CN116784529A - Liquid storage part, atomizer, aerosol generating device and liquid storage part preparation method - Google Patents

Abstract

The application provides a liquid storage piece, an atomizer, an aerosol generating device and a liquid storage piece preparation method, wherein an ether ammonolysis is carried out in a mixed solvent of dioxane (Diox) and Tertiary Butyl Alcohol (TBA) through a fluorine-containing aromatic dianhydride monomer and a diamine monomerThe polyamide acid (PAA) solution is formed by reaction, ammonium chloride particles are taken as pore-forming agents, the polyamide acid (PAA) solution added with the ammonium chloride particles is injected into a mould to be frozen, and the PAA-NH is obtained by freeze drying ₄ After the Cl aerogel is subjected to thermal imidization treatment, the porous polyimide aerogel can be prepared. The preparation method of the liquid storage piece provided by the embodiment of the application can reasonably regulate and control the pore size of the porous polyimide aerogel according to the use requirement, has the advantages of short preparation flow and simple process, can reduce the instability of the product caused by unstable factors, and can reduce the manufacturing cost, energy consumption and pollutant emission of the liquid storage piece.

Description

Liquid storage part, atomizer, aerosol generating device and preparation method of liquid storage part

Technical field

The invention belongs to the field of atomization technology, and in particular, relates to a liquid storage part, an atomizer, an aerosol generating device and a method for preparing a liquid storage part.

Background technique

The aerosol generating device usually includes an atomizer and a power supply device electrically connected to the atomizer. The atomizer can heat and atomize the aerosol-forming matrix stored in the atomizer under the electric driving action of the power supply device. Aerosols are formed. At present, atomizers are generally provided with a liquid storage chamber, and a liquid storage part is provided in the liquid storage chamber. The liquid storage part is usually made of fiber cotton. Since the structure of fiber cotton is relatively soft and fluffy, atomized liquid leakage is likely to occur when the liquid storage part is subjected to a large squeezing force, and when the liquid storage part is subjected to a small squeezing force, it is easy to cause a large amount of residual atomized liquid. many.

Contents of the invention

Based on the above-mentioned problems existing in the prior art, one of the purposes of the embodiments of the present invention is to provide a liquid storage member to solve the problems in the prior art of leakage of liquid storage member or residual atomized liquid in the liquid storage member. question.

In order to achieve the above object, the technical solution adopted by the present invention is to provide a liquid storage member for use in an atomizer. The atomizer includes an atomization bomb body and a mist for atomizing the atomized liquid to form an aerosol. atomization core, the atomization core is arranged in the main body of the atomization bomb, the main body of the atomization bomb is provided with a liquid storage chamber, and the liquid storage member is arranged in the liquid storage cavity; the liquid storage member It is a porous aerogel, so that the liquid storage member can be used to store atomized liquid, and the liquid storage member can transfer the stored atomized liquid to the atomization core.

Optionally, the porous airgel is a porous airgel matrix made of polyimide.

Optionally, the porous aerogel has a liquid storage capacity of 800 to 1000 mg/g.

The liquid storage member according to claim 1, wherein the porous aerogel has a pore diameter of 0.1 to 100 μm.

Optionally, the porous aerogel is columnar, the porous aerogel is provided with a set of holes through the axial direction, and the atomization core is located in the set of holes.

Optionally, the outer peripheral surface of the porous aerogel conflicts with the inner surface of the liquid storage chamber, and the hole wall of the sleeve hole conflicts with the outer peripheral surface of the atomization core.

Based on the above-mentioned problems existing in the prior art, the second object of the embodiments of the present invention is to provide an atomizer having a liquid storage member provided by any of the above-mentioned solutions.

In order to achieve the above object, the technical solution adopted by the present invention is to provide an atomizer including the liquid storage member provided by any of the above solutions.

Optionally, the atomization core includes an atomization bracket provided in the atomization bomb body, a heating body provided in the atomization bracket, and a liquid guide for transmitting atomized liquid to the heating body. The liquid guide member is provided in the atomization bracket, and the atomization bracket is provided with a liquid guide port for transmitting atomized liquid to the liquid guide member, and the porous aerogel shields the guide liquid port.

