Oleophylic coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of aerosol generation, in particular to an oleophylic coating and a preparation method and application thereof.The preparation method of the oleophylic coating comprises the steps that a high-temperature-resistant resin matrix is dissolved in a solvent according to the proportion, an oleophylic functional monomer, a nanometer reinforcing material and a coupling agent are added and evenly dispersed, and homogeneous coating liquid is obtained; coating at least one surface of a substrate with the coating liquid to form a wet film; and performing stepped curing on the substrate coated with the wet film to form an oleophylic coating on the substrate. A homogeneous coating liquid prepared from a high-temperature-resistant resin matrix, an oleophylic functional monomer, a nano reinforcing material and a coupling agent is coated on a base material and is subjected to stepped curing to obtain the oleophylic coating, and the oleophylic coating has better high-temperature resistance, lipophilicity and stronger adhesive force and is suitable for working in a high-temperature environment; moreover, the influence of hydrocarbon grease on internal parts of the aerosol generating device can be avoided, and the technical problem of failure of a heating tube of the aerosol generating device can be effectively solved.

Description

Technical Field

[0001] This application relates to the field of aerosol generation technology, and more specifically to an oleophilic coating, its preparation method, and its application. Background Technology

[0002] Aerosol generating devices typically heat aerosol products at temperatures insufficient for combustion (around 300°C) to produce the aerosols required by the user. However, this aerosol can flow back into the aerosol generating device during the suction gap and condense and adhere to the pads of the heating element after the temperature drops within the heating component. This can cause the heating element to fail and affect the user experience. Summary of the Invention

[0003] This application provides an oleophilic coating, its preparation method, and its application, which can solve the technical problem of heating tube failure in aerosol generating devices.

[0004] To achieve the above-mentioned technical objectives, this application provides a method for preparing an oleophilic coating, comprising:

[0005] According to the formula, the high-temperature resistant resin matrix is ​​dissolved in the solvent, and the oleophilic functional monomer, nano-reinforcing material and coupling agent are added and dispersed evenly to obtain a homogeneous coating liquid.

[0006] The coating liquid is applied to at least one surface of a substrate to form a wet film;

[0007] The substrate coated with the wet film is subjected to step curing to form an oleophilic coating on the substrate.

[0008] In some optional embodiments, the mass fraction ratio of the high-temperature resistant resin matrix, the oleophilic functional monomer, the nano-reinforcing material, and the coupling agent ranges from 50-70:10-20:5-10:3-5.

[0009] In some alternative embodiments, step curing of the substrate coated with the wet film to form an oleophilic coating on the substrate includes:

[0010] The substrate coated with the wet film is pre-cured at a first temperature for a first preset time;

[0011] The substrate coated with the pre-cured wet film is heat-treated at a second temperature for a second preset time.

[0012] The substrate coated with the wet film, which has undergone heat treatment, is cured at a third temperature for a third preset time to form the oleophilic coating.

[0013] In some alternative embodiments, the substrate coated with the wet film is subjected to step curing to satisfy at least one of the following conditions (1)-(6):

[0014] (1) The range of the first temperature is 70℃-90℃;

[0015] (2) The value range of the first preset time is 40min-80min;

[0016] (3) The range of the second temperature is 180℃-220℃;

[0017] (4) The value range of the second preset time is 1.5h-2.5h;

[0018] (5) The value range of the third temperature is 260℃-300℃;

[0019] (6) The value range of the third preset time is 40min-80min.

[0020] In some optional embodiments, the preparation method further includes pretreating the substrate before coating the coating liquid onto at least one surface of the substrate to form a wet film, so that the surface roughness of the substrate reaches a preset value and active oxygen-containing groups are generated on the surface of the substrate.

[0021] In some optional embodiments, pretreatment of the substrate includes:

[0022] The surface of the substrate to be coated with the coating liquid is sandblasted to make the surface roughness of the substrate reach the preset value;

[0023] The substrate, after being sandblasted, is placed in an oxygen atmosphere for plasma activation treatment to generate active oxygen-containing groups on the surface of the substrate.

[0024] In some optional embodiments, the preset value of the surface roughness ranges from 1.2 μm to 1.8 μm.

