Doped modified tobacco sheet and its preparation method and application

Abstract

The application provides a doped modified tobacco sheet and a preparation method and application thereof, and the preparation method comprises the following steps: (1) Ti3AlC2 is subjected to one-step etching treatment, mixed with ammonium oleate and a solvent to obtain an ammonium oleate modified layered titanium carbide dispersion liquid; (2) the ammonium oleate modified layered titanium carbide dispersion liquid is mixed with an oil acid coated Fe3O4 nanocrystal dispersion liquid, the solvent is removed, and after annealing treatment, a modified material is obtained through two-step etching treatment; (3) the modified material, tobacco raw materials, a binder and a solvent are mixed, and after post-treatment, the doped modified tobacco sheet is obtained. The two-dimensional / mesoporous carbon skeleton superlattice modified material is added in the tobacco sheet, the heat and mass transfer performance of the tobacco sheet can be enhanced, on one hand, the cigarette combustion performance is improved, on the other hand, the release amount of essence and spices added in the coating liquid is increased, the smoke fullness and flavor components are increased, the smoking quality is improved, and the taste is improved.

Description

Technical Field

[0001] This invention belongs to the field of tobacco product technology, and relates to a doped and modified tobacco sheet, its preparation method and application. Background Technology

[0002] Tobacco sheets, as an important component of cigarette formulation, have a good effect on reducing tar and harm, and the stability of their quality indicators is increasingly valued by cigarette manufacturing companies. Because the raw materials for tobacco sheets are tobacco stems and broken tobacco leaves, these materials differ from woody plant fibers, containing less fiber and more parenchyma cells and other cells.

[0003] CN118266611A discloses a tobacco sheet with multiple aromas, comprising a tobacco sheet substrate, a conventional coating layer on at least one surface of the tobacco sheet substrate, a multi-aroma flavoring layer disposed between the tobacco sheet substrate and the conventional coating layer, and multi-aroma flavoring doped into the conventional coating layer.

[0004] CN105901761A discloses a tobacco sheet containing mangosteen husks, which is made from the following raw materials in parts by weight: tobacco dust 40-60, tobacco stems 20-30, mangosteen husks 5-10, mangosteen juice 3-5, ginger juice 3-5, octenyl succinic anhydride 0.5-1, xanthan gum 0.05-0.1, calcium carbonate 5-10, tetrabutyl titanate 2-4, glycerol 1-2, and sodium gluconate 0.5-1.

[0005] To ensure sufficient combustibility and aroma in cigarette production, the aforementioned methods all employ the addition of flavorings or additives to enhance the combustibility and aroma of the tobacco. However, this method of adding flavorings results in a high aroma content in the initial smoke, but in the later stages of smoking, the flavorings have already volatilized at the initial smoke temperature, leading to a significant decrease in aroma content and a poor sensory experience. Furthermore, the additives used have poor stability and undergo denaturation during smoking, resulting in a noticeable reduction in the smoking experience in the later stages. Summary of the Invention

[0006] The purpose of this invention is to provide a doped and modified tobacco sheet, its preparation method, and its application. This invention adds a two-dimensional / mesoporous carbon framework multilayer superlattice modifying material to the tobacco sheet, which can enhance the heat and mass transfer properties of the tobacco sheet. This improves the combustion performance of cigarettes and increases the release of flavorings and fragrances added to the coating liquid, thereby increasing the fullness of the smoke and aroma components, improving smoking quality, and enhancing the taste. To achieve this objective, the invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for preparing doped and modified tobacco sheets, the method comprising the following steps:

[0008] (1) Ti3AlC2 was etched in one step and then mixed with ammonium oleate and solvent to obtain an ammonium oleate modified layered titanium carbide dispersion.

[0009] (2) The ammonium-modified layered titanium carbide dispersion was mixed with the oleic acid-coated Fe3O4 nanocrystal dispersion, the solvent was removed, and after annealing, the modified material was obtained by two-step etching.

[0010] (3) The modified material, tobacco raw material, adhesive and solvent are mixed and post-processed to obtain the doped modified tobacco sheet.