Optionally, the atomization bomb body includes an atomization housing provided with an air suction port, a base provided on the bottom opening of the atomization housing, and a breather tube provided in the atomization housing, The atomizing core is supported on the base, the vent pipe connects the atomizing core and the suction port, and the inside of the atomizing shell is outside the atomizing core and the associated vent pipe. The liquid storage chamber is defined, the atomization core is provided with a liquid conduction port connected to the liquid storage chamber, and the porous aerogel seals the liquid conduction port.

Based on the above problems existing in the prior art, the third object of the embodiments of the present invention is to provide an aerosol generating device having a liquid storage member or an atomizer provided by any of the above solutions.

In order to achieve the above object, the technical solution adopted by the present invention is to provide an aerosol generating device, including the liquid storage member or the atomizer provided by any of the above solutions.

Compared with the existing technology, one or more of the above technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

The liquid storage part, atomizer and aerosol generating device in the embodiment of the present invention use porous aerogel as the liquid storage part to store the atomized liquid. Since the porous aerogel has good structural tightness, it can prevent the liquid storage part from Severe deformation occurs due to squeezing, thereby overcoming the existing technology that uses fiber cotton as a liquid storage part. When the squeezing force on the liquid storage part is small, atomized liquid leakage is prone to occur, and when the liquid storage part is squeezed under When the pressure force is large, it is easy to cause the defect of large residual amount of atomized liquid. In addition, porous aerogels can easily modify surface functional groups, expand the range and space of surface polarity control, and can greatly retain surface lipophilic groups. Using porous aerogels as liquid storage parts is conducive to rapid atomization of liquids. transmission. In addition, the softness and hardness of the porous aerogel can be adjusted according to actual use needs. The porous aerogel does not lose powder and does not release small particles of raw materials to avoid damage to the human respiratory tract.

Based on the above-mentioned problems existing in the prior art, the fourth object of the embodiments of the present invention is to provide a method for preparing a liquid storage member.

In order to achieve the above object, the technical solution adopted by the present invention is to provide a method for preparing a liquid storage member, which includes the following steps:

Step S01: Mix dioxane and tert-butyl alcohol solution to obtain a mixed solvent;

Step S02: Add fluorine-containing aromatic dianhydride monomer and diamine monomer to the mixed solvent, and obtain a polyamic acid solution through the ammonolysis reaction of ether;

Step S03: Add ammonium chloride particles to the polyamic acid solution and stir evenly to obtain a PAA-NH ₄ Cl suspension.

Step S04: Inject the PAA-NH ₄ Cl suspension into a mold for freezing, and obtain PAA-NH ₄ Cl aerogel through freeze-drying;

Step S05: Heat the demolded PAA-NH ₄ Cl aerogel, and prepare a porous polyimide aerogel that can be used as a liquid storage member through thermal imidization treatment.

Optionally, in step S01, the volume proportion of the tert-butyl alcohol solution in the mixed solvent is 0 to 30%.

Optionally, in step S04, the freezing rate of the freeze-drying process is 5-10°C/min.

Optionally, in step S03, the particle size of the ammonium chloride particles is between 60 and 140 μm.

Optionally, in step S03, the mass of the ammonium chloride particles added is 1 to 10 g.

Optionally, in the step S05, the temperature rise rate of the thermal imidization treatment is 1 to 5°C/min.

Optionally, in step S05, the temperature of the thermal imidization treatment is 240 to 270°C, and the time of the thermal imidization treatment is 0.5 to 2 hours.

Optionally, in step S02, the added fluorine-containing aromatic dianhydride monomer and diamine monomer are in an equal molar ratio.

Optionally, in step S05, the mass percentage of the polyamic acid solution generated by the reaction in the fluorinated aromatic dianhydride monomer and diamine monomer is 10 to 20%.

Compared with the existing technology, one or more of the above technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

The liquid storage member preparation method in the embodiment of the present invention uses fluorine-containing aromatic dianhydride monomer and diamine monomer to perform ammonolysis of ether in a mixed solvent of dioxane (Diox) and tert-butyl alcohol (TBA). The reaction forms a polyamic acid (PAA) solution, using ammonium chloride particles as a pore-forming agent, and the polyamic acid (PAA) solution with added ammonium chloride particles is injected into the mold for freezing, and the resulting PAA-NH is freeze-dried. After thermal imidization treatment of ₄ Cl aerogel, a porous polyimide aerogel that can be used as a liquid storage component can be prepared. The liquid storage member preparation method provided by the embodiment of the present invention can reasonably regulate the pore size of the porous polyimide aerogel according to the needs of use. The preparation process is short and the process is simple. It can not only reduce product instability caused by unstable factors It is flexible and can reduce the production cost, energy consumption and pollutant emissions of liquid storage parts.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings in the following description are only illustrative of the present invention. For some embodiments, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic three-dimensional structural diagram of a liquid storage member provided by an embodiment of the present invention;

