Liquid storage material and preparation method thereof, heating module and aerosol generating device

Abstract

The invention belongs to the technical field of liquid storage materials, and particularly relates to a liquid storage material and a preparation method thereof, a heating module and an aerosol generating device. The liquid storage material comprises a liquid storage base material with a porous structure and first mesoporous particles and second mesoporous particles which are at least loaded on the surface of a porous framework of the liquid storage base material, the average pore size of the first mesoporous particles is larger than that of the second mesoporous particles, and first essence is loaded in pores of the first mesoporous particles; second essence is loaded in holes of the second mesoporous particles, and the molecular weight of the first essence is higher than that of the second essence. Through graded loading of the first macromolecular essence and the second micromolecular essence by the first mesoporous particles and the second mesoporous particles respectively, the first macromolecular essence is released preferentially in the vaporization process of the liquid storage material, release of the second micromolecular essence is delayed, accurate regulation and control of the fragrance and taste sequence in the aerosol are realized, and the quality of the aerosol is improved. The liquid storage material is endowed with the characteristic of precisely regulating and controlling essence release kinetics.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid storage materials, and particularly relates to a liquid storage material, a preparation method thereof, a heating module, and an aerosol generating device. BACKGROUND

[0002] The aerosol generating device is an electronic device that realizes vaporization through heating. The aerosol generating device generally comprises a heating module, a power supply system, a control system, and the like. The heating module is the core part of the aerosol generating device, and mainly comprises a heating assembly and a liquid storage material. The aerosol generating substrate stored in the liquid storage material is heated by the heating assembly, and can be vaporized to form an aerosol for a user to smoke. Therefore, the storage capacity of the liquid storage material for the aerosol generating substrate has an important influence on the actual vaporization effect of the aerosol generating device.

[0003] At present, the front note of the taste of the aerosol formed after the aerosol generating substrate is vaporized is usually dominated by fragrances with high volatility and small molecular weight (such as mint and citrus), and the rear note is composed of fragrances with low volatility and large molecular weight (such as butter and caramel), and the vaporization order cannot be changed. This makes the order of the taste experience of the aerosol fixed and single, and cannot improve the diversity of the taste of the aerosol. SUMMARY The application aims to provide a liquid storage material and a preparation method thereof, and a heating module and an aerosol generating device, and aims to solve the problem that the release order is fixed and single due to the influence of the molecular weight and volatility of the fragrances in the existing aerosol generating substrate to a certain extent.

[0004] To achieve the above application purposes, the technical solutions adopted by the application are as follows: In a first aspect, the application provides a liquid storage material, comprising a porous liquid storage substrate and first mesoporous particles and second mesoporous particles loaded on the surface of the porous framework of the liquid storage substrate, the average pore diameter of the first mesoporous particles is greater than the average pore diameter of the second mesoporous particles, the pores of the first mesoporous particles are loaded with a first fragrance, the pores of the second mesoporous particles are loaded with a second fragrance, and the molecular weight of the first fragrance is higher than the molecular weight of the second fragrance.

[0005] In some possible implementation manners, the second fragrance is loaded in the pores of the second mesoporous particles in the form of an inclusion compound, and the inclusion compound comprises a carrier material with a molecular cavity and the second fragrance located in the molecular cavity.

[0006] In some possible implementation manners, the material in the liquid storage substrate comprises at least one of polyethylene terephthalate, polyamide, polypropylene, and polyethylene.

[0007] In some possible implementations, the average particle size of the first mesoporous particles is higher than the average particle size of the second mesoporous particles.

[0008] In some possible implementations, the carrier material comprises at least one of β-cyclodextrin, α-cyclodextrin, γ-cyclodextrin, calixarene, dendrimer, metal-organic framework.

[0009] In some possible implementations, the molar ratio of the second fragrance to the carrier material is 1: (1-1.2).

[0010] In some possible implementations, the porosity of the liquid storage substrate is 90%-96%.

[0011] In some possible implementations, the density of the liquid storage substrate is 0.05 g / cm 3 -0.1 g / cm 3 .

[0012] In some possible implementations, the mesoporous substrate of the first mesoporous particles and the second mesoporous particles are independently selected from a group consisting of silicon-based mesoporous materials.

[0013] In some possible implementations, the average particle size of the first mesoporous particles is 1 μm-10 μm.

[0014] In some possible implementations, the average pore size of the first mesoporous particles is 5 nm-10 nm.

[0015] In some possible implementations, the porosity of the first mesoporous particles is 40%-60%.

[0016] In some possible implementations, the mesoporous substrate of the first mesoporous particles is selected from at least one of SBA-15, KIT-6, FDU-12, CMK-3, CMK-5, CMK-8, MIL-101(Cr), MIL-100(Fe), UiO-66.

[0017] In some possible implementations, the average particle size of the second mesoporous particles is 0.5 μm-5 μm.

[0018] In some possible implementations, the average pore size of the second mesoporous particles is 2 nm-4 nm.

[0019] In some possible implementations, the porosity of the second mesoporous particles is 50%-70%.

[0020] In some possible implementations, the mesoporous substrate of the second mesoporous particles is selected from at least one of MCM-41, NH2-MCM-41, Al-MCM-41.

[0021] In some possible implementations, the first fragrance has a molecular weight of 200 Da to 500 Da.

[0022] In some possible implementations, the first fragrance includes at least one of amber derivative, sclareolide, acetylated cedrene, butter, caramel.

[0023] In some possible implementations, the second fragrance has a molecular weight of 70 Da to 250 Da.

[0024] In some possible implementations, the second fragrance includes at least one of berry fragrance, fruity fragrance, floral fragrance, vanilla flavor fragrance, wine fragrance.

[0025] In some possible implementations, a mass ratio of the first mesoporous particle to the first fragrance is 100%: (50% to 80%).

[0026] In some possible implementations, a mass ratio of the second mesoporous particle to the second fragrance is 100%: (15% to 25%).

[0027] In some possible implementations, in the liquid storage substrate, a mass ratio of the loaded first mesoporous particle and the second mesoporous particle is (3 to 5): 1.

[0028] In some possible implementations, a porous framework surface of the liquid storage substrate is modified with an adhesion layer, a coupling agent is grafted on a surface of the adhesion layer away from the liquid storage substrate, and the first mesoporous particle and the second mesoporous particle are loaded to the surface of the liquid storage substrate through the adhesion layer and the coupling agent.

[0029] In some possible implementations, the adhesion layer includes at least one adhesion-like polymer of polydopamine, tannin polymer, catechol polymer, gallic acid polymer, catecholamine polymer.

[0030] In some possible implementations, the coupling agent includes at least one of γ-aminopropyl triethoxysilane, N-aminoethyl-γ-aminopropyl trimethoxysilane, γ-glycidyl ether propyl trimethoxysilane, γ-methacryloyloxy propyl trimethoxysilane, titanate coupling agent, zirconate coupling agent.

[0031] In some possible implementations, in the adhesion layer, the adhesion-like polymer is combined with coordination ions.

[0032] In some possible implementations, a thickness of the adhesion layer is 100 nm to 300 nm.

[0033] In some possible implementations, the coordination ions include at least one metal ion in iron ions, copper ions, lithium ions, silver ions.

[0034] In some possible implementations, the coordination ions include at least one of boric acid ions, ionic metal organic frameworks.

[0035] In a second aspect, the present application provides a preparation method of a liquid storage material, comprising the following steps: preparing first mesoporous particles loaded with a first fragrance; preparing second mesoporous particles loaded with a second fragrance; the average pore size of the first mesoporous particles is larger than that of the second mesoporous particles, and the molecular weight of the first fragrance is higher than that of the second fragrance; obtaining a porous structure of a liquid storage substrate, and loading the first mesoporous particles and the second mesoporous particles at least on the surface of the porous framework of the liquid storage substrate to obtain a liquid storage material.

[0036] In some possible implementations, the step of preparing the first mesoporous particles comprises: dispersing a first mesoporous substrate and the first fragrance in a solvent, filling the first fragrance into the pores of the first mesoporous substrate by a vacuum impregnation method, and cleaning and drying to obtain the first mesoporous particles. The step of preparing the second mesoporous particles comprises: preparing a clathrate powder of the second fragrance and a carrier material with a molecular cavity, dispersing the clathrate powder and a second mesoporous substrate in a solvent, filling the clathrate powder into the pores of the second mesoporous substrate by a vacuum impregnation method, and cleaning and drying to obtain the second mesoporous particles.

[0037] In some possible implementations, the carrier material includes at least one of β-cyclodextrin, α-cyclodextrin, γ-cyclodextrin, calixarene, dendrimer, metal organic framework.

[0038] In some possible implementations, the first mesoporous substrate is selected from at least one of SBA-15, KIT-6, FDU-12, CMK-3, CMK-5, CMK-8, MIL-101(Cr), MIL-100(Fe), UiO-66.

[0039] In some possible implementations, the second mesoporous substrate is selected from at least one of MCM-41, NH2-MCM-41, Al-MCM-41.

[0040] In some possible implementations, the first fragrance includes at least one of amber derivatives, sclareolide, acetylated cedrene, butter, caramel.

[0041] In some possible implementations, the second essence includes at least one of berry essence, fruity essence, floral essence, vanilla flavor essence, and wine essence.

[0042] In some possible implementations, before the first mesoporous particles and the second mesoporous particles are at least loaded to the porous framework surface of the liquid storage substrate, the liquid storage substrate is modified as follows: A modification adhesion layer is performed on the porous framework surface of the liquid storage substrate. A coupling agent is grafted on the surface of the adhesion layer to obtain the modified substrate.

[0043] In some possible implementations, the step of preparing the adhesion layer includes: immersing the liquid storage substrate in a solution of adhesion monomers, and performing a polymerization reaction on the porous framework surface of the liquid storage substrate to form an adhesion polymer to obtain the adhesion layer. In some possible implementations, the step of grafting the coupling agent on the surface of the adhesion layer includes: immersing the modified substrate of the adhesion layer in a solution of the coupling agent, and grafting the coupling agent on the surface of the adhesion layer through a hydrolysis and condensation reaction to obtain the modified substrate.

[0044] In some possible implementations, the adhesion monomers include at least one of dopamine, tannic acid, catechol, gallic acid, and catecholamine.

[0045] In some possible implementations, the solution of the adhesion monomers further contains a coordination material, and the coordination material coordinates with the adhesion polymer to form a complex.

[0046] In some possible implementations, the coupling agent includes at least one of γ-aminopropyl triethoxysilane, N-aminoethyl-γ-aminopropyl trimethoxysilane, γ-glycidoxypropyl trimethoxysilane, γ-methacryloyloxypropyl trimethoxysilane, a titanate coupling agent, and a zirconate coupling agent.

[0047] In some possible implementations, the concentration of the adhesion monomers in the solution of the adhesion monomers is 2.0 g / L to 3.0 g / L.

[0048] In some possible implementations, the concentration of the coordination material in the solution of the adhesion monomers is 0.5 g / L to 0.6 g / L.

[0049] In some possible implementations, the volume percentage content of the coupling agent in the solution of the coupling agent is 5% to 10%.

[0050] In some possible implementations, the average particle size of the first mesoporous particles is higher than the average particle size of the second mesoporous particles, and the step of loading the first mesoporous particles and the second mesoporous particles comprises: immersing the modified substrate in the suspension of the first mesoporous particles, performing a mixing reaction to load the first mesoporous particles onto the surface of the modified substrate, and drying to obtain a substrate loaded with the first mesoporous particles; immersing the substrate loaded with the first mesoporous particles in the suspension of the second mesoporous particles, performing a standing treatment to load the second mesoporous particles onto the surface of the modified substrate, washing and drying, and obtaining the liquid storage material.

[0051] In some possible implementations, the concentration of the suspension of the first mesoporous particles is 10 mg / mL to 20 mg / mL.

[0052] In some possible implementations, the concentration of the suspension of the second mesoporous particles is 5 mg / mL to 10 mg / mL.

[0053] In a third aspect, the present application provides a heating module, comprising the above-mentioned liquid storage material and / or the liquid storage material prepared by the above-mentioned method.

[0054] In a fourth aspect, the present application provides an aerosol generating device, comprising a power supply assembly and the above-mentioned heating module.

