing/kneading, the total amount of banburying/kneading material is 100%, in terms of mass percentage, the mass percentage of the premix is 55-65%, and the mass percentage of the binder is 30-40%, so The mass percentage of the dispersant is 1-5%.

As a preferred embodiment of the method for preparing the porous ceramic atomizing core provided in this application, the ceramic aggregate includes at least one of diatomite, feldspar, and quartz sand, all of which have firm, The advantages of wear resistance, high temperature resistance, wide source and low cost can ensure the strength and toughness of the porous ceramic atomizing core; the sintering aid includes at least one of low temperature lead-free glass powder, kaolin and tourmaline, which can play The sintering temperature is lowered to promote the densification of the ceramic body; the binder includes at least one of paraffin wax, beeswax, palm wax, and polyethylene, which can keep the body from deformation and reduce ceramic defects caused by thermal stress. , which is beneficial to improve the yield of the porous ceramic atomizing core; the pore-forming agent includes at least one of polymethyl methacrylate, polyvinyl alcohol, and polystyrene, which can control the pore size and pore size of the porous ceramic atomizing core rate, to obtain the interpenetrating pore structure in the porous ceramic atomizing core; the dispersing agent including stearic acid can ensure that the powder is fully mixed and dispersed during banburying and maintains uniformity.

A porous ceramic atomizing core is prepared by the above-mentioned preparation method of the porous ceramic atomizing core.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, the porous ceramic atomizing core has a micropore diameter of 10-30 μm, a density of 0.8-1.2 g/cm ³ , and a porosity of 50 μm. ~70%.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, the sintering conditions are as follows: the temperature is raised from room temperature to 890-910°C at a heating rate of 4-6°C/min for 0.5-1.5h, Then, the temperature is raised to 1100-1200°C at a heating rate of 1.5-2.5°C/min for 1.5-2.5h, and finally cooled with the furnace.

As a preferred embodiment of the porous ceramic atomizing core provided in the present application, the conditions of the drying treatment are drying at 115-125°C for 2-4 hours.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, the conditions of banburying or kneading are kneading or banburying at 80°C-140°C for 2-4 hours.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, the injection temperature in the injection molding is 50°C-70°C.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, in the step of mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premix, Taking the total amount of the premix to be 100%, in terms of mass percentage, the mass percentage of the ceramic aggregate is 45-60%, the mass percentage of the sintering aid is 20-25%, and the mass percentage of the pore-forming agent is 20-25%. The percentage is 20 to 30%.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, in the step of banburying or kneading the premix with a binder and a dispersant to obtain banbury/kneading material , the total amount of Banbury/kneading material is 100%, in terms of mass percentage, the mass percentage of the premix is 55-65%, the mass percentage of the binder is 30-40%, and the dispersant is The mass percentage is 1 to 5%.

As a preferred embodiment of the porous ceramic atomizing core provided in this application, the ceramic aggregate includes at least one of diatomite, feldspar, and quartz sand; the sintering aid includes low-temperature lead-free At least one of glass powder, kaolin and tourmaline; the binder includes at least one of paraffin, beeswax, palm wax and polyethylene; the pore-forming agent includes polymethyl methacrylate, polyvinyl alcohol , at least one of polystyrene; the dispersant includes stearic acid.

An electronic cigarette includes a main unit and the above-mentioned porous ceramic atomizing core, wherein the porous ceramic atomizing core is installed on the main unit.

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

In the present application, through the improved formula design, the ceramic aggregate, sintering aid and pore-forming agent are mixed, and then the binder and dispersing agent are used for banburying or kneading, injection molding, degreasing and sintering to obtain high porosity. , Porous ceramic atomizing core with uniform pore size, high green body strength, strong material uniformity, uniform pore size, applied to electronic cigarettes, good atomization effect, full taste, and high production efficiency, which is conducive to large-scale production. The present application solves the problems of low strength and low forming efficiency of the porous ceramic atomizing core prepared by the existing process, which is not conducive to automatic production. The porous ceramic atomizing core provided by the present application has high strength, strong material uniformity, high production efficiency, and improved The strength of the ceramic atomizing core improves production efficiency. The porous ceramic atomizing core prepared by the preparation method of the present application forms uniformly distributed micropores of 10-30 μm, the density is 0.8-1.2 g/cm3, and the porosity reaches 50-70%. It is applied to electronic cigarettes and atomized. The effect is good and the taste is full.