Figure 2 is a schematic three-dimensional structural diagram of an atomizer provided by an embodiment of the present invention;

Figure 3 is an assembly diagram of the atomizer and liquid storage parts provided by the embodiment of the present invention;

Figure 4 is a schematic cross-sectional structural view of an atomizer provided by an embodiment of the present invention;

Figure 5 is an exploded view of the atomizing core provided by the embodiment of the present invention;

Figure 6 is an exploded view of the atomizer provided by the embodiment of the present invention.

Among them, each figure in the figure is marked with:

1-porous airgel; 11-holes;

2-Atomizer; 21-Atomizer bomb body; 211-Atomizer shell; 212-Base; 213-Breath tube; 22-Atomizer core; 221-Atomizer bracket; 222-Heating element; 223-Liquid conductor pieces;

3-suction port; 4-liquid guide port; 5-liquid storage chamber;

6-Suction nozzle; 7-Sealing plug.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited. "Plural" means one or more than one, unless otherwise expressly and specifically limited.

In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", " The directions or positional relationships indicated by "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings and are for convenience only. The invention is described and the description is simplified without indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore is not to be construed as a limitation of the invention.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout this specification, and not all are referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Please refer to Figure 1, Figure 3 and Figure 4 together to describe the liquid storage member provided by the embodiment of the present invention. The liquid storage member provided by the embodiment of the present invention is used in the atomizer 2. The atomizer 2 includes an atomization bomb body 21 and an atomization core 22 for atomizing the atomization liquid to form an aerosol. The atomization core 22 is disposed on In the atomizer bomb main body 21, a liquid storage chamber 5 is provided inside the atomizer bomb main body 21, and the liquid storage member is arranged in the liquid storage chamber 5. The liquid storage part is a porous aerogel 1 that can absorb, store and transmit atomized liquid, and the liquid storage part can transmit the stored atomized liquid to the atomizing core 22. The atomizing core 22 generates heat after being powered on, and the mist is transferred to the atomizing core 22. The liquid is heated and atomized to form an aerosol.

Compared with the existing technology, the liquid storage member provided by the embodiment of the present invention uses porous aerogel 1 as the liquid storage member for storing atomized liquid. Due to the good structural tightness of the porous airgel 1, it can prevent the liquid storage member from Severe deformation occurs due to squeezing, thereby overcoming the existing technology that uses fiber cotton as a liquid storage part. When the squeezing force on the liquid storage part is small, atomized liquid leakage is prone to occur, and when the liquid storage part is squeezed under When the pressure force is large, it is easy to cause the defect of large residual amount of atomized liquid. In addition, porous aerogel 1 can easily modify surface functional groups, expand the range and space of surface polarity control, and can greatly retain surface lyophilic groups. Using porous aerogel 1 as a liquid storage component is beneficial to atomizing liquid of fast transfer. In addition, the softness and hardness of the porous aerogel 1 can be adjusted according to actual use needs. The porous aerogel 1 does not lose powder and does not release small particles of raw materials to avoid damage to the human respiratory tract.