[0025] In some optional embodiments, the preparation method satisfies at least one of the following conditions (1)-(9):

[0026] (1) The high-temperature resistant resin matrix includes fluorinated polyimide or fluorinated epoxy resin;

[0027] (2) The solvent includes N-methylpyrrolidone;

[0028] (3) The lipophilic functional monomers include perfluoroalkyl acrylates;

[0029] (4) The nano-reinforcing material includes carbon nanotubes;

[0030] (5) The coupling agent includes silane;

[0031] (6) The thickness of the oleophilic coating is 15μm-25μm;

[0032] (7) The thickness of the wet film is 45μm-55μm;

[0033] (8) The solid content of the coating liquid is 20%-40%;

[0034] (9) Dissolve the high-temperature resistant resin matrix in the solvent according to the ratio, and add the oleophilic functional monomer, nano-reinforcing material and coupling agent to disperse evenly to obtain a homogeneous coating liquid, including dispersion by ultrasound, with the ultrasound time being 1.5h-2.5h.

[0035] This application provides an oleophilic coating, which is prepared by the method described above.

[0036] This application provides a heating component, including a substrate and an oleophilic coating prepared by the preparation method described above or an oleophilic coating prepared by the preparation method described above, wherein the oleophilic coating is located on the side of the substrate that is in contact with the aerosol.

[0037] In some alternative embodiments, the heating assembly includes:

[0038] Support sleeve; and

[0039] A heating element is disposed inside the support sleeve, and an airflow channel is formed between the support sleeve and the heating element. The heating element has a heating cavity for containing the aerosol-generated product, and the heating cavity is connected to the airflow channel.

[0040] The portion of the support sleeve that forms the airflow channel is made of the substrate, and the substrate is provided with the oleophilic coating.

[0041] This application also provides an aerosol generating apparatus, including the heating component described above.

[0042] According to the oleophilic coating, its preparation method, and its application in this embodiment, the oleophilic coating is obtained by applying a homogeneous coating liquid prepared from a high-temperature resistant resin matrix, oleophilic functional monomers, nano-reinforcing materials, and coupling agents onto a substrate and then curing it in stages. This oleophilic coating has good high-temperature resistance, oleophilicity, and strong adhesion, making it suitable for operation in high-temperature environments. It can also avoid the influence of hydrocarbon oils on the internal components of the aerosol generating device, effectively solving the technical problem of heating element failure in the aerosol generating device. Attached Figure Description

[0043] Figure 1 This is a schematic flowchart of a method for preparing an oleophilic coating in one embodiment;

[0044] Figure 2 for Figure 1 A flowchart illustrating step S103;

[0045] Figure 3 This is a schematic flowchart of a method for preparing an oleophilic coating in another embodiment;

[0046] Figure 4 This is a structural cross-sectional view of the aerosol generating device in use in one embodiment;

[0047] Figure 5 This is a cross-sectional view of the heating assembly in one embodiment;

[0048] Figure 6 This is a schematic diagram of the support sleeve in one embodiment.

[0049] Among them: 1. Aerosol generating device;

[0050] 10. Housing assembly;

[0051] 20. Power supply components; 21. Battery; 22. Circuit board; 23. Airflow sensor;

[0052] 30. Heating component; 31. Support sleeve; 32. Heating element; 321. Heating chamber; 322. Inlet / outlet; 33. Base; 331. Base body; 332. Insertion part; 333. First cavity; 334. Second cavity; 335. Induction cavity; 34. Conductive part; 35. Airflow channel; 36. Heat exchanger; 361. Heat exchange hole; 37. Airflow gap; 38. Elastic element.

[0053] 40. Coating;

[0054] A. Aerosol-generated products. Detailed Implementation

[0055] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0056] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0057] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0058] Please see Figures 1 to 3 This application provides a method for preparing an oleophilic coating 40, the steps of which include:

[0059] S101: Dissolve the high-temperature resistant resin matrix in the solvent according to the formula, and add the oleophilic functional monomer, nano-reinforcing material and coupling agent to disperse evenly to obtain a homogeneous coating liquid;

[0060] S102: Apply the coating liquid to at least one surface of the substrate to form a wet film;

[0061] S103: Step curing is performed on a substrate coated with a wet film to form an oleophilic coating 40 on the substrate.