Description of drawings

In order to illustrate the solutions in the present application or the prior art more clearly, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description belong to the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of the porous ceramic atomizing core prepared in Example 1 of the application under an electron scanning microscope.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

Aiming at the technical problems of low strength, non-uniform pore size, low porosity, low molding efficiency, and unfavorable automatic production of the porous ceramic atomizing core prepared by the existing technology, the embodiment of the present application provides a preparation of a porous ceramic atomizing core The method, wherein the porous ceramic atomizing core is applied to an electronic cigarette atomizing core. Specifically, the preparation method of the porous ceramic atomizing core includes the following steps: (1) drying; (2) mixing; (3) banburying/kneading and granulation/crushing; (3) injection molding; (5) Degreasing treatment; (6) sintering treatment.

In this embodiment, the step (1) is specifically: drying the ceramic aggregate and the sintering aid. The ceramic aggregate and sintering aid are placed in a drying oven at 120°C for 2-4 hours, and the moisture adsorbed by the powder is discharged.

In this embodiment, the step (2) is specifically: mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premix. The dried ceramic aggregate, sintering aid and pore-forming agent are weighed according to the mass ratio and placed on a three-dimensional mixer or ball mill for mixing.

In this embodiment, the step (3) is specifically as follows: banburying or kneading the premix, binder and dispersant to obtain banbury/kneading material; and then granulating or crushing the banburying/kneading material. , get granular ceramic feed.

Wherein, the premix and the binder are placed in a kneader or an internal mixer for kneading or internal mixing. It should be noted that after melting the binder first, add the premix consisting of ceramic aggregate, sintering aid and pore-forming agent powder, knead or banbury at 80℃-140℃ for 2- 4h. Next, the muddy material obtained after banburying, namely banburying/kneading material, is placed in a granulator for granulation or cooled and then placed in a crusher for crushing.

In this embodiment, the step (4) is specifically as follows: injecting the granular ceramic feedstock to obtain a ceramic green body. The crushed granular ceramic feed is added to a special injection molding machine for ceramics for injection molding, and the injection temperature is 50°C-70°C.

In this embodiment, the step (5) is specifically as follows: degreasing the ceramic green body under the condition of burying the calcined alumina.

In other embodiments of the present application, the degreasing condition of the degreasing treatment is to heat up from room temperature to 140 to 160° C. for 0.5 to 1.5 h at a heating rate of 0.4 to 0.6° C./min, and then to heat at a temperature of 0.1 to 0.2° C./min for 0.5 to 1.5 hours. The temperature is increased to 240～260℃ at a rate of 0.2～0.3℃/min, then the temperature is increased to 440～460℃ for 1.5～2.5h at a heating rate of 0.2～0.3℃/min, and then the temperature is increased to 890～910℃ at a heating rate of 2.4～2.6℃/min for 0.5 hours. ~1.5h, and finally cooled with the furnace. Different heating rates are used in different temperature sections, which can better allow different raw materials to be decomposed and released at appropriate temperature sections, and further provide the dimension of the ceramic embryo, avoiding the problem of collapse due to incomplete decomposition caused by a single heating rate or rapid heating.

Specifically, the degreasing treatment is carried out under the condition of burying powder of calcined α _- Al ₂ O ₃ (alumina ₎ . The capillary effect of the fine powder increases the rate of debinding, and prevents the ceramic from collapsing due to its own gravity during debinding by the above-mentioned specific debinding conditions, so as to maintain the overall dimension of the product.

In this embodiment, the step (6) is specifically: sintering the ceramic blank obtained by degreasing under atmospheric conditions to obtain a porous ceramic atomizing core.

In other embodiments of the present application, the sintering process is to heat up from room temperature to 890-910°C for 0.5-1.5 h at a heating rate of 4-6°C/min, and then heat up at a heating rate of 1.5-2.5°C/min To 1100 ~ 1200 ℃ heat preservation for 1.5 ~ 2.5h, and finally cooling with the furnace.

The binder, pore-forming agent, and dispersing agent described in the present application are completely volatilized and decomposed during the degreasing and sintering process, and are completely removed from the ceramic matrix, so as to avoid organic residues and maintain a good porosity. The porous ceramic atomizing core prepared by the preparation method of the present application forms uniformly distributed micropores of 10-30 μm, the density is 0.8-1.2 g/cm ³ , and the porosity reaches 50-70%. The effect is good and the taste is full.

