Water-blocking heating tobacco matrix and heating cigarette

Abstract

The invention discloses a water-blocking heating tobacco matrix and a heating cigarette, the heating tobacco matrix comprises a tobacco source base material, an aerosol forming agent and a water-blocking isolation layer, and the heating tobacco matrix can release aerosol containing the aerosol forming agent after being heated. The water-blocking isolating layer is formed by spraying a water-blocking composition on the surface of the tobacco source base material or is formed in the tobacco source base material after the water-blocking composition and the tobacco source base material are mixed; the water-blocking composition comprises 10 parts of a film-forming agent; 0-10 parts of a reinforcing filler and 0-10 parts of a biomass film-forming material. By means of the water-blocking composition, tobacco and water are blocked to a certain extent, and the effects of adsorption, diffusion and the like of the water on the surface of the tobacco can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of new tobacco products, and particularly relates to a water-blocking heated tobacco matrix and a heated cigarette. Background Art

[0002] In recent years, new tobacco has rapidly emerged with its low health hazard attributes, attracting a large number of consumers. In particular, aerosol-generating products that are smoked in a heat-not-burn manner are increasingly popular in the consumer market because they are similar to traditional cigarettes and can effectively reduce the harm caused by smoking. Taking heated cigarettes as an example of aerosol-generating products, in actual use, they are used in combination with an aerosol-generating device, and the aerosol-generating products release aerosol through heating. Since the heating temperature is usually not very high, but at the same time, the aerosol needs to be released from the aerosol-generating products, the content of aerosol formers in the aerosol-generating products is relatively higher than that in traditional cigarettes.

[0003] For the tobacco matrix of aerosol-generating products, due to the addition of a relatively high content of hydrophilic aerosol formers such as glycerol and propylene glycol, it is extremely vulnerable to environmental influence and excessive moisture absorption during processing and storage, showing phenomena such as yellowing and staining of the appearance of aerosol-generating products. On the one hand, this reduces the quality of aerosol-generating products, and on the other hand, it also affects the aesthetic requirements of users.

[0004] To solve the problem of strong hygroscopicity of tobacco materials in aerosol-generating products, Patent CN113729269A discloses a method for preparing hydrophobic microcapsules, which uses a microcapsule shell to encapsulate aerosol formers to reduce the direct contact between aerosol formers and air. However, its process is complex and not conducive to industrial production. Patent CN110946320A discloses a moisture-proof heat-not-burn reconstituted tobacco, its preparation method and application, in which glycerophosphate is added to the reconstituted tobacco powder raw material, and its characteristic of decomposing to produce glycerol above 170°C is utilized to reduce the addition amount of glycerol. However, at the same time, phosphorus-containing compounds are released, which may affect the quality of the smoke. CN115215713A discloses a smoke agent system, in which a modified additive (a combination of one or more of alginic acid, carboxymethyl cellulose, cellulose acetate, hydroxyethylated composite modified ethyl cellulose, modified bamboo fiber, potassium alginate, gelatin, lecithin, xanthan gum, chitosan, guar gum, carob gum, shellac, polyvinyl alcohol, xanthan gum, arabic gum, locust bean gum, astragalus gum, tragacanth gum, and tween) is added to glycerol. The modified additive component contains rich hydroxyl groups, carboxyl groups and other hydrophilic groups, and its three-dimensional network structure can encapsulate water molecules in the network structure, blocking external water molecules and playing a role in locking water and preventing moisture.

[0005] It can be seen that preventing or reducing the contact between external moisture and the tobacco and aerosol former in the heated tobacco product is an effective method to reduce the hygroscopicity of the heated tobacco product. Based on this, the present invention proposes to construct a water-blocking isolation layer for the heated tobacco product through a film-forming agent, a reinforcing filler, and / or a biomass film-forming material, so as to reduce the contact between the tobacco source substrate and the aerosol former and air, thereby weakening the ability to adsorb water molecules from humid air. Summary of the Invention

[0006] The object of the present invention is to provide a water-blocking heated tobacco substrate and a heated tobacco product, so as to achieve the purpose of reducing the hygroscopicity of the tobacco substrate.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: A water-blocking heated tobacco substrate, the heated tobacco substrate includes a tobacco source substrate, an aerosol former, and a water-blocking isolation layer. After being heated, the heated tobacco substrate can release an aerosol containing the aerosol former. The water-blocking isolation layer is formed by spraying a water-blocking composition on the surface of the tobacco source substrate or formed inside the tobacco source substrate after mixing the water-blocking composition with the tobacco source substrate. The water-blocking composition includes:

[0008] Film-forming agent: 10 parts

[0009] Reinforcing filler: 0 - 10 parts

[0010] Biomass film-forming material: 0 - 10 parts.

