Aerosol-generating substrate and method of making the same

Abstract

The application discloses an aerosol generating substrate and a preparation method thereof. The preparation method comprises the following steps: preparing a substrate precursor: taking pretreated tobacco and / or aromatic plants, inorganic porous materials, polyhydric alcohol smoke agents, flavor additives and binders, and adding water and / or ethanol, and then performing slurry preparation, granulation and preliminary drying to form base particles; compression molding: forming the aerosol generating substrate with airway holes; drying and puffing treatment: performing secondary drying and puffing treatment, so that the wall material of the aerosol generating substrate is a porous skeleton structure composed of continuous micropores. The preparation method of the application does not need multiple high-temperature treatments, and avoids the destruction of flavors caused by high temperature. The wall material forms a porous skeleton structure composed of continuous micropores, which guarantees the structural strength and increases the contact area between external air and smoke, so that the smoke is mixed more uniformly and is thick when being smoked.

Description

Technical Field

[0001] This invention relates to the field of heated non-combustible tobacco technology, and in particular to an aerosol generation matrix and its preparation method. Background Technology

[0002] Heated cigarettes produce smoke by heating the smoke-generating section (aerosol-generating matrix) of the cigarette. The smoke produced has a relatively good taste. Currently, commercially available heated cigarettes often have insufficient smoke output. This is mainly because the tobacco leaf sheets or other aromatic plant sheets used as the aerosol-generating matrix require multiple high-temperature treatments during the production process. These high temperatures destroy the flavor substances, fragrance additives, and smoke-generating agents in the tobacco leaves or other aromatic plants, affecting the taste. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an aerosol generation matrix and its preparation method, in view of the deficiencies of the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is: a method for preparing an aerosol generation matrix, comprising the following steps: S1. Preparation of matrix precursor: Take tobacco and / or aromatic plants that have undergone aroma pretreatment, inorganic porous materials, polyol smoke-generating agents, flavor additives and binders, and add pretreated thermally conductive materials or electromagnetic induction materials, and add solvents, namely water and / or ethanol, to prepare slurry, granulate and pre-dry to form basic particles, thus obtaining the matrix precursor. S2, Compression molding: Add the matrix precursor into the mold, compress and demold to form a matrix intermediate with at least one air pore; S3. Drying and puffing treatment: The matrix intermediate formed in step S2 is subjected to a second drying and puffing treatment to form an aerosol generation matrix. The wall material of the aerosol generation matrix is ​​a porous skeleton structure composed of continuous micropores.

[0005] Further, preferably in step S1, the aromatic plant is at least one of the following: Liliaceae, Cupressaceae, Valerianaceae, Primulaceae, Fabaceae, Ericaceae, Annonaceae, Burseraceae, Mimosaceae, Iridaceae, Scrophulariaceae, Gentianaceae, Verbenaceae, Aristolochiaceae, Magnoliaceae, Oleaceae, Rosaceae, Solanaceae, Rubiaceae, Lauraceae, Rutaceae, Asteraceae, Orchidaceae, Poaceae, Piperaceae, Juglandaceae, Caprifoliaceae, Zingiberaceae, Apiaceae, Moraceae, Amaryllidaceae, Pinaceae, Usnea, Myrtaceae, Hamamelidaceae, and Malvaceae.

[0006] Furthermore, preferably in step S1, 0-5 parts by weight of a thermally conductive material are added. The thermally conductive material is at least one selected from iron powder, copper powder, graphite powder, graphene, boron nitride, aluminum oxide, and carbon powder. The thermal conductivity of the thermally conductive material is 1-500 W / mk, the particle size of the thermally conductive material is 20 nm-2 μm, and the porosity of the thermally conductive material is >65%.

[0007] Furthermore, it is preferable that the thermally conductive material undergoes a high-temperature purification treatment, wherein the temperature of the high-temperature purification treatment is 800-1500℃.

[0008] Furthermore, preferably in step S1, an electromagnetic induction material in a mass fraction of 0-8 parts is added, wherein the electromagnetic induction material is at least one of iron, nickel, copper, germanium, carbon, chromium, tin, manganese, and aluminum.

[0009] Furthermore, the electromagnetic induction material is preferably subjected to a crushing process, and the crushed electromagnetic induction material is formed into filamentous fibers with a length of 10-50μm.

[0010] Furthermore, preferably in step S1, 0-8 parts by weight of a resistance heating material are added, wherein the resistance heating material includes at least one of zirconium oxide, carbon nanotubes, nickel, chromium and iron.

[0011] Further, preferably in step S1, the inorganic porous material includes at least one of zeolite, molecular sieve, diatomaceous earth, montmorillonite, alumina, silica gel, activated carbon, calcium silicate, chitosan porous material, cellulose fiber, lignin particles, clay, sepiolite, and palygorskite; and / or, the polyol smoking agent includes at least one of glycerol, propylene glycol, butylene glycol, and glycerol; and / or, the flavor additive is an extract of tobacco and / or an extract of aromatic plants; and / or, the binder includes one or more combinations of pullulan, tamarind polysaccharide, and hydroxypropyl methylcellulose.

[0012] Further, preferably in step S1, the matrix precursor preparation comprises the following raw materials in parts by weight: 30-80 parts tobacco and / or aromatic plants, 10-30 parts polyol smoking agent, 0-5 parts binder, 5-20 parts inorganic porous material and 5-10 parts flavor additive.

[0013] Further, preferably in step S1, the pretreatment of tobacco and / or aromatic plants includes crushing the tobacco and / or aromatic plants by impact; then placing the above materials in a vacuum sealed environment, adding an acidic treatment solution, and heating them at a temperature of 60-120°C, so that the volume of the tobacco and / or aromatic plants expands by 1.1-1.5 times.

[0014] Further, preferably, in step S1, the viscosity of the formed base particles is 500-1500 Pa·s, and the mass percentage of the liquid phase component in the matrix precursor is 10-50%.

[0015] Furthermore, preferably in step S3, low-temperature vacuum drying and puffing are used, so that the solvent in the system overflows in order of boiling point under low-temperature vacuum to form pores, so that the wall material of the aerosol generation matrix forms a porous skeleton structure composed of continuous micropores.