In the present application, through the improved formula design, the ceramic aggregate, sintering aid and pore-forming agent are mixed, and then the binder and dispersing agent are used for banburying or kneading, injection molding, degreasing and sintering to obtain high porosity. , Porous ceramic atomizing core with uniform pore size, high green body strength, strong material uniformity, uniform pore size, applied to electronic cigarettes, good atomization effect, full taste, and high production efficiency, which is conducive to large-scale production. The present application solves the problems of low strength and low forming efficiency of the porous ceramic atomizing core prepared by the existing process, which is not conducive to automatic production. The porous ceramic atomizing core provided by the present application has high strength, strong material uniformity, high production efficiency, and improved The strength of the ceramic atomizing core improves production efficiency.

In this embodiment, in the step (2), the total amount of premix is 100%, the mass percentage of the ceramic aggregate is 45-60%, and the sintering aid is 45-60% by mass. The mass percentage is 20-25%, and the mass percentage of the pore-forming agent is 20-30%.

In this embodiment, in the step (3), the total amount of Banbury/kneading material is 100%, and the mass percentage of the premix is 55-65% by mass percentage, and the adhesive The mass percentage of the agent is 30-40%, and the mass percentage of the dispersing agent is 1-5%.

In this embodiment, the ceramic aggregate includes at least one of diatomaceous earth, feldspar (such as potassium feldspar, albite), and quartz sand; The advantages of wide range and low cost can ensure the strength and toughness of the porous ceramic atomizing core; the sintering aid includes at least one of low-temperature lead-free glass powder, kaolin or tourmaline, which can reduce the sintering temperature and promote the ceramic blank. The effect of body densification; the binder includes at least one of paraffin wax, beeswax, palm wax, and polyethylene, which can keep the green body from deformation, can reduce the ceramic defects caused by thermal stress, and is conducive to improving the porous ceramic mist. The yield of the atomizing core; the pore-forming agent includes at least one of polymethyl methacrylate, polyvinyl alcohol, and polystyrene, which can control the pore size and porosity of the porous ceramic atomizing core, and obtain the porous ceramic atomizing core. The interpenetrating pore structure in the core; the dispersant includes stearic acid, which can ensure that the powder is fully mixed and dispersed during banburying and maintains uniformity.

Preferably, after the step (6), ultrasonic cleaning is further included: ultrasonic cleaning is performed on the degreasing and sintered porous ceramic atomizing core, and finally, the finished product is obtained by drying in an oven.

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings.

Example 1:

This embodiment provides a preparation method of a porous ceramic atomizing core for an electronic cigarette atomizing core, which includes the following steps:

(1) Drying: The ceramic aggregate and sintering aid are placed in a drying oven at 120°C for 2 hours, and the moisture adsorbed by the powder is discharged;

(2) Mixing: by mass percentage, weigh 40% of diatomite, 10% of potassium feldspar, 12% of kaolin, 8% of glass powder and 30% of polystyrene pore-forming agent, respectively, and put them into a three-dimensional mixer to mix 2h, the premix is formed after mixing uniformly; in this step, the average particle size of the polystyrene pore-forming agent is controlled to be 50 μm;

(3) Kneading and crushing: by mass percentage, add 60% of premix, 25% of paraffin, 5% of beeswax, 5% of low-density polyethylene and 5% of stearic acid into the kneader, and mix at 145°C Kneading for 3 hours, and cooling after kneading to obtain bulk ceramic kneading material, which is then put into a jaw crusher for crushing to obtain granular ceramic feedstock with uniform size;

(4) Injection molding: The ceramic green body is obtained by the injection molding process. The process parameters are: the molding pressure is 20bar, the speed is 20cm ³ /s, the injection temperature is 100°C, and the mold temperature is 30°C to obtain a ceramic green body. blank;

(5) Degreasing treatment: The ceramic green body is placed in an alumina saggar, and calcined alumina powder with a thickness of 3 cm is buried. The particle size of the alumina powder is 70um, and the saggar is placed in a degreasing furnace. The heating rate per min was raised from room temperature to 150°C, held for 1 h, then heated to 250°C at a rate of 0.1°C/min, then heated to 450°C at a rate of 0.2°C/min, held for 2 hours, and then heated to 2.5°C/min The heating rate was raised to 900 °C, kept for 1 h, and finally cooled to room temperature with the furnace;