[0011] Furthermore, the form of the heated tobacco substrate includes one or a combination of powders, granules, pellets, flakes, strips, bands, or sheets.

[0012] Furthermore, the reinforcing filler is 1 - 10 parts, the film-forming agent includes an organic synthetic film-forming material, and the reinforcing filler is an inorganic particle. The organic synthetic film-forming material and the inorganic particle have a synergistic effect in reducing the hygroscopicity of the aerosol generating article. The mass ratio of the organic synthetic film-forming material to the inorganic particle is preferably 2:3 - 3:2.

[0013] Furthermore, the organic synthetic film-forming material includes polysiloxane and / or fluororesin. The polysiloxane includes polydimethylsiloxane or polyether-modified polysiloxane.

[0014] Furthermore, the fluororesin includes perfluoroalkyl graft-modified polyethylene glycol, perfluoroalkyl graft-modified polyvinyl alcohol, or perfluoroalkyl graft-modified degradable material.

[0015] Furthermore, the degradable material includes one or a combination of substances such as dextran, cellulose, nanofibrillated cellulose, microcrystalline cellulose, lignin, starch, chitosan, sodium alginate, gelatin, guar gum, carob gum, shellac, polyvinyl alcohol, xanthan gum, arabic gum, locust bean gum, tragacanth gum, galbanum gum, sucrose, maltose, fructose, and lactose.

[0016] Furthermore, the biomass film-forming material is 1 to 10 parts.

[0017] Furthermore, the biomass film-forming material includes one or more combinations of substances such as dextran, cellulose, nanofibrillated cellulose, microcrystalline cellulose, and lignin.

[0018] Furthermore, the inorganic particles include one or more combinations of silica, alumina, activated carbon, or calcium carbonate.

[0019] Furthermore, the surface of the inorganic particles is subjected to hydrophobic modification treatment.

[0020] Furthermore, the hydrophobic modifier is a silane coupling agent, such as one or more combinations of KH-3113, KH560, n-octadecyltriethoxysilane, n-butyltriethoxysilane, and n-octyltriethoxysilane.

[0021] Furthermore, the water-blocking isolation layer is formed by configuring the water-blocking composition into a solution and spraying it, directly adding it to the heated tobacco substrate, or mixing it with the tobacco source substrate.

[0022] Furthermore, the water-blocking composition is dissolved in a solvent, and the solvent includes one or more combinations of alcohol solvents, ester solvents, ketone solvents, or hydrocarbon solvents.

[0023] Furthermore, the solvent includes one or more combinations of ethanol, isopropanol, ethyl acetate, butyl acetate, propyl acetate, and acetone.

[0024] Furthermore, the hydrocarbon solvent includes n-hexane.

[0025] Furthermore, the concentration of the water-blocking composition is 0.1 to 50 wt%, preferably 1 to 20 wt%, and more preferably 1 to 10 wt%.

[0026] Furthermore, the aerosol former is a polyol.

[0027] Furthermore, the polyol is an organic alcohol containing two or more hydroxyl groups, with a functionality of 2 to 8, preferably 2 to 4, and more preferably 3.

[0028] Furthermore, the number average molecular weight of the organic alcohol is below 500, preferably 60 to 500, preferably 80 to 200, and more preferably 80 to 150.

[0029] Furthermore, the organic alcohol includes glycerol, sorbitol, and xylitol.

[0030] Furthermore, the aerosol former includes one or more combinations of glycerol and propylene glycol.

[0031] Further, the aerosol former accounts for 5-35 wt% of the total amount of the water-resistant heated tobacco substrate. Preferably, the aerosol former accounts for 5-30 wt% of the total amount of the water-resistant heated tobacco substrate. More preferably, the aerosol former accounts for 10-15 wt% of the total amount of the water-resistant heated tobacco substrate.

[0032] Further, the mass ratio of the tobacco-derived substrate to the aerosol former is 95:5 to 60:40, preferably 90:10 to 70:30, and more preferably 85:15 to 75:25.