[0011] This invention prepares layered titanium carbide (the layered titanium carbide is a two-dimensional ultrathin material with the chemical formula Ti3C2T). x It possesses many excellent physical and chemical properties. It is a type of titanium carbide, in which "T" x "Representing its surface functional groups (which can be hydroxyl, carboxyl, or other functional groups), after surface modification, the two-dimensional nanosheets of layered titanium carbide can be stably mixed with colloidal nanocrystals (oleic acid-coated Fe3O4 nanocrystals) with long-chain ligand-terminated structures in a nonpolar solvent. Slow evaporation of the solvent at the gas-liquid interface induces co-assembly of the two, forming a two-dimensional / zero-dimensional cascaded heterostructure. A two-dimensional / zero-dimensional cascaded superlattice can be obtained. After carbonization and etching away the nanocrystals, a two-dimensional / mesoporous carbon framework cascaded superlattice can be obtained, i.e., a modified material." Adding a two-dimensional / mesoporous carbon framework multilayer superlattice to tobacco sheets can improve the structure of the tobacco sheets, enhancing their structural stability, air permeability, oxygen storage capacity, and combustibility. The modified material has a layered structure with mesoporous carbon between the layers. This unique structure significantly enhances the heat and mass transfer properties of the tobacco sheets, improving both cigarette combustion performance and the release of flavorings and fragrances added to the coating liquid, increasing smoke fullness and aroma components, thus improving smoking quality and taste.

[0012] Preferably, the etchant used in step (1) includes hydrofluoric acid and / or hydrochloric acid.

[0013] Preferably, after the etching process described in step (1), centrifugation and washing are performed.

[0014] Preferably, the solvent in step (1) includes deionized water.

[0015] Preferably, the mixture in step (1) is subjected to extraction.

[0016] Preferably, the extractant used in the extraction process includes chloroform.

[0017] Preferably, the mass concentration of the ammonium oleate-modified layered titanium carbide dispersion in step (2) is 1 to 10 g / L, for example: 1 g / L, 2 g / L, 5 g / L, 8 g / L or 10 g / L, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0018] Preferably, the mass concentration of the oleic acid-coated Fe3O4 nanocrystal dispersion in step (2) is 5 to 15 g / L, for example: 5 g / L, 8 g / L, 10 g / L, 12 g / L or 15 g / L, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0019] Preferably, the mass ratio of the solute in the ammonium oleate-modified layered titanium carbide dispersion to the solute in the oleic acid-coated Fe3O4 nanocrystal dispersion in step (2) is 1:(0.6~1), for example: 1:0.6, 1:0.7, 1:0.8, 1:0.9 or 1:1, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0020] Preferably, the oleic acid-coated Fe3O4 nanocrystal dispersion described in step (2) is prepared by the following method:

[0021] Iron oleate, oleic acid, and a first solvent are mixed and subjected to pyrolysis to obtain oleic acid-coated Fe3O4 nanoparticles. The oleic acid-coated Fe3O4 nanoparticles are then mixed with a second solvent to obtain an oleic acid-coated Fe3O4 nanocrystal dispersion.

[0022] Preferably, the first solvent comprises octadecene.

[0023] Preferably, the molar ratio of ferric oleate to oleic acid is 1:(0.6 to 0.9), for example: 1:0.6, 1:0.68, 1:0.7, 1:0.8 or 1:0.9, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0024] Preferably, the temperature of the pyrolysis treatment is 300-350℃, for example: 300℃, 310℃, 320℃, 340℃ or 350℃, etc.

[0025] Preferably, the pyrolysis treatment time is 20 to 40 minutes, for example: 20 minutes, 25 minutes, 30 minutes, 35 minutes or 40 minutes, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0026] Preferably, the second solvent comprises n-hexane.

[0027] Preferably, the solvent removal method in step (2) includes evaporation.

[0028] Preferably, the annealing temperature in step (2) is 350 to 450°C, for example: 350°C, 380°C, 400°C, 420°C or 450°C, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0029] Preferably, the annealing time in step (2) is 1 to 3 hours, for example: 1 hour, 1.5 hours, 2 hours, 2.5 hours or 3 hours, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0030] Preferably, the etchant used in the two-step etching process of step (2) includes hydrochloric acid.

[0031] Preferably, after the two-step etching process described in step (2), the process involves centrifugation, washing, and drying.

[0032] Preferably, the mass ratio of the modified material, tobacco raw material and adhesive in step (3) is (2-8):100:(3-5), for example: 2:100:3, 5:100:3, 6:100:5, 4:100:4 or 8:100:5, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0033] Preferably, an atomizing agent is also added to the mixture in step (3).

[0034] Preferably, the atomizing agent comprises 1,3-butanediol and / or propylene glycol.