(6) Sintering treatment: take out the degreasing ceramic material from the degreasing furnace, clean the alumina powder on the surface, put the ceramic material in an alumina sagger, and place it in an atmospheric sintering furnace for pressureless sintering. The sintering process is as follows: heating from room temperature to 900 °C for 1 h at a heating rate of 5 °C/min, then heating to 1150 °C for 2 h at a heating rate of 2 °C/min, and finally cooling to room temperature with the furnace to obtain a porous ceramic atomizing core .

The performance of the prepared porous ceramic atomizing core is tested, and the specific experimental data are as follows:

孔隙率Porosity	平均孔径Average pore size	抗压强度Compressive strength	密度density	吸油时间Oil absorption time
63.15％63.15%	22um22um	7.6MPa7.6MPa	0.85g/cm ³ 0.85g/ ^cm3	21s21s

Figure 1 shows the pore structure of the porous ceramic atomizing core prepared in this example under an electron scanning microscope. It can be seen from the figure that the porous ceramic atomizing core prepared in this example has uniformly distributed pores.

Example 2:

(1) Drying: Place the ceramic aggregates and sintering aids in a drying oven at 120 °C for 3 hours, and discharge the moisture adsorbed by the powder;

(2) Mixing: in terms of mass percentage, weigh 35% of diatomite, 10% of quartz sand, 10% of kaolin, 15% of glass powder and 30% of polystyrene pore-forming agent, respectively, put them into a three-dimensional mixer and mix for 2 hours , and the premix is formed after mixing evenly; in this step, the average particle size of the polystyrene pore-forming agent is controlled to be 50 μm;

(3) Banburying and granulation/crushing: by mass percentage, mix 60% of premix, 25% of paraffin, 5% of beeswax, 3% of palm wax, 3% of ethylene-vinyl acetate copolymer and 4% of stearic acid Add it into the mixer, carry out the mixer at 80°C for 4 hours, cool to get the bulk ceramic mixer/kneading material, and then put it into the jaw crusher for crushing to obtain the granular ceramic feed with uniform size;

(4) Injection molding: The ceramic green body is obtained by the injection molding process. The process parameters are: the molding pressure is 20bar, the speed is 20cm ³ /s, the injection temperature is 55°C, and the mold temperature is 26°C to obtain a ceramic green body. blank;

(5) Degreasing treatment: The ceramic green body is placed in an alumina sagger, and calcined alumina powder with a thickness of 2 cm is buried. The particle size of the alumina powder is 50 μm. The saggar is placed in a degreasing furnace. The degreasing conditions are: 0.5 ° C The heating rate per min was raised from room temperature to 150°C, held for 1 h, then heated to 250°C at a rate of 0.1°C/min, then heated to 450°C at a rate of 0.2°C/min, held for 2 hours, and then heated to 2.5°C/min The heating rate was raised to 900 °C, kept for 1 h, and finally cooled to room temperature with the furnace;

(6) Sintering treatment: take out the degreasing ceramic material from the degreasing furnace, clean the alumina powder on the surface, put the ceramic material in an alumina sagger, and place it in an atmospheric sintering furnace for pressureless sintering. The sintering process is as follows: heating from room temperature to 900 °C for 1 h at a heating rate of 5 °C/min, then heating to 1100 °C for 2 h at a heating rate of 2 °C/min, and finally cooling to room temperature with the furnace to obtain a porous ceramic atomizing core .

孔隙率Porosity	平均孔径Average pore size	抗压强度Compressive strength	密度density	吸油时间Oil absorption time
66.94％66.94%	17um17um	6.9MPa6.9MPa	0.81g/cm ³ 0.81g/ ^cm3	17s17s

Example 3:

(1) Drying: Place the ceramic aggregates and sintering aids in a drying oven at 120 °C for 4 hours, and discharge the moisture absorbed by the powder;

(2) Mixing: by mass percentage, weigh 50% of diatomite, 10% of albite, 5% of kaolin, 15% of glass powder and 20% of polystyrene pore-forming agent and put them into the jar of the bedroom ball mill Mixing for 2 hours, the premix is formed after mixing uniformly; in this step, the average particle size of the polystyrene pore-forming agent is controlled to be 50 μm;

