CN220211944U - Atomizing core, atomizer and aerosol generating device - Google Patents
Atomizing core, atomizer and aerosol generating device Download PDFInfo
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- CN220211944U CN220211944U CN202321704627.6U CN202321704627U CN220211944U CN 220211944 U CN220211944 U CN 220211944U CN 202321704627 U CN202321704627 U CN 202321704627U CN 220211944 U CN220211944 U CN 220211944U
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Abstract
The utility model provides an atomization core, an atomizer and an aerosol generating device, wherein porous aerogel with temperature resistance is used as a liquid guide piece, so that the dry burning resistance of the liquid guide piece is enhanced under the condition that the liquid guide piece is in direct contact with a heating body 1, the phenomenon that the liquid guide piece is carbonized to cause a paste core is effectively prevented, the defect that the traditional liquid guide piece is difficult to have excellent temperature resistance and good liquid guide performance, and the carbonized paste core is easy to occur is overcome, and the atomization effect and the service life of the atomization core are improved. And locate the atomizing face of porous aerogel with the heat-insulating properties that porous aerogel is excellent for the heat that the heat-generating body produced is difficult for losing, makes the heat that the heat-generating body produced more abundant and concentrate carry out heating atomization to the atomized liquid, is favorable to improving heat utilization ratio, reduces the energy consumption. In addition, the heating element is embedded or attached on the atomization surface of the porous aerogel, so that the dry burning problem caused by solid-gas-solid phase between the heating element and the liquid guide piece can be solved.
Description
Technical Field
The utility model belongs to the technical field of atomization, and particularly relates to an atomization core, an atomizer and an aerosol generating device.
Background
The atomizing core used by the aerosol generating device mainly comprises a heating body and a liquid guide piece, wherein atomized liquid is transmitted to the heating body through the liquid guide piece, and the heating body heats and atomizes the atomized liquid to form aerosol after being electrified and heated. At present, the liquid guide member is generally made of porous ceramics with high temperature resistance or liquid guide cotton with excellent liquid guide performance. However, the ceramic liquid guide performance of the porous ceramic is poor, and the high temperature resistance of the liquid guide cotton is poor, so that the liquid guide piece of the atomization core is difficult to achieve both good liquid guide performance and high temperature resistance, the atomization effect of the atomization core is poor, and the service life of the atomization core and the improvement of the atomization performance are severely restricted.
Disclosure of Invention
Based on the above-mentioned problems in the prior art, one of the purposes of the embodiments of the present utility model is to provide an atomization core with both excellent temperature resistance and good liquid guiding performance, so as to solve the problem that the liquid guiding member of the atomization core in the prior art is difficult to combine the good liquid guiding performance and the high temperature resistance, resulting in that the service life and the atomization performance of the atomization core are difficult to be improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme: there is provided an atomizing core comprising:
the heating body is used for heating and atomizing the atomized liquid after being electrified; and
the liquid guide piece is used for conveying the atomized liquid to the heating element;
the liquid guide piece is porous aerogel, the porous aerogel is provided with a liquid absorption surface for absorbing atomized liquid and an atomization surface for releasing aerosol, the aerosol absorbed by the liquid absorption surface can be transmitted to the atomization surface through the porous aerogel, and the heating element is arranged on the atomization surface.
Optionally, the heating element is embedded on the atomization surface of the porous aerogel; or the heating element is attached to the atomization surface of the porous aerogel; or the heating body is a heating film or a heating layer plated on the atomization surface of the porous aerogel.
Alternatively, the porous aerogel is a porous aerogel matrix made of polyimide.
Optionally, the pore size of the porous aerogel is 0.1-100 μm.
Optionally, the liquid absorbing surface and the atomizing surface are respectively arranged on two side surfaces of the porous aerogel, which are away from each other.
Optionally, the porous aerogel has a high temperature resistance in the range of 350 to 500 ℃.
Optionally, the heating element is a net heating element, a heating wire, a heating sheet or a heating film.
Optionally, the liquid storage amount of the liquid guide piece is 900-1000 mg/g.
Based on the above-mentioned problems in the prior art, it is a second object of an embodiment of the present utility model to provide an atomizer having an atomizing core provided in any of the above-mentioned aspects.