In some embodiments, the porous airgel 1 is a porous airgel matrix made of polyimide. Since the porous airgel matrix made of polyimide is molded through a mold, complex mechanisms can be made, and the shape, size and tolerance can be controlled. The porous airgel matrix made of polyimide can easily be modified with surface functional groups, expanding the range and space of surface polarity control. On the one hand, the surface functional groups can be designed, and on the other hand, the preparation temperature is 200 to 300°C, which can greatly retain surface lyophilic groups. The porous airgel matrix made of polyimide can achieve surface functional group modification. When it has abundant surface functional groups, metal ions will precipitate during the contact between the heating element 222 of the atomizing core 22 and the atomizing liquid. The rich functional groups on the surface of porous polyimide can effectively capture metal ions and reduce the release of heavy metal ions in aerosols. The porous airgel matrix made of polyimide has adjustable liquid storage performance and better liquid storage performance. The liquid storage capacity of porous polyimide can reach 800~1000mg/g, which is larger than that of porous ceramics. Amount (600~800mg/g). The porous airgel matrix is made of polyimide, and the pore size can be adjusted from 0.1 to 100 microns. It is not only suitable for fruit-flavored atomization liquids, but also atomization liquids with high viscosity. The porous airgel matrix made of polyimide has a nanoporous structure inside. The micropores in the nanoporous structure can be less than or equal to 2nm, so that the micropores in the nanoporous structure can lock liquid. Mesopores with a pore diameter of 2 to 50 nm have good liquid-locking properties), and macropores with a pore diameter greater than 50 nm in the nanoporous structure have good liquid conductivity. Moreover, the pore size of the nanoporous structure is adjustable, and the conductivity can be designed and explored. The balance point between liquid and liquid locking can coordinately solve the problems of leakage and residual liquid. The porous airgel matrix made of polyimide solves the problem of adhesion of traditional liquid storage cotton materials to plastic parts in contact with the atomized liquid medium, and improves chemical safety and product stability. The porous aerogel matrix made of polyimide has adjustable mechanical properties (soft and hard control). The advantage of being hard is that when the liquid storage part is assembled to the atomizer 2, the structure is not easy to collapse, the powder does not fall off, and the integrity is high. High, it is not easy for fibers to disperse in the atomized liquid and enter the human body with suction; making it soft can be made elastic and structurally complete, which can improve assembly fit and product stability. The porous airgel matrix made of polyimide does not shed powder and does not involve the release of small particles of raw materials, thus avoiding damage to the human respiratory tract. Generally speaking, porous ceramics are made of granular ceramic powder with glass powder as a binder. Therefore, during the suction process, small particles of ceramic powder are released in the aerosol, which is harmful to the human respiratory tract.

In some embodiments, the pore diameter of the porous airgel 1 is 0.1 to 100 μm, and a porous airgel matrix made of polyimide is used. The micropore diameter in the nanoporous structure inside the porous airgel matrix can be Control between 0.1～100μm. For example, when the micropore diameter in the nanoporous structure is between 0.1 and 50 μm, the porous airgel matrix has good liquid-locking properties and can prevent liquid leakage; while when the micropore diameter in the nanoporous structure is between 50 and 100 μm, Polyimide has good liquid conductivity properties. In addition, the diameter of the micropores in the nanoporous structure inside the polyimide can be adjusted between 0.1 and 100 μm, making it easy to control the fineness and taste of the aerosol.

Please refer to Figure 1, Figure 2 and Figure 6 in combination. In some embodiments, the porous aerogel 1 is columnar, the porous aerogel 1 is provided with a set of holes 11 along the axial direction, and the atomizing core 22 is located in the set of holes 11. middle. When the porous airgel 1 is placed on the atomizing core 22, the porous aerogel 1 can cover the liquid guide port 4 on the atomizer core 22, so that the liquid storage chamber 5 and the liquid guide port 4 cannot be directly connected to prevent liquid storage. The atomized liquid in the cavity 5 directly enters the atomizing core 22 through the liquid guide port 4 . It can be understood that the outer outline of the porous airgel 1 can be cylindrical, elliptical columnar or prism-shaped, etc., and the shape and size of the porous airgel 1 is adapted to the shape and size of the liquid storage chamber 5 . Specifically, please refer to Figure 2, Figure 5 and Figure 6. In some embodiments, the atomization core 22 includes an atomization bracket 221 provided in the atomization bomb body 21, and a heating element provided in the atomization bracket 221. body 222 and a liquid guide 223 for transmitting atomized liquid to the heating element 222. The liquid guide 223 is provided in the atomization bracket 221. The atomization bracket 221 is provided with a liquid guide for transmitting atomized liquid to the liquid guide 223. Port 4, the porous airgel 1 covers the liquid guide port 4, so that the liquid storage chamber 5 and the liquid guide port 4 cannot be directly connected, effectively preventing the atomized liquid in the liquid storage chamber 5 from directly entering the atomization core 22 through the liquid guide port 4. . It should be noted that the liquid-conducting member 223 may be, but is not limited to, liquid-conducting cotton, porous ceramics, or a porous body made of polyimide, and the heating element 222 may be, but is not limited to, a mesh heating member, a spiral heating wire, or a heating element. sheet or heating film.