[0062] The high-temperature resistant resin matrix has a thermal decomposition temperature greater than 300℃, providing a high-temperature resistant framework. This allows the matrix with the oleophilic coating 40 to exhibit good high-temperature resistance, meeting the requirements for operation in high-temperature environments. The oleophilic functional monomer has a contact angle of less than 30° with hydrocarbons (oils), enhancing the oleophilicity of the coating 40. Nano-reinforcing materials improve the mechanical strength and thermal conductivity of the bulk layer, preventing localized high temperatures from causing coating 40 failure. The coupling agent enhances the interfacial adhesion between coating 40 and the substrate, effectively preventing coating 40 from detaching from the substrate and causing functional failure.

[0063] In some embodiments, the high-temperature resistant resin matrix, oleophilic functional monomer, nano-reinforcing material, and coupling agent dissolved in a solvent are ultrasonically dispersed for 1.5-2.5 hours. For example, ultrasonic dispersion for 2 hours is used to obtain a homogeneous coating solution.

[0064] In some embodiments, the mass fraction ratio of the high-temperature resistant resin matrix, the oleophilic functional monomer, the nano-reinforcing material, and the coupling agent ranges from 50-70:10-20:5-10:3-5. Specifically, the mass fraction ratio of the high-temperature resistant resin matrix, the oleophilic functional monomer, the nano-reinforcing material, and the coupling agent can be 50:10:5:3, 60:15:8:4, or 70:20:10:5.

[0065] In some embodiments, step curing of a substrate coated with a wet film to form an oleophilic coating 40 on the substrate includes:

[0066] S1031: Pre-curing a substrate coated with a wet film at a first temperature for a first preset time;

[0067] S1032: Heat-treat the pre-cured substrate coated with a wet film at a second temperature for a second preset time;

[0068] S1033: The substrate coated with a wet film after heat treatment is cured at a third temperature for a third preset time to form an oleophilic coating 40.

[0069] The core of stepped curing lies in gradually increasing the temperature to cure a wet film with a certain degree of fluidity, thereby optimizing the crosslinking reaction and microstructure of the material and ultimately improving the performance of coating 40. The specific process involves first using low-temperature curing to control the reaction rate of each component in the wet film, allowing the solvent to evaporate slowly and other components to crosslink, thus reducing bubbles or internal stress during the reaction process. In the low-temperature curing stage, preliminary crosslinking forms a loose mesh. After high-temperature heat treatment, the density and strength of the mesh are increased to form a high-strength, porous mesh structure. The final high-temperature curing further promotes the imidization of coating 40, resulting in a final thermal decomposition temperature >300℃ for coating 40. It also allows the fluorocarbon groups to align in a low contact angle (<30°).

[0070] In some embodiments, the first temperature for step curing the substrate coated with the wet film is in the range of 70°C to 90°C. Specifically, the first temperature can be 70°C, 75°C, 80°C, 85°C, or 90°C, or any value between any two of the above.

[0071] In some embodiments, the first preset time for step curing the substrate coated with a wet film ranges from 40 min to 80 min. Specifically, the first preset time can be 40 min, 50 min, 60 min (1 h), 70 min, or 80 min, or any value between any two of the above.

[0072] In some embodiments, the second temperature for step curing the substrate coated with the wet film is in the range of 180°C-220°C. Specifically, the second temperature can be 180°C, 185°C, 190°C, 195°C, 200°C, 205°C, 210°C, 215°C, or 220°C, or any value between any two of the above.

[0073] In some embodiments, the second preset time for step curing the substrate coated with the wet film ranges from 1.5h to 2.5h. Specifically, the second preset time can be 1.5h, 2h, or 2.5h, or any value between the two values ​​mentioned above.

[0074] In some embodiments, the third temperature for step curing the substrate coated with a wet film is in the range of 260°C to 300°C. Specifically, the third temperature can be 260°C, 265°C, 270°C, 275°C, 280°C, 285°C, 290°C, 295°C, or 300°C, or any value between any two of the above.

[0075] In some embodiments, the third preset time for step curing the substrate coated with the wet film is in the range of 40 min to 80 min. Specifically, the third preset time can be 40 min, 50 min, 60 min (1 h), 70 min, or 80 min, or any value between any two of the above.