[0016] Furthermore, the preferred process parameters for low-temperature vacuum drying and puffing are: pressure 15 kPa~85 kPa, temperature 30-80℃, and the mass percentage of the liquid phase component of the aerosol matrix is ​​less than or equal to 5%.

[0017] Furthermore, preferably in step S3, hot air drying and puffing are used. Under hot air drying conditions, the solvent in the system overflows in order of boiling point to form pores, so that the wall material of the aerosol generation matrix forms a porous framework structure composed of continuous micropores, and finally the aerosol generation matrix is ​​obtained.

[0018] Furthermore, the preferred process parameters for hot air drying and puffing are 50-120℃, and the mass percentage of the liquid phase component in the aerosol matrix formed is less than or equal to 5%.

[0019] Furthermore, preferably when the solvent added in step S1 is water, in step S3, a freeze-drying process is used to transform the aqueous ice crystals into free water molecules that overflow and form pores, so that the wall material of the aerosol generation matrix forms a porous framework structure composed of continuous micropores.

[0020] Furthermore, the preferred process parameters for the freeze-drying process are -10℃ to -87℃, and the mass percentage of the liquid phase component in the aerosol matrix formed is less than or equal to 5%.

[0021] Further, in step S2, by feeding the matrix precursor into the mold, the polymer volume ratio is compressed to 6:1-10:3 under pressure, and a one-piece matrix intermediate is formed by demolding. The lower mold space of the mold contains at least one vertical rod, and after the upper mold is stamped, axial air passage holes adapted to the shape of the rod are stamped out.

[0022] Furthermore, preferably in step S3, the micropores of the aerosol generating matrix formed are 50nm-20μm, and the porosity is 20%-80%.

[0023] Furthermore, the micropores of the formed aerosol generating matrix are preferably 10nm-50nm.

[0024] The present invention also provides an aerosol generation matrix having at least one axial airway pore, wherein the wall material of the aerosol generation matrix is ​​a porous framework structure composed of continuous micropores, wherein the pore size of the micropores is 50nm-20μm and the porosity is 20%-80%.

[0025] Furthermore, the preferred aerosol generating matrix comprises the following raw materials in parts by weight: 30-80 parts tobacco and / or aromatic plants, 10-30 parts polyol smoke-generating agent, 0-5 parts binder, 5-20 parts inorganic porous material, and 5-10 parts flavor additive.

[0026] The present invention has the following beneficial effects: The aerosol generating matrix of the present invention is produced by adding water and / or ethanol and other pore-forming agents to the matrix precursor, pre-drying and pressing it into shape, and then performing a secondary drying and expansion treatment, which causes the water and / or ethanol in the wall material to overflow. At this time, continuous micropores are formed in the original positions of the water and / or ethanol. The micropores are randomly arranged and interconnected, so that the wall material forms a porous skeleton structure composed of continuous micropores, which ensures that the wall material has a certain structural strength and increases the contact area between the outside air and the flue gas, resulting in more uniform mixing. In addition, the preparation method of the present invention does not require multiple high-temperature treatment processes. The reaction conditions are relatively mild and easy to control, avoiding the destruction of aroma substances, flavoring additives and smoke-generating agents in tobacco leaves or other aromatic plants by high temperatures, resulting in a purer taste and improving the user's taste experience. Attached Figure Description

[0027] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings.

[0028] Figure 1 This is a schematic flowchart of the preparation method of the aerosol generation matrix according to an embodiment of the present invention; Figure 2 This is a scanning electron microscope image of the aerosol generation matrix of Embodiment 1 of the present invention. Detailed Implementation

[0029] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be more thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0030] A method for preparing an aerosol generation matrix, such as Figure 1 As shown, it includes the following steps: S1. Preparation of matrix precursor: Take pretreated tobacco and / or aromatic plants, inorganic porous materials, polyol smoking agents, flavor additives, and binders, and add a solvent, namely water and / or ethanol, to prepare a slurry, granulate, and preliminarily dry to form basic particles. The viscosity of the basic particles is 500-1500 Pa·s, and the mass percentage of the liquid phase component in the matrix precursor is 10-50%, thus obtaining the matrix precursor. Here, "mass percentage of the liquid phase component" refers to the mass percentage of the liquid phase in the solid matrix precursor.

[0031] For example, the viscosity of the base particles can be controlled at 500 Pa·s, 600 Pa·s, 700 Pa·s, 800 Pa·s, 900 Pa·s, 1000 Pa·s, 1100 Pa·s, 1200 Pa·s, 1300 Pa·s, 1400 Pa·s, and 1500 Pa·s, etc., without specific limitations, to facilitate subsequent processing; the mass percentage of the liquid phase component in the dried matrix precursor can be controlled at 10%, 12%, 14%, 15%, 16%, 17%, 18%, 20%, 25%, 30%, 35%, 40%, 45%, and 50%, etc., without specific limitations, to facilitate subsequent molding processing.

