An aerosol-generating article having uniform heating and a method of manufacturing the same

Abstract

The patent provides a high-thermal-conductivity composite material, which comprises a non-silicon-based mesoporous material and a two-dimensional nanosheet material, and the two-dimensional nanosheet material comprises graphene, boron nitride and MXene; a single-micelle interface assembly method is proposed, which realizes the preparation of the above-mentioned composite material, synthesizes two-dimensional mesoporous carbon nanosheet@GO, two-dimensional mesoporous carbon nanosheet@BN and two-dimensional mesoporous carbon nanosheet@MXene; a high-thermal-conductivity aerosol generating substrate is provided, and the results of the aerosol generating substrate containing the three composite materials in the thermal conductivity performance test show that the addition of the composite material significantly improves the thermal conductivity efficiency in the heated cigarette and optimizes the heating uniformity of the tobacco leaf; a preparation method of a high-thermal-conductivity aerosol generating substrate is provided, and the high-thermal-conductivity composite material is added to prepare a filamentous high-thermal-conductivity aerosol generating substrate by the method.

Description

Technical Field

[0001] This patent relates to the field of tobacco processing technology, and in particular to a uniformly heated aerosol-generating product and its preparation method. Background Technology

[0002] Heated cigarettes heat the tobacco in the smoking section, causing the atomizing medium, aroma components, flavorings, and nicotine to form an aerosol, which is then inhaled to provide the characteristic tobacco sensation. However, due to limitations such as the area of ​​the heating element, only a small portion of the tobacco directly contacts the heating element. The majority of the tobacco is heated through internal heat conduction, surface heat conduction between tobacco strands, and forced convection heat transfer between the inhaled airflow and the tobacco. Therefore, during the heating process, heat conduction in the smoking section is often uneven, resulting in inconsistent component release from different areas. Tobacco near the heat source has a higher temperature, allowing for better atomization and volatilization of the atomizing medium, aroma components, and flavorings. Conversely, tobacco further from the heat source has a lower temperature, and the volatile substances in the tobacco cannot be effectively atomized and volatilized. Improving the thermal conductivity of reconstituted tobacco, enabling faster heat transfer from the heating element to the tobacco further away, is a reasonable strategy to promote the atomization and release of volatile substances in tobacco. This will reduce the waste of raw materials, and more importantly, it will help improve the problems of insufficient smoke, low concentration of aroma components, and poor inhalation and release characteristics of heated cigarettes.

[0003] The main additives used to improve the thermal conductivity of raw materials for heated tobacco products are metals, metal oxide ceramics, silicon carbide ceramics, carbon fibers, graphene, carbon nanotubes, and diamond. For example, the Institute of Physics and Chemistry of the Chinese Academy of Sciences sprays carbon nanotubes onto the surface of tobacco sheets (publication number CN112137159B). However, this spraying method only applies carbon nanotubes to the surface of the sheet, making it difficult to improve heat transfer within the sheet. Furthermore, surface spraying may result in uneven distribution of carbon nanotubes on the sheet surface. Guangxi China Tobacco Industry Co., Ltd. impregnates reconstituted tobacco leaves in a graphene nanosheet dispersion (publication number CN110169589A). However, this impregnation method significantly alters the reconstituted tobacco leaf preparation process, and its application in actual production remains challenging. Hubei China Tobacco Industry Co., Ltd. mixes metal powder into tobacco powder (publication number CN108741206A). However, applying metal powder to tobacco leaves poses significant risks to biosafety. Summary of the Invention

[0004] To improve the thermal conductivity of the aerosol generation matrix, enhance its raw material utilization and heating uniformity, and thereby increase the amount of smoke generated by aerosol products, this patent provides the following technical solutions:

[0005] Firstly, a high thermal conductivity aerosol generating matrix is ​​provided. The components of the aerosol generating matrix, by weight, include: 1-20 parts of a high thermal conductivity composite material, specifically 1-3 parts, 3-6 parts, 6-9 parts, 9-12 parts, 12-15 parts, 15-18 parts, or 18-20 parts; 50-400 parts of tobacco powder, specifically 50-400 parts, 50-100 parts, 100-150 parts, 150-200 parts, 200-250 parts, 250-300 parts, 300-350 parts, or 350-400 parts; and 10-100 parts of an atomizing agent, specifically... The quantities can be 10-100 parts, 10-20 parts, 20-30 parts, 30-40 parts, 40-50 parts, 50-60 parts, 60-70 parts, 70-80 parts, 80-90 parts, or 90-100 parts; the inorganic binder can be 1-10 parts, specifically 1-2 parts, 2-4 parts, 4-6 parts, 6-8 parts, or 8-10 parts; the water can be 10-100 parts, specifically 10-100 parts, 10-20 parts, 20-30 parts, 30-40 parts, 40-50 parts, 50-60 parts, 60-70 parts, 70-80 parts, 80-90 parts, or 90-100 parts.