In order to achieve the above purpose, the utility model adopts the following technical scheme: there is provided an atomizer comprising the atomizing core provided in any one of the above aspects.
Based on the above-mentioned problems existing in the prior art, it is a third object of an embodiment of the present utility model to provide an aerosol generating device having an atomizing core or atomizer provided in any of the above-mentioned aspects.
In order to achieve the above purpose, the utility model adopts the following technical scheme: there is provided an aerosol generating device comprising the atomizing core or the atomizer provided in any one of the above aspects.
Compared with the prior art, the one or more technical schemes in the embodiment of the utility model have at least one of the following beneficial effects:
according to the atomization core, the atomizer and the aerosol generating device, the porous aerogel with temperature resistance is used as the liquid guide piece, the dry burning resistance of the liquid guide piece is enhanced under the condition that the liquid guide piece is in direct contact with the heating body 1, the phenomenon that the liquid guide piece is carbonized to cause the core pasting is effectively prevented, the defect that the traditional liquid guide piece is difficult to have excellent temperature resistance and good liquid guide performance, and the core pasting is easy to carbonize is overcome, and therefore the atomization effect of the atomization core is improved, and the service life of the atomization core is prolonged. And locate the atomizing face of porous aerogel with the heat-insulating properties that porous aerogel is excellent for the heat that the heat-generating body produced is difficult for losing, makes the heat that the heat-generating body produced more abundant and concentrate carry out heating atomization to the atomized liquid, is favorable to improving heat utilization ratio, reduces the energy consumption. In addition, the heating element is embedded or attached on the atomization surface of the porous aerogel, so that the dry burning problem caused by solid-gas-solid phase between the heating element and the liquid guide piece can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an atomization core according to an embodiment of the present utility model;
FIG. 2 is another schematic perspective view of the atomizing core shown in FIG. 1;
FIG. 3 is a schematic perspective view of an atomizing core according to another embodiment of the present disclosure;
fig. 4 is a schematic perspective view of an atomization core according to another embodiment of the present utility model;
fig. 5 is a schematic cross-sectional structural view of the atomizing core shown in fig. 4.
Wherein, each reference sign in the figure:
1-a heating element; 2-a liquid guide; 3-liquid absorption level;
4-atomizing surface; 5-thimble; 6-electrode.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood 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 be 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 be indirectly connected to the other element. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a plurality of" is one or more, unless specifically defined otherwise.
In the description of the present utility model, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the mechanical connection and the electrical connection can be adopted; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the 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 appearances of the phrases "in one embodiment," "in some embodiments," or "in some embodiments" in various places throughout this specification are not all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Referring to fig. 1 to 5 together, an atomization core according to an embodiment of the present utility model will now be described. The atomizing core provided by the embodiment of the utility model is used for an atomizer, and can generate heat under the electric drive of the power supply device of the aerosol generating device, so that atomized liquid stored in the atomizer is heated and atomized to form aerosol.