[0055] The first aspect of the present application provides a liquid storage material for storing an aerosol generating substrate (i.e., an aerosol generating substrate), including a porous liquid storage substrate and at least first mesoporous particles and second mesoporous particles loaded on the surface of the porous framework of the liquid storage substrate. The mesoporous particles refer to porous materials with nanoscale pore sizes and high specific surface areas. In the present application, the first mesoporous particles and the second mesoporous particles are at least loaded on the surface of the porous framework of the liquid storage substrate, rather than being filled in the pores of the liquid storage substrate, so as not to block the pores of the liquid storage substrate and ensure the liquid storage performance of the liquid storage material. The pores of the first mesoporous particles are loaded with a first flavor, and the pores of the second mesoporous particles are loaded with a second flavor. The molecular weight of the first flavor is higher than that of the second flavor. The higher the molecular weight of the flavor, the more difficult it is to volatilize and vaporize. The flavor with a small molecular weight is more likely to volatilize and vaporize than the flavor with a large molecular weight. In the present application, the first mesoporous particles are loaded with a first flavor with a large molecular weight. Since the average pore size of the first mesoporous particles is relatively large, the corresponding specific surface area is relatively small, resulting in a weak confinement effect of the pores in the mesoporous particles on the first flavor with a large molecular weight and a weak adsorption force. In the second mesoporous material, the second flavor with a small molecular weight is loaded. Since the average pore size of the second mesoporous particles is small, the corresponding specific surface area is large, resulting in a strong confinement effect of the pores in the mesoporous particles on the second flavor with a small molecular weight and a strong adsorption force. Thus, the loading of the flavors by the mesoporous particles in the liquid storage material can delay the release of the flavors. Moreover, the first mesoporous particles and the second mesoporous particles are used to load the large-molecular first flavor and the small-molecular second flavor, respectively. The adsorption force of the mesoporous particles on the large-molecular first flavor is weaker than that on the small-molecular second flavor, so that the large-molecular first flavor is preferentially released and vaporized during the vaporization of the liquid storage material, while the release and vaporization of the small-molecular second flavor are delayed, so that the small-molecular second flavor, which originally belongs to the pre-tune, is released later, and the large-molecular first flavor, which originally belongs to the post-tune, is preferentially released, thereby realizing precise control of the order of the flavor taste in the aerosol and giving the liquid storage material the characteristics of precise control of the release kinetics of the flavors. In addition, the liquid storage material loaded with the porous mesoporous particles can also improve the adsorption capacity and stability of the aerosol generating substrate.

[0056] The preparation method of the liquid storage material provided in the second aspect of the present application is to prepare first mesoporous particles loaded with a first fragrance and second mesoporous particles loaded with a second fragrance, respectively, and load the first mesoporous particles and the second mesoporous particles to the porous framework surface of the liquid storage substrate. In this way, the average pore size of the first mesoporous particles is relatively large, and the corresponding specific surface area is relatively small, which leads to weak confinement and adsorption of the first fragrance with a large molecular weight in the mesoporous particles. The average pore size of the second mesoporous particles is small, and the corresponding specific surface area is large, which leads to strong confinement and adsorption of the second fragrance with a small molecular weight in the mesoporous particles. Thus, by loading the first mesoporous particles and the second mesoporous particles to the large-molecular first fragrance and the small-molecular second fragrance, respectively, the large-molecular first fragrance is released and vaporized preferentially in the vaporization process of the liquid storage material, and the release and vaporization of the small-molecular second fragrance are delayed, so that the small-molecular second fragrance originally belonging to the top note is released later, and the large-molecular first fragrance originally belonging to the base note is released preferentially, thereby realizing precise control of the order of the flavor taste in the aerosol and giving the liquid storage material the characteristic of precisely controlling the release kinetics of the fragrance.

[0057] The heating module provided in the third aspect of the present application comprises the above-mentioned liquid storage material, and the liquid storage material is loaded with the first mesoporous particles and the second mesoporous particles loaded with the large-molecular first fragrance and the small-molecular second fragrance, respectively. Thus, in the heating process of the heating module, the liquid storage material can release and vaporize the large-molecular first fragrance preferentially, and the release and vaporization of the small-molecular second fragrance are delayed, thereby realizing precise control of the order of the flavor taste in the aerosol and improving the taste level of the fragrance in the aerosol.

[0058] The aerosol generating device provided in the fourth aspect of the present application comprises the above-mentioned heating module, so that the aerosol generating device can make the small-molecular second fragrance originally belonging to the top note be released later, and the large-molecular first fragrance originally belonging to the base note be released preferentially, thereby realizing precise control of the order of the flavor taste in the aerosol and giving the liquid storage material the characteristic of precisely controlling the release kinetics of the fragrance. BRIEF DESCRIPTION OF DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0060] Figure 1 is a schematic diagram of the macroscopic shape of the liquid storage material provided in the embodiments of the present application; Figure 2 is a schematic diagram of the surface microstructure of the liquid storage material provided in the embodiments of the present application; Figure 3 is a flowchart of a preparation method of a liquid storage material provided by an embodiment of the present application; Figure 4 is a flowchart of a preparation method of a liquid storage material provided by Embodiment 1 of the present application. DETAILED DESCRIPTION

[0061] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, and not to limit the present application.

[0062] In the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0063] In the present application, "at least one" means one or more, and "a plurality of" means two or more. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, "at least one of a, b or c", or "at least one of a, b and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b and c can be single or multiple.

[0064] It should be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, and part or all of the steps can be executed in parallel or in sequence, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0065] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0066] The weight of the related components mentioned in the embodiments of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of each component, therefore, as long as the content of the related components in the embodiments of the present application is enlarged or reduced in proportion, it is within the scope disclosed by the embodiments of the present application. Specifically, the mass mentioned in the embodiments of the present application can be µg, mg, g, kg and other mass units commonly known in the chemical field.

[0067] The terms "first", "second", "third", etc. are used only for the purpose of description, to distinguish between objects, such as substances, from one another, and are not to be construed as indicating or implying relative importance or indicating the number of the technical features indicated. For example, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX, without departing from the scope of the embodiments of the present application. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0068] The term "aerosol-generating device" is a device that converts a liquid aerosol substrate into a gaseous or aerosol (suspended particles) for a user to use by an electric heating technology.

[0069] The term "aerosol-generating substrate" refers to a liquid base component used in an aerosol-generating device, which can also be referred to as "aerosol-generating substrate", and it is a raw material that generates an aerosol by heating.

[0070] The term "aerosol" refers to all colloids that can be suspended in the air, and in the present application, it mainly refers to a mixture of suspended particles / suspended particles generated when the aerosol-generating device is working, which is formed by heating and vaporizing the aerosol-generating substrate, and the "mist" inhaled by the user is such an aerosol.

[0071] At present, the front note of the taste of the aerosol formed after the aerosol-generating substrate is vaporized is usually dominated by volatile high-molecular-weight fragrances (such as menthol, citrus), and the rear note is composed of volatile low-molecular-weight fragrances (such as butter, caramel), and the vaporization order cannot be exchanged. The order of the user's taste experience of the aerosol is fixed and single, and the diversity of the taste of the aerosol cannot be improved.

[0072] In order to improve the richness of the user's taste of the aerosol flavor, in some technologies, the concentration of the flavor component in the aerosol-generating substrate is increased to enrich the taste of the aerosol, but high-concentration fragrances can exceed the solubility limit of the solvent, causing crystallization or oil-water separation, and blocking the heating assembly; and high-concentration fragrances can also cause a burning sensation in the throat or coughing. In some technologies, the types of flavor components in the aerosol-generating substrate are increased to enrich the taste of the aerosol, but the addition of multiple fragrances in the aerosol-generating substrate can easily cause flavor confusion, and different fragrance components can react chemically to generate potentially harmful substances; and the difference in oxidation-reduction potential of different components can cause accelerated degradation and produce off-flavors. These methods cannot effectively solve the problem that the order of the user's taste experience of the aerosol is fixed and single, and the diversity of the taste of the aerosol cannot be improved.

[0073] An aerosol generating device is an electronic device that realizes vaporization through heating means, and generally includes a heating module, a power supply system, a control system, and the like. The heating module is the core part of the aerosol generating device, mainly including a heating assembly, a liquid storage material, and the like. The aerosol generating substrate stored in the liquid storage material is heated by the heating assembly, and can be vaporized to form an aerosol for a user to smoke. Obviously, the storage capacity of the liquid storage material for the aerosol generating substrate has an important influence on the actual vaporization effect of the aerosol generating device.

[0074] Based on this, the embodiments of the present application provide a liquid storage material. Different molecular sizes of fragrances are loaded on the liquid storage substrate by modifying the liquid storage substrate. The different molecular sizes of fragrances can be released in stages by the confinement of the liquid storage substrate, and the sequence of the flavor taste in the aerosol can be accurately controlled.

[0075] For the convenience of understanding, the present application is specifically described by the following embodiments. It should be understood that the following embodiments are only used to further illustrate the schemes of the present application and are not used to limit the scope of the present application.

[0076] The first aspect of the embodiments of the present application provides a liquid storage material, which includes a porous liquid storage substrate and at least first mesoporous particles and second mesoporous particles loaded on the surface of the porous framework of the liquid storage substrate. The average pore size of the first mesoporous particles is larger than that of the second mesoporous particles. The first fragrance is loaded in the pores of the first mesoporous particles, and the second fragrance is loaded in the pores of the second mesoporous particles. The molecular weight of the first fragrance is higher than that of the second fragrance.

[0077] The liquid storage material provided by the first aspect of the embodiments of the present application is used for storing an aerosol generating substrate (i.e., an aerosol generating substrate), and includes a porous structure of a liquid storage substrate and at least first mesoporous particles and second mesoporous particles loaded on the surface of the porous framework of the porous structure of the liquid storage substrate. The mesoporous particles refer to porous materials with nanoscale pore diameters and high specific surface areas. In the embodiments of the present application, the first mesoporous particles and the second mesoporous particles are loaded on the surface of the porous framework of the porous structure of the liquid storage substrate. The surface of the porous framework can be the surface of the framework outside the liquid storage substrate or the surface of the framework of the void structure inside the liquid storage substrate, and is not filled in the pores of the liquid storage substrate, so as not to block the pores of the liquid storage substrate and ensure the liquid storage performance of the liquid storage material. The pores of the first mesoporous particles are loaded with a first flavor, and the pores of the second mesoporous particles are loaded with a second flavor. The molecular weight of the first flavor is higher than that of the second flavor. The higher the molecular weight of the flavor, the more difficult it is to volatilize and vaporize. The flavor with a small molecular weight is more likely to volatilize and vaporize than the flavor with a large molecular weight. In the first mesoporous particles, the first flavor with a large molecular weight is loaded. Since the average pore diameter of the first mesoporous particles is relatively large, the corresponding specific surface area is relatively small, which leads to a weak confinement effect of the pores in the mesoporous particles on the first flavor with a large molecular weight and a weak adsorption force. In the second mesoporous material, the second flavor with a small molecular weight is loaded. Since the average pore diameter of the second mesoporous particles is small, the corresponding specific surface area is large, which leads to a strong confinement effect of the pores in the mesoporous particles on the second flavor with a small molecular weight and a strong adsorption force. Thus, the loading of the flavors by the mesoporous particles in the liquid storage material can delay the release of the flavors. In addition, the first mesoporous particles and the second mesoporous particles are used to load the large-molecule first flavor and the small-molecule second flavor, respectively. The adsorption force of the mesoporous particles on the large-molecule first flavor is weaker than that on the small-molecule second flavor, so that the large-molecule first flavor is preferentially released and vaporized during the vaporization of the liquid storage material, and the release and vaporization of the small-molecule second flavor are delayed, so that the small-molecule second flavor originally belonging to the pre-tune is released later, and the large-molecule first flavor originally belonging to the post-tune is preferentially released, thereby realizing the precise control of the order of the flavor taste in the aerosol and giving the liquid storage material the characteristics of precisely controlling the release kinetics of the flavors. In addition, the liquid storage material loaded with the porous mesoporous particles can also improve the adsorption capacity and stability of the aerosol generating substrate.

[0078] In some embodiments, in the liquid storage material of the present application, the mesoporous material loaded with flavors can be used in an aerosol generating device without additional flavors in the aerosol generating substrate. The flavors loaded in the mesoporous particles in the liquid storage material can realize the precise control of the order of the flavor taste in the aerosol and improve the taste level of the flavors in the aerosol. In other embodiments, the liquid storage material can be used in an aerosol generating device, and additional flavors can also be added to the aerosol generating substrate. The synergistic effect of the flavor components in the aerosol generating substrate can increase the taste intensity of the flavors in the aerosol.

[0079] In some embodiments, the shape of the liquid storage material can be more flexible, thereby improving the flexibility of the liquid storage material in application. For example, the shape of the liquid storage material is as shown in FIG. 6. Figure 1

[0080] In some possible implementations, the second flavor is loaded in the pores of the second mesoporous particles in the form of a clathrate, which includes a carrier material having a molecular cavity and the second flavor located in the molecular cavity. In this case, the clathrate is composed of two compounds: one is a compound that can confine other compounds in its molecular cavity, which is called a carrier material, a clathrate or a host molecule; the other is a compound confined in the molecular cavity of the carrier material structure, which is called a clathrate or a guest molecule, which is the second flavor in the embodiments of the present application. In this case, the second flavor forms a clathrate with the carrier material having a molecular cavity, and the second flavor is clathrated in the cavity of the carrier material. The combination of small-pore mesoporous particles can better delay the release rate of small-molecule second flavor, thereby better achieving precise control of the order of flavor taste, making the originally front-ordered small-molecule second flavor be released later, and the originally back-ordered large-molecule first flavor be released preferentially, achieving precise inversion of the order of taste in aerosol, improving the diversity of aerosol taste, enriching the taste of aerosol, and improving the selection performance of aerosol taste.