[0032] In this application, tobacco and / or aromatic plants are used as smoke-generating materials, preferably in powder form, for mixing and filling with other components; aromatic plants are plants with a certain aroma, medicinal value, or physiological satisfaction, including but not limited to Liliaceae (such as aloe, garlic, lily of the valley, hyacinth, onion, smilax, etc.), Cupressaceae (such as arborvitae, juniper, juniper, etc.), Valerianaceae (such as nard, valerian, horse chestnut, etc.), Primulaceae (such as fragrant grass, licorice, etc.), Fabaceae (such as Amorpha fruticosa, nanmu, acacia, clover, fenugreek, licorice, silver acacia, peanut, and sage). The following species are listed: *Symplocos edulis*, *Tamarindus cuspidata*, *Symplocos rubrum*, *Symplocos rubrum*, *Symplocos rubrum*, *Symplocos yunnanensis*, *Rhododendron capillus-veneris*, *Rhododendron davidii*, *Ilex cornuta*, *Symplocos yunnanensis*, *Cannabis sativa*, *Olive*, *Myrrh*, *Boswellia carterii*, *Mimosa pudica*, *Catechu*, *Iridaceae*, *Iris tectorum*, *Scrophulariaceae*, *Scrophularia ningpoensis*, *Gentianaceae*, *Swertia spp.*, *Gentiana*, *Swertia spp.*, *Gentiana*, *Swertia spp.*, *Verbenaceae*, *Vitex negundo*, *Vitex trifolia*, *Cephalotaxus fortunei*, *Cephalotaxus fortunei*, *Verbena officinalis*, *Aristolochiaceae*, *Aristolochia debilis*, *Aristolochia spp.*, *Aristolochia debilis*, *Aristolochia debilis*. (e.g., bellflower, mountain grass fruit, etc.) Magnoliaceae (e.g., star anise, white magnolia, yellow magnolia, purple magnolia, wild star anise, etc.), Oleaceae (e.g., lilac, jasmine, osmanthus, lilac, large-flowered jasmine, etc.), Rosaceae (e.g., rose, apricot, apple, cherry, dark red, hawthorn, plum, raspberry, strawberry, costus root, etc.), Solanaceae (e.g., pepper, tobacco, night-blooming jasmine, etc.), Rubiaceae (e.g., small-fruited coffee, gardenia, etc.), Lauraceae (e.g., Yunnan camphor, yellow camphor, laurel, mountain pepper, lindera, mountain licorice, bitter orange, poplar litsea, Sri Lankan cinnamon, monkey camphor, Sichuan cinnamon, new camphor, pomelo camphor, rock cinnamon, sassafras, cinnamon bark, firewood cinnamon) The following families are included in the Chinese genus: * **Rhus chinensis (cinnamomum),** * **Rutaceae (e.g., lemon, sweet orange, trifoliate orange, styrax, styrax rubra, Chinese cinnamon, lemongrass, white lemon, dandelion, pomelo, bergamot, red mandarin orange, Murraya paniculata, rue, Sichuan pepper, Michelia champaca, white lemon, bitter orange, sweet orange, citron, kumquat, lemon, and bamboo leaf pepper), * **Asteraceae (e.g., Artemisia capillaris, Artemisia argyi, Artemisia argyi, Atractylodes lancea, chicory, chrysanthemum, Saussurea costus, dandelion, Saussurea costus, Erigeron canadensis, immortelle, calendula, marigold, cosmos, tansy, yarrow, sage, sage, and sage), * **Orchidaceae (e.g., Cymbidium goeringii, vanilla folia), and * **Poaceae (e.g., Imperata cylindrica, vetiver, lemongrass, and citrus).** Lemongrass, Rue, Lemongrass, Corn, Java Lemongrass, Barley, Sugarcane, etc.), Piperaceae (Piper kadsura, Pepper, Small-leaved Climbing Ligustrum, Tribulus terrestris, etc.), Juglandaceae (such as Hickory, Walnut, etc.), Caprifoliaceae (such as Elderberry, Honeysuckle, etc.), Betulaceae (such as Sweet Birch, White Birch, etc.), Zingiberaceae (such as Amomum villosum, Sand Ginger, Cardamom, Alpinia galanga, Ginger, Large Alpinia galanga, Turmeric, Curcuma zedoaria, Amomum tsao-ko, Kaempferia galanga, etc.), Apiaceae (such as Fennel, Dill, Coriander, Artemisia scoparia, Carrot, Celery, Angelica sinensis, Fennel, Bean Sprouts, Small-leaved Pepper, Red Bupleurum, Northern Bupleurum, Dry Celery, Indian Dill, etc.), Moraceae (Fig).At least one of the following plants is acceptable: hops, Amaryllidaceae (daffodils, tuberose), Pinaceae (red pine, Masson pine, hemlock, fir, Tibetan longleaf pine), Usnea (clump-forming flowering tree, oakmoss), Myrtaceae (sandalwood, red sandalwood), Hamamelidaceae (lemon eucalyptus, clove, blue eucalyptus, large-leaved eucalyptus, guava, myrtle, fragrant tree, pearl orchid, silver pennywort, caviar orchid, sweetgum, styrax, etc.), and Malvaceae (almond rose, yellow okra, roselle, etc.). No specific limitation is made here. Flowers, fruits, roots, stems, leaves, bark, and seeds of other fragrant natural plants can also be considered aromatic plants.

[0033] In step S1, preferably, the tobacco and / or aromatic plants undergo aroma-generating treatment, which includes the following steps: taking tobacco and / or aromatic plants and subjecting them to impact crushing, the crushing treatment resulting in spindle-shaped and / or multi-rhomboid particles with an aspect ratio of (3~5):1, such as 3:1, 4:1, 5:1, etc., without specific limitation, crushing them into particles of this structure and aspect ratio; when tobacco, aromatic plants, or a mixture thereof adopts spindle-shaped or multi-rhomboid particles, it is easier to fill in the aerosol generating matrix, and other components can fill the gaps in tobacco, aromatic plants, or a mixture thereof, improving the space utilization rate in the matrix precursor. Because the matrix precursor is relatively dense, all components will be tightly filled in it during the production process, so that all components are fixed in the matrix precursor and will not be displaced, which is beneficial to maintaining the structural stability of the matrix precursor. This facilitates the subsequent preparation of the aerosol generating matrix, making the overall structure more robust and the smoke output better.

[0034] Crushed tobacco and / or aromatic plants are placed in a vacuum-sealed environment, treated with an acidic solution, and then heated to produce aroma at a temperature of 60-120℃ to obtain aromatic materials. When adding the acidic treatment solution, ensure that the solution fully impregnates the tobacco and / or aromatic plants. The purpose of impregnation is to allow the acidic solution to bind with nicotine and other alkaline flavor substances inside the cells. Heating converts the bound state into a free state, which then adheres to the surface of the tobacco and is rapidly released during heated inhalation. This results in a final pH of 6.5-7.8 for the treatment system, such as 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, etc., without specific limitations. This increases the amount of free nicotine (monomer nicotine) dissolved from the tobacco by at least 50%. Heating converts the bound nicotine state into a free state. For example, most nicotine in tobacco is citrate nicotine salt, which can be decomposed into free nicotine and citric acid through heating, reducing irritation and improving the taste experience. The preferred acidic treatment solution includes at least one of citric acid, benzoic acid, lactic acid, levulinic acid, salicylic acid, and tartaric acid. Adding this acidic solution makes the reaction with free salts and alkalis gentler, without damaging other components in tobacco, aromatic plants, or mixtures thereof. The heating temperature can be controlled at 60℃, 70℃, 75℃, 80℃, 90℃, 95℃, 100℃, 105℃, 110℃, 115℃, and 120℃, with no specific limitation. This gentle heating temperature prevents excessive heat from evaporating aroma compounds and avoids their destruction. The combination of crushing treatment and gentle vacuum heating hollows out the cells in the tobacco and / or aromatic plants, breaking down cell walls and transferring aroma compounds from within the cells to the surface. When heated without combustion, the aroma is more easily released, resulting in a richer and more mellow flavor, enhancing the user's taste experience. Taking tobacco as an example, aroma tests were conducted on tobacco before and after aroma treatment to detect the content of breadcrumbs and furfuryl alcohol in the reacting tobacco. The content of the two aroma components in the unreacted tobacco was zero. After aroma treatment, the content of breadcrumbs and furfuryl alcohol reached at least 0.15% and 0.25%, respectively. In other words, aroma treatment of tobacco and / or aromatic plants can make the aroma more easily released, the aroma more mellow, and improve the user's taste experience.