Referring to fig. 1 and 2 in combination, the atomizing core provided in the embodiment of the present utility model includes a heating element 1 and a liquid guiding element 2, wherein the heating element 1 can heat and atomize an atomized liquid after being electrified, the heating element 1 can be, but is not limited to, a stainless steel heating element, a nichrome heating element, an iron-chromium-aluminum alloy heating element or a nickel-iron alloy heating element, and the heating element 1 can be, but is not limited to, a mesh heating element, a heating wire, a heating sheet or a heating film. The liquid guide part 2 is used for bearing the heating body 1 and can transmit atomized liquid to the heating body 1. Specifically, the liquid guide member 2 is porous aerogel with good temperature resistance and excellent liquid guide performance, the porous aerogel is provided with a liquid absorption surface 3 for absorbing atomized liquid and an atomization surface 4 for releasing aerosol, the aerosol absorbed by the liquid absorption surface 3 can be transmitted to the atomization surface 4 through the porous aerogel, and the heating element 1 is arranged on the atomization surface 4. Because the liquid guide part 2 is made of porous polyimide aerogel materials, the porous aerogel has the advantage of good temperature resistance, and also has a rich nano porous structure, when the pore diameter of micropores in the nano porous structure is 0.1-50 nm, the porous polyimide aerogel has good liquid locking performance, and can prevent liquid leakage; and when the pore diameter of the micropores in the nano porous structure is 50 nm-100 mu m, the porous polyimide aerogel has good liquid guide performance. In addition, the pore diameter of micropores in the nano porous structure inside the porous polyimide aerogel can be regulated and controlled between 0.1 and 100 mu m, and the regulation and control on the fineness and the taste of aerosol are easy to realize. In addition, the porous polyimide aerogel is easy to realize surface functional group modification, the range and the space of surface polarity regulation are expanded, the pore-forming agent addition amount can realize pore diameter regulation, the porosity is further controlled, the regulation dimensions of two layers of physics and chemistry of the liquid guide piece 2 are extended, the regulation of liquid guide rate and liquid storage amount is realized, and the taste optimization of a product is realized at multiple angles. In addition, the high temperature resistant range of the porous polyimide aerogel is 350-500 ℃, so that the high temperature resistant range of the liquid guide member 2 is up to 350-500 ℃, and the liquid guide member 2 has better dry burning resistance. In addition, the porous polyimide aerogel has excellent heat insulation performance, so that the dry burning resistance of the liquid guide piece 2 is enhanced, and the phenomenon that the liquid guide piece 2 is carbonized to cause a paste core is effectively prevented. In addition, the liquid guide piece 2 is in direct contact with the heating body 1, and the heat insulation performance of the porous polyimide aerogel is excellent, so that heat generated by the heating body 1 is not easy to dissipate, the heat generated by the heating body 1 is more sufficient and concentrated to heat and atomize atomized liquid, the heat utilization rate is improved, and the energy consumption is reduced.
Compared with the prior art, the atomization core provided by the embodiment of the utility model adopts the porous aerogel with temperature resistance as the liquid guide piece 2, and under the condition that the liquid guide piece 2 is in direct contact with the heating body 1, the dry burning resistance of the liquid guide piece 2 is enhanced, the phenomenon that the liquid guide piece 2 is carbonized to cause the core pasting is effectively prevented, and the defect that the traditional liquid guide piece 2 is difficult to have excellent temperature resistance and good liquid guide performance to cause the core pasting carbonization is overcome, so that the atomization effect and the service life of the atomization core are improved. And locate on the atomizing face 4 of porous aerogel with heat-generating body 1, utilize the excellent thermal-insulated heat preservation performance of porous aerogel for the heat that heat-generating body 1 produced is difficult for losing, makes the heat that heat-generating body 1 produced more abundant and concentrate carry out the heating atomizing to the atomized liquid, is favorable to improving heat utilization ratio, reduces the energy consumption. In addition, the heating element 1 is embedded or attached on the atomization surface 4 of the porous aerogel, which is beneficial to overcoming the dry heating problem caused by solid-gas-solid phase between the heating element 1 and the liquid guide piece 2.
Referring to fig. 1, fig. 2 and fig. 3 in combination, in some embodiments, the heating element 1 is embedded on the atomizing surface 4 of the porous aerogel, so as to enhance the bonding strength of the heating element 1 and the liquid guiding member 2, so that the heating element 1 is highly bonded with the liquid guiding member 2, the contact area of the heating element 1 and the liquid guiding member 2 is increased, and the dry burning problem caused by solid-gas-solid phase between the heating element 1 and the liquid guiding member 2 is overcome.
Referring to fig. 4 and fig. 5 in combination, in other embodiments, the heating element 1 is attached to the atomizing surface 4 of the porous aerogel, so that stability of the resistance value of the heating element 1 is improved, and the atomized liquid on the atomizing surface 4 of the porous aerogel can be heated and atomized by the heat generated by the heating element 1 rapidly and uniformly. In order to enhance the compactness of the heating element 1 attached to the atomizing surface 4 of the porous aerogel, the atomizing core further comprises a thimble 5 for propping the heating element 1 against the atomizing surface 4 of the porous aerogel, and the thimble 5 can be a conductive metal column or a conductive metal spring needle.