[0081] In some possible implementations, the carrier material includes at least one of β-cyclodextrin, a-cyclodextrin, γ-cyclodextrin, calixarene, dendrimer, and metal organic framework. In this case, these carrier materials all have a molecular cavity structure, which can clathrate the second flavor in the cavity of the carrier material through non-covalent interaction (such as hydrogen bond, van der Waals force, π-π stacking, hydrophobic effect), thereby delaying the release rate of small-molecule second flavor. Among them, a / β / γ-cyclodextrin forms a ring-shaped cage cavity through sugar units, and calixarene forms a phenolic ring cavity through phenolic aldehyde. The cavity size of a / β / γ-cyclodextrin and calixarene (cyclodextrin is a sugar unit ring, and calixarene is a phenolic ring) can be adjusted (0.5-2 nm). The highly branched three-dimensional structure of the dendrimer can form an internal cavity structure. The metal nodes and organic ligands in the metal organic framework self-assemble to form a network cavity structure, and the pore size can be adjusted (0.5-5 nm) with a very high specific surface area.

[0082] ​In some embodiments, the carrier material comprises β-cyclodextrin. Exemplarily, the β-cyclodextrin can be hydroxypropyl-β-cyclodextrin (HP-β-CD), sulfobutyl ether-β-cyclodextrin (SBE-β-CD), or methylated β-cyclodextrin, etc. The β-cyclodextrin in the embodiments of the present application is a ring-shaped hollow cage molecule connected by 7 glucose units through α-1, 4-glycosidic bonds. The inner cavity is composed of C-H and epoxy groups to form a hydrophobic environment, and the outer hydroxyl groups (-OH) are distributed on the surface of the molecule, which has strong hydrophilicity and can interact with the hydrophobic groups of the fragrance molecules through the hydrophobic cavity. After the β-cyclodextrin forms an inclusion compound with the fragrance molecules and is adsorbed into the first mesoporous particles with small pore sizes, the release rate of the small molecule second fragrance can be further delayed. Exemplarily, taking menthol fragrance as an example, the menthol fragrance can be completely embedded in the cavity of the β-cyclodextrin, which not only inhibits the volatilization of menthol but also plays a role in slow release, thereby delaying the release rate of the small molecule second fragrance.

[0083] In some embodiments, the outer diameter of the β-cyclodextrin is about 1.5 nm to 1.6 nm, the inner cavity diameter is about 0.78 nm, and the height is about 0.78 nm. Taking a menthol fragrance molecule as an example, the size of the menthol molecule is about 0.6 nm. When the fragrance molecule is embedded in the cavity of the β-cyclodextrin, the hydroxyl groups (-OH) of part of the glucose units are slightly displaced, causing the outer edge to expand slightly, so that the diameter of the monomer inclusion compound formed is about 1.5 nm to 1.8 nm.

[0084] In some possible implementations, the molar ratio of the second fragrance to the carrier material is 1:(1-1.2). Exemplarily, the molar ratio of the second fragrance to the carrier material can be 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.2, or any point value or interval value between any two point values. In this case, the second fragrance can be sufficiently ensured to be included in the molecular cavity of the carrier material.

[0085] Exemplarily, taking menthol as the small molecule second fragrance and β-cyclodextrin as the carrier material, the molar ratio of menthol to β-cyclodextrin is 1:(1-1.2), and the corresponding mass ratio of menthol to β-cyclodextrin is 1:(5-6). The menthol small molecule second fragrance is included in the ring-shaped cavity of the glucose unit of the β-cyclodextrin to form an inclusion compound, thereby delaying the release rate of the small molecule second fragrance.

[0086] In some possible implementations, the material in the liquid storage substrate includes at least one of polyethylene terephthalate (PET), polyamide (PA), polypropylene (PP), and polyethylene (PE). The liquid storage substrate made of these polymer materials can improve the liquid conductivity, chemical stability, temperature resistance, sealing property, safety, and other properties of the liquid storage substrate. Among them, polyethylene terephthalate (PET) has excellent chemical stability and strong resistance to glycerol, propylene glycol, nicotine, and flavor ingredients in the aerosol generating substrate, and is not prone to chemical reaction or release of harmful substances, thereby ensuring the pure flavor of the aerosol generating substrate. At the same time, it has good high-temperature resistance and is not prone to deformation or decomposition at high temperatures, and has high safety; the fiber structure is controllable, and a high-porosity structure can be made through a fiberization process (such as melt blowing), thereby providing good capillary action and ensuring stable conduction of the aerosol generating substrate to the heating element. Polyamide (PA, nylon) has high strength and wear resistance, high fiber tensile strength, and is resistant to friction, which can reduce the risk of damage to the liquid storage substrate caused by repeated plugging or vibration; it has good chemical resistance and is stable to most aerosol generating substrate ingredients, has good elastic recovery, can adapt to the compression and expansion of the liquid storage substrate, and maintains structural stability. Polypropylene (PP) has outstanding chemical inertness and does not react with acid or base substances, thereby ensuring stable quality of the aerosol generating substrate, and has a wide temperature resistance range, is suitable for the working temperature of the aerosol generating substrate, and does not release harmful substances. Polyethylene (PE) has excellent chemical stability and is particularly suitable for aerosol generating substrates containing acidic additives. It has good flexibility and can be made into a liquid storage substrate with good adhesion, thereby reducing the risk of liquid leakage. Moreover, it has excellent low-temperature resistance and is not prone to embrittlement at low temperatures, and is suitable for use in cold environments.

[0087] In some possible implementations, the porosity of the liquid storage substrate is 90% to 96%. For example, the porosity of the liquid storage substrate can be 90%, 91%, 92%, 93%, 94%, 95%, or 96%, or any interval value between any two of these typical but non-limiting point values. In this case, the porosity of the liquid storage substrate is 90% to 96%, which means that more than 90% of the volume of the liquid storage substrate is a pore structure that can accommodate more aerosol generating substrate and is also conducive to mesoporous particle loading. The liquid storage substrate with high porosity usually has a high specific surface area and connected pores, and the capillary action is strong, so the aerosol generating substrate can quickly penetrate to the heating element through capillary action. Moreover, the pores in the liquid storage substrate with high porosity can lock the aerosol generating substrate in the micro-nano pores through the locking action of surface tension, thereby reducing or preventing liquid leakage.

[0088] In some possible implementations, the density of the liquid storage substrate is 0.05 g / cm 3 to 0.1 g / cm 3 . For example, the density of the liquid storage substrate can be 0.05 g / cm 3 , 0.06 g / cm 30.07 g / cm3 3 0.08 g / cm3 3 0.09 g / cm3 3 0.1 g / cm3 3 and so on. In this case, the density of the liquid storage substrate is low, and low density generally corresponds to ultrahigh porosity, providing abundant storage space for the aerosol generating substrate. The liquid storage substrate is beneficial to achieve lightweight, high liquid storage, zero liquid leakage, strong heat insulation, and other characteristics.

[0089] In some possible implementations, the mesoporous substrate of the first mesoporous particles and the second mesoporous particles is independently selected from a silicon-based mesoporous material. In this case, the silicon-based mesoporous material has pore order, and can form one-dimensional straight pores, two-dimensional hexagonal, three-dimensional cubic, or worm-like disordered structures. The core advantages of the silicon-based mesoporous material in the embodiments of the present application mainly include: 1. adjustable pore size and structural stability: the pore size of the silicon-based mesoporous material (such as SBA-15, MCM-41) can be accurately controlled by the synthesis conditions. This characteristic enables it to match fragrances of different molecular weights, achieve efficient loading through large pore size, and at the same time avoid pore blockage. 2. High specific surface area and pore volume: the silicon-based mesoporous material has a large specific surface area and pore volume, and this high loading capacity can significantly increase the adsorption amount of the fragrance. 3. Surface easy to functionalize: the surface of the silicon-based material is rich in silicon hydroxyl groups (-SiOH), which can be chemically modified (such as amino, thiol, or epoxy grafting) to enhance the interaction with fragrance molecules. 4. Chemical and thermal stability: the silicon-based material can maintain structural stability under drying conditions of 60°C to 80°C, and is resistant to organic solvents, suitable for the high-temperature vaporization environment of the aerosol generating substrate.

[0090] In some possible implementations, the average particle size of the first mesoporous particles is higher than the average particle size of the second mesoporous particles. In this case, the first mesoporous particles with high particle size can be loaded onto the surface of the porous framework of the liquid storage material first, and the second mesoporous particles with small particle size can fill the sites not covered by the first mesoporous particles with large particle size. Moreover, when the first mesoporous particles with large particle size are preferentially loaded, their pore structure can provide physical support sites for the second mesoporous particles with small particle size, forming a three-dimensional hierarchical pore structure, providing more anchoring sites for the second mesoporous particles with small particle size, forming a mechanical interlocking structure, avoiding competitive adsorption, increasing the total loading capacity, and at the same time reducing the cross-diffusion of fragrance molecules in the blending system.

[0091] In some possible implementations, the average particle size of the first mesoporous particles is 1 μm to 10 μm. For example, the average particle size of the first mesoporous particles can be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, or any interval value between any two of the above typical but non-limiting point values. In this case, the mesoporous particles have a small particle size, which ensures that they can be loaded on the surface of the porous framework of the liquid storage substrate without blocking the surface pores of the liquid storage substrate, thus ensuring the liquid storage performance of the liquid storage substrate.

[0092] In some possible implementations, the average pore size of the first mesoporous particles is 5 nm to 10 nm. For example, the average pore size of the first mesoporous particles can be 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, or any interval value between any two of the above typical but non-limiting point values. In this case, the larger average pore size of the first mesoporous particles sufficiently ensures the loading of the macromolecular first fragrance, and through precise size matching and pore regulation, the preferential release of the macromolecular first fragrance is achieved.

[0093] In some possible implementations, the porosity of the first mesoporous particles is 40% to 60%. For example, the porosity of the first mesoporous particles can be 40%, 42%, 44%, 45%, 46%, 48%, 50%, 52%, 54%, 55%, 56%, 58%, 60%, or any interval value between any two of the above typical but non-limiting point values. In this case, the first mesoporous particles have a high porosity, which provides sufficient pore structure for the loading of the first fragrance, sufficiently ensures the loading efficiency of the first fragrance macromolecules, and improves the slow-release effect of the fragrance.

[0094] In some possible implementations, the mesoporous substrate of the first mesoporous particle is selected from at least one of SBA-15, KIT-6, FDU-12, CMK-3, CMK-5, CMK-8, MIL-101(Cr), MIL-100(Fe), UiO-66. These mesoporous substrates all have rich pore structures, and the pore size is favorable for loading the first fragrance of macromolecules. Among them, SBA-15 represents SBA-15 mesoporous silica, which is a two-dimensional hexagonal structure, has adjustable pore size, and has high specific surface area. KIT-6 represents KIT-6 mesoporous silica, which is a three-dimensional cubic structure and has double-continuous channels. FDU-12 represents FDU-12 mesoporous silica, which has a highly ordered two-dimensional hexagonal structure and uniform pore size. CMK-3, CMK-5, and CMK-8 are CMK series mesoporous carbons. MIL-101(Cr) represents chromium-based MIL-101 metal organic framework, which has large pores and is stable and high. MIL-100(Fe) represents iron-based MIL-100 metal organic framework, which has microporous-mesoporous dual pore structure and is stable to water. UiO-66 represents zirconium-based UiO-66 metal organic framework, which has high chemical stability (acid-resistant and heat-resistant).

[0095] In some embodiments, the mesoporous substrate of the first mesoporous particle is selected from SBA-15 mesoporous molecular sieve, which is a two-dimensional hexagonal structure, has pore walls, and has a pore size of 5 nm to 30 nm, and has excellent thermal stability (> 900°C). In some embodiments, the SBA-15 is prepared by co-assembly of a non-ionic surfactant (such as Pluronic P123) with a silicon source under strong acidic conditions to form a more stable micellar template.

[0096] In some possible implementations, the first fragrance has a molecular weight of 200 Da to 500 Da; wherein Dalton (Da) is an alias of atomic mass unit, 1 Da = 1 g / mol (gram per mole), which is used to represent the absolute molecular weight of a single molecule or polymer. For example, the molecular weight of the first fragrance can be 200 Da, 220 Da, 240 Da, 250 Da, 260 Da, 280 Da, 300 Da, 320 Da, 340 Da, 350 Da, 360 Da, 380 Da, 400 Da, 420 Da, 440 Da, 450 Da, 460 Da, 480 Da, 500 Da, and the like, which are typical but not limited to any point value or interval value between any two point values. In this case, the first fragrance has a large molecular weight, and the fragrance molecules are loaded into the first mesoporous particles, which can achieve the characteristics of high volatility, strong penetration, stable compatibility, long-lasting fragrance, and the like.

