High-thermal-conductivity combustion carrier based on microstructure as well as preparation method and application of high-thermal-conductivity combustion carrier

Abstract

The invention relates to a microstructure-based high-thermal-conductivity combustion carrier and a preparation method and application thereof, the combustion carrier is a strip-shaped unit, and the combustion carrier comprises a thermal conductive filler, a polymer and an auxiliary agent. The high-thermal-conductivity combustion carrier can effectively conduct heat released by fuel and reduce heat loss, a directional heat flow generation system is constructed based on the high-thermal-conductivity combustion carrier, when the heat flow generation system is ignited and smoked, heat released by combustion of the heat flow generation system flows in a directional mode, and a heat source can be provided for heating cigarette core material heat release.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cigarette technology, in particular to a high-thermal-conductivity combustion carrier based on microstructure and a preparation method and application thereof. BACKGROUND

[0002] Heat-not-burn cigarette is a new type of tobacco product, which is similar to traditional cigarettes in appearance, cigarette structure, function and traditional cigarettes. Different from traditional cigarettes, heat-not-burn cigarette mainly generates smoke by heating tobacco through a heat source, and generates smoke for consumers to inhale in a non-burning state (<400℃), which reduces harmful smoke components generated by high-temperature combustion and thermal cracking of tobacco raw materials, and does not produce sidestream smoke, thereby alleviating the problem of smoking being harmful to health to some extent.

[0003] At present, heat-not-burn cigarettes are divided into two types, ordered heat-not-burn cigarettes and disordered heat-not-burn cigarettes, according to the filling mode of the core material. For ordered heat-not-burn cigarettes, the core material (sheet silk) is arranged in order, and the relatively low porosity will affect the heating efficiency of the cigarette by the heating device. From the perspective of the inner core needle type heating device, heat is more concentrated around the heating needle and less diffused outward. On the other hand, when the ordered heat-not-burn cigarette is inserted into the inner core needle type heating device, the sheet silk may also be pushed out of the smoking segment by the heating needle, which may seriously block the air flow channel and affect the heating efficiency. For disordered heat-not-burn cigarettes, the core material (sheet silk or tobacco silk) is arranged in disorder. Although the disordered heat-not-burn cigarette has a higher porosity and more uniform heat distribution, the filling uniformity of the disordered sheet silk is difficult to control during rolling, and the end of the cigarette may also fall off the silk, which affects the smoking experience.

[0004] Due to the characteristics of heat-not-burn cigarettes releasing aerosol by heating, efficient heat transfer is required, and the heating device as a heat source is inconvenient to carry and operate. If the heat of the burning material can be effectively transferred to the heat-not-burn cigarette, the core material of the heat-not-burn cigarette can release aerosol by heating, which will greatly improve the user experience. Therefore, there is an urgent need for a heat-not-burn cigarette containing an efficient heat flow generation system. SUMMARY

[0005] To solve the above technical problems, the present application provides a high-thermal-conductivity combustion carrier based on microstructure and a preparation method and application thereof. The combustion carrier is a strip unit, and when multiple units are combined, a controllable gap arrangement configuration of non-tight contact is formed, so that a high-efficiency directional heat flow field is formed inside the coating layer during combustion.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a high-thermal-conductivity combustion carrier based on microstructure, which comprises a polymer, a thermal conductive filler and an auxiliary agent. The combustion carrier is a strip unit.

[0008] In the present application, the combustion carrier is in the shape of a strip, which can reduce the contact area between the combustion carriers and between the combustion carriers and the fuel, and can reduce the heat flow resistance effect, maintain the axial continuous heat conduction path, and be conducive to forming a high-efficiency directional heat flow field and improving the heat transfer efficiency.

[0009] In the present application, the combustion carrier comprises a polymer, a heat-conducting filler, and an additive, wherein the polymer serves as a bonding material to fix the combustion carrier to form a strip unit; the heat-conducting filler improves the heat-conducting performance of the combustion carrier; and the additive improves the combustion performance of the combustion carrier. The combination of the three can make the combustion carrier have both good heat-conducting performance and certain combustion performance.

[0010] Preferably, the mass ratio of the polymer, the heat-conducting filler, and the additive is 1:(0.2-0.5):(1-2). The (0.2-0.5) can be, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5, etc. The (1-2) can be, for example, 1, 1.2, 1.4, 1.6, 1.8, or 2, etc.