[0035] Among them, inorganic porous materials include at least one of zeolite, alumina, silica gel, activated carbon, calcium silicate, chitosan porous materials, cellulose fibers, lignin particles, clay, sepiolite, and molecular sieves. As porous fragrance carriers, their porous properties facilitate aerosol release. Inorganic porous materials can adsorb large amounts of fragrance substances using their own pore structure. Furthermore, the adsorption and release performance of porous materials is affected by temperature. At lower temperatures, the release performance of porous materials is low. Therefore, during the processing or transportation stages after fragrance enhancement, low-boiling-point fragrance substances can be better stored in porous materials, thus preserving the fragrance and extending the product's shelf life. As the temperature rises during the heated inhalation process, the fragrance substances in the porous structure are slowly released, thus achieving a slow-release fragrance enhancement effect, ensuring consistent smoke volume and aroma quality in the initial and final stages of inhalation.

[0036] The polyol smoke-generating agent includes at least one of glycerol, propylene glycol, butylene glycol, and glycerol; the flavoring additive is an extract of tobacco and / or an extract of aromatic plants, or other flavorings and fragrances. Adding flavoring additives enriches the aroma of the aerosol and enhances the user experience. The binder includes one or more combinations of pullulan, tamarind polysaccharide, and hydroxypropyl methylcellulose. Adding a binder increases the viscosity of the substances in the system, which is beneficial for subsequent compression molding. The presence of the binder and inorganic porous materials effectively ensures the amount of tobacco and / or aromatic plants added, resulting in sufficient aerosol-generated matrix smoke. Furthermore, under aqueous phase conditions, the polyol smoke-generating agent combines with the exposed hydroxyl groups in the binder through hydroxyl groups, and simultaneously, the water molecules in the dispersion system also transform into a bound state. The overall mixture changes from a liquid to a solid state. The solid mixture is then mixed with other powder materials to form a slurry, facilitating granulation, compression molding, and the formation of a porous framework structure for subsequent wall materials.

[0037] In a specific embodiment, in step S1, 0-5 parts by weight of heat-conducting material that has undergone high-temperature impurity removal treatment are added. For example, the mass of heat-conducting material is controlled to be 0 parts, 0.1 parts, 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts and 5 parts, and there is no specific limitation. The addition of heat-conducting material improves heating uniformity and heat conduction efficiency, and improves heating uniformity and smoke utilization of tobacco, aromatic plants or mixtures of the two. The thermally conductive material includes at least one of graphite powder, graphene, boron nitride, aluminum oxide, and carbon powder. The thermal conductivity of the thermally conductive material is 1-500 W / mk. The thermal conductivity system of the thermally conductive material is controlled to be 1 W / mk, 50 W / mk, 100 W / mk, 150 W / mk, 180 W / mk, 200 W / mk, 250 W / mk, 280 W / mk, 300 W / mk, 400 W / mk, 500 W / mk, etc. The above thermally conductive materials have high thermal conductivity, which allows the user to heat up quickly when inhaling and quickly transfer heat to tobacco, aromatic plants, or a mixture of the two, so that it produces smoke and generates aerosol. In this application, the selected thermally conductive resistive heating material has a particle size of 20 nm to 2 μm. For example, the selected thermally conductive resistive heating material has a particle size of 20 nm, 30 nm, 50 nm, 80 nm, 90 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 900 nm, 1 μm, 1.5 μm, 2 μm, etc., and there is no specific limitation. Controlling the particle size of the thermally conductive resistive heating material to the above-disclosed range can help to achieve uniform heat conduction of the thermally conductive material.

[0038] The thermally conductive material has a porosity >65%. Under high porosity conditions, the pores of the thermally conductive material can adsorb more polyol smoke-generating agents and tobacco / aromatic plant products, improving heat conversion and thus increasing the heat release efficiency of the adsorbent material. The obtained thermally conductive material can undergo high-temperature impurity removal and expansion treatment. The heating temperature for high-temperature impurity removal and expansion treatment is 800-1500℃. For example, the high-temperature impurity removal and expansion can be controlled to be stable at 800℃, 850℃, 900℃, 950℃, 1000℃, 1050℃, 1100℃, 1150℃, 1200℃, 1300℃, 1400℃, 1450℃, and 1500℃, etc., without being limited to any specific temperature. This is to remove impurities from the thermally conductive material, increase its porosity, which is beneficial to improving the thermal conductivity of the thermally conductive material and facilitating subsequent filling and mixing with other components.

[0039] In one specific embodiment, in step S1, 0-8 parts by weight of electromagnetic induction material are added. The mass percentage of the electromagnetic induction material is controlled to be 0 parts, 0.1 parts, 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, and 8 parts, etc., and is not specifically limited. The aerosol generating device has a magnetic field generating unit. The electromagnetic induction material is one or more combinations of iron, nickel, copper, and germanium. The particle size of the electromagnetic induction material is 50 nm-1 μm, and the particle size is 50 nm, 80 nm, 90 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 900 nm, etc. nm, 1μm, etc., are not specifically limited. Controlling the particle size of the electromagnetic induction material to the above-disclosed range can facilitate heating by the magnetic field generating unit, causing the smoke-generating material to generate aerosol. Step S1 also includes crushing the electromagnetic induction material. The crushing process forms filamentous fibers with a length of 10-50μm, such as filamentous fibers with lengths of 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc. Controlling the length and shape of the processed material to the above range is beneficial for the electromagnetic induction material fibers to overlap and form a mesh-like induction heating structure, increasing the induction heating area and improving the uniformity of heat distribution.