(3) Kneading and crushing: by mass percentage, add 60% of premix, 25% of paraffin, 5% of beeswax, 5% of low-density polyethylene and 5% of stearic acid into the kneader, and mix at 140°C Kneading for 3 hours, and cooling after kneading to obtain bulk ceramic kneading material, which is then put into a jaw crusher for crushing to obtain granular ceramic feedstock with uniform size;

(4) Injection molding: The ceramic green body is obtained by the injection molding process. The process parameters are as follows: the molding pressure is 20 bar, the speed is 20 cm ³ /s, the injection temperature is 60 °C, and the mold temperature is 30 °C, and the ceramic green body is obtained. blank;

(5) Degreasing treatment: The ceramic green body is placed in an alumina sagger, and calcined alumina powder with a thickness of 3 cm is buried. The particle size of the alumina powder is 70 μm. The saggar is placed in a degreasing furnace. The degreasing conditions are: 0.5 ° C The heating rate was raised from room temperature to 150°C/min, kept for 1 h, then heated to 250°C at a rate of 0.1°C/min, then heated to 450°C at a rate of 0.2°C/min, held for 2 hours, and then heated to 2.5°C/min The heating rate was raised to 900 °C, kept for 1 h, and finally cooled to room temperature with the furnace;

(6) Sintering treatment: take out the degreasing ceramic material from the degreasing furnace, clean the alumina powder on the surface, put the ceramic material in an alumina sagger, and place it in an atmospheric sintering furnace for pressureless sintering. The sintering process is as follows: heating from room temperature to 900 °C for 1 h at a heating rate of 5 °C/min, then heating to 1180 °C for 2 h at a heating rate of 2.2 °C/min, and finally cooling to room temperature with the furnace to obtain a porous ceramic atomizing core .

孔隙率Porosity	平均孔径Average pore size	抗压强度Compressive strength	密度density	吸油时间Oil absorption time
65.86％65.86%	24um24um	8.2MPa8.2MPa	0.98g/cm ³ 0.98g/cm ³	30s30s

Example 4

This embodiment provides an electronic cigarette, which includes a main body and a porous ceramic atomizing core, and the porous ceramic atomizing core is installed on the main body. Wherein, the porous ceramic atomizing core can be the porous ceramic atomizing core prepared by any of the methods in Examples 1-3.

The porous ceramic atomizing core used in this embodiment has high porosity, uniform pore size, high green body strength, strong material uniformity, and uniform pore size. When applied to electronic cigarettes, the atomization effect is good and the taste is full.

Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The accompanying drawings show the preferred embodiments of the present application, but do not limit the scope of the patent of the present application. This application may be embodied in many different forms, rather these embodiments are provided so that a thorough and complete understanding of the disclosure of this application is provided. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. . Any equivalent structures made by using the contents of the description and drawings of this application, which are directly or indirectly used in other related technical fields, are all within the scope of protection of the patent of this application.

Claims

A preparation method of a porous ceramic atomizing core, comprising the following steps:

Dry the ceramic aggregate and sintering aid;

Mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premix;

Banburying or kneading the premix, binder and dispersant to obtain banbury/kneading material; granulating or crushing the banburying/kneading material to obtain granular ceramic feed;

injecting the granular ceramic feedstock to obtain a ceramic green body;

degreasing the ceramic green body under the condition of burying powder of calcined alumina with preset degreasing conditions;