[0011] Preferably, the polymer contains polyamide and / or dipropylene glycol dibenzoate.

[0012] Preferably, the polymer contains polyamide and dipropylene glycol dibenzoate.

[0013] Preferably, the mass ratio of the polyamide and the dipropylene glycol dibenzoate is 1:(0.2-0.5). The (0.2-0.5) can be, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5, etc.

[0014] Preferably, the heat-conducting filler comprises any one or a combination of at least two of metal nitride, metal oxide, or graphite.

[0015] Preferably, the metal nitride comprises aluminum nitride and / or boron nitride.

[0016] Preferably, the metal oxide comprises copper oxide, aluminum oxide, zinc oxide, and / or manganese oxide.

[0017] Preferably, the additive comprises plant fiber and / or starch.

[0018] Preferably, the shape of the strip unit comprises any one of a cylinder, a cuboid, a spiral, or an outer groove.

[0019] In a second aspect, the present application provides a preparation method of the microstructure-based high-heat-conducting combustion carrier according to the first aspect, which comprises mixing a polymer, a heat-conducting filler, and an additive, heating, and then extruding into a mold.

[0020] Preferably, the heating temperature is 110℃-250℃. For example, it can be 110℃, 130℃, 150℃, 200℃ or 250℃, etc.

[0021] Thirdly, the present invention provides a microstructure-based directional heat flow generation system, the directional heat flow generation system comprising strip-shaped fuel, coating material, and the microstructure-based high thermal conductivity combustion carrier described in the first aspect.

[0022] In this invention, the strip-shaped fuel, the coating material, and the high thermal conductivity combustion carrier in the directional heat flow generation system are all present. The high thermal conductivity combustion carrier is a strip-shaped unit that forms a controllable gap arrangement with the strip-shaped fuel in a non-close contact configuration. This arrangement configuration has the following synergistic effects: (1) reducing the heat flow barrier effect by reducing the actual contact area of ​​adjacent strip-shaped units; (2) maintaining a continuous axial heat conduction path; and (3) optimizing the synergistic effect of heat conduction and airflow dynamics. As a heated cigarette core material, the heat flow generation system of this invention can improve the heat transfer efficiency of the heating element of the electric heated cigarette device. The heat flow generation system can also be used as fuel installed at the front end of the heated cigarette core material. After ignition and inhalation, a high-temperature hot airflow is generated. Through the synergistic optimization of the surface morphology and spatial distribution of the strip-shaped units, an axially dominant heat flow transmission characteristic is established at the combustion interface, so that the combustion wavefront advances stably along the axial direction. Combined with the heat insulation characteristics of the coating layer and the high thermal conductivity characteristics of the combustion carrier, an efficient directional heat flow field is formed inside the coating layer during combustion, providing an effective heat source for the release of aerosols from the heated cigarette core material at the rear end.

[0023] Preferably, the strip-shaped fuel and the high thermal conductivity combustion carrier are wrapped with a coating material and arranged along their length.

[0024] Preferably, the packing density of the strip-shaped fuel and the high thermal conductivity combustion carrier in the directional heat flow generation system is 150 mg / cm³. 3 -750 mg / cm 3 For example, it could be 150 mg / cm³. 3 200 mg / cm 3 250 mg / cm 3 300 mg / cm 3 350 mg / cm 3 400 mg / cm 3 500 mg / cm 3 600 mg / cm 3 700mg / cm 3 Or 750 mg / cm 3 wait.

[0025] Preferably, the mass ratio of the strip-shaped fuel to the high thermal conductivity combustion carrier is (10-40):1. The (10-40) can be, for example, 10, 15, 20, 25, 30, 35, or 40.

[0026] Preferably, the strip-shaped fuel comprises reconstituted tobacco leaves.

[0027] Preferably, the covering material is shaped paper.

[0028] Preferably, the surface coating material of the covering material includes attapulgite clay and / or sodium chloride.

[0029] Preferably, the content of the surface coating is 0.5-5 mg / cm³. 2 For example, it could be 0.5 mg / cm³. 2 1 mg / cm 2 1.5 mg / cm 2 2 mg / cm 2 2.5 mg / cm 2 3 mg / cm 2 3.5 mg / cm 2 4 mg / cm 2 4.5 mg / cm 2 Or 5 mg / cm 2 wait.