Referring to fig. 4 and fig. 5 in combination, in other embodiments, the heating element 1 is a heating film or a heating layer plated or deposited on the atomizing surface 4 of the porous aerogel, so that the heating element 1 is highly attached to the liquid guiding member 2, the contact area between the heating element 1 and the liquid guiding member 2 is increased, the stability of the resistance value of the heating element 1 is improved, and the atomized liquid on the atomizing surface 4 of the porous aerogel can be heated and atomized by the heat generated by the heating element 1 rapidly and uniformly. The heating film or the heating layer is provided with two electrodes 6, and the heating film or the heating layer can be respectively electrically connected with the positive electrode and the negative electrode of the external power supply device through the two electrodes 6, so that the external power supply device can supply power to the heating film or the heating layer.
In some embodiments, the porous aerogel is a porous aerogel matrix made of polyimide, the pore diameter of the porous aerogel matrix is 0.1-100 μm, the liquid absorbing surface 3 and the atomizing surface 4 are respectively arranged on two opposite side surfaces of the porous aerogel matrix, the high temperature resistant range of the porous aerogel matrix is 350-500 ℃, and the liquid storage capacity of the porous aerogel matrix is 900-1000 mg/g, so that the liquid guide member 2 has better dry burning resistance. In addition, the porous aerogel matrix has excellent temperature resistance and good liquid guide performance, and can solve the problems that the ceramic atomizing core is poor in liquid guide performance, easy to carbonize, small in aerosol generation amount and the like.
The embodiment of the utility model also provides an atomizer, which comprises the atomizing core provided by any embodiment. The atomizer has the same technical effects as the atomization core because the atomizer has all the technical characteristics of the atomization core provided by any one of the embodiments.
The embodiment of the utility model also provides an aerosol generating device, which comprises the atomization core provided by any embodiment or the atomizer provided by any embodiment. The aerosol generating device has the same technical effects as the atomizing core because the aerosol generating device has all the technical characteristics of the atomizing core or the atomizer provided by any one of the embodiments.
The embodiment of the utility model also provides a preparation method of the atomization core, which can prepare the atomization core, and the preparation method of the atomization core in the embodiment of the utility model comprises the following steps:
step S01: mixing the polyamic acid mixture with ammonium chloride particles, and stirring to obtain PAA-NH 4 Cl slurry;
step S02: fixing the heating element 1 in a mold, and injecting PAA-NH into the mold 4 Performing high-temperature solidification treatment on the Cl slurry, cooling and demolding to obtain a solidified and molded atomized core blank;
step S03: and placing the atomized core blank body into deionized water, and carrying out soaking and dissolving ammonium chloride treatment to obtain an atomized core finished product.
Compared with the prior art, the preparation method of the atomization core provided by the embodiment of the utility model only needs to mix the polyamic acid mixture with the ammonium chloride particles to obtain the PAA-NH 4 Cl slurry, PAA-NH 4 Injecting Cl slurry into a die preset with a heating body 1 for high-temperature solidification treatment, then soaking the cooled and demoulded atomized core blank body by ionized water, and passingThe ammonium chloride pore-forming agent is dissolved and removed by a water dissolution method, so that the porous polyimide aerogel which has excellent temperature resistance and good liquid guide performance and is loaded with the heating element 1 is prepared, and the atomized core finished product is obtained. The preparation method of the atomizing core provided by the embodiment of the utility model 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 products caused by unstable factors, can reduce the manufacturing cost and energy consumption of the atomizing core, and is environment-friendly.