[0033] Further, the water-resistant composition accounts for 0.1-10 wt% of the total amount of the tobacco-derived substrate and the aerosol former, preferably 1-5 wt%, and preferably 2-4 wt%.

[0034] Further, the water-resistant barrier layer is formed over 1-72 hours at an ambient temperature of 15-100 °C.

[0035] Furthermore, the water-resistant barrier layer is a water-resistant film. The film formation of the water-resistant film is carried out under heating or at room temperature, such as heating in an oven, a water bath, an oil bath, an electric heating furnace or film formation at normal temperature. Preferably, it is formed over 6-36 hours at an ambient temperature of 25-60 °C.

[0036] Furthermore, the water-resistant barrier layer includes mixing the tobacco-derived substrate and the aerosol former to obtain a mixture, and then applying the water-resistant composition to the mixture to form a water-resistant layer by film formation.

[0037] On the other hand, the water-resistant barrier layer is formed by mixing the aerosol former with the water-resistant composition and then applying it to the tobacco-derived substrate, thereby preparing a heated tobacco substrate for a low-moisture-absorbing aerosol-generating article.

[0038] On the other hand, the water-resistant barrier layer is formed by directly mixing tobacco, the aerosol former, and the water-resistant composition to obtain a heated tobacco substrate for a low-moisture-absorbing aerosol-generating article.

[0039] Furthermore, the tobacco-derived substrate can be selected from materials such as cut tobacco, stem cuttings, expanded tobacco, or reconstituted tobacco leaves.

[0040] Furthermore, the tobacco-derived substrate can include, for example, one or more of the following forms: powder, granule, pellet, flake, strip, ribbon, or sheet.

[0041] Specifically, preparation methods including but not limited to the papermaking method, the roll pressing method, the thick slurry method, etc. can be used to prepare the tobacco-derived substrate, such as cut tobacco sheet.

[0042] In the present invention, the tobacco-based substrate may further comprise additives or auxiliaries, such as sugars, which may be glucose, sucrose, fructose or xylose, etc.; such as gums, which may be sodium carboxymethyl cellulose, gelatin, starch gum or adhesives, etc.; and may also comprise flavors, extracts, inorganic salts or organic salts, etc., for adjusting the taste, etc.

[0043] The present invention also provides a heated cigarette comprising a water-blocking heated tobacco matrix according to any one of the above solutions.

[0044] Furthermore, a water-blocking isolation layer is formed on the surface of the tobacco matrix.

[0045] Even further, a water-blocking isolation layer is formed on the surface of the heated cigarette.

[0046] Even further, the heated cigarette may comprise at least one wrapping paper, which wraps the various components of the heated cigarette into a strip, and the water-blocking composition may be applied to the wrapping paper of the heated cigarette.

[0047] On the other hand, the present invention also provides a heated cigarette, which comprises a mouthpiece element and a cooling element, and the water-blocking composition according to any one of the above solutions may be applied to any one of the elements of the heated cigarette.

[0048] Furthermore, the heated cigarette may further comprise an aerosol-generating element, and the aerosol-generating element comprises an aerosol-forming matrix, and the aerosol-forming matrix may comprise a water-blocking heated tobacco matrix to which the water-blocking composition is applied.

[0049] Even further, the heated cigarette may be adapted to be used in conjunction with an existing aerosol-generating device.

[0050] In addition, the present invention provides a method for controlling the moisture of any one of the above-mentioned heated tobacco matrices. Wherein the tobacco-based substrate, the aerosol-forming agent, and the water-blocking composition are defined as in any one of the above solutions.

[0051] The present invention provides an aerosol-generating system, which comprises an aerosol-generating device and any one of the above-mentioned heated cigarettes. After being heated in the aerosol-generating device, the heated cigarette releases an aerosol for the user to inhale.

[0052] The present invention forms a water-blocking film by directly applying the water-blocking composition material or formulating it into a solution and applying it to the surface of the tobacco-based substrate, or directly adding the water-blocking composition material into the tobacco-based substrate to form an isolation structure inside the tobacco sheet filaments, isolating the tobacco from the moisture in the environment, and further achieving the purpose of reducing the moisture absorption of the aerosol-generating article.