[0006] Furthermore, the particle size of the inorganic binder is 60-120 mesh, 120-180 mesh, 180-240 mesh, 240-300 mesh, 300-360 mesh, 360-420 mesh, 420-480 mesh, or 480-500 mesh, and the particle size of the tobacco powder is 120-180 mesh, 180-240 mesh, 240-300 mesh, or 300-360 mesh.

[0007] Furthermore, the thermal conductivity of the aerosol generating matrix is ​​2.5 to 4 times that of the aerosol generating matrix without highly thermally conductive composite materials.

[0008] Furthermore, the high thermal conductivity composite material comprises a two-dimensional nanosheet substrate and a non-silicon-based mesoporous material formed on the two-dimensional nanosheet substrate. The non-silicon-based mesoporous material is selected from one or more of mesoporous carbon, transition metal oxides, phosphates and sulfides, and the two-dimensional nanosheet substrate is selected from one or more of graphene, boron nitride and MXene.

[0009] Furthermore, the high thermal conductivity composite material is selected from one or more of the following: two-dimensional mesoporous carbon nanosheets@graphene, two-dimensional mesoporous carbon nanosheets@boron nitride, and two-dimensional mesoporous carbon nanosheets@Mxene.

[0010] Furthermore, the shape of the aerosol generating matrix can be strip-shaped, sheet-shaped, filament-shaped, or rod-shaped.

[0011] Furthermore, the tobacco powder is selected from one or more of flue-cured tobacco, aromatic tobacco, burley tobacco, and sun-cured tobacco.

[0012] Furthermore, the atomizing agent is selected from one or more of glycerol, propylene glycol, butanediol, and glycerol.

[0013] Furthermore, the inorganic binder is selected from one or more of kaolin, bentonite, clay, sodium carboxymethyl cellulose, and sodium alginate.

[0014] Furthermore, the aerosol generation matrix is ​​prepared by the following steps: S1: preparing a mixed solution containing an atomizing agent and water; S2: preparing a mixed dry material containing a high thermal conductivity composite material, tobacco powder and an inorganic binder; S3: stirring the mixed solution and the mixed dry material evenly to obtain a mixed wet material; S4: passing the mixed wet material through rolling, drying and shredding in sequence to obtain the aerosol generation matrix.

[0015] Furthermore, the thickness of the mixed wet material after roller pressing is 0.10mm~0.15mm, 0.15mm~0.20mm or 0.20mm~0.25mm; the drying temperature is 40~100℃, 40~50℃, 50~60℃, 60~70℃, 70~80℃, 80~90℃ or 90~100℃; and the drying time is 10min~60min, 10min~20min, 20min~30min, 30min~40min, 40min~50min or 50min~60min.

[0016] Furthermore, the high thermal conductivity composite material is prepared by the following steps: A1: preparing a dispersion of a two-dimensional nanosheet substrate; A2: preparing an emulsion of a non-silicon-based mesoporous material precursor prepolymer; A3: mixing the two-dimensional nanosheet substrate dispersion and the non-silicon-based mesoporous material precursor prepolymer emulsion, adding a pH adjuster to obtain a non-silicon-based mesoporous material precursor@two-dimensional nanosheet substrate; A4: sintering the non-silicon-based mesoporous material precursor@two-dimensional nanosheet substrate to obtain the non-silicon-based mesoporous material@two-dimensional nanosheet substrate as the high thermal conductivity composite material.

[0017] Furthermore, the thermal conductivity of the aerosol generating matrix is ​​greater than or equal to 0.40 W / mK, greater than or equal to 0.45 W / mK, greater than or equal to 0.50 W / mK, greater than or equal to 0.55 W / mK, greater than or equal to 0.60 W / mK, or greater than or equal to 0.65 W / mK.

[0018] The second aspect is to provide a uniformly heated aerosol generating article, wherein the smoke-generating section of the aerosol generating article includes the aforementioned aerosol generating matrix.

[0019] Furthermore, the thermal conductivity of the smoke-generating section is greater than or equal to 0.100 W / mK, greater than or equal to 0.101 W / mK, greater than or equal to 0.102 W / mK, greater than or equal to 0.103 W / mK, greater than or equal to 0.104 W / mK, greater than or equal to 0.105 W / mK, greater than or equal to 0.106 W / mK, greater than or equal to 0.107 W / mK, greater than or equal to 0.108 W / mK, greater than or equal to 0.109 W / mK, or greater than or equal to 0.110 W / mK.

[0020] Thirdly: The preparation method of the above-mentioned aerosol generating matrix includes the following steps: S1: preparing a mixed solution containing an atomizing agent and water; S2: preparing a mixed dry material containing a high thermal conductivity composite material, tobacco powder and an inorganic binder; S3: stirring the mixed solution and the mixed dry material evenly to obtain a mixed wet material; S4: passing the mixed wet material through rolling, drying and cutting into shreds to obtain the aerosol generating matrix.