Please refer to FIG. 3 . In some embodiments, the outer peripheral surface of the porous airgel 1 conflicts with the inner surface of the liquid storage chamber 5 , and the hole wall of the sleeve hole 11 conflicts with the outer peripheral surface of the atomization core 22 to balance the porous airgel 1 . The liquid storage and liquid conduction capabilities of the airgel 1 ensure that the atomized liquid can be transmitted stably and evenly to the liquid conduction port 4, and can also slow down the flow rate of the atomized liquid into the atomization core 22 through the liquid conduction port 4, thereby achieving good prevention. Leakage effect.

Please refer to Figure 2, Figure 3 and Figure 6 in conjunction. An embodiment of the present invention also provides an atomizer 2. The atomizer 2 includes the atomizer core 22 provided in any of the above embodiments. Since the atomizer 2 has all the technical features of the atomizer core 22 provided in any of the above embodiments, it has the same technical effects as the atomizer core 22 .

Please refer to Figure 1, Figure 5 and Figure 6 in conjunction. In some embodiments, the atomization bomb body 21 includes an atomization shell 211 provided with an air inlet 3, and an atomization shell 211 provided on the bottom opening of the atomization shell 211. The base 212 and the breather tube 213 located in the atomization housing 211. The atomization core 22 is supported on the base 212. The breather tube 213 connects the atomization core 22 and the suction port 3. The inside of the atomization housing 211 is in the atomization core. 22 and the part outside the associated breather tube 213 defines a liquid storage chamber 5. The atomizing core 22 is provided with a liquid guide port 4 connected to the liquid storage chamber 5. The porous aerogel 1 is located in the liquid storage chamber 5 and seals the guide port. Liquid port 4. When the atomizer 2 is working, the atomized liquid stored in the porous aerogel 1 is transmitted to the atomizing core 22 through the liquid guide port 4. The heat generated by the atomizing core 22 after being powered on can heat and atomize the atomized liquid to form an aerosol. , the aerosol is led to the suction port 3 through the ventilation tube 213, and the user can inhale the aerosol through the suction port 3. Furthermore, in order to facilitate the user to inhale the aerosol, the atomization housing 211 is also provided with a suction nozzle 6 connected with the suction port 3 . The suction nozzle 6 is provided with a sealing plug 7. When the atomizer 2 is not in use, the suction nozzle 6 can be closed by the sealing plug 7, thereby achieving the effect of preventing dust and liquid leakage.

An embodiment of the present invention also provides an aerosol generating device. The aerosol generating device includes the atomizing core 22 provided in any of the above embodiments or the atomizer 2 provided in any of the above embodiments. Since the aerosol generating device has all the technical features of the atomizing core 22 or the atomizer 2 provided in any of the above embodiments, it has the same technical effects as the atomizing core 22 .

Embodiments of the present invention also provide a liquid storage part preparation method that can prepare the above-mentioned liquid storage part. The liquid storage part preparation method in the embodiment of the present invention includes the following steps:

Step S01: Mix dioxane and tert-butyl alcohol solution to obtain a mixed solvent;

Step S02: Add fluorine-containing aromatic dianhydride monomer and diamine monomer to the mixed solvent, and obtain a polyamic acid solution through the ammonolysis reaction of ether;

Step S03: Add ammonium chloride particles to the polyamic acid solution and stir evenly to obtain a PAA-NH ₄ Cl suspension.

Step S04: Inject the PAA-NH ₄ Cl suspension into the mold for freezing, and obtain PAA-NH ₄ Cl aerogel through freeze-drying;

Step S05: Heat the demolded PAA-NH ₄ Cl aerogel and perform thermal imidization treatment to obtain a porous polyimide aerogel that can be used as a liquid storage member.