[0040] In one specific embodiment, in step S1, 0-8 parts by weight of resistance heating material are added. The mass percentage of resistance heating material is controlled to be 0, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, and 8 parts, etc., and is not specifically limited. The resistance heating material includes at least one of zirconium oxide, carbon nanotubes, nickel, chromium, and iron. The resistance heating material is used in the matrix precursor of resistance heating. The above resistance heating materials have good resistance heating efficiency, can heat up quickly, and quickly conduct heat to tobacco, aromatic plants, or a mixture of the two, so that they can quickly produce aerosols by smoking.

[0041] S2. Compression Molding: The matrix precursor is added to the mold. A vertical rod is placed in the lower mold space. The upper mold presses and demolds the matrix. Under pressure, the compression volume ratio is 6:1-10:3, such as 6:1, 4:1, 10:3, etc., which is not specifically limited. This forms a matrix intermediate with at least one axial air passage hole. The lower mold space contains at least one vertical rod. After the upper mold is stamped, an axial air passage hole matching the shape of the rod is stamped out. That is, the matrix intermediate can have a single air passage hole or multiple air passage holes, which is not specifically limited here. The outer surface of the aerosol generating matrix is ​​cylindrical or flat-nozzle (elliptical). The air passage hole structure can be columnar, flared with the opening facing upward, or other structures, which is not limited here. The hollow form of the aerosol generating matrix has a low retention rate of flue gas and facilitates the release of flue gas. Therefore, compared with the particulate aerosol generating matrix, the aerosol generating matrix of this application has a better flue gas release effect.

[0042] In step S2, the shape of the airway opening can be a circular or square opening with equal perimeters at both ends; or, the end face can be evenly divided into multiple equally divided square bodies, or a flared structure with a perimeter that is proportionally reduced or enlarged, or a stepped reduction structure.

[0043] S3. Drying and puffing treatment: The matrix intermediate formed in step S2 is subjected to a secondary drying and puffing treatment to form an aerosol generating matrix. The wall material of the aerosol generating matrix is ​​a porous framework structure composed of continuous micropores, wherein the pore size of the micropores is 10nm-20μm and the porosity is 20%-80%; more preferably, the pore size of the micropores is 10nm-50nm; this application controls the pore size of the micropores to be 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, etc. Micropores, ranging from nm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, and 20μm, with porosities of 20%, 30%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%, are used for aerosol smoke emission, and their porosity is positively correlated with the aerosol particle size. The disordered and interconnected micropores create a porous framework structure composed of continuous micropores in the wall material, ensuring that the wall material possesses... It has a certain structural strength and increases the contact area between the outside air and the flue gas, resulting in more uniform mixing. Moreover, these micropores are not the gaps between the stacked particles in the existing technology. These gaps are generally large, typically between 20-1000μm. The gaps between the stacked particles will shrink in volume as the effective components in the smoke particles are released by heat, resulting in a shrinkage of the overall volume of the smoke matrix and uneven heat distribution. This leads to inconsistent release of the effective components in the smoke matrix. At the same time, the aerosol release channels are blocked during the volume change, affecting the overall smoke emission efficiency of the aerosol. The micropores in this application are artificially created micropores with a relatively regular distribution, exhibiting a regular polyhedral structure, honeycomb structure, or other structures. The pore size is controllable from 10nm to 20μm, and the interconnected microscopic state of the overall formed structure serves as the smoke outlet channel for aerosols. The pore size is positively correlated with the particle size of aerosol ions. In this application, when the aerosol generating matrix is ​​placed in the aerosol generating device, aerosols are generated from between the micropores during the heating process. Under the user's suction, the aerosol diffuses to the central airway and is drawn out through the suction end. The smoke is rich during inhalation, and there is no significant difference between each puff. Furthermore, the preparation method of this application does not require multiple high-temperature treatment processes. The reaction conditions are relatively mild and easy to control, avoiding the destruction of aroma substances, flavoring additives, and smoke-generating agents in tobacco leaves or other aromatic plants by high temperatures, resulting in a purer taste and improving the user's taste experience.

[0044] In one specific embodiment, in step S1, the solvent is water and / or ethanol. The polyol fumigating agent combines with the exposed hydroxyl groups of the binder in the solvent system (including a solvent system with water as the dispersant, a solvent system with ethanol as the dispersant, and a solvent system formed by a mixture of water and ethanol) through hydroxyl groups. At the same time, the water molecules in the dispersion system also change to a bound state, and the overall mixture changes from a liquid state to a solid state. The solid mixture is then mixed with other components to form a slurry, which is then granulated. In step S2, tableting is performed. In step S3, low-temperature vacuum drying and puffing are used. Under low-temperature vacuum, the solvent in the system overflows in order of boiling point to form pores, so that the wall material of the aerosol generation matrix forms a porous framework structure composed of continuous micropores, and finally the aerosol generation matrix is ​​obtained.

[0045] Further, the preferred process parameters for low-temperature vacuum drying and puffing are: pressure of 15 kPa to 85 kPa, temperature of 30-80°C, and the mass percentage of the liquid phase component in the aerosol matrix is ​​less than or equal to 5%, such as 5%, 4.5%, 4%, 3.5%, 3%, 2.5%, 2%, 1.5%, 1%, and 0.9% of the liquid phase component; the low-temperature vacuum drying pressure parameters are controlled at 15 kPa, 20 kPa, 25 kPa, 30 kPa, 35 kPa, 40 kPa, 50 kPa, 55 kPa, 60 kPa, 65 kPa, 70 kPa, 75 kPa, 80 kPa, and 85 kPa. kPa, etc., are not specifically limited; the drying temperature is controlled at 30℃, 35℃, 40℃, 45℃, 50℃, 55℃, 60℃, 65℃, 70℃, 75℃, and 80℃, and is not specifically limited; the low-temperature vacuum drying reaction conditions of this application are relatively mild, allowing pore-forming agents such as water or ethanol to fully dry and evaporate, forming an interconnected dense pore structure, while avoiding the evaporation of aroma or the destruction of aroma substances by high temperature caused by high-temperature baking, resulting in a purer taste and improving the user's taste experience. Here, "liquid phase component" includes solvents such as water and ethanol, as well as liquid phase components contained in smoke-generating agents, binders, etc., and is not limited to water.