[0021] This patent has the following beneficial effects:

[0022] 1. This patent provides a composite material with high thermal conductivity, comprising a non-silicon-based mesoporous material and a two-dimensional nanosheet material. The two-dimensional nanosheet material includes graphene, boron nitride and MXene. By combining these two-dimensional nanosheets with the non-silicon-based mesoporous material, it is expected that the thermal management performance of the composite material can be significantly improved.

[0023] 2. This patent proposes a single micelle interface assembly method, which realizes the preparation of the above-mentioned high thermal conductivity composite material and synthesizes three composite materials: two-dimensional mesoporous carbon nanosheets @GO, two-dimensional mesoporous carbon nanosheets @BN, and two-dimensional mesoporous carbon nanosheets @MXene.

[0024] 3. This patent provides a high thermal conductivity aerosol generating matrix, which includes the above three high thermal conductivity composite materials. The results of thermal conductivity performance tests on the aerosol generating matrix containing these three high thermal conductivity composite materials show that the addition of high thermal conductivity composite materials not only significantly improves the thermal conductivity efficiency in heated cigarettes, but also optimizes the heating uniformity of tobacco leaves by precisely controlling the size, dimensions, pores and micro-nano structures of the materials.

[0025] 4. This patent provides a method for preparing a high thermal conductivity aerosol generating matrix, which involves adding a high thermal conductivity composite material to prepare a filamentous high thermal conductivity aerosol generating matrix. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this patent, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this patent and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a scanning electron microscope image of the composite material in Example 1 of this patent;

[0028] Figure 2 This is a high-resolution transmission electron microscope image of the composite material in Example 1 of this patent;

[0029] Figure 3a This is a nitrogen adsorption curve of the composite material in Example 1 of this patent;

[0030] Figure 3b This is a pore size distribution diagram of the composite material in Example 1 of this patent;

[0031] Figure 4 This is a thermogravimetric curve of the composite material in Example 1 of this patent;

[0032] Figure 5 The XRD pattern of the composite material in Example 1 of this patent;

[0033] Figure 6 The Raman spectrum of the composite material in Example 1 of this patent;

[0034] Figure 7 This is a scanning electron microscope image showing the thickness characterization of the composite material in Example 1 of this patent;

[0035] Figure 8a This is a scanning electron microscope image of the aerosol generation matrix in Example 1 of this patent;

[0036] Figure 8b This is a scanning electron microscope image of the aerosol generation matrix in Example 1 of this patent;

[0037] Figure 9 This is a scanning electron microscope image of the composite material in Example 2 of this patent;

[0038] Figure 10a This is a scanning electron microscope image of the aerosol generation matrix in Example 2 of this patent;

[0039] Figure 10b This is a scanning electron microscope image of the aerosol generation matrix in Example 2 of this patent;

[0040] Figure 11 This is a scanning electron microscope image of the composite material in Example 3 of this patent.

[0041] Figure 12a This is a scanning electron microscope image of the aerosol generation matrix in Example 3 of this patent;

[0042] Figure 12b This is a scanning electron microscope image of the aerosol generation matrix in Example 3 of this patent;

[0043] Figure 13 The bar charts are of the thermal conductivity test results of Examples 1-3 and Comparative Example 1 of this patent.

[0044] Figure 14 The graphs show the temperature change over time of the outer wall of the smoke-generating section in the embodiments and comparative examples of this patent. Detailed Implementation

[0045] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0046] The terminology used in this patent is for the purpose of describing particular embodiments only and is not intended to be limiting of the patent. The singular forms “a,” “the,” and “the” used in this patent and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0047] It should be understood that although the terms "first," "second," "third," etc., may be used in this patent to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this patent, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this patent, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] Specifically, the preparation method of the aerosol generation matrix of this patent includes the following steps:

[0049] S1: Preparation of mixed solution:

[0050] The mixed solution includes an atomizing agent and water. The atomizing agent and water are taken and stirred evenly to obtain the mixed solution.

[0051] The atomizing agent includes one or more of glycerol, propylene glycol, butanediol, and glycerol, with glycerol being the preferred one.

[0052] S2: Preparation of mixed dry materials:

[0053] The mixed dry material includes an inorganic binder, a composite material, and tobacco powder; to prepare a high thermal conductivity composite material, the inorganic binder, the high thermal conductivity composite material, and the tobacco powder are mixed evenly to obtain the mixed dry material.

[0054] Tobacco powder includes one or more of flue-cured tobacco, aromatic tobacco, burley tobacco, and sun-cured tobacco, and in particular, flue-cured tobacco powder.

[0055] Inorganic binders include one or more of kaolin, bentonite, clay, sodium carboxymethyl cellulose, and sodium alginate, particularly sodium carboxymethyl cellulose.

[0056] Specifically, the particle size of the inorganic binder is 60-120 mesh, 120-180 mesh, 180-240 mesh, 240-300 mesh, 300-360 mesh, 360-420 mesh, 420-480 mesh, or 480-500 mesh, and the particle size of the tobacco powder is 120-180 mesh, 180-240 mesh, 240-300 mesh, or 300-360 mesh.