[0097] In some embodiments, the first fragrance has a molecular weight of 250 Da to 400 Da, which is more favorable for loading into the first mesoporous particles.

[0098] In some possible implementation ways, the first essence includes at least one of ambergris derivative, sclareolide, acetylated cedrene, butter, caramel. Among them, the ambergris derivative, the sclareolide and the acetylated cedrene belong to wood essence, which can improve the unique flavor of the aerosol, and the butter and the caramel can improve the taste of the aerosol.

[0099] In some possible implementation ways, the mass ratio of the first mesoporous particle to the first essence is 100%: (50%-80%). For example, the mass ratio of the first mesoporous particle to the first essence can be 100%:50%, 100%:55%, 100%:60%, 100%:65%, 100%:70%, 100%:75%, 100%:80%, or any interval value between any two point values. In this case, the loading amount of the first essence in the first mesoporous particle, which takes into account the high drug loading, stable and slow release and process feasibility, is one of the core parameters for realizing the preferential release of the first essence of the large molecule in the post-regulation. The first essence of the large molecule loaded in the first mesoporous particle can enrich the aroma and taste of the aerosol, while ensuring that the first essence of the large molecule can be released preferentially to the second essence of the small molecule, so as to achieve accurate exchange of the order of aroma and taste in the aerosol. In specific embodiments, different essence molecule categories need to be accurately controlled in terms of mesoporous material selection and process, so as to ensure the taste exchange effect.

[0100] In some possible implementation ways, the average particle size of the second mesoporous particle is 0.5-5 μm. For example, the average particle size of the second mesoporous particle can be 0.5 μm, 0.8 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, or any interval value between any two point values. In this case, the particle size of the mesoporous particle is small, which ensures that it can be loaded on the surface of the porous framework of the liquid storage substrate, rather than blocking the surface pores of the liquid storage substrate, so as to ensure the liquid storage performance of the liquid storage substrate.

[0101] In some possible implementation ways, the average pore size of the second mesoporous particle is 2-4 nm. For example, the average pore size of the second mesoporous particle can be 2 nm, 2.5 nm, 3 nm, 3.5 nm, 4 nm, 4.5 nm, or any interval value between any two point values. In this case, the small pore size of the second mesoporous particle has a better confinement effect on the second essence of the small molecule, which can delay the release of the second essence of the small molecule and improve the taste hierarchy of the aerosol.

[0102] In some possible implementations, the second mesoporous particle has a porosity of 50% to 70%. For example, the second mesoporous particle can have a porosity of 50%, 52%, 54%, 55%, 56%, 58%, 60%, 62%, 64%, 65%, 66%, 68%, 70%, or any other typical but non-limiting value or interval value between any two of the above values. In this case, the second mesoporous particle has a high porosity, which provides sufficient pore structure for loading of the second fragrance, fully ensures the loading efficiency of the small-molecule second fragrance, delays the release of the small-molecule second fragrance, and realizes precise regulation of the fragrance release sequence.

[0103] In some possible implementations, the mesoporous substrate of the second mesoporous particle is selected from at least one of MCM-41, NH2-MCM-41, and Al-MCM-41. MCM is the abbreviation of Mobile Crystalline Materials (developed by Mobil Oil Company), and the number represents a specific structural model. MCM-41 includes waste glass-based MCM-41; NH2-MCM-41 represents an amino-modified MCM-41 or an amino-functionalized MCM-41; and Al-MCM-41 represents an aluminum-doped MCM-41 or an aluminum-substituted MCM-41. These mesoporous substrates all have rich pore structures, and the pore size is suitable for loading of the small-molecule second fragrance.

[0104] In some possible implementations, the mesoporous substrate of the second mesoporous particle is selected from MCM-41 ordered mesoporous material, which has two-dimensional hexagonal ordered mesopores (p6mm space group), a pore size of 2-10 nm, and thin pore walls (about 1 nm), and is also known as hexagonal mesoporous silica. In some embodiments, the MCM-41 ordered mesoporous material can be formed by self-assembly of cationic surfactants (such as CTAB) and silicate anions under alkaline conditions to form a liquid crystal template, and then the mesoporous structure is obtained by removing the template by calcination.

[0105] In some possible implementations, the second flavor has a molecular weight of 70 Da to 250 Da, and the first flavor has a molecular weight greater than that of the second flavor; wherein Dalton (Da) is an alternative name for the unit of atomic mass, 1 Da = 1 g / mol (gram per mole), which is used to express the absolute molecular weight of a single molecule or polymer. For example, the second flavor can have a molecular weight of 70 Da, 80 Da, 90 Da, 100 Da, 110 Da, 120 Da, 130 Da, 140 Da, 150 Da, 160 Da, 170 Da, 180 Da, 190 Da, 200 Da, 210 Da, 220 Da, 230 Da, 240 Da, 250 Da, or any interval value between any two of the above typical but non-limiting point values. In this case, the second flavor has a higher volatility relative to the first flavor, which is a large molecule, and is more easily vaporized during heating. Loading the second flavor with a small molecular weight into the second mesoporous particle can delay the release rate of the small molecule second flavor by the confinement effect of the small pore size in the mesoporous particle and the packaging effect of the carrier material, so as to accurately exchange the order of the flavor in the aerosol, and facilitate the diversification of the taste of the aerosol.

[0106] In some embodiments, the second flavor has a molecular weight of 100 Da to 200 Da, which is more conducive to being loaded into the second mesoporous particle and delaying the release of the second flavor.

[0107] In some possible implementations, the second flavor includes at least one of a berry flavor, a fruit flavor, a floral flavor, a vanilla flavor, and a liquor flavor. These flavors can all enhance the taste of the aerosol generated by the aerosol generating substrate and enrich the layers of the aerosol. By compounding multiple flavors, a variety of flavors can be produced to meet the individual needs of users for taste, throat feel, and aftertaste. The berry flavor includes blueberry flavor (sour and sweet fruit flavor with a slight tannin astringency, often combined with mint and nut flavors), strawberry flavor (fresh and sweet, with a milk flavor bottom note that can simulate a "strawberry cream" flavor), raspberry flavor (high acidity with a unique "raspberry" fragrance, suitable for mixed berry formulations), blackberry / blackcurrant flavor (deep, rich, and full-bodied), and the like. The fruit flavor includes citrus (for example, lemon flavor, orange flavor, orange flavor, and the like), tropical fruit (for example, mango flavor, pineapple flavor, coconut flavor, and the like), stone fruit (for example, peach flavor, cherry flavor, and the like), and the like. The vanilla flavor includes mint flavor, vanilla flavor, and the like. The liquor flavor includes whiskey flavor, brandy flavor, rum flavor, champagne flavor, and the like.

[0108] In some possible implementations, the mass ratio of the second mesoporous particles to the second fragrance is 100%: (15%~25%). Exemplarily, the mass ratio of the second mesoporous particles to the second fragrance can be 100%:15%, 100%:16%, 100%:17%, 100%:18%, 100%:19%, 100%:20%, 100%:21%, 100%:22%, 100%:23%, 100%:24%, 100%:25%, or an interval value between any two point values of the above exemplary but non-limiting point values. In this case, the loading amount of the small-molecule second fragrance in the second mesoporous particles sufficiently ensures the confinement of the mesoporous substrate to the fragrance, so that the small-molecule second fragrance is more stably loaded in the second mesoporous particles, the release rate of the small-molecule second fragrance is better delayed, the release of the large-molecule first fragrance is ensured to be preferential, the order of the fragrance taste in the aerosol is accurately exchanged, the aerosol taste is enriched, and diversification is achieved.

[0109] It should be noted that in the above embodiments of the present application, the measurement method of the porosity and the average pore diameter of the liquid storage substrate and the mesoporous particles is in accordance with GB / T 21650 "Pore Size Distribution and Porosity of Solid Materials by Mercury Porosimetry and Gas Adsorption". The measurement method of the density of the liquid storage substrate is as follows: 5 pieces of the liquid storage substrate are taken, placed in a drying oven at 80℃±2℃, baked for 30 min, and then taken out; the dry empty weight of the sample is weighed and marked as M1; the dry empty weight sample is placed in a measuring cup filled with water; the measuring cup is placed in a water tank and vacuumed for 5 min; the saturated water weight of the sample is weighed and marked as M2; the saturated empty weight of the sample is weighed after wiping off the water residues on the surface of the sample, and marked as M3, and attention should be paid to avoid excessive water absorption to cause inaccurate measurement; the density D=M1 / (M3-M2) is calculated.

[0110] In some possible implementations, the mass ratio of the first mesoporous particles to the second mesoporous particles loaded in the liquid storage substrate is (3~5):1. Exemplarily, the mass ratio of the first mesoporous particles to the second mesoporous particles loaded in the liquid storage substrate can be 3:1, 3.5:1, 4:1, 4.5:1, 5:1, or an interval value between any two point values of the above exemplary but non-limiting point values. In this case, the loading amount of the first mesoporous particles in the liquid storage substrate is higher than that of the second mesoporous particles, which ensures that the large-molecule first fragrance in the high-loading first mesoporous particles is preferentially released, the order of the fragrance taste in the aerosol is accurately exchanged, the aerosol taste is enriched, and diversification is achieved.

[0111] In some possible implementations, the porous framework surface of the liquid storage substrate is modified with an adhesion layer, the adhesion layer is grafted with a coupling agent on the surface away from the liquid storage substrate, and the first mesoporous particles and the second mesoporous particles are loaded onto the surface of the liquid storage substrate through the adhesion layer and the coupling agent. In this case, by modifying the porous framework surface of the liquid storage substrate, the porous framework surface is modified with an adhesion layer, and the coupling agent is grafted on the surface of the adhesion layer. Through the modified adhesion layer and the coupling agent, the first mesoporous particles and the second mesoporous particles can be more stably loaded onto the surface of the liquid storage substrate. The adhesion layer is rich in active groups such as amino groups (-NH2) and hydroxyl groups (-OH), which can directly adsorb mesoporous particles through electrostatic interaction and hydrogen bonding. However, the binding force is weak, and it is difficult to maintain the stable loading of mesoporous materials during subsequent cleaning and high-temperature drying. Therefore, the covalent bond of the coupling agent is combined to form a stable chemical bond of “liquid storage material-adhesion layer-coupling agent-mesoporous particle” through the hydrolysis and condensation reaction of the coupling agent, thereby enhancing the binding strength.

[0112] In some possible implementations, the adhesion layer includes at least one adhesion polymer of polydopamine, tannin polymer, catechol polymer, gallic acid polymer, and catecholamine polymer. These adhesion polymers all have high adhesion to mesoporous particles, and these adhesion polymers contain polar active groups such as amino groups (-NH2) and hydroxyl groups (-OH), which can directly adsorb mesoporous particles through electrostatic interaction and hydrogen bonding. In addition, these polar active groups also provide active sites for subsequent condensation of the coupling agent, and their hydrophilicity also promotes the interface wetting of the hydrolysis reaction.

[0113] In some embodiments, the connection between the liquid storage substrate and the surface modified with the adhesion layer mainly relies on covalent bonds, hydrogen bonds, π-π stacking, and van der Waals forces. For example, the liquid storage substrate is polyethylene terephthalate PET, and the adhesion layer is polydopamine PDA. A C-N or C-O covalent bond is formed through a Michael addition reaction; a C=N covalent bond is formed through a Schiff base reaction. The catechol hydroxyl group (-OH) of the polydopamine PDA forms a hydrogen bond network with the oxygen atom in the ester group of the polyethylene terephthalate PET. In addition, the benzene ring of the polyethylene terephthalate PET interacts with the aromatic quinone structure of the polydopamine PDA through π electron clouds. At the same time, the polydopamine adhesion layer and the polyethylene terephthalate PET surface also have physical adsorption of van der Waals forces.

[0114] In some possible implementations, the adhesion polymer in the adhesion layer is combined with a coordination ion. In this case, the adhesion polymer is combined with a coordination ion, and a three-dimensional network structure is formed by complexing different adhesion polymer molecules through the coordination ion, which can significantly enhance the mechanical strength and cohesion of the adhesion layer. Limiting the movement of polymer chain segments in the adhesion layer can reduce the risk of adhesion layer swelling and falling off.

[0115] In some possible implementations, the coordination ions include at least one of metal ions in iron ions, copper ions, lithium ions, silver ions. These metal ions can coordinate with active groups in the adhesion layer to form stable complexes and three-dimensional network structures, enhancing the mechanical strength and cohesion of the adhesion layer.