[0030] Fourthly, the present invention provides an application of the microstructure-based directional heat flow generation system according to the third aspect in the preparation of heated cigarettes.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] 1. The high thermal conductivity combustion carrier of this invention is composed of a polymer, a thermally conductive filler, and additives. The polymer acts as a binder, fixing the combustion carrier into strip-shaped units; the thermally conductive filler enhances the thermal conductivity of the combustion carrier; and the additives enhance its combustion performance. The combination of these three components gives the combustion carrier both good thermal conductivity and certain combustion performance. This allows it to be used in heating cigarette core materials to improve the heat transfer efficiency of the heating element in electric heating devices, and also as fuel to create an efficient directional heat flow field within the coating layer during combustion, providing an effective heat source for the release of aerosols from the heated cigarette core material.

[0033] 2. The microstructured directional heat flow generation system constructed in this invention releases heat through the combustion of strip-shaped fuel. This heat is effectively conducted through a highly thermally conductive combustion carrier, and the slow combustion characteristics of the coating material effectively reduce heat loss during the combustion process. This heat flow generation system is used to heat the front end of a cigarette. When the system is ignited and inhaled, the heat released by combustion flows directionally, providing a heat source for the subsequent heating of the cigarette core material. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of a microstructured directional heat flow generation system.

[0035] Among them, 1-combustion carrier, 2-strip fuel, 3-coating material. Detailed Implementation

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0037] The sources of materials used in the following embodiments:

[0038] Formed paper: basis weight 100g / m 2 Provided by Jiangsu China Tobacco Industry Co., Ltd.

[0039] Tobacco sheets: Materials mainly composed of tobacco powder are prepared into sheets through methods such as rolling, slurry making, and papermaking.

[0040] Preparation Example 1

[0041] This preparation example demonstrates the fabrication of a high thermal conductivity combustion carrier based on a microstructure.

[0042] The combustion carrier is made from polymer, aluminum nitride, and plant fiber. The polymer is a mixture of polyamide and dipropylene glycol dibenzoate in a mass ratio of 1:0.2. The mass ratio of polymer, aluminum nitride, and plant fiber is 1:0.5:2. After the above raw materials are mixed evenly, they are heated to 150°C. After mixing, the mixture is placed into a mold and extruded to form a high thermal conductivity combustion carrier in the shape of a cylindrical strip with a diameter of 1.5 mm. The outer circumference of the cylinder has an average depth of 0.2 mm and a length of 20 mm.

[0043] Preparation Example 2

[0044] This preparation example demonstrates the fabrication of a high thermal conductivity combustion carrier based on a microstructure.

[0045] The combustion carrier is made from polymer, graphite, and starch. The polymer is a mixture of polyamide and dipropylene glycol dibenzoate in a mass ratio of 1:0.5. The mass ratio of polymer, graphite, and starch is 1:0.2:1. After the above raw materials are mixed evenly, they are heated to 110°C. The mixture is then poured into a mold and extruded to form a high thermal conductivity combustion carrier in the shape of a cuboid strip with a cross-sectional length of 1.5 mm, a width of 0.3 mm, and a length of 20 mm.

[0046] Preparation Example 3

[0047] This preparation example demonstrates the fabrication of a high thermal conductivity combustion carrier based on a microstructure.

[0048] The combustion carrier is made from polymer, copper oxide, and plant fiber. The polymer is a mixture of polyamide and dipropylene glycol dibenzoate in a mass ratio of 1:0.4. The mass ratio of polymer, copper oxide, and plant fiber is 1:0.3:2. After the above raw materials are mixed evenly, they are heated to 250°C. The mixture is then poured into a mold and extruded to form a high thermal conductivity combustion carrier in the shape of a spiral strip with a diameter of 1.5 mm, a pitch of 1.5 mm, and a length of 20 mm.

[0049] Preparation Example 4

[0050] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that aluminum nitride is replaced with potassium permanganate. Otherwise, they are the same as Preparation Example 1.

[0051] Preparation Example 5

[0052] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that the plant fiber is replaced with tobacco powder. Otherwise, they are the same as Preparation Example 1.

[0053] Preparation Example 6

[0054] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that the polymer is replaced with carboxymethyl cellulose. Otherwise, they are the same as Preparation Example 1.

[0055] Preparation Example 7

[0056] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that polyamide is not added. Instead, the weight parts of polyamide are allocated to dipropylene glycol dibenzoate in the same proportion as in Preparation Example 1. All other aspects are the same as in Preparation Example 1.