The ceramic blank obtained by degreasing is sintered under the atmospheric conditions under the preset sintering conditions to obtain the porous ceramic atomizing core.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the particle size of the calcined alumina is 20-70 μm, and the burying condition of the calcined alumina is that the burying depth is 3-4 cm.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the degreasing conditions are: heating from room temperature to 140-160°C at a heating rate of 0.4-0.6°C/min for 0.5-1.5h, and then heating with The heating rate is 0.1～0.2°C/min to 240～260°C, then the temperature is raised to 440～460°C at the heating rate of 0.2～0.3°C/min and the temperature is kept for 1.5～2.5h, and then the heating rate is 2.4～2.6°C/min. The temperature is raised to 890～910℃ and kept for 0.5～1.5h, and finally cooled with the furnace.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the sintering conditions are: heating from room temperature to 890-910°C at a heating rate of 4-6°C/min for 0.5-1.5h, and then heating at a temperature of 4-6°C/min. The heating rate of 1.5～2.5℃/min was heated to 1100～1200℃ and kept for 1.5～2.5h, and finally cooled with the furnace.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the drying treatment conditions are drying at 115-125° C. for 2-4 hours.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the conditions for banburying or kneading are kneading or banburying at 80°C-140°C for 2-4 hours.
The method for preparing a porous ceramic atomizing core according to claim 1, wherein the injection temperature in the injection molding is 50°C-70°C.
The method for preparing a porous ceramic atomizing core according to any one of claims 1 to 7, wherein, in the process of mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premixed In the step, taking the total amount of premix as 100%, in terms of mass percentage, the mass percentage of the ceramic aggregate is 45-60%, the mass percentage of the sintering aid is 20-25%, and the pore-forming agent is 20-25%. The mass percentage of the agent is 20-30%.
The method for preparing a porous ceramic atomizing core according to any one of claims 1 to 7, wherein the banburying/kneading material is obtained by banburying or kneading the premix with a binder and a dispersant. In the step of mixing/kneading, the total amount of banburying/kneading material is 100%, in terms of mass percentage, the mass percentage of the premix is 55-65%, and the mass percentage of the binder is 30-40%, so The mass percentage of the dispersant is 1-5%.
The method for preparing a porous ceramic atomizing core according to any one of claims 1 to 7, wherein the ceramic aggregate comprises at least one of diatomite, feldspar, and quartz sand; the sintering aid comprises At least one of low-temperature lead-free glass powder, kaolin and tourmaline; the binder includes at least one of paraffin, beeswax, palm wax, and polyethylene; the pore-forming agent includes polymethyl methacrylate, At least one of polyvinyl alcohol and polystyrene; the dispersant includes stearic acid.
A porous ceramic atomizing core is prepared by the preparation method described in any one of claims 1-3.
The porous ceramic atomizing core according to claim 11, wherein the micropore diameter of the porous ceramic atomizing core is 10-30 μm, the density is 0.8-1.2 g/cm 3 , and the porosity is 50-70%.
The porous ceramic atomizing core according to claim 11, wherein the sintering conditions are: heating from room temperature to 890-910°C at a heating rate of 4-6°C/min for 0.5-1.5h, and then heating at 1.5-2.5°C for 0.5-1.5 hours. The heating rate was raised to 1100-1200 °C for 1.5-2.5 h at a heating rate of /min, and finally cooled with the furnace.
The porous ceramic atomizing core according to claim 11, wherein the conditions of the drying treatment are drying at 115-125°C for 2-4 hours.
The porous ceramic atomizing core according to claim 11, wherein the conditions of banburying or kneading are kneading or banburying at 80°C-140°C for 2-4 hours.
The porous ceramic atomizing core according to claim 11, wherein the injection temperature in the injection molding is 50°C-70°C.
The porous ceramic atomizing core according to any one of claims 11 to 16, wherein, in the step of mixing the dried ceramic aggregate, sintering aid and pore-forming agent to obtain a premix, The total amount of premix is 100%. In terms of mass percentage, the mass percentage of the ceramic aggregate is 45-60%, the mass percentage of the sintering aid is 20-25%, and the mass percentage of the pore-forming agent is 20-25%. 20 to 30%.
The porous ceramic atomizing core according to any one of claims 11 to 16, wherein, in the step of banburying or kneading the premix with a binder and a dispersant to obtain banbury/kneading material, Taking the total amount of Banbury/kneading materials as 100%, in terms of mass percentage, the mass percentage of the premix is 55-65%, the mass percentage of the binder is 30-40%, and the dispersant is 30-40%. The mass percentage is 1-5%.
The porous ceramic atomizing core according to any one of claims 11 to 16, wherein the ceramic aggregate comprises at least one of diatomite, feldspar, and quartz sand; and the sintering aid comprises low-temperature lead-free glass At least one of powder, kaolin and tourmaline; the binder includes at least one of paraffin, beeswax, palm wax, polyethylene; the pore-forming agent includes polymethyl methacrylate, polyvinyl alcohol, At least one of polystyrene; the dispersant includes stearic acid.
An electronic cigarette, comprising a main unit and the porous ceramic atomizing core according to any one of claims 11-19, wherein the porous ceramic atomizing core is installed on the main unit.