[0116] For example, the adhesion layer is taken as polydopamine, which is formed by oxidative polymerization of dopamine and rich in catechol groups and amino groups (-NH2) in the molecular structure, can coordinate with metal ions such as iron ions, copper ions, lithium ions, silver ions to form stable six-coordination complexes. Moreover, a single metal ion such as iron ion, copper ion, lithium ion, silver ion can be combined with multiple phenolic hydroxyl groups of polydopamine chains to form a three-dimensional network structure, significantly enhancing the mechanical strength and cohesion of the adhesion layer. In addition, -NH2 in polydopamine can form part of the Schiff base bond (C=N) with metal ions such as Fe 3+ , further solidifying the network structure, limiting the movement of polydopamine chain segments, and reducing the swelling and shedding of the polydopamine adhesion layer.

[0117] In some possible implementations, the coordination ions include at least one of borate ions and ionic metal organic frameworks. In this case, the borate ions and ionic metal organic frameworks as coordination ions can form complexes with adhesion-like polymers through coordination bonds, hydrogen bonds or host-guest interactions. Among them, the boron atom in boronic acid has an empty p orbital, which can react with groups containing ortho-dihydroxyl groups (such as catechol, glucose units) or cis-diol structures in the polymer to form dynamic covalent bonds: boronic acid molecules or with hydroxyl groups, amino groups in the polymer form a hydrogen bond network, enhancing the mechanical properties of the material. Metal ions (such as Zn 2+ , Zr 4+ , Fe 3+ , etc.) in ionic metal organic frameworks MOFs can coordinate with carboxylic acid (-COOH), amino (-NH2), hydroxyl (-OH) and other groups on the adhesion-like polymer chain to form stable complexes.

[0118] In some possible implementations, the thickness of the adhesion layer is 100 nm to 300 nm. For example, the thickness of the adhesion layer can be 100 nm, 120 nm, 140 nm, 150 nm, 160 nm, 180 nm, 200 nm, 220 nm, 240 nm, 250 nm, 260 nm, 280 nm, 300 nm, etc. Typical but non-limiting point values or interval values between any two point values. In this case, the thickness of the adhesion layer sufficiently ensures sufficient binding sites for mesoporous particle loading while avoiding the reduction of the porosity of the liquid storage substrate.

[0119] In some possible implementations, the coupling agent includes at least one of γ-aminopropyl triethoxysilane (KH550), N-aminoethyl-γ-aminopropyl trimethoxysilane (KH-792), γ-glycidoxypropyl trimethoxysilane (KH-560), γ-methacryloyloxypropyl trimethoxysilane (KH-570), a titanate coupling agent (such as NDZ-101), and a zirconate coupling agent. The silanol (-SiOH) generated by hydrolysis of these coupling agents can condense with the silicon hydroxyl (Si-OH) on the surface of the mesoporous particles to form Si-O-Si covalent bonds, thereby stably loading the mesoporous particles on the surface of the liquid storage substrate. In addition, the silanol (-SiOH) can condense with active groups such as amino groups (-NH2) or hydroxyl groups (-OH) in the adhesion layer to form Si-O-C / N bonds. Furthermore, the coupling agent has active groups such as amino groups, which can react with quinone groups in the adhesion layer to form amino linkages, thereby stably bridging the adhesion layer and the mesoporous particles.

[0120] In some embodiments, a schematic diagram of the surface microstructure of the liquid storage material provided by the embodiments of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, the surface of the liquid storage substrate is modified with an adhesion layer and a coupling agent, and the first mesoporous particles loaded with the first fragrance and the second mesoporous particles loaded with the second fragrance are loaded on the surface of the liquid storage substrate through the modified adhesion layer and the coupling agent.

[0121] In some embodiments, in order to better control the order of the fragrance in the aerosol and make the after-regulation macromolecular fragrance be released preferentially, the liquid storage material provided by the embodiments of the present application can also be combined with the aerosol generating substrate. In this case, on the one hand, the after-regulation macromolecular fragrance can be released preferentially, and the user can experience the taste of the after-regulation macromolecular fragrance in the early stage of use, thereby achieving flexible control of the order of the fragrance in the aerosol. On the other hand, the aerosol generating substrate with only the after-regulation macromolecular fragrance, in combination with the liquid storage material provided by the embodiments of the present application, can better achieve the effect of long-lasting release of the fragrance. On the other hand, through flexible control of the concentration of the after-regulation macromolecular fragrance in the aerosol generating substrate and the control of the loading amount of the fragrance in the liquid storage material, the concentration of the fragrance in the aerosol can be flexibly controlled, which is convenient to apply and has wide practicality.

[0122] The liquid storage material provided by the above embodiments of the present application can be prepared by the following embodiment method.

[0123] In a second aspect, the embodiments of the present application provide a preparation method of a liquid storage material, as shown in FIG. 2, which includes the following steps: Figure 3 S10. preparing first mesoporous particles loaded with a first fragrance;​ S20. preparing second mesoporous particles loaded with a second fragrance; the average pore size of the first mesoporous particles is larger than that of the second mesoporous particles, and the molecular weight of the first fragrance is higher than that of the second fragrance; S30. obtaining a liquid storage substrate with a porous structure, and loading the first mesoporous particles and the second mesoporous particles at least on the surface of the porous framework of the liquid storage substrate to obtain a liquid storage material.

[0124] The preparation method of the liquid storage material of the embodiment of the application includes the following steps: preparing first mesoporous particles loaded with a first fragrance and second mesoporous particles loaded with a second fragrance, and loading the first mesoporous particles and the second mesoporous particles at least on the surface of the porous framework of the liquid storage substrate. The average pore size of the first mesoporous particles is relatively large, and the corresponding specific surface area is relatively small, which leads to weak confinement of the pores in the mesoporous particles to the first fragrance with a large molecular weight and weak adsorption. The average pore size of the second mesoporous particles is small, and the corresponding specific surface area is large, which leads to strong confinement of the pores in the mesoporous particles to the second fragrance with a small molecular weight and strong adsorption. Therefore, by loading the first mesoporous particles and the second mesoporous particles to the first fragrance with a large molecular weight and the second fragrance with a small molecular weight respectively, the first fragrance with a large molecular weight is released and vaporized preferentially in the heating process of the liquid storage material, and the release and vaporization of the second fragrance with a small molecular weight are delayed, so that the second fragrance with a small molecular weight originally belonging to the front note is released later, and the first fragrance with a large molecular weight originally belonging to the rear note is released preferentially, which realizes precise control of the order of the flavor in the aerosol and gives the liquid storage material the characteristic of precise control of the release kinetics of the fragrance.

[0125] In the step S10, the first mesoporous substrate is prepared by the following steps: In some possible implementations, the step of preparing the first mesoporous particles includes: dispersing the first mesoporous substrate and the first fragrance in a solvent, filling the first fragrance into the pores of the first mesoporous substrate by a vacuum impregnation method, and cleaning and drying to obtain the first mesoporous particles. In the preparation process, the first mesoporous substrate and the first fragrance are mixed uniformly in the solvent, and then the first fragrance is filled into the pores of the first mesoporous substrate by the vacuum impregnation method. To ensure the stability of the directional loading and slow release of the fragrance, the surface of the mesoporous substrate is cleaned and dried with a solvent to remove free mesoporous materials and fragrances.

[0126] The first mesoporous particles prepared by the embodiments of the present application are loaded with the first fragrance in the first mesoporous substrate, mainly by physical adsorption, without chemical reaction, without introducing covalent bond or ion bond formation reaction. Physical adsorption is mainly achieved by capillary action, pore filling and weak hydrogen bond action of the hydroxyl groups on the surface of the mesoporous substrate. The capillary action and pore filling refer to the size matching of the larger pore size of the first mesoporous substrate and the size of the first fragrance molecules, so that the first fragrance molecules are adsorbed into the pores under negative pressure by vacuum impregnation, and physical adsorption is completed by capillary force and van der Waals force generated by transient dipole induction between molecules. The weak hydrogen bond action of the hydroxyl groups on the surface of the mesoporous substrate refers to the fact that the surface of the mesoporous substrate (such as SBA-15) is rich in silicon hydroxyl groups (-Si-OH), which can form hydrogen bonds with the polar groups of the fragrance molecules.

[0127] In some possible implementations, the average particle size of the first mesoporous particles is 1 μm to 10 μm; the average pore size of the first mesoporous particles is 5 nm to 10 nm; and the porosity of the first mesoporous particles is 40% to 60%. In this case, the first mesoporous particles have a small particle size, which ensures that they can be loaded on the surface of the porous framework of the liquid storage substrate; have a high porosity, which provides sufficient pore structure for the loading of the first fragrance; and have a large average pore size, which fully ensures the loading of the macromolecular first fragrance and is conducive to the preferential release of the macromolecular second fragrance.

[0128] In some possible implementations, the first mesoporous substrate is selected from at least one of SBA-15, KIT-6, FDU-12, CMK-3, CMK-5, CMK-8, MIL-101(Cr), MIL-100(Fe), and UiO-66; these mesoporous substrates all have abundant pore structures and pore sizes suitable for the loading of macromolecular first fragrances.

[0129] In some possible implementations, the molecular weight of the first fragrance is 200 Da to 500 Da; in this case, the first fragrance has a large molecular weight and can be loaded in the large pores of the first mesoporous particles.

[0130] In some possible implementations, the first fragrance includes at least one of amber derivative, sclareolide, acetylated cedrene, butter, and caramel.

[0131] In some possible implementations, the mass ratio of the first mesoporous particles to the first fragrance is 100%: (50% to 80%); in this case, the loading amount of the first fragrance takes into account high drug loading, stable and slow release, and process feasibility.

[0132] In some embodiments, the step of preparing the first mesoporous particles comprises: mixing the first mesoporous substrate with a first flavoring agent (e.g., caramel aldehyde) of large molecules, treating by vacuum impregnation (for example, under the conditions of a vacuum degree of 0.08 MPa to 0.1 MPa and a temperature of 40°C to 50°C) for 2 to 3 hours, and adsorbing the first flavoring agent of large molecules into the pores of the first mesoporous substrate by Van der Waals forces and capillary action. Then, the surface free flavoring agent is removed by washing with n-hexane, and vacuum drying at 60°C for 2 hours to obtain the first mesoporous particles loaded with the first flavoring agent.

[0133] In the above step S20: In some possible implementations, the step of preparing the second mesoporous particles comprises: preparing an inclusion complex powder of the second flavoring agent and a carrier material having a molecular cavity, dispersing the inclusion complex powder and the second mesoporous substrate in a solvent, filling the inclusion complex powder into the pores of the second mesoporous substrate by vacuum impregnation, and cleaning and drying to obtain the second mesoporous particles. In the preparation process, the volatility of the second flavoring agent of small molecules is reduced by the inclusion effect of the carrier material. Specifically, after the second flavoring agent of small molecules is adsorbed into the second mesoporous substrate of small pore size after being prepared into an inclusion complex with the carrier material, the release rate of the second flavoring agent of small molecules can be better delayed, the second flavoring agent of small molecules originally released later is released later, and the first flavoring agent of large molecules originally released later is released first, so as to achieve the directional loading and slow release of the second flavoring agent of small molecules, and better realize the precise control of the order of flavoring taste. In order to ensure the stability of the directional loading and slow release of the second flavoring agent of small molecules, the surface of the second mesoporous substrate is ultrasonically cleaned with a solvent and dried to remove free flavoring agents, mesoporous materials and carrier materials.

[0134] In some possible implementations, the carrier material comprises at least one of β-cyclodextrin, α-cyclodextrin, γ-cyclodextrin, calixarene, dendrimer, and metal-organic framework; these carrier materials all have a molecular cavity structure, and can pack the second flavoring agent into the cavity of the carrier material by non-covalent interaction (such as hydrogen bond, Van der Waals force, π-π stacking, and hydrophobic effect), so as to delay the release rate of the second flavoring agent of small molecules.

[0135] In some possible implementations, the molar ratio of the second flavoring agent to the carrier material is 1: (1-1.2). In this case, the second flavoring agent can be sufficiently packed into the molecular cavity of the carrier material.

[0136] In some possible implementation manners, the average particle size of the second mesoporous particle is 0.5 μm to 5 μm; the average pore size of the second mesoporous particle is 2 nm to 4 nm; and the porosity of the second mesoporous particle is 50% to 70%. In this case, the particle size of the mesoporous particle is small, which ensures that the mesoporous particle can be loaded on the surface of the porous framework of the liquid storage base material; the second mesoporous particle has a high porosity, which provides sufficient pore structure for loading of the second fragrance, and fully ensures the loading efficiency of the small-molecule second fragrance; the pore size of the second mesoporous particle is small, which has a better confinement effect on the small-molecule second fragrance, and can delay the release of the small-molecule second fragrance.

[0137] In some possible implementation manners, the second mesoporous base material is selected from at least one of MCM-41, NH2-MCM-41, and Al-MCM-41; these mesoporous base materials all have rich pore structures, and the pore size is favorable for loading of the small-molecule second fragrance.