[0076] Please see Figure 3 In some embodiments, the preparation method further includes pretreating the substrate before coating the coating liquid onto at least one surface of the substrate to form a wet film, so that the surface roughness of the substrate reaches a preset value and active oxygen-containing groups are generated on the substrate surface. This can also be understood as the preparation method including:

[0077] S201: Dissolve the high-temperature resistant resin matrix in the solvent according to the formula, and add the oleophilic functional monomer, nano-reinforcing material and coupling agent to disperse evenly to obtain a homogeneous coating liquid;

[0078] S202: Pre-treat the substrate to make the surface roughness of the substrate reach a preset value and generate active oxygen-containing groups on the substrate surface;

[0079] S203: Applying a coating liquid to at least one surface of a substrate to form a wet film;

[0080] S204: Step curing of a substrate coated with a wet film to form an oleophilic coating 40 on the substrate.

[0081] The core of pretreatment of the substrate is to roughen the surface of the substrate in order to increase its surface area, and to perform an active treatment on its surface to increase the surface energy of the substrate. By increasing the surface area and surface energy, the adhesion between the coating 40 and the substrate is improved.

[0082] In some embodiments, the process of pretreating the substrate includes:

[0083] The surface of the substrate to be coated with the coating liquid is sandblasted to make the surface roughness of the substrate reach the preset value.

[0084] The substrate after sandblasting is placed in an oxygen atmosphere for plasma activation treatment to generate active oxygen-containing groups on the substrate surface. The active oxygen-containing groups can be -OH, -COOH, etc. These active oxygen-containing groups can form covalent bonds with the components in the coating 40, thereby effectively improving the adhesion of the coating 40.

[0085] The specific process of plasma activation treatment of the substrate in an oxygen atmosphere is as follows: the substrate is treated with a radio frequency power of 40W-60W for 8-15 minutes. Specifically, the radio frequency power can be 40W, 50W, or 60W, or any value between these two. The treatment time can be 8 minutes, 10 minutes, 12 minutes, or 15 minutes, or any value between these two.

[0086] Of course, in other embodiments, the surface area of ​​the substrate can be increased by creating grooves on the substrate surface through physical treatment or chemical etching.

[0087] In some embodiments, the preset value of the substrate surface roughness ranges from 1.2 μm to 1.8 μm. Specifically, the preset value of the substrate surface roughness can be 1.2 μm, 1.25 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, or 1.8 μm, or any value between any two of the above.

[0088] In some embodiments, the high-temperature resistant resin matrix includes fluorinated polyimide (FPI) or fluorinated epoxy resin. The fluorocarbon chains in the high-temperature resistant resin matrix can reduce the surface energy of the coating 40, enhance the oleophilic effect on hydrocarbon oils (e-liquid), and make the contact angle of the coating 40 surface with hydrocarbon oils (e-liquid) <30°, effectively improving the oleophilicity of the coating 40.

[0089] In some embodiments, the solvent includes N-methylpyrrolidone (NMP), which is effective in dissolving compounds such as resins, especially fluorinated polyimide (FPI) with a solubility parameter (HSPδ = 23.1 MPa). 1 / 2 The optimal matching ensures that all components of coating 40 are evenly dispersed, effectively guaranteeing the uniformity and consistency of coating 40. Furthermore, the high boiling point (202℃) of N-methylpyrrolidone (NMP) is well-suited to the stepped curing process, preventing rapid evaporation that could lead to bubbles and internal stress.

[0090] In some embodiments, the oleophilic functional monomer includes perfluoroalkyl acrylates. The long-chain fluorocarbon groups (such as -C8F17) of the perfluoroalkyl acrylates can migrate to the surface of coating 40 during the curing process, reducing the surface energy of coating 40 to 10mN / m-15mN / m, effectively ensuring its oleophilic effect. Furthermore, the contact angle of the long-chain fluorocarbon groups with hydrocarbon oils (such as e-liquid) is <30°, exhibiting good oleophilicity.

[0091] In some embodiments, the nano-reinforcing material includes carbon nanotubes. Hydroxylated carbon nanotubes can effectively improve the mechanical strength and thermal conductivity of the coating 40, prevent localized high temperatures from causing the coating 40 to fail, and also improve the stability of the coating 40 under the scouring of aerosol condensate.