Compared with the prior art, the liquid storage member preparation method provided by the embodiment of the present invention uses a fluorine-containing aromatic dianhydride monomer and a diamine monomer, and mixes dioxane (Diox) and tert-butyl alcohol (TBA). The ammonolysis reaction of ether is carried out in the solvent to form a polyamic acid (PAA) solution. Ammonium chloride particles are used as pore-forming agents, and the polyamic acid (PAA) solution with added ammonium chloride particles is injected into the mold for freezing. After the PAA-NH ₄ Cl aerogel obtained by drying is thermally imidized, a porous polyimide aerogel can be prepared. The liquid storage member preparation method provided by the embodiment of the present invention can reasonably regulate the pore size of the porous polyimide aerogel according to the needs of use. The preparation process is short and the process is simple. It can not only reduce product instability caused by unstable factors It is flexible and can reduce the production cost, energy consumption and pollutant emissions of liquid storage parts. The liquid storage member preparation method provided by the embodiment of the present invention can suppress the volume shrinkage of the airgel during the thermal imidization process by introducing ammonium chloride pore-forming agent. In the liquid storage component preparation method provided by the embodiment of the present invention, an ice crystal structure is formed during the freeze-drying process, and the solvent can be removed to form a polyamic acid aerogel. The liquid storage member preparation method provided by the embodiment of the present invention completes the dehydration condensation reaction of carboxyl groups and imines through the thermal imidization process, reduces the number of lyophobic groups in the airgel, and allows ammonium chloride to be fully thermally decomposed , to achieve the purpose of removing ammonium chloride.

Specifically, in step S01, the volume proportion of the tert-butyl alcohol (TBA) solution in the mixed solvent is 0-30%. From the test data in Table 1, it can be seen that the volume proportion of tert-butyl alcohol (TBA) solution in the mixed solvent is 0 to 30%, which is helpful to create pores in the polyimide aerogel and takes into account the porous polyimide. The high specific surface area, shape integrity and structural strength of aerogels. When the volume proportion of the tert-butyl alcohol solution in the mixed solvent is greater than 30%, although the specific surface area of the porous polyimide aerogel can be increased, the structural strength of the porous polyimide aerogel is significantly reduced.

Specifically, in step S04, the freezing rate of the freeze-drying process is 5-10°C/min, and a columnar porous polyimide aerogel with complete shape and structure can be obtained. When the freezing rate of the freeze-drying process is greater than 10°C/min or less than 5°C/min, the prepared porous polyimide aerogel is prone to problems such as cracks of varying sizes and depressions in the columnar central area.

Specifically, in step S03, the particle size of the ammonium chloride particles is between 60 and 140 μm, and a PAA-NH ₄ Cl slurry with strong uniformity can be obtained. It can be seen from the test data in Table 2 that the particle size of ammonium chloride particles is between 60 and 140 μm, which is beneficial to maintaining the structural integrity of porous polyimide aerogels.

Specifically, in step S03, the mass of ammonium chloride particles added is 1 to 10 g, and a columnar porous polyimide aerogel with complete shape and structure can be obtained. Although increasing the amount of ammonium chloride added is beneficial to increasing the liquid storage capacity of porous polyimide aerogels. However, when the input amount of ammonium chloride exceeds 10g, the structural integrity and mechanical strength of the porous polyimide aerogel are easily damaged, which is not conducive to the installation of the porous polyimide aerogel in the atomizer 2 , reduce the service life of liquid storage parts. Due to the excessive input of ammonium chloride, the agglomeration of the ammonium chloride granular pore-forming agent becomes more serious, which reduces the fluidity and uniformity of the PAA-NH ₄ Cl slurry, thereby causing the structure of the porous polyimide aerogel to appear. Incomplete defects.

Specifically, in step S05, the temperature rise rate of the thermal imidization treatment is 1 to 5°C/min, which is conducive to the full dehydration and condensation reaction of carboxyl groups and imines, and reduces the formation of lyophobic groups in the porous polyimide aerogel. quantity.

Specifically, in step S05, the temperature of the thermal imidization treatment is 240-270°C, and the time of the thermal imidization treatment is 0.5-2h, so that the porous polyimide aerogel has a complete appearance shape and strong Excellent mechanical strength, excellent liquid storage performance and fast liquid absorption rate. The temperature of the thermal imidization treatment is too high or too low, resulting in insufficient thermal imidization of PAA, resulting in a decrease in the mechanical strength and liquid absorption rate of the porous polyimide aerogel.

Specifically, in step S02, the added fluorine-containing aromatic dianhydride monomer and diamine monomer are in an equal molar ratio. Under the same conditions, using an equal molar ratio of ODA/6FDA as the solute, the lower its content, the higher the liquid storage volume, which is mainly due to the difference between the liquid solvent and the solid ammonium chloride particles during the freeze-drying and thermal imidization processes. At the same time, it serves as a pore-forming agent and plays the role of pore-forming respectively, improving the porosity of the porous polyimide aerogel. However, when the equimolar ratio of ODA/6FDA is less than 10%, columnar porous polyimide aerogels are prone to structural collapse, slow lipophilicity, and brittleness. When the equal molar ratio of ODA/6FDA is greater than 20%, the pore-forming agent is relatively reduced, so the lipophilicity becomes slower and the liquid storage volume becomes lower. It can be seen that the solute content of the equal molar ratio of ODA/6FDA in the entire system should be controlled at 10 to 20%. Therefore, in step S02, the polyamic acid solution generated by the reaction accounts for 10 to 20% of the mass percentage of the fluorinated aromatic dianhydride monomer and diamine monomer.