[0057] Preparation Example 8

[0058] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that dipropylene glycol dibenzoate is not added. Instead, the weight parts of dipropylene glycol dibenzoate are allocated to the polyamide in the same proportion as in Preparation Example 1. All other aspects are the same as in Preparation Example 1.

[0059] Preparation Example 9

[0060] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that the mass ratio of polyamide to dipropylene glycol dibenzoate is 1:0.8. All other aspects are the same as Preparation Example 1.

[0061] Preparation Example 10

[0062] This preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that the mass ratio of polymer, aluminum nitride, and plant fiber is 1:1:1. All other aspects are the same as in Preparation Example 1.

[0063] Comparative Preparation Example 1

[0064] This comparative preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that aluminum nitride is not added, and the weight parts of aluminum nitride are allocated to the polymer and plant fiber according to the proportion of Preparation Example 1. All other aspects are the same as Preparation Example 1.

[0065] Comparative Preparation Example 2

[0066] This comparative preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that no polymer is added. Instead, the weight parts of the polymer are allocated to aluminum nitride and plant fibers in the same proportion as in Preparation Example 1. All other aspects are the same as in Preparation Example 1.

[0067] Comparative preparation example 3

[0068] This comparative preparation example prepares a high thermal conductivity combustion carrier based on a microstructure. The only difference between this example and Preparation Example 1 is that plant fibers are not added. Instead, the weight proportions of plant fibers are allocated to aluminum nitride and polymer in the same proportion as in Preparation Example 1. All other aspects are the same as in Preparation Example 1.

[0069] Example 1

[0070] This embodiment prepares a microstructure-based directional heat flow generation system.

[0071] The surface was coated with 2.5 mg / cm 2 The attapulgite clay forming paper was used to wrap 30 strips of fuel and the high thermal conductivity combustion carrier prepared in Example 1. The mass ratio of the strip fuel to the high thermal conductivity combustion carrier was 40:1, and the filling density was 400 mg / cm³. 3The prepared directional heat flow generation system is a cylinder with a diameter of 7.2 mm and a length of 20 mm, and its specific structure is as follows: Figure 1 As shown.

[0072] The strip-shaped fuel is tobacco flakes.

[0073] Example 2

[0074] This embodiment prepares a microstructure-based directional heat flow generation system.

[0075] The surface is coated with 0.5 g / cm 2 60 strips of fuel and a high thermal conductivity combustion carrier prepared in Example 2 were wrapped in attapulgite clay forming paper. The mass ratio of the strip fuel to the high thermal conductivity combustion carrier was 10:1, and the filling density was 150 mg / cm³. 3 The prepared directional heat flow generation system is a cylinder with a diameter of 7.2 mm and a length of 20 mm, and its specific structure is as follows: Figure 1 As shown.

[0076] The strip-shaped fuel is tobacco flakes.

[0077] Example 3

[0078] This embodiment prepares a microstructure-based directional heat flow generation system.

[0079] The surface is coated with 2.5 g / cm 2 Sixteen strips of fuel and a high thermal conductivity combustion carrier prepared in Preparation Example 3 were wrapped in attapulgite clay forming paper. The mass ratio of the strip fuel to the high thermal conductivity combustion carrier was 30:1, and the filling density was 700 mg / cm³. 3 The prepared directional heat flow generation system is a cylinder with a diameter of 7.2 mm and a length of 20 mm, and its specific structure is as follows: Figure 1 As shown.

[0080] The strip-shaped fuel is tobacco flakes.

[0081] Examples 4-10

[0082] This embodiment prepares a microstructure-based directional heat flow generation system. The only difference between this system and Example 1 is that the system uses the high thermal conductivity combustion carriers prepared in Examples 4-10, while the rest is the same as Example 1.

[0083] Example 11

[0084] This embodiment prepares a microstructure-based directional heat flow generation system, which differs from Example 1 only in that the packing density is 800 mg / cm³. 3 Everything else is the same as in Example 1.

[0085] Example 12

[0086] This embodiment prepares a microstructure-based directional heat flow generation system, which differs from Example 1 only in that the packing density is 100 mg / cm³. 3 Everything else is the same as in Example 1.