[0092] In some embodiments, the coupling agent includes silane KH-550, which, after hydrolysis of the siloxane end, bonds to -OH groups on the substrate surface (e.g., the -OH density of PEEK increases tenfold after plasma activation), and the amino end (-NH2) reacts with the anhydride group of fluorinated polyimide (FPI) to form chemical bonds, thereby effectively improving the interface strength and reducing the possibility of coating 40 peeling off.

[0093] In some embodiments, the thickness of the oleophilic coating 40 is 15μm-25μm, that is, the thickness of the coating 40 after the coating liquid has cured is 15μm-25μm. Specifically, the thickness of the oleophilic coating 40 is 15μm, 18μm, 20μm, 22μm or 25μm, or any value between any two of the above.

[0094] In some embodiments, the thickness of the wet film is 45 μm-55 μm, which can be understood as the coating thickness being 45 μm-55 μm when the coating liquid is applied. Specifically, the coating thickness is 45 μm, 47 μm, 50 μm, or 55 μm, or any value between any two of the above.

[0095] In some embodiments, the solid content of the coating solution is 20%-40%, which can also be understood as the mixture of high-temperature resistant resin matrix, oleophilic functional monomer, nano-reinforcing material, and coupling agent accounting for 20%-40% of the total mass of the coating solution, with the remainder being the solvent content. Specifically, the solid content of the coating solution can be 20%, 25%, 30%, 35%, or 40%, or any value between two of the above. The solid content design of the coating solution can effectively ensure that the coating solution has good viscosity for easy molding, and also good fluidity for uniform coating on the substrate.

[0096] The embodiments of this application also provide an oleophilic coating 40, which is prepared by the above-described preparation method. The oleophilic coating 40 can be used in any application where hydrocarbon oils need to be adsorbed to reduce their impact, or in applications where self-cleaning can be achieved using oleophilicity. For example, the oleophilic coating 40 can be applied to the aerosol generating device 1 to reduce damage to its internal components by aerosols, thereby effectively ensuring the functionality of the aerosol generating device 1 and effectively extending its service life.

[0097] Please see Figures 4 to 6 This application provides an aerosol generating device 11, which is an apparatus for heating an aerosol generating product A to generate aerosol using the principle of heating without combustion. The aerosol generating device 11 includes a power supply component 20 and a heating component 30. The power supply component 20 supplies power to the heating component 30, so that the heating component 30 can generate heat when energized, so as to heat the aerosol generating product A according to the heating curve (heating temperature of 250℃-350℃).

[0098] It should be noted that the term "aerosol" as used in this article can generally refer to substances that have been vaporized, atomized, sprayed or jetted, or otherwise transformed from solid or liquid form into an inhalable form containing suspended solid or liquid drug particles.

[0099] Aerosol-generating article A typically comprises, along its axis, a suction section, an airflow section, a matrix section, and a sealing section. The matrix section contains a matrix capable of generating aerosols, which is any suitable compound or mixture of compounds that facilitates aerosol formation during use, including but not limited to: polyols such as triethylene glycol, 1,3-butanediol, and glycerol; esters of polyols such as mono-, di-, or triacetic acid esters of glycerol; and aliphatic esters of mono-, di-, or polycarboxylic acids such as dimethyl dodecanoate and dimethyl tetradecanoate. Nicotine may also be included. Alternatively, glycerol (also known as glycerol) with a higher boiling point than nicotine may be included. Propylene glycol or plant-based materials may also be included. The suction section provides aerosol access to the user and also reduces the aerosol temperature to prevent burns. The airflow section guides the aerosol from the matrix section to the suction section. The sealing section prevents the passage of liquids and gases to avoid leakage of substances within the matrix section. Aerosol generating article A typically uses molded paper to form a single structure comprising a suction section, an airflow section, a matrix section, and a sealing section. Aerosol generating article A is cylindrical (including near-cylindrical) in shape. In some embodiments, the sealing section may be omitted; for example, when the matrix material is not particulate, a sealing section is not required to prevent leakage from the matrix material.