Example 1

Add a certain amount of dioxane (Diox) and tert-butyl alcohol to a three-necked flask with mechanical stirring, mix to obtain a TBA solution, prepare a mixed solvent solution with a TBA volume fraction of 0, and then add an equal molar ratio of 4,4' - Diaminodiphenyl ether (ODA) and 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA), after the solids are completely dissolved, a 10wt% polyamic acid (PAA) solution is formed;

(2) Add 10g of ammonium chloride (NH ₄ Cl) with a particle size of 140 μm as a pore-forming agent to the prepared PAA solution, stir evenly to form a PAA-NH4Cl suspension, and add the PAA-NH ₄ Cl suspension Pour into a mold and freeze into a columnar shape (freezing rate is 7°C/min), and then freeze-dry to form PAA-NH ₄ Cl aerogel;

(3) Heat the PAA-NH ₄ Cl aerogel to 240°C at a heating rate of 5°C/min for thermal imidization treatment for 0.5h to obtain a porous polyimide aerogel sample.

The difference between Example 2, Example 3, Example 4, Example 5 and Example 1 lies in the volume fraction of the prepared TBA, and everything else is the same. Among them, in Example 2, a mixed solvent solution with a TBA volume fraction of 10% was prepared, in Example 3, a mixed solvent solution with a TBA volume fraction of 20% was prepared, and in Example 4, a mixed solvent solution with a TBA volume fraction of 30% was prepared. Solvent solution: In Example 5, a mixed solvent solution with a TBA volume fraction of 40% was prepared, and a porous ceramic sample was used as Comparative Example 1. The shapes of the samples in Examples 1 to 5 and Comparative Example 1 were respectively observed, and the structural strength and specific surface area of the samples in Examples 1 to 5 and Comparative Example 1 were tested respectively.

Table 1 Sample related performance test table of Examples 1 to 5 and Comparative Example 1

Example 6

(1) Add 47.79mL dioxane (Diox) and 20.48mL tert-butyl alcohol (TBA) solution to a three-necked flask with mechanical stirring. The volume ratio of TBA is 30%, and then add an equal molar ratio of 4, 4'-diaminodiphenyl ether (ODA) and 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA), after the solids are completely dissolved, a 10wt% polyamic acid (PAA) solution is formed;

(2) Add 10g ammonium chloride (NH ₄ Cl) with a particle size of 170 μm as a pore-forming agent to the prepared PAA solution, and stir evenly to form a PAA-NH4Cl suspension;

(3) Pour the prepared PAA-NH ₄ Cl suspension into a mold, freeze it (freezing rate is 7°C/min), and then freeze-dry for 24 hours to form PAA-NH ₄ Cl aerogel;

(4) The PAA-NH ₄ Cl aerogel was heated to 240°C at a heating rate of 5°C/min for thermal imidization treatment for 0.5h to obtain a porous polyimide (PI) aerogel sample.

The difference between Example 7, Example 8, Example 9, Example 10 and Example 6 lies in the particle size of ammonium chloride (NH ₄ Cl) added to the PAA solution, and everything else is the same. Among them, the particle size of ammonium chloride (NH ₄ Cl) added to the PAA solution in Example 7 is 140 μm, and the particle size of ammonium chloride (NH ₄ Cl) added to the PAA solution in Example 8 is 110 μm. In Example 9, the particle size of the ammonium chloride (NH ₄ Cl) added to the PAA solution was 80 μm. In Example 10, the particle size of the ammonium chloride (NH ₄ Cl) added to the PAA solution was 60 μm. Observe the shape of the samples in Examples 7 to 10 and whether the slurry is delaminated, and test the pore size and compressive strength of the samples in Examples 7 to 10 respectively.