[0046] In one specific embodiment, in step S1, the solvent is water and / or ethanol. The polyol fumigant combines with the hydroxyl groups exposed by the binder in the solvent system through hydroxyl groups. At the same time, the water molecules in the dispersion system also change to a bound state. The overall mixture changes from a liquid state to a solid state. The solid mixture is then mixed with other components to form a slurry, which is then granulated. In step S2, tableting is performed. In step S3, hot air drying and expansion are used. Under hot air drying conditions, the solvent in the system overflows in order of boiling point to form pores, so that the wall material of the aerosol generation matrix forms a porous framework structure composed of continuous micropores, and finally the aerosol generation matrix is ​​obtained.

[0047] Furthermore, the preferred process parameters for hot air drying and puffing are 50-120℃, such as controlling the hot air drying temperature at 50℃, 55℃, 60℃, 65℃, 70℃, 75℃, 80℃, 90℃, 100℃, 110℃, and 120℃, etc., without specific limitations. The mass percentage of the liquid phase component in the aerosol matrix is ​​less than or equal to 5%, such as 5%, 4.5%, 4%, 3.5%, 3%, 2.5%, 2%, 1.5%, 1%, and 0.9% of the liquid phase component. The reaction conditions for hot air drying and puffing in this application are relatively mild and easy to control, allowing pore-forming agents such as water or ethanol to fully dry and evaporate, forming an interconnected dense pore structure. This also avoids the evaporation of aroma or the destruction of aroma substances by high temperature caused by high-temperature baking, resulting in a purer taste and improving the user's taste experience.

[0048] In a specific embodiment, when the solvent added in step S1 is water and does not include ethanol, the polyol fumigant combines with the hydroxyl groups exposed by the binder under aqueous conditions. Simultaneously, water molecules in the dispersion system also transform into a bound state, changing the overall mixture from liquid to solid. The solid mixture is then mixed with other components to form a slurry, which is then granulated. In step 2, tableting is performed. In step 3, a freeze-drying process is used, where sublimation transforms aqueous ice crystals into free water molecules that overflow and form pores. This results in a porous framework structure composed of continuous micropores forming the wall material of the aerosol generation matrix, ultimately yielding the aerosol generation matrix. This application uses a freeze-drying process that can form ice crystals according to the different freezing points of the mixture. The transformation of water molecules into a bound state inhibits the recrystallization of aqueous ice crystals, achieving a uniform ice crystal distribution. Simultaneously, based on the principle of water's "cold expansion and hot contraction," the matrix expands. Finally, the sublimation principle transforms the aqueous ice crystals into free water molecules that overflow. Through the freeze-drying process, freeze crystallization achieves a uniformly distributed microporous effect.

[0049] Furthermore, the preferred process parameters for freeze-drying are -10℃ to -87℃. For example, the freeze-drying process parameters can be controlled at -10℃, -12℃, -15℃, -18℃, -20℃, -22℃, -25℃, -30℃, -35℃, -40℃, -45℃, -50℃, -55℃, -60℃, -65℃, -70℃, -75℃, -80℃, -85℃, and -87℃, etc. The pre-freezing temperature, primary drying temperature, and desorption drying temperature are controlled within this range. The actual drying temperature can be appropriately modified as needed. The mass percentage of the liquid phase component in the aerosol matrix is ​​limited to less than or equal to 5%, such as 5%, 4.5%, 4%, 3.5%, 3%, 2.5%, 2%, 1.5%, 1%, and 0.9%. The hot air drying and puffing reaction conditions of this application are relatively mild and easy to control, allowing pore-forming agents such as water or ethanol to fully dry and evaporate, forming an interconnected dense pore structure. This also avoids the evaporation of aroma or the destruction of aroma substances by high temperature caused by high-temperature baking, resulting in a purer taste and improving the user's taste experience.

[0050] This application also provides an aerosol generating matrix, which has at least one through-hole. The wall material of the aerosol generating matrix is ​​a porous framework structure composed of continuous micropores, wherein the pore size of the micropores is 10 nm-20 μm and the porosity is 20%-80%. This application controls the pore size to be 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, or 900 nm. The micropores have diameters of nm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, and 20μm, with porosities of 20%, 30%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%, etc., without specific limitations. The disordered and interconnected micropores create a porous framework structure composed of continuous micropores, ensuring structural strength and increasing the contact area between external air and flue gas, resulting in more uniform mixing. During heating, aerosols are generated between the micropores and diffuse to the central airway under the user's suction force, then are drawn out through the suction end, resulting in rich flue gas during suction without significant differences between inhalations.

[0051] The following specific embodiments are used to explain and illustrate this application.

[0052] Example 1 A method for preparing an aerosol generation matrix includes the following steps: S1. Preparation of matrix precursor: A mixture of 55 parts tobacco and 10 parts aromatic plant (mint) was subjected to impact crushing until the crushed material was in the form of spindle and / or multi-rhomboid particles with an aspect ratio of approximately 3:1 and a particle size of approximately 18 μm. Then, it was placed in a vacuum-sealed environment, and an acidic treatment solution (benzoic acid solution) was added to make the final pH of the treatment system 6.8. Then, it was heated to produce aroma at a temperature of 60°C for 20 min.

[0053] Take the above-mentioned mixture of tobacco and aromatic plants, 10 parts of inorganic porous material (zeolite), 5 parts of flavor additive (rose fragrance), 2 parts of binder (pullulan), 15 parts of polyol smoke-generating agent (glycerol), and add solvent water. Mix, granulate, and preliminarily dry to form basic particles. The viscosity of the basic particles is 500 Pa·s, and the mass percentage of the liquid phase component is 10%, thus obtaining the matrix precursor.

[0054] S2. Compression molding: Add the matrix precursor to the mold. There is a vertical rod in the lower mold space of the mold. The upper mold presses and demolds. Under pressure, the compression volume ratio is 6:1, forming a matrix intermediate with an air duct.