[0035] Preferably, the mass ratio of the atomizing agent to the tobacco raw material is (5-10):100, for example: 5:100, 6:100, 8:100, 9:100 or 10:100, etc., and is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0036] In a second aspect, the present invention provides a doped and modified tobacco sheet, which is prepared by the method described in the first aspect.

[0037] Thirdly, the present invention provides a tobacco article comprising doped and modified tobacco sheets as described in the second aspect.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] This invention adds a two-dimensional / mesoporous carbon skeleton multilayer superlattice modified material to tobacco sheets, which can enhance the heat and mass transfer performance of tobacco sheets. On the one hand, it improves the combustion performance of cigarettes, and on the other hand, it increases the release of flavorings and fragrances added to the coating liquid, increases the fullness of smoke and aroma components, improves smoking quality, and improves taste. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the preparation process of the modified material described in Embodiment 1 of the present invention.

[0041] Among them, 1 is Fe3O4 nanocrystals coated with oleic acid, 2 is layered titanium carbide modified with ammonium oleate, 3 is a two-dimensional / zero-dimensional stacked heterostructure, 4 is a two-dimensional / zero-dimensional stacked superlattice, 5 is a two-dimensional / mesoporous carbon framework stacked superlattice (modified material), a is volatile solvent, b is annealing, and c is etching. Detailed Implementation

[0042] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0043] Example 1

[0044] This embodiment provides a doped and modified tobacco sheet, and the preparation method of the doped and modified tobacco sheet is as follows:

[0045] (1) Take 1g of Ti3AlC2 and slowly add it to 20mL of etching solution. The etching solution consists of 2mL of 50% HF, 12mL of concentrated hydrochloric acid, and 6mL of deionized water. Stir at 25℃ for 24h. Then, wash the reaction solution with deionized water to a pH of approximately 6-7 by repeated centrifugation (6500rpm, 5min). Add 10mL of 25% tetramethylammonium hydroxide (TMAOH) aqueous solution and stir at room temperature for 12h to perform TMA etching. + Ion intercalation. Then, excess TMAOH was removed by centrifugation (6500 rpm, 5 min), followed by centrifugation (3500 rpm, 1 h) to obtain layered titanium carbide nanosheets. The layered titanium carbide nanosheets were mixed with deionized water, and excess ammonium oleate was added and stirred for 2 h. Then, chloroform was used for extraction to obtain an ammonium oleate-modified layered titanium carbide dispersion.

[0046] (2) Iron oleate and oleic acid were dissolved in 400g of octadecene at a molar ratio of 1:0.75. The mixture was pyrolyzed at 320℃ for 30min and then rapidly cooled. After cooling to room temperature, the resulting mixture was washed with ethanol, isopropanol, and n-hexane, centrifuged, and the resulting solid was mixed with n-hexane to obtain an oleic acid-coated Fe3O4 nanocrystal dispersion. 10mL of ammonium oleate-modified layered titanium carbide dispersion (5g / L) was mixed with 5mL of oleic acid-coated Fe3O4 nanocrystal dispersion (8g / L) and sonicated for 3min to form a two-dimensional / zero-dimensional cascaded heterostructure. The mixture was then slowly evaporated in a covered ceramic boat and annealed at 400℃ under Ar for 2h to obtain a two-dimensional / zero-dimensional cascaded superlattice. It was then etched with 3mol / L hydrochloric acid, washed, and dried to obtain a two-dimensional / mesoporous carbon framework cascaded superlattice modified material. The preparation process of the modified material is shown in the schematic diagram below. Figure 1 As shown;

[0047] (3) Mix 5g of modified material, 100g of tobacco raw material, 4g of binder, 2g of 1,3-butanediol, 3g of propylene glycol and 300g of water, and after stirring, pressing and drying, obtain the doped and modified tobacco sheet.

[0048] Example 2

[0049] This embodiment provides a doped and modified tobacco sheet, and the preparation method of the doped and modified tobacco sheet is as follows:

[0050] (1) Take 1g of Ti3AlC2 and slowly add it to 20mL of etching solution. The etching solution consists of 2mL of 50% HF, 12mL of concentrated hydrochloric acid, and 6mL of deionized water. Stir at 25℃ for 24h. Then, wash the reaction solution with deionized water to a pH of approximately 6-7 by repeated centrifugation (6500rpm, 5min). Add 10mL of 25% tetramethylammonium hydroxide (TMAOH) aqueous solution and stir at room temperature for 12h to perform TMA etching. + Ion intercalation. Then, excess TMAOH was removed by centrifugation (6500 rpm, 5 min), followed by centrifugation (3500 rpm, 1 h) to obtain layered titanium carbide nanosheets. The layered titanium carbide nanosheets were mixed with deionized water, and excess ammonium oleate was added and stirred for 2 h. Then, chloroform was used for extraction to obtain an ammonium oleate-modified layered titanium carbide dispersion.