[0053] Since tobacco leaves themselves have a special physical structure, being a capillary porous body, they are rich in colloidal substances such as proteins and pectins, as well as hydrophilic substances such as organic salts and water-soluble sugars, and thus have hygroscopicity. The internal causes of the hygroscopicity of tobacco leaves mainly come from the adsorption and diffusion of water on the surface of tobacco leaves, the condensation of capillaries, the osmosis of colloids, and the deliquescence of crystals. In the production of the tobacco industry, tobacco leaves will be made into various tobacco materials through different processing technologies, and the original physical structure of tobacco leaves will undergo different changes; the use of different additives during the processing process will also cause obvious changes in the chemical composition of tobacco materials; the surface characteristics of tobacco materials may also change during the processing process. Therefore, different tobacco materials will exhibit different hygroscopic characteristics. The hygroscopic characteristics of tobacco materials will affect their own processing characteristics, affect the sensory quality of products in products, and have strict requirements for environmental conditions during storage.

[0054] Due to the use of a water-blocking composition in the heating tobacco substrate and the heated cigarette of the present invention, a certain barrier is formed between the tobacco and moisture, and the adsorption and diffusion of moisture on the surface of the tobacco can be reduced. Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1. The raw materials of the water-blocking composition of the present invention are easily obtained, and can in-situ react on the surface of the heating tobacco substrate, especially tobacco cut lamina shreds, to form a water-blocking film or form a water-blocking isolation layer with an isolation structure inside the tobacco cut lamina shreds. The generation conditions of the water-blocking isolation layer are mild, the preparation process of the heated cigarette of the aerosol-generating article is simple, the processability is good, and it is environmentally friendly and pollution-free.

[0056] 2. The present invention uses a biomass film-forming material, an organic synthetic film-forming material, inorganic particles, etc. as the water-blocking composition of the aerosol-generating article. By forming a water-blocking layer on the surface of the tobacco shreds, the tobacco shreds are separated from the moisture in the environment, preventing the moisture from being inhaled into the tobacco shreds, thereby achieving the purpose of reducing the moisture absorption of the cigarette from the environment.

[0057] 3. The amount of the water-blocking composition used in the present invention is small, but the effect of reducing the moisture absorption of the cigarette is remarkable, and the cost is low.

[0058] 4. The aerosol-generating article of the present invention can still maintain the original appearance and quality of the aerosol-generating article after being placed for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The above content of the present invention and the following specific embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solution.

[0060] Figure 1 is a schematic diagram of the water-blocking heating tobacco substrate of the present invention;

[0061] Figure 2 It is the electron microscope scanning image of the water-blocking heated tobacco substrate of the third embodiment of the present invention;

[0062] Figure 3 It is the electron microscope scanning image of the heated tobacco substrate of the comparative example of the present invention;

[0063] Figure 4 It is the schematic energy spectrum scanning diagram of the water-blocking heated tobacco substrate of the third embodiment of the present invention;

[0064] Figure 5 It is the schematic energy spectrum scanning diagram of the heated tobacco substrate of the comparative example of the present invention;

[0065] Figure 6 It is the DTG curve diagram of the third embodiment and the comparative example of the present invention. Specific Embodiments

[0066] The following details the detailed features and advantages of the present invention in the specific embodiments. The content is sufficient for any person skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, those skilled in the art can easily understand the related purposes and advantages of the present invention.

[0067] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0068] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0069] To make the purpose, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the drawings.

[0070] Example 1

[0071] First, prepare tobacco sheet filaments by the papermaking method as the tobacco source substrate. Coat the aerosol former glycerol onto the tobacco sheet filaments to form tobacco sheet filaments with a glycerol content of 20%. Prepare a 2% silicon dioxide (SiO2) solution using solvent ethanol as the water-blocking composition. Add 2% of the silicon dioxide solution to the tobacco sheet filaments containing the aerosol former. Use a constant temperature and humidity chamber with air flow to balance the sheet filaments so that the sheet filaments contain 2% silicon dioxide. Balance the sheet filaments at 20% humidity until the sample mass reaches a constant value to obtain the water-blocking heated tobacco matrix, as Figure 1 shown, and measure its initial mass. Place the dried sheet filaments (i.e., the water-blocking heated tobacco matrix) in a 55% humidity environment respectively, record the mass of the sheet filaments after moisture absorption equilibrium, and calculate the moisture absorption amount Q according to formula (1).

[0072]

[0073] In the formula, Q is the equilibrium moisture absorption amount of the sample; M t is the mass of the sample at the equilibrium of moisture absorption time, and M0 is the initial mass.