Specifically, in step S01, the mass ratio of the polyamic acid mixture to the ammonium chloride particles is 1: (3-5). The proportion of the ammonium chloride particles can directly control the porosity of the porous polyimide aerogel, and the higher the proportion of the ammonium chloride particles is, the higher the porosity is, the faster the liquid guide rate is, and the larger the liquid storage amount is. From the test data in Table 2, it can be seen that when the ratio of polyamic acid mixture (PAA) to ammonium chloride particles is less than 1:5, the compressive strength of the porous polyimide aerogel decreases sharply, which is insufficient for use in the atomizing core. When the ratio of the polyamic acid mixture (PAA) to the ammonium chloride particles is greater than 1:3, the porosity of the porous polyimide aerogel decreases drastically and the atomized mouthfeel obtained when applied in the atomized core is poor. Since the porous polyimide aerogel has higher porosity and lower density with the same volume, the porous polyimide aerogel has lower mass, and the exposed lipophilic surface functional groups are fewer, so that the liquid conductivity is weaker. When the porosity of the porous polyimide aerogel is 65% -76%, the liquid guiding rate of the porous polyimide aerogel is higher, and the atomized taste obtained by applying the porous polyimide aerogel in the atomized core is better. Therefore, the porous polyimide aerogel has a porosity of 65-76% and is suitable for being applied to an atomization core as the liquid guide 2.
Specifically, in step S01, the particle size of the ammonium chloride particles is 80 to 140. Mu.m. Due to the size of the ammonium chloride particles, the aperture and the porosity of the porous polyimide aerogel are decisively controlled, and as the size of the ammonium chloride particles is increased, the aperture and the porosity of the porous polyimide aerogel are also larger, but the compressive strength of the porous polyimide aerogel is smaller. From the test data in table 2, it is clear that when the particle size of the ammonium chloride particles is smaller than 80 μm, the porous polyimide aerogel has a significantly reduced porosity and pore size, although the compressive strength and liquid guiding rate of the porous polyimide aerogel are higher, and is unsuitable for use as the liquid guiding member 2 in the atomizing core. When the particle diameter of the ammonium chloride particles is larger than 140 μm, the pore diameter and the porosity of the porous polyimide aerogel are larger, but the compressive strength of the porous polyimide aerogel is too small to be suitable for being applied to an atomization core as a liquid guide member 2. Therefore, in order to achieve both the compressive strength and the porosity of the porous polyimide aerogel, the particle size of the ammonium chloride particles is 80-140 μm.
Specifically, in step S02, the temperature of the high-temperature curing treatment is 60 to 260 ℃, and the time of the high-temperature curing treatment is 2 to 2.5 hours, so that. As the prepared porous polyimide aerogel is a blocky matrix, PAA-NH is loaded by three different heating temperature ranges 4 The heating element 1 of the Cl paste was subjected to high-temperature curing treatment. A first stage; PAA-NH in a mold 4 Transferring the Cl slurry into a high-temperature curing furnace for preheating treatment, wherein the temperature of the preheating treatment is 60-100 ℃, and the preheating treatment time is 20-40 min, thereby being beneficial to removing PAA-NH 4 A large number of solute molecules in the Cl slurry and form slit holes, and simultaneously, PAA-NH is processed 4 The Cl slurry is preheated to avoid the non-uniformity of the heat treatment in the next stage. A second stage; performing thermal imidization on the PAA-NH4Cl slurry after the preheating treatment to obtain polyimide aerogel embedded with a heating body 1, wherein the temperature of the thermal imidization is 120-180 ℃ and the time of the thermal imidization is 40-70 min, so that the PAA-NH 4 The Cl slurry can be sufficiently and efficiently subjected to dehydration condensation, and thus can be sufficiently, uniformly and efficiently converted into PI. A third stage; and (3) carrying out high Wen Yunhua treatment on the polyimide aerogel subjected to high-temperature dehydration treatment, wherein the temperature of the high Wen Yunhua treatment is 200-260 ℃, the time of the high Wen Yunhua treatment is 20-40 min, and further carrying out thermal imidization on PAA which is not converted into PI in the polyimide aerogel.
Example 1
(1) Polyamic acid mixture is added into a three-neck flask with mechanical stirringMixing the compound with ammonium chloride particles, and stirring uniformly to obtain PAA-NH 4 Cl slurry. Wherein, the mass ratio of the added polyamide acid mixture to the ammonium chloride particles is 1:1, the grain diameter of the ammonium chloride particles is 140um;
(2) Fixing the heating element 1 in a mold, and injecting PAA-NH into the mold 4 Performing high-temperature solidification treatment on the Cl slurry, cooling and demolding to obtain a solidified and molded atomized core blank;
(3) And placing the atomized core blank body into deionized water, and carrying out soaking and dissolving ammonium chloride treatment to obtain an atomized core finished product.