[0055] S3. Drying and Puffing Treatment: The aerosol-generating matrix formed in step S2 undergoes a secondary drying and puffing treatment, specifically low-temperature vacuum drying and puffing. The process parameters for low-temperature vacuum drying and puffing are: pressure 15 kPa, temperature 80℃. The resulting aerosol-generating matrix has a porous framework structure as its wall material. The mass percentage of the liquid phase component in the aerosol-generating matrix is ​​approximately 4.9%. Figure 2 As shown.

[0056] Among them, aromatic plants can be replaced by at least one of the aromatic plants disclosed above; acidic treatment solution can be replaced by at least one of citric acid, lactic acid, levulinic acid, salicylic acid, and tartaric acid, as well as a mixture with benzoic acid; zeolite can be replaced by at least one of molecular sieve, diatomaceous earth, montmorillonite, alumina, silica gel, activated carbon, calcium silicate, chitosan porous material, cellulose fiber, lignin particles, clay, sepiolite, palygorskite, or a mixture with zeolite; rose fragrance can be replaced by other fragrances; pullulan can be replaced by at least one of tamarind polysaccharide and hydroxypropyl methylcellulose, or a mixture with pullulan; glycerin can be replaced by at least one of propylene glycol, butylene glycol, and glycerol, or a mixture with glycerin.

[0057] Example 2 A method for preparing an aerosol generation matrix includes the following steps: S1. Preparation of matrix precursor: Take 50 parts tobacco and 30 parts aromatic plant (mint), 20 parts inorganic porous material (10 parts zeolite and 10 parts montmorillonite), 10 parts flavor additive (lily fragrance), 1 part binder (pullulan), 30 parts polyol smoke agent (glycerol), and add ethanol. Mix, granulate, and preliminarily dry to form basic particles. The viscosity of the basic particles is 1000 Pa·s, and the mass percentage of the liquid phase component is 25%, thus obtaining the matrix precursor.

[0058] S2. Compression molding: Add the matrix precursor to the mold. There are three vertical rods in the lower mold space. Press and demold the upper mold. Under pressure, the compression volume ratio is 4:1, forming a matrix intermediate with 3 air pores.

[0059] S3. Drying and puffing treatment: The aerosol generation matrix formed in step S2 is subjected to a secondary drying and puffing treatment, which is low-temperature hot air drying and puffing. The process parameters for hot air drying and puffing are 50°C, forming an aerosol generation matrix with a liquid phase component mass percentage of about 4.5%. The wall material of the aerosol generation matrix is ​​a porous skeleton structure composed of continuous micropores.

[0060] Example 3 A method for preparing an aerosol generation matrix includes the following steps: S1. Preparation of matrix precursor: Take 25 parts tobacco and 5 parts aromatic plant (mint), 15 parts inorganic porous material (10 parts zeolite and 5 parts montmorillonite), 7 parts flavor additive (lily fragrance), 5 parts binder (pullulan), 10 parts polyol smoke agent (glycerol), add 3 parts electromagnetic induction material (iron powder), and add solvent water. Mix, granulate, and preliminarily dry to form basic particles. The viscosity of the basic particles is 1500 Pa·s, and the mass percentage of the liquid phase component is 50%, thus obtaining the matrix precursor.

[0061] S2. Compression molding: Add the matrix precursor to the mold. There is a vertical rod in the lower mold space of the mold. Press and demold the upper mold. Under pressure, the compression volume ratio is 10:3, forming a matrix intermediate with one air pore.

[0062] S3. Drying and puffing treatment: The aerosol generating matrix formed in step S2 is subjected to a secondary drying and puffing treatment using a freeze-drying process. The process parameters for the freeze-drying process are -10℃ to -87℃, resulting in an aerosol generating matrix with a liquid phase component mass percentage of approximately 1.2%. The wall material of the aerosol generating matrix is ​​a porous framework structure composed of continuous micropores, thus obtaining the aerosol generating matrix.

[0063] Comparative Example 1 In Comparative Example 1, except for step S1 where the tobacco and aromatic plants were not subjected to impact crushing, heating, or acid treatment, all other steps, process parameters, and proportions were the same as in Example 1.

[0064] Comparative Example 2 In Comparative Example 2, except for the vacuum drying process parameters used in step S3 which are different from those in Example 1, the other steps, process parameters, and proportions are the same as in Example 1; the vacuum drying process parameters used in Comparative Example 2 are 100℃ and 90kPa.

[0065] Comparative Example 3 In this comparative example 3, except for the hot air drying process parameters used in step S3 which are different from those in example 2, the other steps, process parameters, and proportions are the same as those in example 2; the vacuum drying process parameters used in this comparative example 3 are 150°C.

[0066] Comparative Example 4 In this comparative example 4, except for the freeze-drying process parameters used in step S3 which are different from those in example 2, all other steps, process parameters, and proportions are the same as in example 3; the freeze-drying process parameters used in this comparative example 4 are -20~20℃.

[0067] Comparative Example 5 A method for preparing an aerosol generation matrix includes the following steps: 55 parts tobacco and 10 parts aromatic plant (mint) were crushed into powder; then mixed with 10 parts inorganic porous material (zeolite), 5 parts flavor additive (rose essence), 2 parts binder (pullulan), and 15 parts polyol smoke-generating agent (glycerin), and shaped by injection molding or compression molding, cut into segments, and dried to obtain an aerosol generating matrix; scanning electron microscopy was performed on the aerosol generating matrix, and it was found that its wall material did not form a porous framework structure composed of continuous micropores.

[0068] The aerosol-generating matrices of Examples 1-3 and Comparative Examples 1-5 were subjected to performance tests. The test standards were in accordance with ISO 20778-2018 Cigarettes—Routine analysis of cigarette smoking machines—Definition and standard conditions of strong smoking regimes, YC / T 138 Sensory evaluation method for tobacco and tobacco products, and YC / T 156 Determination of nicotine in total particulate matter of cigarettes by gas chromatography. The test results are shown in Table 1.

[0069] Table 1. Performance test results of aerosol generation matrices in Examples 1-3 and Comparative Examples 1-5 The test results of the aerosol-generated matrices in Examples 1-3 and Comparative Examples 1-5 show that: by crushing, acidifying, and vacuum heating the tobacco and / or aromatic plants, this application helps to reduce irritation, achieve cell wall disruption, and transfer the aroma substances inside the cells to the surface. When heated without burning, the aroma is more easily released, the aroma is more mellow, and the user's experience and taste are improved. This application adds pore-forming agents such as water or ethanol during the preparation process and performs secondary drying on the matrix intermediate, so that the wall material forms a porous skeleton structure composed of continuous micropores, which ensures structural strength and increases the contact area between the outside air and the smoke, resulting in more uniform smoke mixing and rich smoke when inhaled.