[0057] Preparation of high thermal conductivity composite materials:

[0058] 1. Experimental reagents and instruments

[0059] Experimental reagents: Triblock polyethylene oxide-polypropylene oxide-polyethylene oxide Pluronic F127 (PEO106PPO70PEO106, M=12600) and dopamine hydrochloride (DA) were purchased from Sigma-Aldrich; ammonia, thiobenzene (TMB), ethanol, etc. were purchased from Shanghai Chemical Reagent Company or Sinopharm Chemical Reagent Co., Ltd.; high-purity ammonia (99.99%) was purchased from Sinopharm Chemical Reagent Co., Ltd.; all reagents were used directly without further purification before use; the water used in the experiment was high-purity deionized water.

[0060] Experimental consumables: round-bottom flask; dropper; pH test paper; pipette.

[0061] Experimental apparatus: centrifuge; multi-point stirrer; tube furnace.

[0062] 2. Preparation method

[0063] A high thermal conductivity composite material is disclosed, in which dopamine hydrochloride is used as a source agent to provide carbon and nitrogen; a commercially available amphiphilic triblock copolymer PEO-PPO-PEO is used as a surfactant and provides a template; thiomethylbenzene is used as a pore expander; ammonia water is used as a pH adjuster and also acts as a catalyst; a mixed solution of alcohol and water is used as a solvent; the dispersion includes graphene dispersion, boron nitride dispersion, and Mxene dispersion; the intermediate product is a two-dimensional mesoporous polydopamine composite nanosheet material; and the high thermal conductivity composite material is a two-dimensional mesoporous composite carbon material.

[0064] A method for preparing a high thermal conductivity composite material includes the following steps:

[0065] A1: Dispersion for preparing two-dimensional nanosheet substrates;

[0066] A2: Emulsion for preparing precursor prepolymers of non-silicon-based mesoporous materials;

[0067] A3: Mix the two-dimensional nanosheet substrate dispersion and the non-silicon-based mesoporous material precursor prepolymer emulsion, add a pH adjuster, and obtain the non-silicon-based mesoporous material precursor@two-dimensional nanosheet substrate;

[0068] A4: Sinter the non-silicon-based mesoporous material precursor@2D nanosheet substrate to obtain the non-silicon-based mesoporous material@2D nanosheet substrate as the high thermal conductivity composite material.

[0069] Specifically, ethanol solvent and water are mixed at a volume ratio of 1:1 to prepare an ethanol-water solution of 50–150 ml. Then, dopamine hydrochloride and the amphiphilic triblock copolymer PEO-PPO-PEO surfactant are added to the ethanol-water mixture and stirred to dissolve, forming a micelle system and yielding a transparent solution. Next, hydrophobic organic small molecule thiobenzene is added to the micelle system and stirred to form a colloidal solution of a nanoemulsion system. The nanoemulsion system is continuously stirred, and after stabilization, graphene dispersion, boron nitride dispersion, or Mxene dispersion and 1.5–3 ml of concentrated ammonia are added. After the nanoemulsion system has completely reacted, it is centrifuged and washed to obtain a two-dimensional mesoporous polydopamine composite nanosheet material. Finally, the two-dimensional mesoporous polydopamine composite nanosheet material is calcined in nitrogen at a temperature range of 500–1200 °C, a speed of 0.5–10 °C / min, and a time range of 1–9 h to obtain a two-dimensional mesoporous composite carbon material.

[0070] The high thermal conductivity composite material comprises a two-dimensional nanosheet substrate and a non-silicon-based mesoporous material formed on the two-dimensional nanosheet substrate. The non-silicon-based mesoporous material is one or more of mesoporous carbon, transition metal oxides, phosphates and sulfides, particularly mesoporous carbon. The two-dimensional nanosheet substrate is one or more of graphene, boron nitride and MXene.

[0071] High thermal conductivity composite materials include one or more of the following: two-dimensional mesoporous carbon nanosheets@graphene, two-dimensional mesoporous carbon nanosheets@boron nitride, and two-dimensional mesoporous carbon nanosheets@Mxene.

[0072] S3: Mix the mixed solution and the mixed dry material thoroughly to obtain the mixed wet material:

[0073] Pour the prepared mixed solution into the dry mixed material that is being stirred to obtain the wet mixed material.

[0074] The mixed wet materials include mixed wet materials containing composite two-dimensional mesoporous carbon nanosheets@graphene, mixed wet materials containing composite two-dimensional mesoporous carbon nanosheets@boron nitride, and mixed wet materials containing composite two-dimensional mesoporous carbon nanosheets@Mxene.

[0075] S4: The mixed wet material is sequentially rolled, dried, and shredded to obtain the aerosol generation matrix:

[0076] The thickness of the mixed wet material after roller pressing is 0.10mm to 0.25mm, specifically 0.10mm to 0.15mm, 0.15mm to 0.20mm, or 0.20mm to 0.25mm.