Examples 2, 3, 4, 5, 6, 7, 8 and 1 differ in the mass ratio of the polyamic acid mixture to the ammonium chloride particles added, and the others are the same. Wherein the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 2 is 1:2, the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 3 was 1:3 the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 4 was 1:4 the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 5 was 1:5, the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 6 was 1:6, the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 7 was 1:7, the mass ratio of the polyamic acid mixture to the ammonium chloride particles added in example 8 was 1:8, and a porous ceramic sample was used as comparative example 1. Samples of examples 1 to 5 and comparative example 1 were tested for porosity, compressive strength, liquid transfer rate and loading into a nebulizer for evaluation of the nebulized mouthfeel, respectively. Wherein, in the evaluation of the hazy mouthfeel, the lower the value is indicative of worse hazy mouthfeel, and the higher the value is indicative of better hazy mouthfeel.
Table 1 sample-related Performance test Table in examples 1 to 8 and comparative example 1
Example 4
(1) Adding the polyamic acid mixture and ammonium chloride particles into a three-neck flask with mechanical stirring, and uniformly stirring to obtain PAA-NH 4 Cl slurry. Wherein, the mass ratio of the added polyamide acid mixture to the ammonium chloride particles is 1:4, the grain diameter of the ammonium chloride particles is 140um;
(2) Fixing the heating element 1 in a mold, and injecting PAA-NH into the mold 4 Performing high-temperature solidification treatment on the Cl slurry, cooling and demolding to obtain a solidified and molded atomized core blank;
(3) And placing the atomized core blank body into deionized water, and carrying out soaking and dissolving ammonium chloride treatment to obtain an atomized core finished product.
Examples 9, 10, 11, 12, 13, and 14 differ from example 4 in that the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) is different and the other are the same. Wherein the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) in example 9 was 50um, the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) in example 10 was 80um, the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) in example 11 was 110um, the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) in example 12 was 170um, the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) in example 13 was 200um, and the particle size of ammonium chloride particles added to the prepared polyamic acid mixture (PAA) in example 14 was 240um, and a porous ceramic sample was used as comparative example 1. Samples of examples 1 to 5 and comparative example 1 were tested for porosity, compressive strength, liquid transfer rate and loading into a nebulizer for evaluation of the nebulized mouthfeel, respectively. Wherein, in the evaluation of the hazy mouthfeel, the lower the value is indicative of worse hazy mouthfeel, and the higher the value is indicative of better hazy mouthfeel.
Table 2 sample-related Performance test Table in example 4, examples 9 to 14 and comparative example 1
According to the preparation method of the atomization core, the preparation temperature is 60-260 ℃, the porous polyimide aerogel is easy to realize surface functional group modification, surface lipophilic groups can be greatly reserved, the range and space of surface polarity regulation are expanded, the porous ceramic generally needs to be calcined at a high temperature of 700-1400 ℃, and at such temperature, the surface functional groups which are favorable for atomized liquid transmission are hardly present. In addition, according to the preparation method of the atomizing core provided by the embodiment of the utility model, the pore diameter of the porous polyimide aerogel can be regulated and controlled by changing the addition amount of the pore-forming agent ammonium chloride particles, so that the porosity of the porous polyimide aerogel is controlled, the regulating and controlling dimensions of two layers of liquid storage cotton are extended, the regulation of liquid guide rate and liquid storage amount is realized, and the taste optimization of a product is realized at multiple angles. The porous polyimide aerogel has rich surface functional groups, metal ions are separated out in the process of contacting the metal heating body with the atomized liquid, and the functional groups with rich surfaces can effectively capture the metal ions, so that the release of the heavy metal ions in the aerosol is reduced. In addition, the porous polyimide aerogel prepared by the preparation method of the atomizing core provided by the embodiment of the utility model not only has the advantage of good temperature resistance, but also has a rich nano porous structure, and when the pore diameter of micropores in the nano porous structure is 0.1-50 nm, the porous polyimide aerogel has good liquid locking performance and can