[0100] The power supply component 20 includes a circuit board 22 and a battery 21 that are electrically connected to each other, and also includes an airflow sensor 23 that is electrically connected to the circuit board 22. The airflow sensor 23 is installed on the air intake channel of the aerosol generating device 11. When the user is suctioning, air flows through the airflow sensor 23. The airflow sensor 23 transmits a signal related to the acquired airflow information to the circuit board 22. The circuit board 22 controls the heating component 30 to start and records the suction count according to the signal.

[0101] The aerosol generating device 11 also includes a housing assembly 10, which houses the power supply assembly 20 and the heating assembly 30 to facilitate user carrying, transportation, and use of the aerosol generating device 11. The housing assembly 10 can be understood as an assembly of multiple components, and its interior is provided with fixing structures for assembling the power supply assembly 20 and the heating assembly 30, such as fixing protrusions, fixing grooves, etc.

[0102] Please see Figure 5 The heating assembly 30 includes a support sleeve 31, a heating tube 32, and a base 33. The heating tube 32 is disposed inside the support sleeve 31, and an airflow channel 35 is formed between the heating tube 32 and the support sleeve 31. One end of the heating tube 32 has an inlet / outlet 322. The base 33 is disposed at one end of the support sleeve 31 and is connected to the end of the heating tube 32 away from the inlet / outlet 322. The heating tube 32 has a heating chamber 321 inside, which is connected to the inlet / outlet 322. The heating chamber 321 is used to contain the aerosol-generated product A, and the inlet / outlet 322 is used for the aerosol-generated product A to enter and exit the heating chamber 321. The heating tube 32 is electrically connected to the power supply assembly 20, and is used to heat the aerosol-generated product A directly by heat conduction after being powered on and / or heat the airflow flowing through the airflow channel 35 to form a hot airflow, and use the hot airflow to heat the aerosol-generated product A. The arrow in the figure is used to indicate the flow direction of the airflow in the heating assembly 30 from the outside into the heating chamber 321.

[0103] Please continue reading. Figure 2 The heating element 32 is also provided with a heat exchanger 36 at one end near the base 33. The heat exchanger 36 has multiple heat exchange holes 361 inside. The heat exchange holes 361 are used to connect the airflow channel 35 and the heating chamber 321. The heat exchanger 36 has a heat conduction function and is used to heat the airflow flowing through the heat exchange holes 361 through heat exchange.

[0104] In some embodiments, the heating element 32 and the heat exchanger 36 are interference-fitted, and the heating element 32 and the heat exchanger 36 may be filled with a thermally conductive colloid to achieve a stable connection between them.

[0105] To better fix the heating element 32 and the heat exchanger 36, and to achieve at least a partial structural separation between the heat exchanger 36 and the base 33, an airflow gap 37 is formed between the heat exchanger 36 and the base 33. The base 33 includes a base body 331 and an insertion part 332 at one end facing the heating element 32. The insertion part 332 can be inserted into the heat exchanger 36, so that the base body 331 and the heat exchanger 36, and the heating element 32 and the base body 331 are spaced apart. The airflow gap 37 connects the airflow channel 35 and the heat exchange hole 361, so that cold air from the outside enters the airflow channel 35, flows through the airflow gap 37 and the heat exchange hole 361, and enters the interior of the aerosol generating product A inserted in the heating chamber 321 to heat the aerosol generating product A.

[0106] In some embodiments, the base 33 is further provided with an elastic element 38, which divides the internal space of the base 33 into a first cavity 333 and a second cavity 334. The first cavity 333 is connected to the heating cavity 331 through a heat exchange hole 361. The base 33 is also provided with a sensing cavity 335 connected to the second cavity 334. An airflow sensor 23 is disposed in the sensing cavity 335. When the user inhales, the airflow can quickly pass through the heating cavity 331 and flow to the first cavity 333 through the hole on the base 33, so that the first cavity 333... The air pressure in cavity 333 drops briefly, creating a negative pressure difference with the second cavity 334. This causes the elastic element 38 to deform, resulting in a change in the airflow at the sensing cavity 335. The airflow sensor 23 converts the detected airflow (pressure) change information into an electrical signal and transmits it to the circuit board 22 to trigger the heating element 33 to heat up. After the user finishes suctioning, the elastic element 38 returns to its original deformation, the airflow (pressure) in the sensing cavity 335 returns to its initial state, the airflow sensor 23 stops triggering the signal, and the heating element 33 stops working, waiting for the next suction.