[0051] (2) Iron oleate and oleic acid were dissolved in 400g of octadecene at a molar ratio of 1:0.75. The mixture was pyrolyzed at 300℃ for 40min and then rapidly cooled. After cooling to room temperature, the resulting mixture was washed with ethanol, isopropanol and n-hexane, centrifuged, and the resulting solid was mixed with n-hexane to obtain an oleic acid-coated Fe3O4 nanocrystal dispersion. 10mL of ammonium oleate-modified layered titanium carbide dispersion (1g / L) was mixed with 1mL of oleic acid-coated Fe3O4 nanocrystal dispersion (6g / L) and sonicated for 5min to form a two-dimensional / zero-dimensional tandem heterostructure. The mixture was then slowly evaporated in a covered ceramic boat and annealed at 350℃ Ar for 3h to obtain a two-dimensional / zero-dimensional tandem superlattice. It was then etched with 3mol / L hydrochloric acid, washed and dried to obtain a two-dimensional / mesoporous carbon framework tandem superlattice modified material.

[0052] (3) Mix 2g of modified material, 100g of tobacco raw material, 3g of binder, 3g of 1,3-butanediol, 5g of propylene glycol and 300g of water, and after stirring, pressing and drying, obtain the doped and modified tobacco sheet.

[0053] Example 3

[0054] This embodiment provides a doped and modified tobacco sheet, and the preparation method of the doped and modified tobacco sheet is as follows:

[0055] (1) Take 1g of Ti3AlC2 and slowly add it to 20mL of etching solution. The etching solution consists of 2mL of 50% HF, 12mL of concentrated hydrochloric acid, and 6mL of deionized water. Stir at 25℃ for 24h. Then, wash the reaction solution with deionized water to a pH of approximately 6-7 by repeated centrifugation (6500rpm, 5min). Add 10mL of 25% tetramethylammonium hydroxide (TMAOH) aqueous solution and stir at room temperature for 12h to perform TMA etching. + Ion intercalation. Then, excess TMAOH was removed by centrifugation (6500 rpm, 5 min), followed by centrifugation (3500 rpm, 1 h) to obtain layered titanium carbide nanosheets. The layered titanium carbide nanosheets were mixed with deionized water, and excess ammonium oleate was added and stirred for 2 h. Then, chloroform was used for extraction to obtain an ammonium oleate-modified layered titanium carbide dispersion.

[0056] (2) Iron oleate and oleic acid were dissolved in 400g of octadecene at a molar ratio of 1:0.9. The mixture was pyrolyzed at 350℃ for 30min and then rapidly cooled. After cooling to room temperature, the resulting mixture was washed with ethanol, isopropanol and n-hexane, centrifuged, and the resulting solid was mixed with n-hexane to obtain an oleic acid-coated Fe3O4 nanocrystal dispersion. 1mL of ammonium oleate-modified layered titanium carbide dispersion (10g / L) was mixed with 1mL of oleic acid-coated Fe3O4 nanocrystal dispersion (10g / L) and sonicated for 5min to form a two-dimensional / zero-dimensional tandem heterostructure. The mixture was then slowly evaporated in a covered ceramic boat and annealed at 450℃ under Ar for 1h to obtain a two-dimensional / zero-dimensional tandem superlattice. It was then etched with 3mol / L hydrochloric acid, washed and dried to obtain a two-dimensional / mesoporous carbon framework tandem superlattice modified material.

[0057] (3) Mix 8g of modified material, 100g of tobacco raw material, 5g of binder, 4g of 1,3-butanediol, 6g of propylene glycol and 300g of water, and after stirring, pressing and drying, obtain the doped and modified tobacco sheet.

[0058] Example 4

[0059] The only difference between this embodiment and Example 1 is that the volume of the oleic acid-coated Fe3O4 nanocrystal dispersion is 2.5 mL, while the other conditions and parameters are exactly the same as in Example 1.

[0060] Example 5

[0061] The only difference between this embodiment and Example 1 is that the volume of the oleic acid-coated Fe3O4 nanocrystal dispersion is 7.5 mL, while the other conditions and parameters are exactly the same as in Example 1.