[0138] In some possible implementation manners, the molecular weight of the second fragrance is 70 Da to 250 Da; in this case, it is favorable for loading into the second mesoporous particle, and the release of the second fragrance is delayed.

[0139] In some possible implementation manners, the second fragrance includes at least one of berry fragrance, fruity fragrance, floral fragrance, vanilla flavor fragrance, and wine fragrance. These fragrances can all improve the taste of the aerosol generated by the aerosol generating substrate, and enrich the layering of the aerosol.

[0140] In some possible implementation manners, the mass ratio of the second mesoporous particle to the second fragrance is 100%: (15% to 25%). In this case, the loading amount of the small-molecule second fragrance in the second mesoporous particle fully ensures the confinement effect of the mesoporous base material on the fragrance, so that the small-molecule second fragrance is more stably loaded in the second mesoporous particle, and the release rate of the small-molecule second fragrance is better delayed.

[0141] In some embodiments, the step of preparing the second mesoporous particle includes: forming an inclusion compound of the pre-adjusted small-molecule second fragrance (such as menthol) and a carrier material (such as β-cyclodextrin) (the hydrophobic cavity of the β-cyclodextrin inclusion menthol molecules through van der Waals force and hydrogen bond, reducing the volatility thereof), and grinding the inclusion compound into a powder after freeze-drying. Then, the inclusion compound is mixed with a small-pore second mesoporous base material (such as MCM-41), and vacuum impregnation (for example, under the conditions of a vacuum degree of 0.08 MPa to 0.1 MPa and a temperature of 40°C to 50°C) is performed for 1 hour, so that the inclusion compound is adsorbed into the small-pore second mesoporous base material, to obtain the second mesoporous particle loaded with the second fragrance.

[0142] In the above step S30, the second mesoporous particle loaded with the second fragrance is obtained. In some possible implementations, the material in the liquid storage substrate includes at least one of polyethylene terephthalate, polyamide, polypropylene, and polyethylene. The liquid storage substrate made of these polymer materials can improve the liquid conductivity, chemical stability, temperature resistance, sealing property, safety, and other properties of the liquid storage substrate.

[0143] In some possible implementations, the porosity of the liquid storage substrate is 90% to 96%, and the density of the liquid storage substrate is 0.05 g / cm 3 ~0.1 g / cm 3 In this case, the liquid storage substrate with high porosity and low density has strong capillary action, and the aerosol generating substrate can quickly penetrate to the heating element through the capillary action.

[0144] In some possible implementations, the liquid storage substrate is immersed in anhydrous ethanol for 12 to 24 hours, and then washed with distilled water and dried (for example, the drying condition is 60°C to 80°C, and the drying time is 2 to 4 hours), to remove the residual organic pollutants on the surface and improve the efficiency of the subsequent modification reaction.

[0145] In some possible implementations, before the first mesoporous particles and the second mesoporous particles are loaded on the surface of the porous framework of the liquid storage substrate, the liquid storage substrate is modified as follows: S31. Modifying an adhesion layer on the surface of the porous framework of the liquid storage substrate; enhancing the hydrophilicity and the subsequent loading capacity of the mesoporous particles.

[0146] S32. Grafting a coupling agent on the surface of the adhesion layer to obtain a modified substrate.

[0147] By modifying the surface of the porous framework of the liquid storage substrate, the surface of the porous framework is modified with an adhesion layer, and a coupling agent is grafted on the surface of the adhesion layer. The adhesion layer is rich in active groups, which can directly adsorb mesoporous particles through electrostatic action and hydrogen bonds. However, the binding force is weak, and the stable loading of mesoporous materials cannot be maintained during subsequent cleaning and high-temperature drying. The covalent bond of the coupling agent is bridged, and the hydrolysis and condensation reaction of the coupling agent occurs, forming a stable chemical bond of “liquid storage material-adhesion layer-coupling agent-mesoporous particle”, and enhancing the binding strength.

[0148] In some possible implementations, the preparation step of the adhesion layer includes: immersing the liquid storage substrate in a solution of adhesion monomers, and polymerizing the adhesion monomers on the surface of the porous framework of the liquid storage substrate to form an adhesion polymer, to obtain the adhesion layer.

[0149] In some possible implementation manners, the adhesion monomer includes at least one of dopamine, tannic acid, catechol, gallic acid, and catecholamine. The adhesion monomers are sequentially polymerized to form adhesion polymers such as polydopamine, tannic acid polymer, catechol polymer, gallic acid polymer, and catecholamine polymer, and form the adhesion layer on the surface of the liquid storage substrate. The adhesion polymers have high adhesion to the mesoporous particles, and the adhesion polymers contain polar active groups such as amino groups (-NH2) and hydroxyl groups (-OH), which can directly adsorb the mesoporous particles through electrostatic attraction and hydrogen bonds. In addition, the polar active groups provide active sites for subsequent condensation of coupling agents, and the hydrophilicity of the polar active groups promotes the wetting of the hydrolysis reaction interface.

[0150] In some possible implementation manners, the solution of the adhesion monomer further contains a coordination material, and the coordination material is coordinated with the adhesion polymer to form a complex. The complex, also known as a coordination compound, is a compound formed by a central metal ion or atom and surrounding ligands through coordination bonds. In the embodiments of the present application, the metal ion or atom provided by the coordination material is the central point, and the adhesion polymer is the surrounding ligand, and the compound is formed through coordination bonds. In this case, the mechanical strength and cohesion of the adhesion layer can be significantly enhanced. The movement of the polymer chain segments in the adhesion layer is limited, and the risk of swelling and peeling of the adhesion layer is reduced.

[0151] In some possible implementation manners, the coordination material includes at least one metal salt of iron salt, copper salt, lithium salt, and silver salt; and / or, the coordination material includes at least one of boric acid and ionic metal organic framework. The metal ion in the metal salt can be coordinated with the active group in the adhesion layer to form a stable complex and a three-dimensional network structure. The boric acid ion and the ionic metal organic framework as the coordination ion can form a complex with the adhesion polymer through coordination bonds, hydrogen bonds, or host-guest interactions, thereby enhancing the mechanical strength and cohesion of the adhesion layer.

[0152] For example, the coordination material can be iron sulfate, ammonium iron sulfate, copper chloride, Fe3O4 nanoparticles, boric acid, metal organic framework loaded with Fe 3+ or other metal ions, and the like.

[0153] In some possible implementation manners, the concentration of the adhesion monomer in the solution of the adhesion monomer is 2.0 g / L to 3.0 g / L. Exemplarily, the concentration of the adhesion monomer in the solution of the adhesion monomer can be 2 g / L, 2.1 g / L, 2.2 g / L, 2.3 g / L, 2.4 g / L, 2.5 g / L, 2.6 g / L, 2.7 g / L, 2.8 g / L, 2.9 g / L, 3.0 g / L, or any interval value between any two point values of the foregoing exemplary but non-limiting point values. In this case, the concentration of the adhesion monomer sufficiently ensures that the adhesion layer formed has a suitable thickness, avoids that the adhesion layer formed is too thin or discontinuous when the concentration is too low, and causes uneven loading of the mesoporous particles subsequently; meanwhile, avoids that polymer suspension particles are formed when the concentration is too high, causes the surface of the adhesion layer to be rough, and reduces the orderliness of the loading of the mesoporous particles subsequently.

[0154] In some possible implementation manners, the concentration of the coordination material in the solution of the adhesion monomer is 0.5 g / L to 0.6 g / L. Exemplarily, the concentration of the coordination material in the solution of the adhesion monomer can be 0.5 g / L, 0.51 g / L, 0.52 g / L, 0.53 g / L, 0.54 g / L, 0.55 g / L, 0.56 g / L, 0.57 g / L, 0.58 g / L, 0.59 g / L, 0.6 g / L, or any interval value between any two point values of the foregoing exemplary but non-limiting point values. In this case, the concentration of the coordination material can sufficiently ensure that the adhesion monomer and the coordination material are coordinated to form a complex and a three-dimensional network structure, and improve the stability of the adhesion layer, and avoid that excessive coordination material affects the flexibility of the adhesion layer and the stability of the fragrance molecules loaded subsequently.

[0155] In some possible implementation manners, the thickness of the adhesion layer is 100 nm to 300 nm. In this case, the thickness of the adhesion layer sufficiently ensures that sufficient binding sites are provided for loading of the mesoporous particles, and meanwhile avoids reduction of the porosity of the liquid storage substrate.

[0156] In some embodiments, the step of modifying the reservoir substrate includes: immersing the reservoir substrate in a dopamine aqueous solution (pH = 8.5, concentration 2.0-3.0 g / L, stirring at 80°C for 4 hours), forming a polydopamine (PDA) adhesion layer on the surface of the reservoir substrate, enhancing the hydrophilicity and subsequent loading capacity of mesoporous materials. Add ferric chloride (FeCl3) (0.5-0.6 g / L) to the dopamine solution (pH = 5-6) for 10-15 minutes, supplement cross-linking by ion diffusion, form a phenol-iron cross-linking network, and improve the stability of the adhesion layer. When the concentration of the dopamine aqueous solution is less than 2.0 g / L, the adhesion layer is too thin or discontinuous, resulting in uneven loading of subsequent mesoporous particles and failure of the layered structure. 2.0 g / L is the minimum effective concentration of dopamine at 80°C to form a uniform adhesion layer (adsorbed on the PET surface through van der Waals forces and π-π stacking); when it is higher than 3.0 g / L, the self-polymerization rate of dopamine is too fast, and a PDA particle suspension is easily formed instead of a uniform adhesion layer, resulting in a rough surface, reducing the directionality of mesoporous material loading, and excessive dopamine will waste reagents and increase the difficulty of subsequent cleaning. 0.5-0.6 g / L FeCl3 is the optimized range of the stoichiometric ratio of iron ions to PDA. When it is lower than 0.5 g / L, the cross-linking is insufficient, and the adhesion layer is easily peeled off during subsequent toluene / ethanol cleaning or high-temperature drying; when it is higher than 0.6 g / L: excessive Fe 3+ may cause excessive cross-linking of PDA, making the adhesion layer brittle, affecting the flexibility of the reservoir substrate, and the residual iron ions may catalyze the oxidation of fragrances (such as the oxidation of the aldehyde group of caramel aldehyde to carboxylic acid). The PDA formed by polymerization at pH = 8.5 is rich in o-diphenol and amino groups, which can coordinate with Fe 3+ highly at pH = 5-6, forming stable phenol-iron complexes (such as [Fe(C6H4O2)2] 2- ), and at the same time, before the coupling agent and mesoporous particle loading, the mechanical strength and solvent resistance of the PDA adhesion layer are enhanced through the phenol-iron network to avoid peeling of the adhesion layer in subsequent steps. In the above embodiments of the present application, the polydopamine is formed by oxidative polymerization of dopamine, and its molecular structure is rich in o-diphenol groups and amino groups (-NH2). When FeCl3 is added, Fe 3+ occurs metal-phenol coordination with the o-diphenol oxygen atoms in PDA, forming a stable six-coordinate complex. A single Fe 3+ can bind to multiple phenolic hydroxyl groups of PDA chains at the same time, forming a three-dimensional network structure, significantly enhancing the mechanical strength and cohesion of the adhesion layer, limiting the movement of PDA chain segments, reducing the swelling and shedding of the dopamine adhesion layer. In addition, -NH2 in PDA 3+ may form part of the Schiff base bond (C=N), further solidifying the network structure. And Fe 3+The metal-phenol coordination cross-linking network formed by the phenolic hydroxyl group of PDA inhibits the oxidative degradation of PDA, shields the hydrophilic group, and enhances the hydrolysis resistance.

[0157] S32. Grafting a coupling agent on the surface of the adhesion layer to obtain a modified substrate.

[0158] In some possible implementation manners, the step of grafting the coupling agent on the surface of the adhesion layer comprises: immersing the adhesion layer modified substrate in a solution of the coupling agent, and grafting the coupling agent on the surface of the adhesion layer through hydrolysis and polycondensation reaction to obtain the modified substrate.

[0159] In some possible implementation manners, the coupling agent comprises at least one of γ-aminopropyl triethoxysilane, N-aminoethyl-γ-aminopropyl trimethoxysilane, γ-glycidyl ether propyl trimethoxysilane, γ-methacryloyloxy propyl trimethoxysilane, a titanate coupling agent, and a zirconate coupling agent. These coupling agents can all hydrolyze to form silanol groups -Si(OH)3, can be covalently bonded to the adhesion layer such as polydopamine (PDA), and contain active groups such as -NH2, which can be combined with the mesoporous particles.