[0074] Example 2

[0075] First, prepare tobacco sheet filaments by the papermaking method as the tobacco source substrate. Coat the aerosol former glycerol onto the tobacco sheet filaments to form tobacco sheet filaments with a glycerol content of 20%. Prepare a 2% polydimethylsiloxane (PDMS) solution using solvent n-hexane as the water-blocking composition. Add the water-blocking composition to the tobacco sheet filaments with 20% glycerol content (papermaking method) by spraying, and cure at room temperature for 24 hours. Use a constant temperature and humidity chamber with air flow to balance the sheet filaments so that the sheet filaments contain 2% PDMS. Balance the sheet filaments at 20% humidity until the sample mass reaches a constant value to obtain the water-blocking heated tobacco matrix, measure its initial mass; place the dried sheet filaments (i.e., the water-blocking heated tobacco matrix) in a 55% humidity environment respectively, record the mass of the sheet filaments after moisture absorption equilibrium, and calculate the moisture absorption amount Q according to formula (1).

[0076] Example 3

[0077] First, prepare tobacco sheet filaments by the papermaking method as the tobacco source substrate. Coat the aerosol former glycerol onto the tobacco sheet filaments to form tobacco sheet filaments with a glycerol content of 20% by the papermaking method. Prepare a 1% silica (SiO2) dispersion solution with solvent ethanol and add it to the tobacco sheet filaments (by the papermaking method) with a 20% glycerol content by spraying. Then spray n-hexane to prepare a 1% polydimethylsiloxane solution (PDMS) and cure it at room temperature for 24 hours. Adopt the method of turning on the air flow in a constant temperature and humidity chamber to balance the sheet filaments. Among them, silica and PDMS each account for 1% in the sheet filaments, and silica (SiO2) and PDMS act synergistically as a water-blocking composition. Balance the sheet filaments at 20% humidity until the sample mass reaches a constant to obtain a water-blocking heated tobacco matrix, and measure its initial mass; Place the dried sheet filaments (i.e., the water-blocking heated tobacco matrix) in a humidity environment of 55% respectively, record the mass of the sheet filaments after moisture absorption equilibrium, and calculate the moisture absorption Q according to formula (1).

[0078] Example 4

[0079] First, prepare tobacco sheet filaments by the papermaking method as the tobacco source substrate. Disperse the aerosol former glycerol and the biomass film-forming material nanocellulose in 78 parts of ethanol in a weight ratio of 20 parts: 2 parts, and spray it onto the tobacco sheet filaments to form tobacco sheet filaments with a glycerol content of 20% by the papermaking method. Adopt the method of turning on the air flow in a constant temperature and humidity chamber to balance the sheet filaments. Among them, the sheet filaments contain 2% nanocellulose. Balance the sheet filaments at 20% humidity until the sample mass reaches a constant to obtain a water-blocking heated tobacco matrix, and measure its initial mass; Place the dried sheet filaments (i.e., the water-blocking heated tobacco matrix) in a humidity environment of 55% respectively, record the mass of the sheet filaments after moisture absorption equilibrium, and calculate the moisture absorption Q according to formula (1).

[0080] Example 5

[0081] First, prepare tobacco sheet filaments as the tobacco source substrate by the papermaking method. Coat the aerosol former glycerol onto the tobacco sheet filaments to form tobacco sheet filaments with a glycerol content of 20%. Use ethanol as the solvent to prepare a dispersion of silica (SiO2) with a concentration of 0.8% and nanocellulose as the biomass film-forming material with a concentration of 0.2%. Add it to the tobacco sheet filaments (papermaking method) with a 20% glycerol content by spraying. Then spray a 1% polydimethylsiloxane solution (PDMS) in n-hexane and cure at room temperature for 24 hours. Balance the sheet filaments by opening the air flow in a constant temperature and humidity chamber. Among them, the sheet filaments contain 0.8% silica, 0.2% nanocellulose, and 1% PDMS. Silica, nanocellulose, and PDMS act synergistically as a water-blocking composition. Balance the sheet filaments at 20% humidity until the sample mass reaches a constant to obtain a water-blocking heated tobacco substrate, and measure its initial mass. Place the dried sheet filaments (i.e., the water-blocking heated tobacco substrate) in a humidity environment of 55% respectively, record the mass of the sheet filaments after moisture absorption equilibrium, and calculate the moisture absorption amount Q according to formula (1).