[0107] In some embodiments, at least a portion of the support sleeve 31 is constructed from a substrate made of polyetheretherketone (PEEK), polyimide (PI), or polyphenylene sulfide (PPS), preferably polyetheretherketone (PEEK), which has good thermal conductivity and high-temperature resistance, and is low in manufacturing cost. In some embodiments, the inner diameter of the support sleeve 31 is 10mm-15mm. Specifically, the inner diameter of the support sleeve 31 can be 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm, or any value between two of the above.

[0108] In some embodiments, the base 33 may also be constructed to be made of a substrate, which is made of polyetheretherketone (PEEK), polyimide (PI) or polyphenylene sulfide (PPS), preferably polyetheretherketone (PEEK).

[0109] In some embodiments, the heating element 32 can be heated after being powered on. It is constructed of a conductive metal material or a conductive ceramic material. The heating element 32 is electrically connected to the power supply component 20 through a conductive part 34. The conductive part 34 is welded to the outer or inner side of the heating element 32.

[0110] In other embodiments, the inner or outer side of the heating tube 32 is provided with a heating line formed by a conductive coating or a heating line formed by a spiral arrangement of wires on the inner or outer side of the heating tube 32. The heating line is also electrically connected to the power supply component 20 through the conductive part 34, and the conductive part 34 and the heating line are welded together.

[0111] Since the heating element 32 is located inside the support sleeve 31, when the conductive part 34 is welded to the outer side of the heating element 32, the aerosol flowing back into the airflow channel 35 through the suction gap condenses and adheres to the welded joint between the conductive part 34 and the heating element 32 after the heating element 32 cools down. This makes the conductive part 34 prone to detach from the heating element 32 due to the erosion of the aerosol and the aerosol condensate, as well as the effect of high temperature. This causes the heating element 32 to malfunction and affects the user experience.

[0112] To address the aforementioned technical problems, this application improves the heating assembly 30, particularly the components of the heating assembly 30 that come into contact with the aerosol. Specifically, the oleophilic coating 40 can be applied to the portion of the aerosol that comes into contact with the airflow channel 35. This can also be understood as at least a portion of the structure of the support sleeve 31 forming the airflow channel 35 being made of a substrate with the oleophilic coating 40 applied to it. For example, the oleophilic coating 40 can be applied to the side of the support sleeve 31 facing and covering the heating tube 32. Alternatively, the oleophilic coating 40 can also be applied to the base 33, or to the side of the support sleeve 31 not covering the heating tube 32 (the portion positioned higher than the heating tube 32 according to usage convention). Alternatively, please refer to [link to relevant documentation]. Figure 6 The entire inner wall of the support sleeve 31 is provided with an oleophilic coating 40, that is, the overall structure of the support sleeve 31 forming the airflow channel 35 is made of a substrate, and the substrate is provided with an oleophilic coating 40.

[0113] An oleophilic coating 40 is provided on at least a portion of the structure of the support sleeve 31 of the heating component 30 or on the base 33. During the user's suction interval, the condensate formed by the high-temperature aerosol meeting the cold air can be adsorbed by the oleophilic coating 40 when passing through the support sleeve 31. This prevents the condensate from adhering to the heating tube 32 and the conductive part 34 and affecting the stability of the welding connection between the heating tube 32 and the conductive part 34. Moreover, the oleophilic coating 40 has good high-temperature resistance, oleophilicity, and strong adhesion. Even at the heating temperature (250℃-350℃) of the aerosol generating device 1, it can also be tightly bonded to the substrate and has a good adsorption effect on aerosols and their condensates.

[0114] This application also provides a heating component 30, including a substrate and an oleophilic coating 40, wherein the oleophilic coating 40 is located on the side of the substrate that contacts the aerosol. The heating component 30, the substrate and the oleophilic coating 40 have been described in detail in the above embodiments, and will not be repeated here.