[0077] The mixed wet material is dried and cut into filaments of a certain length and width to form the aerosol generation matrix. The temperature and time of the drying process significantly affect the quality of the aerosol generation matrix. The drying temperatures are 40–100℃, 40–50℃, 50–60℃, 60–70℃, 70–80℃, 80–90℃, or 90–100℃, and the times are 10 min–60 min, 10 min–20 min, 20 min–30 min, 30 min–40 min, 40 min–50 min, or 50 min–60 min.

[0078] Aerosol generation matrices include aerosol generation matrices containing composite two-dimensional mesoporous carbon nanosheets@graphene, aerosol generation matrices containing composite two-dimensional mesoporous carbon nanosheets@boron nitride, and aerosol generation matrices containing composite two-dimensional mesoporous carbon nanosheets@Mxene.

[0079] Specifically, the components of the aerosol generating matrix, by weight, include: 1-20 parts of a high thermal conductivity composite material, specifically 1-3 parts, 3-6 parts, 6-9 parts, 9-12 parts, 12-15 parts, 15-18 parts, or 18-20 parts; 50-400 parts of tobacco powder, specifically 50-400 parts, 50-100 parts, 100-150 parts, 150-200 parts, 200-250 parts, 250-300 parts, 300-350 parts, or 350-400 parts; and 10-100 parts of atomizing agent, specifically 10-100 parts. 10-20 parts, 20-30 parts, 30-40 parts, 40-50 parts, 50-60 parts, 60-70 parts, 70-80 parts, 80-90 parts or 90-100 parts; 1-10 parts of inorganic binder, specifically 1-2 parts, 2-4 parts, 4-6 parts, 6-8 parts or 8-10 parts; 10-100 parts of water, specifically 10-100 parts, 10-20 parts, 20-30 parts, 30-40 parts, 40-50 parts, 50-60 parts, 60-70 parts, 70-80 parts, 80-90 parts or 90-100 parts.

[0080] Preferably, the components of the aerosol generating matrix, by weight, include: 5-6 parts, 6-7 parts, 7-8 parts, 8-9 parts, or 9-10 parts of two-dimensional mesoporous carbon nanosheets@graphene composite material; 100-150 parts, 150-200 parts, 200-250 parts, or 250-300 parts of flue-cured tobacco powder; 40-50 parts, 50-60 parts, 60-70 parts, or 70-80 parts of glycerol atomizing agent; 1-2 parts, 2-3 parts, 3-4 parts, or 4-5 parts of sodium carboxymethyl cellulose inorganic binder; and 40-50 parts, 50-60 parts, 60-70 parts, or 70-80 parts of water.

[0081] Preferably, the components of the aerosol generating matrix, by weight, include: 5-6 parts, 6-7 parts, 7-8 parts, 8-9 parts, or 9-10 parts of two-dimensional mesoporous carbon nanosheets@boron nitride composite material; 100-150 parts, 150-200 parts, 200-250 parts, or 250-300 parts of flue-cured tobacco powder; 40-50 parts, 50-60 parts, 60-70 parts, or 70-80 parts of glycerol atomizing agent; 1-2 parts, 2-3 parts, 3-4 parts, or 4-5 parts of sodium carboxymethyl cellulose inorganic binder; and 40-50 parts, 50-60 parts, 60-70 parts, or 70-80 parts of water.

[0082] Preferably, the components of the aerosol generating matrix, by weight, include: 5-6 parts, 6-7 parts, 7-8 parts, 8-9 parts, or 9-10 parts of two-dimensional mesoporous carbon nanosheets@Mxene composite material; 100-150 parts, 150-200 parts, 200-250 parts, or 250-300 parts of flue-cured tobacco powder; 40-50 parts, 50-60 parts, 60-70 parts, or 70-80 parts of glycerol atomizing agent; 1-2 parts, 2-3 parts, 3-4 parts, or 4-5 parts of sodium carboxymethyl cellulose inorganic binder; and 40-50 parts, 50-60 parts, 60-70 parts, or 70-80 parts of water.

[0083] Specifically, the molecular formula of Mxene is Ti3C2T x .

[0084] Specifically, two-dimensional mesoporous carbon nanosheets@graphene and two-dimensional mesoporous carbon nanosheets@GO, and two-dimensional mesoporous carbon nanosheets@boron nitride and two-dimensional mesoporous carbon nanosheets@BN are different expressions of the same substance.

