Thermal insulation material for combustion type heating cigarette as well as preparation method and application of thermal insulation material

Abstract

The invention provides a thermal insulation material for combustion type heating cigarettes as well as a preparation method and application of the thermal insulation material. The thermal insulation material comprises the following components: aerogel particles, hollow glass beads, ceramic fibers and expanded graphite. When the thermal insulation material is applied to combustion type heating cigarettes, the thermal insulation environment can be effectively constructed, the thermal loss of the cigarettes is reduced, the thermal uniformity and the utilization efficiency are improved, and finally the technical effect of more complete carbonization of cigarette core materials is achieved.

Description

Technical Field

[0001] This invention belongs to the field of cigarette technology, specifically relating to a heat insulation material for combustion-type heated cigarettes, its preparation method, and its application. Background Technology

[0002] Currently, most heated cigarettes adopt a separate design of "device + cartridge". Their working principle is that a dedicated heating element (or heating needle) inside the electronic device precisely heats the tobacco material in the cartridge, causing it to thermally decompose at around 300°C and release aerosol. However, this separate design has inherent drawbacks: consumers must carry and rely on a dedicated electronic device. The device requires charging and maintenance, is prone to malfunction, and has a relatively high initial purchase cost. These factors cause inconvenience to users, limit usage scenarios, and affect the acceptance of the device by some consumers.

[0003] To overcome reliance on specialized smoking devices, we explored the technology of "device-free" heated cigarettes. Ideally, this product would function like a traditional cigarette, providing self-sustaining heat upon ignition, with the filler material undergoing only thermal decomposition without direct combustion. However, in heated cigarettes, the combustion section and the filler section are closely adjacent. While the heat generated by the combustion section is transferred axially to the filler section, it is also radially lost to the environment through the filler's wrapping material (usually ordinary cigarette paper). This radial heat loss leads to two serious problems: On the one hand, heat utilization is low: precious and limited heat is wasted, resulting in a reduction in the net energy available for the core pyrolysis process.

[0004] On the other hand, the temperature field is uneven: the temperature is low at the periphery of the core section and high at the center, forming a large radial temperature gradient. This results in uneven heating of the core material, with only the central part being fully carbonized and decomposed, while the peripheral part does not react sufficiently, leading to low overall aerosol generation efficiency and inconsistent sensory quality.

[0005] Regarding the heat management issues of mainstream heated cigarettes, existing technological improvements mainly focus on the following two aspects: First, the insulation design at the smoking device end: Extensive research has been dedicated to optimizing the insulation performance of the device itself, such as using vacuum insulated tubes (VITs) to prevent heat loss to the device shell and improve energy efficiency. Second, cooling technology at the smoke end: To address the issue of excessively high smoke temperatures in heated cigarettes affecting the user experience, industry R&D focuses on adding various cooling materials to the filter section, such as polylactic acid (PLA) and polyethylene glycol / cellulose diacetate (PEG / CDA) composite membranes, to absorb heat from the smoke. The former is an external optimization for split-type products and is unrelated to the design of "no-smoker" products; the latter aims to reduce the temperature of already generated smoke, rather than reducing heat loss from the cigarette core itself during the heating stage. Therefore, existing technologies have failed to solve the radial heat dissipation problem of the cigarette core section in "no-smoker" combustion-type heated cigarettes. In summary, current technologies lack a material that can be directly applied to the wrapping of cigarette core sections to effectively block radial heat loss without affecting smoke generation and passage. This would reduce radial heat loss during the heating process, efficiently transfer and "lock" the limited heat generated in the combustion section within the core section, thereby improving heat utilization efficiency, enhancing temperature uniformity, and ultimately achieving more complete and consistent thermal decomposition. Therefore, an innovative heat insulation material and its application are urgently needed to promote the high-quality development of smokeless, heated cigarettes. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a heat-insulating material for combustion-type heated cigarettes, its preparation method, and its application. When applied to combustion-type heated cigarettes, the heat-insulating material of this invention can effectively create a heat-preserving environment, reduce heat loss from the cigarette, improve thermal uniformity and utilization efficiency, and ultimately achieve the technical effect of more complete carbonization of the cigarette core material.

[0007] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a heat insulation material for combustion-type heated cigarettes, the components of which include aerogel particles, hollow glass microspheres, ceramic fibers and expanded graphite.