prevent liquid leakage; and when the pore diameter of the micropores in the nano porous structure is 50 nm-100 mu m, the porous polyimide aerogel has good liquid guide performance. In addition, the pore diameter of micropores in the nano porous structure inside the porous polyimide aerogel can be regulated and controlled between 0.1 and 100 mu m, and the regulation and control on the fineness and the taste of aerosol are easy to realize. Firstly, compared with the traditional porous ceramic preparation, the porous ceramic preparation mainly relates to an organic solid pore-forming agent or an inorganic solid pore-forming agent, and the general form of the pore-forming agent is granular, so that blind holes are inevitably formed, the blind holes are not beneficial to the transmission of atomized liquid, and the porous ceramic preparation is also a waste of space volume. Meanwhile, pore formers used for preparing the porous ceramics generally have pore diameters of 15-50 microns, belong to a large pore range, and are difficult to exist in micropores with the pore diameters of less than or equal to 2nm and mesopores with the pore diameters of 2-50 nm. In addition, the PAA can undergo dehydration condensation reaction in the thermal imidization process, namely, when the PAA becomes PI, the PAA can produce a water vapor molecule out of a system, thereby being beneficial to forming micropores and mesopores. Therefore, the porous polyimide aerogel prepared by the preparation method of the atomizing core provided by the embodiment of the utility model can have micropores, mesopores and macropores with the pore diameter of more than 50 nm. Wherein, the macropores are mainly formed by pore formation of an ammonium chloride solid phase pore-forming agent, the macropores are favorable for transmission of atomized liquid, the micropores and the mesopores are mainly formed by pore formation of a liquid phase pore-forming agent, the micropores and the mesopores are favorable for storage of the atomized liquid, and oil leakage is relieved. Therefore, the regulation and control of the aperture and the porosity of the porous polyimide aerogel can be realized by changing the particle size and the dosage of the ammonium chloride solid pore-forming agent, and further the dynamic balance of the transmission and the storage of the atomized liquid is realized. Finally, the traditional porous ceramic is mainly characterized in that ceramic aggregate and a solid phase pore-forming agent are bonded by using a binder such as glass powder, and in the high-temperature sintering process, the solid phase pore-forming agent in a particle stacking shape is heated and decomposed, and finally a 3D hole pattern in a particle stacking shape is left. Therefore, the preparation method of the atomization core provided by the embodiment of the utility model not only can form particle stacking type holes, but also can form slit holes by means of pore-forming agents in liquid phase at slits among particles of the pore-forming agents in solid phase, and is different from the hole type of the traditional porous ceramic.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. An atomizing core, comprising:
the heating body is used for heating and atomizing the atomized liquid after being electrified; and
the liquid guide piece is used for conveying the atomized liquid to the heating element;
the liquid guide piece is porous aerogel, the porous aerogel is provided with a liquid absorption surface for absorbing atomized liquid and an atomization surface for releasing aerosol, the aerosol absorbed by the liquid absorption surface can be transmitted to the atomization surface through the porous aerogel, and the heating element is arranged on the atomization surface.
2. The atomizing core of claim 1, wherein the heater is embedded in the atomizing face of the porous aerogel; or the heating element is attached to the atomization surface of the porous aerogel; or the heating body is a heating film or a heating layer plated on the atomization surface of the porous aerogel.
3. The atomizing core of claim 1, wherein the porous aerogel is a porous aerogel matrix made from polyimide.
4. The atomizing core of claim 1, wherein the porous aerogel has a pore size of 0.1 to 100 μm.
5. The atomizing core of claim 1, wherein the liquid absorbing surface and the atomizing surface are disposed on opposite side surfaces of the porous aerogel.
6. The atomizing core of claim 1, wherein the porous aerogel has a high temperature resistance in the range of 350 ℃ to 500 ℃.
7. The atomizing core of claim 1, wherein the heater is a mesh heater, heater sheet, or heater film.
8. An atomising wick according to any one of claims 1 to 7 wherein the liquid storage volume of the liquid guide is 900 to 1000mg/g.
9. An atomizer comprising an atomizing core as claimed in any one of claims 1 to 8.
10. An aerosol generating device comprising an atomizing core according to any one of claims 1 to 8 or an atomizer according to claim 9.
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