[0062] Example 6

[0063] The only difference between this embodiment and Embodiment 1 is that the mass of the modified material is 1g, while the other conditions and parameters are exactly the same as in Embodiment 1.

[0064] Example 7

[0065] The only difference between this embodiment and Embodiment 1 is that the mass of the modified material is 10g, while the other conditions and parameters are exactly the same as in Embodiment 1.

[0066] Comparative Example 1

[0067] The only difference between this comparative example and Example 1 is that ammonium oleate is not used to modify the layered titanium carbide nanosheets; all other conditions and parameters are exactly the same as in Example 1.

[0068] Comparative Example 2

[0069] The only difference between this comparative example and Example 1 is that oleic acid-coated Fe3O4 nanocrystal dispersion is not added; all other conditions and parameters are exactly the same as in Example 1.

[0070] Comparative Example 3

[0071] The only difference between this comparative example and Example 1 is that oleic acid-coated Fe3O4 nanocrystal dispersion was directly carbonized and then etched to form mesoporous carbon as a modified material. All other conditions and parameters are exactly the same as in Example 1.

[0072] Performance testing:

[0073] Aspiration tests were conducted on the examples, comparative examples, and blank samples. The test results are as follows:

[0074] Blank sample: The amount of smoke is small, the aroma is faint, and there is aroma on the first two puffs, but almost no aroma on the subsequent puffs.

[0075] Examples 1-3: Sufficient smoke, significantly increased aroma, full aroma, suitable strength, harmonious inhalation, no irritation, and comfortable aftertaste.

[0076] Examples 4-5: The amount of smoke and aroma were slightly increased, the inhalation was relatively smooth, and the aftertaste was relatively pleasant, but the overall aroma enhancement effect was not very obvious.

[0077] Examples 6-7: The aroma of the tobacco is enhanced, but the penetration is poor, the strength is slightly strong, and it is slightly irritating, but the aftertaste is still comfortable.

[0078] Comparative Example 1: Small amount of smoke, weak aroma, uncoordinated inhalation, and strong irritation.

[0079] Comparative Example 2: Slightly increased smoke volume and aroma, but the inhalation was uncoordinated and more irritating.

[0080] Comparative Example 3: Sufficient smoke volume, light aroma, smooth inhalation, and strong irritation.

[0081] A comparison of Examples 1 and 4-5 shows that, in the preparation process of the doped and modified tobacco sheet described in this invention, the ratio of ammonium oleate-modified layered titanium carbide to oleic acid-coated Fe3O4 nanocrystals affects its performance. Controlling the mass ratio of ammonium oleate-modified layered titanium carbide to oleic acid-coated Fe3O4 nanocrystals to 1:0.6-1 yields better doped and modified tobacco sheet results. If the amount of ammonium oleate-modified oleic acid-coated Fe3O4 nanocrystals added is too low, the filling amount of porous carbon material between the layers of the modified titanium carbide is low, resulting in poor improvement. If the amount of ammonium oleate-modified oleic acid-coated Fe3O4 nanocrystals added is too high, excessive porous carbon material adheres to the surface of the layered titanium carbide, leading to reduced stability of the layered structure and a tendency to collapse.

[0082] A comparison of Examples 1 and 6-7 shows that the mass ratio of the modified material to the tobacco raw material affects the performance of the tobacco sheet prepared according to the present invention. Controlling the mass ratio of the modified material to the tobacco raw material to 2-8:100 yields better results in preparing the modified tobacco sheet. If the amount of modified material added is too low, the modification effect is not obvious. If the amount of modified material added is too high, excessive smoke and nicotine will be produced during smoking, resulting in a decreased user experience.

[0083] As can be seen from the comparison between Example 1 and Comparative Example 1, without modification of layered titanium carbide, the two-dimensional nanosheets of layered titanium carbide cannot self-assemble with colloidal nanocrystals capped with long-chain ligands, resulting in the inability to form two-dimensional / zero-dimensional stacked heterojunctions. Consequently, the modified material of this application cannot be obtained, and only a simple mixture is produced, with a significant decrease in modification effect.

[0084] As can be seen from the comparison between Example 1 and Comparative Examples 2-3, using only simple layered titanium carbide or mesoporous carbon materials as modifying materials cannot achieve a synergistic modification effect, and the effect of producing tobacco sheets is not obvious.