[0160] In some possible implementation manners, the volume percentage of the coupling agent in the solution of the coupling agent is 5% to 10%. For example, the volume percentage of the coupling agent in the solution of the coupling agent can be 5%, 6%, 7%, 8%, 9%, 10%, or any other typical but non-limiting point value or interval value between any two point values. In this case, the solution of the coupling agent can complete the coupling at room temperature, can avoid excessive reaction and self-condensation to block the pores, and can ensure that the surface of the adhesion layer is fully grafted and covered with the coupling agent to provide sufficient coupling sites for subsequent loading of the mesoporous particles.

[0161] In some embodiments, the polydopamine PDA modified reservoir substrate is immersed in a silane coupling agent APTES / ethanol solution for 30 minutes (concentration 5%~10% v / v, pH=5~6, wherein 5% concentration is the lowest threshold to ensure that the PDA-adhered layer of the reservoir substrate surface is fully covered by APTES, below which the coupling sites are insufficient, the mesoporous material loading is low, and the hierarchical structure may fail; excessive APTES not only forms useless siloxane oligomers (Si-O-Si), but also can cause the pore blockage of mesoporous materials (especially small pore size 2~4 nm), affecting the fragrance loading and release), so that the surface forms amino groups. Among them, during the APTES / ethanol solution immersion stage: the ethoxy group (-OCH2CH3) of APTES is hydrolyzed to silanol (-SiOH) in the ethanol solution by trace moisture: APTES ((3-aminopropyl)triethoxysilane) + 3H2O→Si(OH)3-CH2CH2CH2NH2+ 3C2H5OH. The silanol (-SiOH) generated by hydrolysis, when immersed in the mesoporous particle suspension (usually aqueous phase) subsequently: condenses with the silicon hydroxyl (Si-OH) on the surface of the mesoporous particles (such as SBA-15 / MCM-41) to form Si-O-Si covalent bonds; condenses with the amino (-NH2) or hydroxyl (-OH) of the adhesion layer such as PDA to form Si-O-C / N bonds. Thus forming a stable chemical linkage of "reservoir substrate-adhesion layer-coupling agent-mesoporous particles".

[0162] In some possible implementations, the average particle size of the first mesoporous particles is higher than that of the second mesoporous particles, and the step of loading the first mesoporous particles and the second mesoporous particles comprises: S33. Immersing the modified substrate in a suspension of the first mesoporous particles, and performing a mixing reaction to load the first mesoporous particles onto the surface of the modified substrate, and drying to obtain a substrate loaded with the first mesoporous particles; S34. Immersing the substrate loaded with the first mesoporous particles in a suspension of the second mesoporous particles, and performing a standing treatment to load the second mesoporous particles onto the surface of the modified substrate, and cleaning and drying to obtain a reservoir material.

[0163] In this case, through a step-by-step impregnation process, the final realization of the post-adjustment macromolecular first fragrance (first mesoporous particles with large pore size load) and the pre-adjustment small molecular second fragrance (small pore size + cyclodextrin complex) are released quickly and delayed, achieving the accurate exchange of the sequence of taste. The first mesoporous particles with large pore size are preferably loaded onto the surface of the modified substrate by forming Si-O-Si bonds with the coupling agent, and the second mesoporous particles with small pore size are further loaded onto the surface of the modified substrate by physical adsorption such as hydrogen bonding, van der Waals force, electrostatic adsorption, and forming Si-O-Si bonds with the remaining active sites of the coupling agent. The first mesoporous particles with large pore size are loaded first, and the second mesoporous particles with small pore size can fill the sites not covered by the first mesoporous particles with large pore size due to their smaller size, and the remaining active sites of the coupling agent can be combined with the second mesoporous particles with small pore size through Si-O-Si bonds. In addition, when the first mesoporous particles with large pore size are preferentially loaded, their pore structure can provide physical support sites for the second mesoporous particles with small pore size, forming a three-dimensional hierarchical pore structure, which can avoid competitive adsorption, increase the total loading capacity, and reduce the cross-diffusion of fragrance molecules in the blending system. At the same time, when the first mesoporous particles with large pore size are used as the bottom layer, their rough surface provides more anchoring sites for the second mesoporous particles with small pore size on the upper layer, forming a mechanical interlocking structure. This reverse loading strategy can successfully decouple the "time-space" dimension of fragrance release, while maintaining the instantaneous vaporization characteristics of the aerosol generating substrate, improving the perception intensity of the post-adjustment macromolecular first fragrance, prolonging the duration of the pre-adjustment small molecular second fragrance, and achieving the time sequence reconstruction of the taste level.

[0164] In some possible implementations, the concentration of the suspension of the first mesoporous particles is 10 mg / mL to 20 mg / mL. For example, the concentration of the suspension of the first mesoporous particles can be 10 mg / mL, 11 mg / mL, 12 mg / mL, 13 mg / mL, 14 mg / mL, 15 mg / mL, 16 mg / mL, 17 mg / mL, 18 mg / mL, 19 mg / mL, 20 mg / mL, or any interval value between any two point values. In this case, the concentration of the suspension of the first mesoporous particles avoids both the insufficient amount of mesoporous material leading to low loading capacity and the agglomeration of particles (especially in ethanol dispersion medium) reducing dispersion uniformity and causing local accumulation to block the pores of the liquid storage substrate, as well as increasing the difficulty of cleaning the unbound residual particles.

[0165] In some possible implementations, the concentration of the suspension of the second mesoporous particles is 5 mg / mL to 10 mg / mL. Exemplarily, the concentration of the suspension of the second mesoporous particles can be any of 5 mg / mL, 6 mg / mL, 7 mg / mL, 8 mg / mL, 9 mg / mL, 10 mg / mL, or an interval value between any two of the above values. In this case, the concentration of the suspension of the second mesoporous particles can avoid particle agglomeration, ensure that the material is fully dispersed in the solvent, and improve the binding efficiency with active groups such as amino groups on the surface of the liquid storage substrate. Avoiding the accumulation of mesoporous particles can cause some pores to be blocked, reducing the adsorption efficiency of the fragrance inclusion compound.

[0166] In some embodiments, by stepwise immersion, the first mesoporous particles with large pore diameters of the first fragrance of large molecules are preferentially adsorbed, and then the second mesoporous particles with small pore diameters of the second fragrance of small molecules are adsorbed, to achieve layered loading. Exemplarily, the steps include: immersing the liquid storage substrate into a suspension of pretreated first mesoporous particles with large pore diameters (such as SBA-15, dispersed in ethanol, with a concentration of 10 mg / mL to 20 mg / mL), stirring at 40°C for 60 minutes, combining the mesoporous material through amino-silanol covalent bonds, removing and ultrasonically cleaning with ethanol for 5 minutes (power 100 W), and drying at 60°C for 1 hour, to fix the first mesoporous particles with large pore diameters. Subsequently, immersing the liquid storage substrate loaded with the first mesoporous particles with large pore diameters into a suspension of second mesoporous particles with small pore diameters (dispersed in ethanol, with a concentration of 5 mg / mL to 10 mg / mL), and standing at room temperature for 40 minutes to avoid destroying the loaded structure at high temperature, and then sequentially ultrasonically cleaning with toluene (to remove the fragrance that is not inclusion) and ethanol (to remove free particles) for 10 minutes, and drying at 60°C for 2 hours.

[0167] In some possible implementations, in the liquid storage substrate, the mass ratio of the loaded first mesoporous particles to the second mesoporous particles is (3 to 5): 1. In this case, in the liquid storage substrate, the loading amount of the first mesoporous particles is higher than that of the second mesoporous particles, ensuring that the first fragrance of large molecules in the first mesoporous particles with a high loading amount is preferentially released, achieving precise replacement of the order of flavor taste in aerosol, enriching the taste of aerosol, and achieving diversification.

[0168] In a third aspect, the embodiments of the present application provide a heating module, including the above-mentioned liquid storage material and / or the liquid storage material prepared by the above-mentioned method.

[0169] The heating module in the embodiment of the present application comprises the liquid storage material described above, and the liquid storage material simultaneously carries the first mesoporous particles and the second mesoporous particles that are respectively loaded with the macromolecular first fragrance and the micromolecular second fragrance in a hierarchical manner. Thus, in the heating process of the heating module, the liquid storage material can preferentially release and vaporize the macromolecular first fragrance, and the release and vaporization of the micromolecular second fragrance are delayed, so as to realize accurate regulation of the order of the flavor taste in the aerosol and improve the taste level of the fragrance in the aerosol.

[0170] In a fourth aspect, the embodiment of the present application provides an aerosol generating device, comprising a power supply assembly and the heating module described above.

[0171] In the aerosol generating device of the present application, the heating module described above is included, so that the aerosol generating device can release the micromolecular second fragrance originally belonging to the front note later and preferentially release the macromolecular first fragrance originally belonging to the rear note, so as to realize accurate regulation of the order of the flavor taste in the aerosol and give the liquid storage material the characteristic of accurately regulating the release kinetics of the fragrance.

[0172] To enable the above-mentioned implementation details and operations of the present application to be clearly understood by those skilled in the art, and to further demonstrate the significant performance of the liquid storage material and its preparation method, the heating module, and the aerosol generating device of the embodiment of the present application, the following multiple embodiments are used to illustrate the above technical solutions.

[0173] Embodiment 1 A liquid storage material, as shown in the accompanying drawings, is prepared including the following steps: Figure 4 1. Pretreatment to remove impurities: The PET liquid storage substrate is immersed in anhydrous ethanol for 24 hours, then washed with distilled water and dried (70°C, 3 hours), so as to remove the residual organic pollutants on the surface and improve the efficiency of the subsequent modification reaction.

[0174] 2. Fragrance loading: (1) Loading the first mesoporous particles with the rear note macromolecular first fragrance: the SBA-15 first mesoporous substrate is mixed with the rear note macromolecular first fragrance (caramel aldehyde), and then treated by vacuum immersion method (vacuum degree 0.09 MPa, temperature 45°C) for 2.5 hours to adsorb the macromolecular first fragrance into the pores by Van der Waals force and capillary action. Then, the surface free fragrance is removed by washing with n-hexane, and the first mesoporous particles are obtained by vacuum drying at 60°C for 2 hours.

[0175] ​(2) Second mesoporous particles loaded with pre-adjusted small molecule second fragrance: Form an inclusion complex of pre-adjusted small molecule second fragrance (menthol) and β-cyclodextrin (β-CD) (the hydrophobic cavity of β-cyclodextrin includes menthol molecules through van der Waals force and hydrogen bond, reducing its volatility), and grind into powder after freeze-drying. Then, mix the inclusion complex with the MCM-41 second mesoporous substrate, disperse in ethanol, and vacuum impregnate (0.1 MPa, 50°C) for 1 hour to adsorb into the small pore mesoporous material, obtaining second mesoporous particles; the reaction formula is as follows: β-CD + menthol → β-CD · menthol (inclusion complex).

[0176] 3. Construction of polydopamine adhesion layer: After cleaning, immerse the PET reservoir substrate in a dopamine (DA) aqueous solution (pH = 8.5, concentration 2.5 g / L, 80°C stirring for 4 hours) to form a polydopamine (PDA) adhesion layer on the surface of the reservoir substrate, enhancing the hydrophilicity and subsequent loading capacity of the mesoporous material. Then, add ferric chloride (FeCl3) (0.55 g / L) to the dopamine solution (pH = 5) for 13 minutes to supplement cross-linking through ion diffusion, forming a phenol-iron cross-linking network to improve the stability of the adhesion layer; the reaction formula is as follows: Dopamine (DA) → polydopamine (PDA) + H2O; PDA (catechol group) + FeCl3 → PDA-Fe 3+ Complex + 3HCl.

[0177] 4. Grafting coupling agent: Immerse the reservoir substrate modified with the adhesion layer in a silane coupling agent APTES / ethanol solution (concentration 8% v / v, pH = 5) for 30 minutes to form amino groups on the surface, obtaining a coupling agent modified substrate. The reaction formula of the coupling agent APTES and the amino-quinone group of the PDA adhesion layer is as follows: PDA (containing quinone group) + APTES (amino group) → PDA-NH-CH2CH2CH2Si(OH)3.

[0178] 5. Loading of mesoporous particles, through stepwise impregnation, preferentially adsorbing first mesoporous particles, then adsorbing second mesoporous particles, to realize layered loading. The specific steps are as follows: Immerse the coupling agent modified substrate in a first mesoporous particle suspension (ethanol dispersion, concentration 15 mg / mL) and stir at 40°C for 60 minutes to covalently bond the mesoporous material through amino-silanol groups. After removal, wash with ethanol for 5 minutes (power 100 W), and dry at 60°C for 1 hour to fix the loading of the first mesoporous particles.

[0179] Subsequently, the first mesoporous particle loaded reservoir substrate was immersed in a suspension of the second mesoporous particle (ethanol dispersion, concentration 5-10 mg / mL), and was left at room temperature for 40 minutes to avoid high temperature damage to the loaded structure. Then, the substrate was sequentially cleaned with toluene (to remove the un-included fragrance) and ethanol (to remove the free particles) for 10 minutes each, and was dried at 60°C for 2 hours to obtain the reservoir material. In the condensation reaction of the coupling agent APTES and the mesoporous material (SiO2), the reaction formula is as follows: Si(OH)3-CH2CH2NH2+ SiO2-OH→ SiO2-O-Si-CH2CH2NH2+ H2O.