[0087] Comparative Examples 1-3

[0088] This comparative example prepares a microstructure-based directional heat flow generation system. The only difference between this system and Example 1 is that the system uses the high thermal conductivity combustion carrier prepared in Comparative Preparation Examples 1-3, while the rest is the same as Example 1.

[0089] Comparative Example 4

[0090] This comparative example prepares a microstructure-based directional heat flow generation system. The only difference between this system and Example 1 is that a high thermal conductivity combustion carrier is not added; otherwise, they are identical to Example 1.

[0091] Comparative Example 5

[0092] This comparative example prepares a microstructure-based directional heat flow generation system. The only difference between this system and Example 1 is that the surface of the forming paper is not coated; otherwise, they are identical to Example 1.

[0093] Test Example 1

[0094] This test case investigates the combustion time of the aforementioned directional heat flow generation system. The specific operation is as follows: An existing heated cigarette was connected to the high-efficiency combustion system to form a sample cigarette. A line was drawn 2 mm from the heated cigarette core material on the high-efficiency combustion system. The sample cigarette was lit and inhaled using a smoking machine. The inhalation time was set to 3 s / puff, the inhalation frequency to 30 s / puff, and the inhalation volume to 55 ml / puff. Inhalation ceased and the cigarette was extinguished when the high-efficiency combustion system reached the marked line. The combustion time of the heat flow generation system was recorded. The results are shown in Table 1.

[0095] Table 1

[0096]

[0097] In this invention, polyamide is used as a binder for the combustion carrier, and dipropylene glycol dibenzoate is mixed with polyamide as a polymer, which improves the flexibility and processability of the combustion carrier. Since polyamide was not added in Preparation Example 7, the combustion carrier could not be molded. Similarly, the combustion carrier in Comparative Preparation Example 2, which did not contain a polymer, could not be molded. Furthermore, the packing in Example 11 was too dense, making the cigarette prone to spontaneous combustion during ignition and inhalation, hindering proper combustion. Therefore, Table 1 lacks test data for Example 7, Comparative Example 2, and Example 11.

[0098] The results above show that: (1) As can be seen from Examples 1-3 and Comparative Example 4, the combustion carrier prepared by the present invention is a strip-shaped unit. In this structure, the polymer acts as a binder to fix the combustion carrier into a strip-shaped unit; the thermally conductive filler improves the thermal conductivity of the combustion carrier; and the additives improve the combustion performance of the combustion carrier. The combination of these three elements gives the combustion carrier both good thermal conductivity and certain combustion performance.

[0099] (2) As can be seen from Examples 1 and 4-6, the combustion carrier polymer, thermally conductive filler, and additives in this invention have a synergistic effect; the absence of any one of them will reduce the heat transfer efficiency. In Example 4, the addition of potassium permanganate accelerated the combustion speed of the heat flow generation system, but the lack of aluminum nitride as a thermally conductive filler in the combustion carrier significantly reduced its thermal conductivity, thus affecting the heat transfer of the heat flow generation system. In Example 5, after replacing the plant fiber in the combustion carrier with tobacco powder, the combustion speed of the combustion carrier was slower than that of the strip fuel, and the combustion speeds of the two were mismatched. In Example 6, replacing the polymer in the combustion carrier with carboxymethyl cellulose resulted in a faster combustion speed of the combustion carrier, affecting the heat transfer efficiency of the heat flow generation system.

[0100] (3) As can be seen from Examples 1 and 8-9, the polymer in this invention has a structural plasticity effect. Outside the scope of this invention, it will lead to a structure that is too hard or too soft, affecting heat transfer. The combustion carrier does not contain dipropylene glycol dibenzoate, so the combustion carrier is relatively hard and has poor formability. If the amount of dipropylene glycol dibenzoate added to the combustion carrier is too high, the combustion carrier is relatively soft and its hardness is insufficient, which affects the thermal conductivity.

[0101] (4) As can be seen from Examples 1 and 10 and Comparative Example 1, the thermally conductive filler exceeds the scope of this invention. If the filler is too high, the combustion carrier is prone to extinguishing; if it is too low (or absent), the combustion carrier burns quickly, and both will affect heat transfer. The aluminum nitride thermally conductive filler in the combustion carrier exceeds the scope of this invention (too high), and the combustion carrier is prone to extinguishing. The extinguished combustion carrier blocks the airflow channel, affecting the combustibility and heat transfer effect of the heat flow generation system. Without aluminum nitride thermally conductive filler in the combustion carrier, the combustion carrier burns faster, the thermal conductivity of the combustion carrier is poor, and the heat transfer of the heat flow generation system is affected.