[0115] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A method for preparing an oleophilic coating, characterized in that, include: According to the formula, the high-temperature resistant resin matrix is ​​dissolved in the solvent, and the oleophilic functional monomer, nano-reinforcing material and coupling agent are added and dispersed evenly to obtain a homogeneous coating liquid. The coating liquid is applied to at least one surface of a substrate to form a wet film; The substrate coated with the wet film is subjected to step curing to form an oleophilic coating on the substrate.

2. The method for preparing the oleophilic coating according to claim 1, characterized in that, The mass fraction ratio of the high-temperature resistant resin matrix, the oleophilic functional monomer, the nano-reinforcing material, and the coupling agent ranges from 50-70:10-20:5-10:3-5.

3. The method for preparing the oleophilic coating according to claim 1, characterized in that, Step-curing the substrate coated with the wet film to form an oleophilic coating on the substrate includes: The substrate coated with the wet film is pre-cured at a first temperature for a first preset time; The substrate coated with the pre-cured wet film is heat-treated at a second temperature for a second preset time. The substrate coated with the wet film, which has undergone heat treatment, is cured at a third temperature for a third preset time to form the oleophilic coating.

4. The method for preparing the oleophilic coating according to claim 3, characterized in that, The substrate coated with the wet film is subjected to step curing to satisfy at least one of the following conditions (1)-(6): (1) The range of the first temperature is 70℃-90℃; (2) The value range of the first preset time is 40min-80min; (3) The range of the second temperature is 180℃-220℃; (4) The value range of the second preset time is 1.5h-2.5h; (5) The value range of the third temperature is 260℃-300℃; (6) The value range of the third preset time is 40min-80min.

5. The method for preparing the oleophilic coating according to claim 1, characterized in that, The preparation method further includes pretreating the substrate before coating the coating liquid onto at least one surface of the substrate to form a wet film, so that the surface roughness of the substrate reaches a preset value and active oxygen-containing groups are generated on the surface of the substrate.

6. The method for preparing the oleophilic coating according to claim 5, characterized in that, Pretreatment of the substrate includes: The surface of the substrate to be coated with the coating liquid is sandblasted to make the surface roughness of the substrate reach the preset value; The substrate, after being sandblasted, is placed in an oxygen atmosphere for plasma activation treatment to generate active oxygen-containing groups on the surface of the substrate.

7. The method for preparing the oleophilic coating according to claim 5 or 6, characterized in that, The preset value of the surface roughness ranges from 1.2 μm to 1.8 μm.

8. The method for preparing the oleophilic coating according to claim 1, characterized in that, The preparation method satisfies at least one of the following conditions (1)-(9): (1) The high-temperature resistant resin matrix includes fluorinated polyimide or fluorinated epoxy resin; (2) The solvent includes N-methylpyrrolidone; (3) The lipophilic functional monomers include perfluoroalkyl acrylates; (4) The nano-reinforcing material includes carbon nanotubes; (5) The coupling agent includes silane; (6) The thickness of the oleophilic coating is 15μm-25μm; (7) The thickness of the wet film is 45μm-55μm; (8) The solid content of the coating liquid is 20%-40%; (9) Dissolve the high-temperature resistant resin matrix in the solvent according to the ratio, and add the oleophilic functional monomer, nano-reinforcing material and coupling agent to disperse evenly to obtain a homogeneous coating liquid, including dispersion by ultrasound, with the ultrasound time being 1.5h-2.5h.

9. An oleophilic coating, characterized in that, The oleophilic coating is prepared by the method described in any one of claims 1-8.

10. A heating assembly, characterized in that, The coating includes a substrate and the oleophilic coating prepared by the preparation method according to any one of claims 1-8 or the oleophilic coating according to claim 9, wherein the oleophilic coating is located on the side of the substrate in contact with the aerosol.

11. The heating assembly according to claim 10, characterized in that, The heating component includes: Support sleeve; and A heating element is disposed inside the support sleeve, and an airflow channel is formed between the support sleeve and the heating element. The heating element has a heating cavity for accommodating the aerosol-generated product, and the heating cavity is connected to the airflow channel. The portion of the support sleeve that forms the airflow channel is made of the substrate, and the substrate is provided with the oleophilic coating.

12. An aerosol generating device, characterized in that, Includes the heating component as described in claim 10 or 11.

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