[0085] In summary, the tobacco sheets prepared in Examples 1-3 of this invention can significantly increase the amount of smoke, produce a smooth smoke, enhance the aroma, mask off impurities, and have a rich and delicate aroma, suitable strength, comfortable aftertaste, good overall smoking coordination, and a strong sense of pleasure.

[0086] A detailed analysis of the lysis products of Example 1 and the blank sample was performed. " / " indicates that the products were not detected. The analysis results are shown in Table 1.

[0087] Table 1

[0088]

[0089]

[0090]

[0091] As can be seen from Table 1, using the modified tobacco sheet described in this invention significantly increases the aroma components, enriches the smoke aroma, and improves the smoking quality.

[0092] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing doped and modified tobacco sheets, characterized in that, The preparation method includes the following steps: (1) Ti3AlC2 was etched in one step and then mixed with ammonium oleate and solvent to obtain an ammonium oleate-modified layered titanium carbide dispersion; (2) The layered titanium carbide dispersion modified with ammonium oleate was mixed with the Fe3O4 nanocrystal dispersion coated with oleic acid, the solvent was removed, and after annealing, the modified material was obtained by two-step etching. (3) The modified material, tobacco raw material, binder and solvent are mixed and post-processed to obtain the doped modified tobacco sheet; The etching agent for the one-step etching process in step (1) includes hydrofluoric acid and / or hydrochloric acid; In step (2), the mass ratio of the solute in the ammonium oleate-modified layered titanium carbide dispersion to the solute in the oleic acid-coated Fe3O4 nanocrystal dispersion is 1:(0.6~1). The annealing temperature in step (2) is 350~450℃, and the annealing time is 1~3h. The etchant in the two-step etching process in step (2) includes hydrochloric acid.

2. The preparation method according to claim 1, characterized in that, After the etching process described in step (1), centrifugation and washing are performed.

3. The preparation method according to claim 1, characterized in that, The solvent in step (1) includes deionized water.

4. The preparation method according to claim 1, characterized in that, The mixture in step (1) is then subjected to extraction.

5. The preparation method according to claim 4, characterized in that, The extractant used in the extraction process includes chloroform.

6. The preparation method according to claim 1, characterized in that, The mass concentration of the ammonium oleate-modified layered titanium carbide dispersion in step (2) is 1~10 g / L.

7. The preparation method according to claim 1, characterized in that, The mass concentration of the oleic acid-coated Fe3O4 nanocrystal dispersion in step (2) is 5~15 g / L.

8. The preparation method according to claim 1, characterized in that, The oleic acid-coated Fe3O4 nanocrystal dispersion in step (2) was prepared by the following method: Iron oleate, oleic acid, and a first solvent are mixed and subjected to pyrolysis to obtain oleic acid-coated Fe3O4 nanoparticles. The oleic acid-coated Fe3O4 nanoparticles are then mixed with a second solvent to obtain an oleic acid-coated Fe3O4 nanocrystal dispersion.

9. The preparation method according to claim 8, characterized in that, The first solvent includes octadecene.

10. The preparation method according to claim 8, characterized in that, The molar ratio of ferric oleate to oleic acid is 1:(0.6~0.9).

11. The preparation method according to claim 8, characterized in that, The pyrolysis treatment temperature is 300~350℃.

12. The preparation method according to claim 8, characterized in that, The pyrolysis treatment time is 20~40 minutes.

13. The preparation method according to claim 8, characterized in that, The second solvent includes n-hexane.

14. The preparation method according to claim 1, characterized in that, The solvent removal method described in step (2) includes evaporation.

15. The preparation method according to claim 1, characterized in that, After the two-step etching process described in step (2), the process involves centrifugation, washing, and drying.

16. The preparation method according to claim 1, characterized in that, The mass ratio of the modified material, tobacco raw material and adhesive in step (3) is (2~8):100:(3~5).

17. The preparation method according to claim 1, characterized in that, In step (3), an atomizing agent is also added to the mixture.

18. The preparation method according to claim 17, characterized in that, The atomizing agent includes 1,3-butanediol and / or propylene glycol.

19. The preparation method according to claim 17, characterized in that, The mass ratio of the atomizing agent to the tobacco raw material is (5~10):

100.

20. A doped and modified tobacco sheet, characterized in that, The doped and modified tobacco sheet is prepared by the method described in any one of claims 1-19.

21. A tobacco product, characterized in that, The tobacco product comprises the doped and modified tobacco sheet as described in claim 20.

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