[0082] Example 6

[0083] First, directly mix 80 parts of the tobacco source substrate, 20 parts of the aerosol former glycerol, and 2 parts of dextran to make tobacco sheet filaments. Balance the sheet filaments at 20% humidity until the sample mass reaches a constant to obtain a water-blocking heated tobacco substrate, and measure its initial mass. Place the dried sheet filaments (i.e., the water-blocking heated tobacco substrate) in a humidity environment of 55% respectively, record the mass of the sheet filaments after moisture absorption equilibrium, and calculate the moisture absorption amount Q according to formula (1).

[0084] Comparative Example

[0085] The comparative example is a blank sample. Take tobacco sheet filaments (papermaking method) with a 20% glycerol content as the control heated tobacco substrate.

[0086] To further illustrate the advantages of the present invention, analyze the dried sheet filaments obtained in Examples 1 - 6 and the tobacco sheet filaments obtained in the comparative example

[0087] I. Hygroscopicity

[0088] The results of calculating the moisture absorption amount Q of Examples 1 - 6 and the comparative example according to formula (1) are shown in Table 1 as follows:

[0089] Table 1 Moisture absorption rate of the heated tobacco substrate

[0090]

[0091] As can be seen from Table 1, compared with the comparative examples, the six blocking-type water-blocking compositions of SiO2, PDMS, PDMS and SiO2 composition, nanocellulose, PDMS, SiO2 and nanocellulose composition, and dextran in Examples 1 to 6 can significantly reduce the moisture absorption rate of cut tobacco filaments by spraying or directly mixing with tobacco source substrates. Among them, the moisture absorption rates of Examples 2, 3 and 5 are the lowest, that is, the water-blocking effects of PDMS, PDMS and SiO2 composition, PDMS, SiO2 and nanocellulose composition are more significant. Moreover, by comparing the experimental data of Example 3 with those of Examples 1 to 2, it can be seen that adding both organic synthetic film-forming materials and inorganic particles has a better technical effect of reducing hygroscopicity than adding only one of them, that is, it can prove that organic synthetic film-forming materials and inorganic particles have a synergistic effect in reducing the hygroscopicity of aerosol-generating articles.

[0092] II. Apparent Morphology Analysis

[0093] The surface microstructures of the dried cut tobacco filaments obtained in Example 3 and the tobacco leaf lamina filaments obtained in the comparative example were characterized by field emission scanning electron microscopy. The cut tobacco filaments were magnified 5000 times and 20000 times respectively, and the electron microscope scanning images are as Figures 2 - 3 shown. Figure 2 (d) and (f) in Figure 3 are the electron microscope scanning images of the cut tobacco filaments of Example 3 at 5000 times and 20000 times respectively;

[0094] From Figures 2 - 3 it can be seen that there is not much difference in the apparent morphology of the cut tobacco filaments of Example 3 and the comparative example at 5000 times; at 20000 times, there are many small holes on the surface of the cut tobacco filaments in the comparative example, while there are no holes in Example 3, indicating that PDMS was successfully coated on the cut tobacco filaments of Example 3 to form a water-blocking isolation layer.

[0095] III. Energy Spectrum Analysis

[0096] The cut tobacco filaments of Example 3 and the comparative example were respectively subjected to energy spectrum scanning analysis, and the results are shown in Tables 2 to 3 and Figures 4 - 5 shown.

[0097] Table 2 Energy Spectrum Scanning of Cut Tobacco Filaments of Example 3

[0098] element weight percentage % atomic % net intensity % error % C K 13.83 31.36 71.71 9.90 N K 2.64 5.13 9.68 21.45 O K 27.51 46.83 189.52 9.35 Si K 4.57 4.43 51.38 7.09 Pt M 42.19 5.89 137.39 6.12 K K 4.40 3.06 18.23 15.52 Ca k 4.86 3.30 15.86 17.22

[0099] Table 3 Energy Spectrum Scanning of Cut Tobacco Filaments of the Comparative Example

[0100]

[0101]

[0102] From Figures 4 - 5 As can be seen from Table 2 to Table 3, there is no silicon element on the surface of the comparative example, and there is silicon element on the surface of Example 3, indicating that PDMS is successfully coated on the surface of the thin filament. The coverage of the water-blocking composition thus forms a water-blocking isolation layer on the surface of the thin filament, achieving the effect of reducing moisture absorption.