[0180] Example 2 A reservoir material, which is different from Example 1 in that in step (2) of step 2, the β-cyclodextrin is replaced by γ-cyclodextrin.

[0181] Example 3 A reservoir material, which is different from Example 1 in that in step (1) of step 2, the SBA-15 first mesoporous substrate is replaced by KIT-6.

[0182] Example 4 A reservoir material, which is different from Example 1 in that in step (1) of step 2, the SBA-15 first mesoporous substrate is replaced by CMK-3.

[0183] It should be noted that, in order to form a covalent bond (such as an amide bond) or an ionic bond with the amino group on the reservoir substrate, an additional reagent with an oxygen-containing functional group (such as -COOH, -OH) can be added for additional surface oxidation treatment during loading.

[0184] Example 5 A reservoir material, which is different from Example 1 in that in step (2) of step 2, the MCM-41 second mesoporous substrate is replaced by NH2-MCM-41.

[0185] It should be noted that, in order to prevent the decomposition of the amino group in the second mesoporous substrate, high temperature drying should be avoided, and the temperature should be lower than 80°C.

[0186] Example 6 A reservoir material, which is different from Example 1 in that in step (2) of step 2, the MCM-41 second mesoporous substrate is replaced by Al-MCM-41.

[0187] It should be noted that, in order to avoid pore blockage or significant decrease in specific surface area, the amount of aluminum doped in the MCM-41 can be adaptively controlled.

[0188] Comparative Example 1 The PET stock solution material after impurity removal by pretreatment is used as the stock solution material of Comparative Example 1, and the first flavor (caramel aldehyde) and the second flavor (menthol) are directly added to the aerosol generating substrate.

[0189] Comparative Example 2 A stock solution material, which is different from Example 1 in that the pre-tuned small molecule second flavor (menthol) in step (2) of step 2 is not formed into an inclusion compound with β-cyclodextrin (β-CD), i.e., the pre-tuned small molecule second flavor is directly loaded in MCM-41.

[0190] In order to verify the progressiveness of the embodiments of the present application, the above examples and comparative examples are subjected to the following performance tests: taking the caramel menthol taste in the examples and comparative examples as an example, caramel is post-tuned, and menthol is pre-tuned, and whether the menthol aroma covers the caramel aroma at the moment of suction is used to judge the release order and effect of the flavors; The test results are shown in Table 1 below:

[0191] From the above test results, it can be seen that the stock solution material provided by the embodiments of the present application can make the post-tuned large molecule flavor be released preferentially in the vaporization process of the stock solution material, while delaying the release of the pre-tuned small molecule flavor, enriching the taste of the aerosol, and overcoming the problem of single release order of the flavors in traditional aerosols. Moreover, the overall release rate of the flavors in the aerosol generating substrate is delayed, so that the aroma duration is higher. The precise control of the flavor taste order in the aerosol is achieved, and the stock solution material is endowed with the characteristics of precise control of flavor release kinetics. The stock solution material provided by the embodiments of the present application is suitable for users who have high requirements for aroma duration and special needs for flavor release order.

[0192] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid storage material, characterized in that It includes a liquid storage substrate with a porous structure and at least first mesoporous particles and second mesoporous particles loaded on the surface of the porous skeleton of the liquid storage substrate, the average pore size of the first mesoporous particles is larger than the average pore size of the second mesoporous particles, the pores of the first mesoporous particles are loaded with a first flavor, the pores of the second mesoporous particles are loaded with a second flavor, and the molecular weight of the first flavor is higher than the molecular weight of the second flavor.

2. The liquid storage material according to claim 1, wherein The second flavor is loaded in the pores of the second mesoporous particles in the form of an inclusion compound, wherein the inclusion compound comprises a carrier material having a molecular cavity and the second flavor located in the molecular cavity; And / or, the material of the liquid storage substrate includes at least one of polyethylene terephthalate, polyamide, polypropylene, and polyethylene; And / or, the average particle size of the first mesoporous particles is greater than the average particle size of the second mesoporous particles.

3. The liquid storage material according to claim 2, wherein The carrier material includes at least one of β-cyclodextrin, α-cyclodextrin, γ-cyclodextrin, calixarene, dendrimer, and metal organic framework; and / or, the molar ratio of the second flavor to the carrier material is 1:(1-1.2); and / or, the porosity of the liquid storage substrate is 90% to 96%; And / or, the density of the liquid storage substrate is 0.05 g / cm 3 ~0.1g / cm 3 .

4. The liquid storage material according to any one of claims 1 to 3, wherein The mesoporous substrates of the first mesoporous particles and the second mesoporous particles are independently selected from silicon-based mesoporous materials.

5. The liquid storage material according to claim 4, characterized in that The average particle size of the first mesoporous particles is 1 μm to 10 μm; And / or, the average pore size of the first mesoporous particles is 5 nm to 10 nm; and / or, the porosity of the first mesoporous particles is 40% to 60%; And / or, the mesoporous substrate of the first mesoporous particles is selected from at least one of SBA-15, KIT-6, FDU-12, CMK-3, CMK-5, CMK-8, MIL-101(Cr), MIL-100(Fe), and UiO-66.

6. The liquid storage material according to claim 5, characterized in that The average particle size of the second mesoporous particles is 0.5 μm to 5 μm; And / or, the average pore size of the second mesoporous particles is 2 nm to 4 nm; and / or, the porosity of the second mesoporous particles is 50% to 70%; And / or, the mesoporous substrate of the second mesoporous particles is selected from at least one of MCM-41, NH2-MCM-41, and Al-MCM-41.

7. The liquid storage material according to any one of claims 1 to 3 or 5 to 6, wherein: The molecular weight of the first flavor is 200Da~500Da; And / or, the first flavor includes at least one of ambergris derivatives, clary lactone, acetylated cedrene, cream, and caramel.

8. The liquid storage material according to claim 7, wherein The molecular weight of the second flavor is 70Da~250Da; And / or, the second flavor includes at least one of berry flavor, fruit flavor, floral flavor, vanilla flavor, and wine flavor.

9. The liquid storage material according to any one of claims 1 to 3, 5 to 6 or 8, wherein: The mass ratio of the first mesoporous particles to the first essence is 100%: (50%-80%); and / or, the mass ratio of the second mesoporous particles to the second essence is 100%: (15%-25%); And / or, in the liquid storage substrate, the mass ratio of the first mesoporous particles to the second mesoporous particles loaded is (3-5):

1.

10. The liquid storage material according to claim 9, characterized in that The porous skeleton surface of the liquid storage substrate is modified with an adhesion layer, a coupling agent is grafted on the surface of the adhesion layer away from the liquid storage substrate, and the first mesoporous particles and the second mesoporous particles are loaded onto the surface of the liquid storage substrate through the adhesion layer and the coupling agent.

11. The liquid storage material according to claim 10, wherein The adhesive layer comprises at least one adhesive polymer selected from the group consisting of polydopamine, tannic acid polymer, catechol polymer, gallic acid polymer, and catecholamine polymer; And / or, the coupling agent includes at least one of γ-aminopropyltriethoxysilane, N-aminoethyl-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, titanate coupling agent, and zirconate coupling agent.

12. The liquid storage material according to claim 11, wherein In the adhesive layer, the adhesive polymer is combined with a coordination ion; And / or, the thickness of the adhesion layer is 100 nm to 300 nm.

13. The liquid storage material according to claim 12, wherein The coordination ions include at least one metal ion selected from the group consisting of iron ions, copper ions, lithium ions, and silver ions; And / or, the coordination ions include at least one of borate ions and ionic metal-organic frameworks.

14. A method for preparing a liquid storage material, characterized in that: The following steps are involved: preparing first mesoporous particles loaded with a first fragrance; preparing second mesoporous particles loaded with a second flavor; wherein the average pore size of the first mesoporous particles is larger than the average pore size of the second mesoporous particles, and the molecular weight of the first flavor is higher than the molecular weight of the second flavor; A liquid storage substrate with a porous structure is obtained, and the first mesoporous particles and the second mesoporous particles are loaded at least onto the porous skeleton surface of the liquid storage substrate to obtain a liquid storage material.

15. The method for preparing the liquid storage material according to claim 14, wherein: The steps of preparing the first mesoporous particles include: dispersing the first mesoporous substrate and the first fragrance in a solvent, filling the first fragrance into the pores of the first mesoporous substrate by vacuum impregnation, washing and drying to obtain the first mesoporous particles; The steps of preparing the second mesoporous particles include: preparing the second flavor and a carrier material with a molecular cavity into an inclusion compound powder, dispersing the inclusion compound powder and a second mesoporous substrate in a solvent, and filling the inclusion compound powder into the pores of the second mesoporous substrate by vacuum impregnation to obtain the second mesoporous particles.

16. The method for preparing the liquid storage material according to claim 15, wherein: The carrier material includes at least one of β-cyclodextrin, α-cyclodextrin, γ-cyclodextrin, calixarene, dendrimer, and metal organic framework; And / or, the first mesoporous substrate is selected from at least one of SBA-15, KIT-6, FDU-12, CMK-3, CMK-5, CMK-8, MIL-101(Cr), MIL-100(Fe), and UiO-66; And / or, the second mesoporous substrate is selected from at least one of MCM-41, NH2-MCM-41, and Al-MCM-41; And / or, the first flavor includes at least one of ambergris derivatives, sclareolide, acetylated cedrene, cream, and caramel; And / or, the second flavor includes at least one of berry flavor, fruit flavor, floral flavor, vanilla flavor, and wine flavor.

17. The method for preparing a liquid storage material according to any one of claims 14 to 16, wherein: Before loading the first mesoporous particles and the second mesoporous particles onto at least the porous skeleton surface of the liquid storage substrate, the liquid storage substrate is first modified as follows: Modifying an adhesion layer on the surface of the porous skeleton of the liquid storage substrate; A coupling agent is grafted onto the surface of the adhesive layer to obtain a modified substrate.

18. The method for preparing the liquid storage material according to claim 17, wherein: The preparation step of the adhesion layer comprises: immersing the liquid storage substrate in a solution of adhesion monomers, wherein the adhesion monomers undergo polymerization reaction on the porous skeleton surface of the liquid storage substrate to form adhesion polymers, thereby obtaining the adhesion layer; And / or, the step of grafting a coupling agent onto the surface of the adhesive layer includes: immersing the substrate modified with the adhesive layer in a solution of the coupling agent, and grafting the coupling agent onto the surface of the adhesive layer through hydrolysis and polycondensation reaction to obtain the modified substrate.

19. The method for preparing the liquid storage material according to claim 18, wherein: The adhesive monomer includes at least one of dopamine, tannic acid, catechol, gallic acid, and catecholamine; And / or, a coordination material is further added to the solution of the adhesion monomer, and the coordination material coordinates with the adhesion polymer to form a complex; And / or, the coupling agent includes at least one of γ-aminopropyltriethoxysilane, N-aminoethyl-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, titanate coupling agent, and zirconate coupling agent.

20. The method for preparing the liquid storage material according to claim 19, wherein: In the solution of the adhesion monomer, the concentration of the adhesion monomer is 2.0 g / L to 3.0 g / L; and / or, in the solution of the adhesion monomer, the concentration of the coordination material is 0.5 g / L to 0.6 g / L; And / or, in the coupling agent solution, the volume percentage of the coupling agent is 5% to 10%.

21. The method for preparing a liquid storage material according to any one of claims 18 to 20, wherein: The average particle size of the first mesoporous particles is greater than the average particle size of the second mesoporous particles, and the step of loading the first mesoporous particles and the second mesoporous particles comprises: Immersing the modified substrate in a suspension of the first mesoporous particles, performing a mixing reaction to load the first mesoporous particles onto the surface of the modified substrate, and drying to obtain a substrate loaded with the first mesoporous particles; The substrate loaded with the first mesoporous particles is immersed in a suspension of the second mesoporous particles, and allowed to stand to allow the second mesoporous particles to be loaded onto the surface of the modified substrate. The substrate is then washed and dried to obtain the liquid storage material.

22. The method for preparing the liquid storage material according to claim 21, wherein: The concentration of the suspension of the first mesoporous particles is 10 mg / mL to 20 mg / mL; And / or, the concentration of the suspension of the second mesoporous particles is 5 mg / mL to 10 mg / mL.

23. A heating module, characterized in that: The method comprises the liquid storage material according to any one of claims 1 to 13 and / or the liquid storage material prepared by the method according to any one of claims 14 to 22.

24. An aerosol generating device, characterized in that: It comprises a power supply assembly and the heating module as claimed in claim 23.

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