[0085] Example 1

[0086] First, 1.0 g of Pluronic F127 and 0.5 g of dopamine hydrochloride were dissolved in 100 mL of an ethanol-water solution (ethanol to water volume ratio 1:1) to obtain a Pluronic F127 / DA micelle system. After complete dissolution, 2 mL of TMB (3,3',5,5'-tetramethylbenzidine) was added to form a Pluronic F127 / TMB / DA nanoemulsion system. The system was stirred continuously at 400 rpm for 15 min to ensure complete stabilization. Then, 5 mL of graphene dispersion was added, followed by 5 mL of concentrated ammonia to catalyze micelle polymerization assembly. After 24 hours of continuous assembly, the two-dimensional mesoporous polydopamine@two-dimensional nanosheets could be obtained by centrifugation. It should be noted that before centrifugation, an equal volume of ethanol to the mother liquor can be added to reduce the solvent density, and centrifugation should be performed at 10,000 rpm. After the sample was dried, it was carbonized at 800℃ in an N2 atmosphere with a heating rate of 1℃ / min to obtain mesoporous carbon@two-dimensional mesoporous nanosheets. A two-dimensional mesoporous carbon nanosheet@graphene composite material was thus prepared.

[0087] Its scanning electron microscope images are as follows Figure 1 As shown, the high-resolution transmission electron microscope image is as follows: Figure 2 As shown in Figure 3A, the nitrogen adsorption curve is shown in Figure 3B, the pore size distribution is shown in Figure 3C, and the thermogravimetric curve is shown in Figure 3D. Figure 4 As shown, the XRD pattern is as follows Figure 5 As shown, the Raman spectrum is as follows Figure 6 As shown, the thickness characterization scanning electron microscope image is as follows: Figure 7 As shown.

[0088] The prepared two-dimensional mesoporous carbon nanosheets@graphene composite material has a BET specific surface area of ​​309 m2 / g, a pore size of 8.2 nm, a thickness of 35 nm, and an average lateral dimension of 4-10 μm.

[0089] First, 6g of glycerol (Shanghai Aladdin Biochemical Technology Co., Ltd., purity ≥99.5%) and 6g of water were mixed evenly to form a mixed solution for later use. Then, 20g of flue-cured tobacco powder (Shanghai New Tobacco Products Research Institute Co., Ltd.), 1g of two-dimensional mesoporous carbon nanosheets@graphene composite material, and 0.5g of sodium carboxymethyl cellulose (Shanghai Changguang Enterprise Development Co., Ltd.) were mixed to form a dry mixed material. The mixed solution was poured into the dry mixed material to obtain a wet mixed material. Finally, the wet mixed material was pressed stepwise using a roller press to form a wet mixed material with a thickness of 0.15mm. After drying at 60℃ for 10 minutes and cutting into shreds, the aerosol generation matrix C1 was obtained. Its scanning electron microscope image is shown below. Figure 8a and 8b As shown.

[0090] Example 2

[0091] First, 1.0 g of Pluronic F127 and 0.5 g of dopamine hydrochloride were dissolved in 100 mL of an ethanol-water solution (ethanol to water volume ratio 1:1) to obtain a Pluronic F127 / DA micelle system. After complete dissolution, 2 mL of TMB was added to form a Pluronic F127 / TMB / DA nanoemulsion system. The system was stirred continuously at 400 rpm for 15 min to ensure complete stabilization. Then, an appropriate amount of boron nitride dispersion was added, and finally, 5 mL of concentrated ammonia was added to catalyze micelle polymerization assembly. After continuous assembly for 24 hours, two-dimensional mesoporous polydopamine@two-dimensional nanosheets could be obtained by centrifugation. It should be noted that before centrifugation, an equal volume of ethanol to the mother liquor can be added to reduce the solvent density, and centrifugation should be performed at 10,000 rpm. After the sample was dried, it was carbonized at 800℃ in a N2 atmosphere at a heating rate of 1℃ / min to obtain mesoporous carbon@two-dimensional mesoporous nanosheets. Electron microscopy images of the prepared two-dimensional mesoporous carbon nanosheets@boron nitride composite material are shown below. Figure 9 As shown.

[0092] First, 6g of glycerol and 6g of water were mixed evenly to form a solution. Then, 20g of flue-cured tobacco powder, 1g of the two-dimensional mesoporous carbon nanosheets@boron nitride composite material prepared in Example 2, and 0.5g of sodium carboxymethyl cellulose were mixed to form a dry mixture. The solution was poured into the dry mixture to obtain a wet mixture. Finally, the wet mixture was pressed stepwise using a roller press to form a wet mixture with a thickness of 0.15mm. After drying at 60℃ for 10 minutes and shaving, the aerosol-generating matrix C2 was obtained. Its scanning electron microscope image is shown below. Figure 10a and 10b As shown.