Table 2 Sample related performance test table in Examples 7 to 10

Test items D90 particle size of NH ₄ Cl (um) Column PI integrity Is the slurry layered? Aperture (um) Mechanical strength Example 6 170 incomplete yes 100-120 weak Example 7 140 whole no 80-100 powerful Example 8 110 whole no 60-80 powerful Example 9 80 whole no 40-60 powerful Example 10 60 whole no 20-40 powerful

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (16)

1. The liquid storage piece is used for an atomizer and is characterized by comprising an atomization bullet main body and an atomization core used for atomizing atomized liquid to form aerosol, wherein the atomization core is arranged in the atomization bullet main body, a liquid storage cavity is formed in the atomization bullet main body, and the liquid storage piece is arranged in the liquid storage cavity; the liquid storage piece is porous aerogel, so that the liquid storage piece can be used for storing atomized liquid, and the liquid storage piece can transmit the stored atomized liquid to the atomization core.

2. The reservoir of claim 1, wherein the porous aerogel is a porous aerogel matrix made of polyimide.

3. The reservoir of claim 1, wherein the porous aerogel has a stock solution amount of 800-1000 mg/g.

4. A reservoir according to claim 1, wherein the porous aerogel has a pore size of 0.1 to 100 μm.

5. A reservoir according to any one of claims 1 to 4, wherein the porous aerogel is cylindrical, and wherein the porous aerogel is provided with a sleeve aperture extending axially therethrough, and wherein the atomizing core is located in the sleeve aperture.

6. The fluid storage element of claim 5, wherein the outer peripheral surface of the porous aerogel abuts against the inner side surface of the fluid storage chamber, and the walls of the sleeve holes abut against the outer peripheral surface of the atomizing core.

7. A nebulizer comprising a reservoir according to any one of claims 1 to 6.

8. The atomizer of claim 7 wherein said atomizing core comprises an atomizing support disposed in said atomizing bomb body, a heat generating body disposed in said atomizing support, and a liquid guiding member for conveying atomized liquid to said heat generating body, said liquid guiding member being disposed in said atomizing support, said atomizing support being provided with a liquid guiding port for conveying atomized liquid to said liquid guiding member, said porous aerogel shielding said liquid guiding port.

9. The atomizer of claim 7 wherein said atomizer body comprises an atomizer housing having an air inlet, a base disposed on an opening in a bottom of said atomizer housing, and a vent tube disposed in said atomizer housing, said atomizer core being supported on said base, said vent tube connecting said atomizer core with said air inlet, said atomizer housing defining said reservoir within said atomizer core and outside said vent tube, said atomizer core having a liquid port communicating with said reservoir, said porous aerogel closing said liquid port.

10. An aerosol generating device comprising a reservoir as claimed in any one of claims 1 to 5 or a nebuliser as claimed in any one of claims 6 to 9.

11. The preparation method of the liquid storage piece is characterized by comprising the following steps of:

step S01: mixing dioxane and tertiary butanol solution to obtain a mixed solvent;

step S02: adding fluorine-containing aromatic dianhydride monomer and diamine monomer into the mixed solvent, and obtaining polyamic acid solution through ammonolysis reaction of ether;

step S03: ammonium chloride particles are added into the polyamic acid solution and stirred uniformly to obtain PAA-NH ₄ Cl suspension

Step S04: the PAA-NH is processed ₄ Injecting the Cl suspension into a mold for freezing, and performing freeze drying treatment to obtain PAA-NH ₄ Cl aerogel;

step S05: the PAA-NH after demoulding ₄ Heating the Cl aerogel, and performing thermal imidization treatment to obtain the porous polyimide aerogel serving as a liquid storage part.

12. The method of preparing a reservoir according to claim 11, wherein in the step S01, the tertiary butanol solution occupies 0 to 30% of the volume specific gravity of the mixed solvent.

13. The method of preparing a reservoir according to claim 11, wherein in the step S03, the ammonium chloride particles have a particle size of 60 to 140 μm.

14. The method of producing a reservoir according to claim 11, wherein in the step S03, the ammonium chloride particles are added in an amount of 1 to 10g by mass.

15. The method of preparing a liquid storage member according to claim 11, wherein in said step S05, the thermal imidization treatment is performed at a temperature of 240 to 270 ℃ for a time of 0.5 to 2 hours.

16. The method of claim 11, wherein in the step S02, the polyamic acid solution formed by the reaction accounts for 10 to 20% by mass of the fluorine-containing aromatic dianhydride monomer and the diamine monomer.