[0102] (5) As can be seen from Examples 1 and 11-12, if the filling density is too high, heat and flue gas cannot circulate, resulting in premature extinguishing and wasting subsequent fuel; while if the filling density is too low, the structure is loose, the heat flow generation system burns too fast, the structure after combustion has low support, and the combustion is easy to turn around.

[0103] (6) By comparing Example 1 and Comparative Example 3, it can be seen that the material of the high thermal conductivity combustion carrier of the present invention has a synergistic effect. The lack of plant fiber makes the combustion carrier burn too slowly. After the strip fuel is burned, the combustion carrier is still burning, and the combustion speed of the two is poorly matched.

[0104] (7) The comparison between Example 1 and Comparative Example 5 shows that the coating on the outside of the forming paper can slow down the combustion rate and encapsulate the heat in the directional heat flow generation system, thereby improving the carbonization rate of the heated cigarette core material. In Comparative Example 5, the surface of the forming paper is not coated, and the heat flow generation system burns faster, which affects the carbonization effect of the cigarette core material.

[0105] In summary, the high thermal conductivity combustion carrier of the present invention can effectively conduct heat released by the fuel and reduce heat loss. Based on this, a directional heat flow generation system is constructed. When the heat flow generation system is ignited and drawn in, the heat released by the combustion of the heat flow generation system flows in a directional manner, which can provide a heat source for heating the heat release of the cigarette core material.

[0106] 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 high thermal conductivity combustion carrier based on microstructure, characterized in that, The combustion carrier comprises a polymer, a thermally conductive filler, and an additive; the combustion carrier is a strip-shaped unit.

2. The high thermal conductivity combustion carrier based on microstructure according to claim 1, characterized in that, The mass ratio of the polymer, thermally conductive filler, and additives is 1:(0.2-0.5):(1-2).

3. The high thermal conductivity combustion carrier based on microstructure according to claim 1 or 2, characterized in that, The polymer contains polyamide and / or dipropylene glycol dibenzoate; Preferably, the polymer contains polyamide and dipropylene glycol dibenzoate; Preferably, the mass ratio of the polyamide to dipropylene glycol dibenzoate is 1:(0.2-0.5).

4. The high thermal conductivity combustion carrier based on microstructure according to any one of claims 1-3, characterized in that, The thermally conductive filler includes any one or a combination of at least two of metal nitrides, metal oxides, or graphite; Preferably, the metal nitride comprises aluminum nitride and / or boron nitride; Preferably, the metal oxide includes any one or a combination of at least two of copper oxide, aluminum oxide, zinc oxide, or manganese oxide.

5. The high thermal conductivity combustion carrier based on microstructure according to any one of claims 1-4, characterized in that, The adjuvants include plant fiber and / or starch; Preferably, the shape of the strip unit includes any one of cylinder, cuboid, spiral or external groove.

6. The method for preparing a high thermal conductivity combustion carrier based on a microstructure according to any one of claims 1-5, characterized in that, The preparation method includes mixing a polymer, a thermally conductive filler, and an additive, heating the mixture, and then extruding it into a mold.

7. The preparation method according to claim 6, characterized in that, The heating temperature is 110℃-250℃.

8. A directional heat flow generation system based on microstructure, characterized in that, The directional heat flow generation system includes strip-shaped fuel, coating material, and a microstructure-based high thermal conductivity combustion carrier as described in any one of claims 1-6.

9. The microstructure-based directional heat flow generation system according to claim 8, characterized in that, The strip-shaped fuel and the high thermal conductivity combustion carrier are wrapped with a coating material and arranged along their length. Preferably, the packing density of the strip fuel and the high thermal conductivity combustion carrier in the directional heat flow generation system is 150 mg / cm³. 3 -750 mg / cm 3 ; Preferably, the volume ratio of the strip-shaped fuel to the high thermal conductivity combustion carrier is (10-40):1; Preferably, the strip-shaped fuel is reconstituted tobacco shreds; Preferably, the covering material is shaped paper; Preferably, the surface coating material of the covering material includes attapulgite clay and / or sodium chloride.

10. The application of a microstructure-based directional heat flow generation system according to claim 8 or 9 in the preparation of heated cigarettes.

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