[0093] Example 3

[0094] First, 1.0 g of Pluronic F127 and 0.5 g of dopamine hydrochloride were dissolved in 100 mL of an ethanol-water solution (ethanol to water volume ratio 1:1) to obtain a Pluronic F127 / DA micelle system. After complete dissolution, 2 mL of TMB was added to form a Pluronic F127 / TMB / DA nanoemulsion system. The system was stirred continuously at 400 rpm for 15 min to ensure complete stabilization. Then, an appropriate amount of Mxene dispersion was added, and finally, 5 mL of concentrated ammonia was added to catalyze micelle polymerization assembly. After continuous assembly for 24 hours, two-dimensional mesoporous polydopamine@two-dimensional nanosheets could be obtained by centrifugation. It should be noted that before centrifugation, an equal volume of ethanol to the mother liquor can be added to reduce the solvent density, and centrifugation should be performed at 10,000 rpm. After the sample was dried, it was carbonized at 800℃ in a N2 atmosphere at a heating rate of 1℃ / min to obtain mesoporous carbon@two-dimensional mesoporous nanosheets. Electron microscopy images of the prepared two-dimensional mesoporous carbon nanosheets@Mxene composite material are shown below. Figure 11 As shown.

[0095] First, 6g of glycerol and 6g of water were mixed evenly to form a solution. Then, 20g of flue-cured tobacco powder, 1g of the two-dimensional mesoporous carbon nanosheets@Mxene composite material obtained in Example 3, and 0.5g of sodium carboxymethyl cellulose were mixed to form a dry mixture. The solution was poured into the dry mixture to obtain a wet mixture. Finally, the wet mixture was pressed stepwise using a roller press to form a wet mixture with a thickness of 0.15mm. After drying at 60℃ for 10 minutes and shaving, the aerosol-generating matrix C3 was obtained. Its scanning electron microscope image is shown below. Figure 12a and 12b As shown.

[0096] Comparative Example 1

[0097] First, take 6g of glycerol and 6g of water and mix them evenly to prepare a mixed solution. Then, take 20g of flue-cured tobacco powder and 0.5g of sodium carboxymethyl cellulose and mix them to form a dry mixed material. Pour the mixed solution into the dry mixed material to obtain a wet mixed material. Finally, use a roller press to press the wet mixed material into a thickness of 0.15mm. After drying at 60℃ for 10 minutes and cutting into shreds, the aerosol generation matrix C4 is obtained.

[0098] Thermal conductivity test

[0099] The thermal conductivity of the aerosol generation matrices of C1 to C4 was tested using HotDisk's thin film testing module and 7854 test probe. The results are shown in Table 1.

[0100] Table 1: Test Results of Thermal Conductivity of Aerosol-Generated Matrix in Thin Film Mode

[0101]

[0102] The results showed that the thermal conductivity of C4 tobacco sheet was 0.30 W / mK, while the thermal conductivity of C1 to C3 tobacco sheets were 0.66 W / mK, 0.52 W / mK, and 0.49 W / mK, respectively, which were approximately 2.2 times, 1.7 times, and 1.6 times that of the blank tobacco sheet. Figure 13 As shown. The aerosol generating matrix prepared in this patent, by adding a composite material with high thermal conductivity, can effectively improve the thermal conductivity of the aerosol generating matrix, and its raw material utilization rate and smoke volume are significantly improved after heating.

[0103] To further illustrate the heat conduction of the heated cigarette-generating section after the reconstituted tobacco leaves are used to prepare the cigarette, thermocouples were used to test the surface temperature of the outer wall of the cigarette during the heating process. Figure 14 As shown in the figure. The results indicate that the reconstituted tobacco prepared in this invention has a significantly higher outer wall temperature compared to the comparative example, which further demonstrates the improved thermal conductivity of heated cigarettes.

[0104] The various embodiments of this patent 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 applications, or improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A high thermal conductivity aerosol generation matrix, characterized in that, The components of the aerosol generating matrix, by weight, include: High thermal conductivity composite material: 1-3 parts, 3-6 parts, 6-9 parts, 9-12 parts, 12-15 parts, 15-18 parts, or 18-20 parts; Tobacco powder in quantities of 50–400 parts, 50–100 parts, 100–150 parts, 150–200 parts, 200–250 parts, 250–300 parts, 300–350 parts, or 350–400 parts; The atomizing agent is available in quantities of 10-100 parts, 10-20 parts, 20-30 parts, 30-40 parts, 40-50 parts, 50-60 parts, 60-70 parts, 70-80 parts, 80-90 parts, or 90-100 parts. Inorganic binder: 1-2 parts, 2-4 parts, 4-6 parts, 6-8 parts, or 8-10 parts; Water 10-100 parts, 10-20 parts, 20-30 parts, 30-40 parts, 40-50 parts, 50-60 parts, 60-70 parts, 70-80 parts, 80-90 parts, or 90-100 parts.

2. The aerosol generation matrix according to claim 1, characterized in that, The inorganic binder has a particle size of 60-120 mesh, 120-180 mesh, 180-240 mesh, 240-300 mesh, 300-360 mesh, 360-420 mesh, 420-480 mesh, or 480-500 mesh, and the tobacco powder has a particle size of 120-180 mesh, 180-240 mesh, 240-300 mesh, or 300-360 mesh.

3. The aerosol generation matrix according to claim 1, characterized in that, The thermal conductivity of the aerosol generating matrix is ​​2.5 to 4 times that of the aerosol generating matrix without the high thermal conductivity composite material.