[0070] Comparative Example 1 shows that the lack of aroma pretreatment for tobacco and aromatic plants hinders aroma release and affects the taste. Comparative Example 2 shows that using unsuitable vacuum drying parameters leads to the volatilization of aroma-producing substances, damaging their structure and hindering the formation of a porous framework structure composed of continuous micropores in the wall material of the aerosol generation matrix, thus affecting the taste. Comparative Example 3 shows that using unsuitable hot air drying parameters also leads to the volatilization of aroma-producing substances, damaging their structure and hindering the formation of a porous framework structure composed of continuous micropores in the wall material of the aerosol generation matrix. The porous skeleton structure affects the taste. As shown in Comparative Example 4, using unsuitable freeze-drying parameters can also lead to the volatilization of aroma-producing substances, damaging their structure and hindering the formation of a porous skeleton structure composed of continuous micropores in the wall material of the aerosol generation matrix, thus affecting the taste. As shown in Comparative Example 5, the absence of a pore-forming agent and the lack of secondary drying of the matrix intermediates resulted in the wall material of the aerosol generation matrix failing to form a porous skeleton structure composed of continuous micropores or the porous skeleton structure cracking, severely affecting the release of smoke and aroma characteristics, and thus affecting the taste.

[0071] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method for preparing an aerosol generation matrix, characterized in that, Includes the following steps: S1. Preparation of matrix precursor: Take pretreated tobacco and / or aromatic plants, inorganic porous materials, polyol smoke generators, flavor additives and binders, and add solvents, namely water and / or ethanol, to prepare slurry, granulate and pre-dry to form basic particles. The viscosity of the formed basic particles is 500-1500 Pa·s, which is the matrix precursor. S2. Compression molding: By feeding the matrix precursor into the mold, the polymer volume ratio is compressed to 6:1-10:3 under pressure, and then demolded to form a matrix intermediate with at least one axial air channel pore. S3. Drying and puffing treatment: The matrix intermediate formed in step S2 is subjected to a second drying and puffing treatment to allow the solvent in the system to overflow and form pores, forming an aerosol generation matrix. The wall material of the aerosol generation matrix is ​​a porous framework structure composed of continuous micropores. The pore size of the micropores of the formed aerosol generation matrix is ​​10nm-20μm, and the porosity is 20%-80%.

2. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S1, the mass percentage of the liquid phase component in the matrix precursor is 10-50%.

3. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S1, the pretreatment of tobacco and / or aromatic plants includes crushing the tobacco and / or aromatic plants by impact; then placing the above materials in a vacuum-sealed environment, adding an acidic treatment solution, and heating them at a temperature of 60-120°C, so that the volume of the tobacco and / or aromatic plants expands by 1.1-1.5 times.

4. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S1, the inorganic porous material includes at least one of zeolite, molecular sieve, diatomaceous earth, montmorillonite, alumina, silica gel, activated carbon, calcium silicate, sepiolite, and palygorskite; and / or, the polyol smoke-generating agent includes at least one of glycerol, propylene glycol, butylene glycol, and glycerol; and / or, the flavor additive is an extract of tobacco and / or an extract of aromatic plants; and / or, the binder includes one or more combinations of pullulan, tamarind polysaccharide, and hydroxypropyl methylcellulose.

5. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S1, the matrix precursor is prepared by the following parts by weight of raw materials: 30-80 parts of tobacco and / or aromatic plants, 10-30 parts of polyol smoke-generating agent, 0-5 parts of binder, 5-20 parts of inorganic porous material and 5-10 parts of flavor additive.

6. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S1, an electromagnetic induction material in a mass fraction of 0-8 parts is also added, wherein the electromagnetic induction material is at least one of iron, nickel, copper, chromium, tin, manganese, and aluminum. And / or, in step S1, 0-8 parts by weight of a resistance heating material are also added, wherein the resistance heating material includes at least one of carbon nanotubes, nickel, chromium and iron; And / or, in step S1, 0-5 parts by weight of a thermally conductive material that has undergone high-temperature impurity removal treatment are added, wherein the thermally conductive material is at least one of iron powder, copper powder, boron nitride, aluminum oxide, and carbon powder.

7. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S3, low-temperature vacuum drying and puffing are used. Under low-temperature vacuum, the solvent in the system overflows in order of boiling point to form pores, so that the wall material of the aerosol generation matrix forms a porous skeleton structure composed of continuous micropores.

8. The method for preparing the aerosol generation matrix according to claim 7, characterized in that, The process parameters for low-temperature vacuum drying and puffing are: temperature 30-80℃, pressure 15kpa~85kpa.

9. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S3, hot air drying and puffing are used. Under hot air drying conditions, the solvent in the system overflows in order of boiling point to form pores, so that the wall material of the aerosol generation matrix forms a porous skeleton structure composed of continuous micropores.

10. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, When the solvent added in step S1 is water, in step S3, a freeze-drying process is used to transform the aqueous ice crystals into free water molecules that overflow and form pores, so that the wall material of the aerosol generation matrix forms a porous framework structure composed of continuous micropores.

11. The method for preparing the aerosol-generating matrix according to claim 1, characterized in that, In step S2, there is at least one vertical rod in the lower die space of the mold. After the upper die is stamped, an axial air passage hole that matches the shape of the rod is stamped out.

12. An aerosol generation matrix, characterized in that, The aerosol generating matrix is ​​prepared using the preparation method according to any one of claims 1-11, wherein the aerosol generating matrix has at least one axial airway pore, and the wall material of the aerosol generating matrix is ​​a porous framework structure composed of continuous micropores, wherein the pore size of the micropores is 10nm-20μm and the porosity is 20%-80%.

13. The aerosol generation matrix according to claim 12, characterized in that, The raw materials include the following parts by weight: 30-80 parts tobacco and / or aromatic plants, 10-30 parts polyol smoke-generating agent, 0-5 parts binder, 5-20 parts inorganic porous material and 5-10 parts flavor additive.

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