[0103] IV. Thermogravimetric Analysis

[0104] The thin filaments of Example 3 and the comparative example were subjected to thermogravimetric analysis, as Figure 6 shown.

[0105] From the derivative thermogravimetric curve, that is, Figure 6 from the DTG curve graph, it can be seen that there is a peak in Example 3 at about 400 °C, while there is no peak in the comparative example, indicating that this peak is the peak generated by the decomposition of PDMS. Therefore, the starting decomposition temperature of PDMS is above 350 °C, ensuring the stability of the water-blocking isolation layer during conventional processing and storage.

[0106] The terms and expressions used herein are for descriptive purposes only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean excluding any equivalent features of the illustration and description (or parts thereof). It should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be regarded as covering all such equivalents.

[0107] Similarly, it should be noted that although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications of the above embodiments are within the scope of the spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. A water-blocking heated tobacco substrate, the heated tobacco substrate comprising a tobacco source base material, an aerosol former, and a water-blocking isolation layer, the heated tobacco substrate being capable of releasing an aerosol containing the aerosol former after being heated, characterized in that, The water-blocking isolation layer is formed by spraying a water-blocking composition on the surface of the tobacco source substrate or formed inside the tobacco source substrate after mixing the water-blocking composition with the tobacco source substrate. The water-blocking composition includes: Film-forming agent: 10 parts Reinforcing filler: 0 - 10 parts Biomass film-forming material: 0 - 10 parts.

2. The water-blocking heated tobacco substrate according to claim 1, wherein, The form of the heated tobacco substrate includes one or a combination of powders, granules, pellets, flakes, strips, bands or sheets. The reinforcing filler is 1 - 10 parts, the biomass film-forming material is 1 - 10 parts. The film-forming agent includes an organic synthetic film-forming material, and the reinforcing filler is an inorganic particle.

3. The water-blocking heated tobacco substrate according to claim 2, characterized in that, The organic synthetic film-forming material includes polysiloxane and / or fluororesin. The polysiloxane includes polydimethylsiloxane or polyether-modified polysiloxane. The fluororesin includes perfluoroalkyl graft-modified polyethylene glycol, perfluoroalkyl graft-modified polyvinyl alcohol or perfluoroalkyl graft-modified degradable material. The biomass film-forming material includes one or a combination of dextran, cellulose, nanofibrillated cellulose, microcrystalline cellulose or lignin. The inorganic particles include one or a combination of silicon dioxide, alumina, activated carbon or calcium carbonate.

4. The water-blocking heated tobacco substrate according to claim 2, wherein, The water-blocking composition is dissolved in a solvent. The solvent includes one or a combination of alcohol solvents, ester solvents, ketone solvents or hydrocarbon solvents. The hydrocarbon solvent includes n-hexane. The concentration of the water-blocking composition is 0.1 - 50 wt%.

5. The water-blocking heated tobacco substrate according to claim 1, characterized in that, The aerosol former is a polyol, which is an organic alcohol containing two or more hydroxyl groups with a functionality of 2 - 8. Among them, the number-average molecular weight of the organic alcohol is below 500.

6. The water-blocking heated tobacco substrate according to claim 5, characterized in that, The aerosol former includes one or a combination of glycerol and propylene glycol. The aerosol former accounts for 5 - 35 wt% of the total amount of the water-blocking heated tobacco substrate.

7. The water-blocking heated tobacco substrate according to claim 5, wherein, The mass ratio of the tobacco source substrate to the aerosol former is 95:5 - 60:

40.

8. The water-blocking heated tobacco substrate according to any one of claims 1 to 7, characterized in that The water-blocking isolation layer is formed under the condition of an environmental temperature of 15 - 100 °C for 1 - 72 hours.

9. A heated cigarette, which comprises the water-blocking heated tobacco substrate according to any one of claims 1 - 8.

10. The heated cigarette according to claim 9, characterized in that, The water-blocking isolation layer is formed on the surface of the heated tobacco substrate.

11. A heated cigarette, comprising a mouthpiece element and a cooling element, characterized in that, The water-blocking composition can be applied to any component of the heated cigarette. The water-blocking composition includes: Film-forming agent: 10 parts Reinforcing filler: 0 - 10 parts Biomass film-forming material: 0 - 10 parts.

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