4. The aerosol generation matrix according to claim 1, characterized in that, The high thermal conductivity composite material comprises a two-dimensional nanosheet substrate and a non-silicon-based mesoporous material formed on the two-dimensional nanosheet substrate. The non-silicon-based mesoporous material is selected from one or more of mesoporous carbon, transition metal oxides, phosphates and sulfides. The two-dimensional nanosheet substrate is selected from one or more of graphene, boron nitride and MXene.

5. The aerosol generation matrix according to claim 1, characterized in that, The high thermal conductivity composite material is selected from one or more of the following: two-dimensional mesoporous carbon nanosheets@graphene, two-dimensional mesoporous carbon nanosheets@boron nitride, and two-dimensional mesoporous carbon nanosheets@Mxene.

6. The aerosol generation matrix according to claim 1, characterized in that, The aerosol generating matrix can be in the shape of a strip-shaped aerosol generating matrix, a sheet-shaped aerosol generating matrix, a filament-shaped aerosol generating matrix, or a rod-shaped aerosol generating matrix.

7. The aerosol generation matrix according to claim 1, characterized in that, The tobacco powder is selected from one or more of flue-cured tobacco, aromatic tobacco, burley tobacco, and sun-cured tobacco.

8. The aerosol generation matrix according to claim 1, characterized in that, The atomizing agent is selected from one or more of glycerol, propylene glycol, butanediol, and glycerol.

9. The aerosol generation matrix according to claim 1, characterized in that, The inorganic binder is selected from one or more of kaolin, bentonite, clay, sodium carboxymethyl cellulose, and sodium alginate.

10. The aerosol generation matrix according to claim 1, characterized in that, The aerosol generation matrix is ​​prepared by the following steps: S1: Prepare a mixed solution containing the atomizing agent and the water; S2: Prepare a mixed dry material comprising the high thermal conductivity composite material, the tobacco powder, and the inorganic binder; S3: Stir the mixed solution and the mixed dry material evenly to obtain a mixed wet material; S4: The mixed wet material is sequentially rolled, dried and shredded to obtain the aerosol generation matrix.

11. The aerosol generation matrix according to claim 9, characterized in that, The thickness of the mixed wet material after roller pressing is 0.10mm~0.15mm, 0.15mm~0.20mm or 0.20mm~0.25mm; the drying temperature is 40~100℃, 40~50℃, 50~60℃, 60~70℃, 70~80℃, 80~90℃ or 90~100℃, and the drying time is 10min~60min, 10min~20min, 20min~30min, 30min~40min, 40min~50min or 50min~60min.

12. The aerosol generation matrix according to claim 1, characterized in that, The high thermal conductivity composite material is prepared by the following steps: A1: Dispersion for preparing two-dimensional nanosheet substrates; A2: Emulsion for preparing precursor prepolymers of non-silicon-based mesoporous materials; A3: Mix the two-dimensional nanosheet substrate dispersion and the non-silicon-based mesoporous material precursor prepolymer emulsion, add a pH adjuster, and obtain the non-silicon-based mesoporous material precursor@two-dimensional nanosheet substrate; A4: Sinter the non-silicon-based mesoporous material precursor@2D nanosheet substrate to obtain the non-silicon-based mesoporous material@2D nanosheet substrate as the high thermal conductivity composite material.

13. The aerosol generation matrix according to claim 1, characterized in that, The thermal conductivity of the aerosol generating matrix is ​​greater than or equal to 0.40 W / mK, greater than or equal to 0.45 W / mK, greater than or equal to 0.50 W / mK, greater than or equal to 0.55 W / mK, greater than or equal to 0.60 W / mK, or greater than or equal to 0.65 W / mK.

14. A uniformly heated aerosol-generating product, characterized in that, The smoke-generating section of the aerosol-generating article comprises the aerosol-generating matrix of claims 1-13.

15. The aerosol-generating article according to claim 14, characterized in that, The thermal conductivity of the smoke-generating section is greater than or equal to 0.100 W / mK, greater than or equal to 0.101 W / mK, greater than or equal to 0.102 W / mK, greater than or equal to 0.103 W / mK, greater than or equal to 0.104 W / mK, greater than or equal to 0.105 W / mK, greater than or equal to 0.106 W / mK, greater than or equal to 0.107 W / mK, greater than or equal to 0.108 W / mK, greater than or equal to 0.109 W / mK, or greater than or equal to 0.110 W / mK.

16. A method for preparing the aerosol generating matrix according to any one of claims 1 to 12, comprising the following steps: S1: Prepare a mixed solution containing the atomizing agent and the water; S2: Prepare a mixed dry material comprising the high thermal conductivity composite material, the tobacco powder, and the inorganic binder; S3: Stir the mixed solution and the mixed dry material evenly to obtain a mixed wet material; S4: The mixed wet material is sequentially rolled, dried and shredded to obtain the aerosol generation matrix.

Images