[0008] In the thermal insulation material of the present invention, the aerogel particles have a nanoporous structure, which greatly restricts the movement of gas molecules and solid heat conduction; the hollow glass microspheres have a closed hollow structure, which can cut off the solid phase conduction path; the ceramic fibers can prevent other particle fillers from settling or compacting, and prevent the formation of rapid heat transfer channels due to local compaction; the expanded graphite can expand at high temperature to form a worm-like fluffy structure, increasing the microporous structure of the material; the combination of the four has a synergistic effect in thermal insulation, which can significantly reduce the effective thermal conductivity and greatly reduce the material density.

[0009] Preferably, the thermal insulation material comprises, by weight, 0.5-1 parts aerogel particles, 1-2.5 parts hollow glass microspheres, 2-4 parts ceramic fibers, and 0.1-1 parts expanded graphite.

[0010] The amount of aerogel particles added in the thermal insulation material of the present invention can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, etc.; The amount of hollow glass microspheres added can be 1.1 parts, 1.3 parts, 1.5 parts, 1.7 parts, 1.9 parts, 2 parts, 2.2 parts, or 2.4 parts, etc.; The amount of ceramic fiber added can be 2.2 parts, 2.4 parts, 2.8 parts, 3.0 parts, 3.2 parts, 3.5 parts, 3.7 parts, or 3.9 parts, etc.; The amount of expanded graphite added can be 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, etc.

[0011] Preferably, the composition of the thermal insulation material further includes a dispersant and / or a binder.

[0012] Preferably, the thermal insulation material further comprises, by weight, 3-6 parts of dispersant (e.g., 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts or 6 parts, etc.) and 0.1-0.5 parts of binder (e.g., 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts, etc.).

[0013] Preferably, the dispersant includes water glass, silica sol, polyacrylamide, and silane coupling agent.

[0014] Preferably, in the dispersant, water glass and silica sol are used as slurry matrix dispersants, polyacrylamide is used as a pre-dispersant for ceramic fibers, and silane coupling agent is used as a pre-dispersant for expanded graphite.

[0015] Preferably, the mass ratio of water glass, silica sol, polyacrylamide, and silane coupling agent is 1:(1-3):(0.08-0.1):(0.05-0.1), for example, it can be 1:1.1:0.082:0.055, 1:1.3:0.084:0.06, 1:1.5:0.086:0.065, 1:1.7:0.088:0.07, 1:1.9:0.09:0.075, 1:2:0.092:0.08, 1:2.1:0.094:0.085, 1:2.3:0.096:0.09, 1:2.5:0.098:0.095, or 1:2.9:0.1:0.1, etc.

[0016] Preferably, the binder comprises gelatinized starch and / or sodium carboxymethyl cellulose.

[0017] All the specific point values ​​within the above range can be selected, and will not be elaborated on here.

[0018] In a second aspect, the present invention provides a method for preparing a heat-insulating material for combustion-type heated cigarettes as described in the first aspect, the method comprising mixing aerogel particles, hollow glass microspheres, ceramic fibers and expanded graphite in water, and drying the mixture to obtain the heat-insulating material for combustion-type heated cigarettes.

[0019] Preferably, the preparation method includes: (1) Polyacrylamide is mixed with ceramic fibers to obtain pretreated ceramic fibers; silane coupling agent is mixed with expanded graphite to obtain pretreated expanded graphite; (2) Add water glass, silica sol and binder to water, mix and then add pretreated ceramic fiber, pretreated expanded graphite, hollow glass microspheres and aerogel particles in sequence, stir evenly, and dry to obtain the heat insulation material for combustion-type heated cigarettes.

[0020] Preferably, the stirring speed in step (2) is 60-120 rpm (e.g., 60 rpm, 70 rpm, 80 rpm, 90 rpm, 100 rpm, 110 rpm or 120 rpm, etc.), and the time is 30-60 min (e.g., 35 min, 40 min, 45 min, 50 min or 55 min, etc.).

[0021] All the specific point values ​​within the above range can be selected, and will not be elaborated on here.

[0022] Thirdly, the present invention provides the application of the heat-insulating material for combustion-type heated cigarettes as described in the first aspect in the preparation of cigarettes.

[0023] Preferably, the surface of the cigarette paper is coated with a heat-insulating material for combustion-type heated cigarettes as described in the first aspect.

[0024] Preferably, the heat-insulating material for combustion-type heated cigarettes is coated on the inner surface of the cigarette paper.

[0025] Preferably, the coating amount of the thermal insulation material is 0.001-0.02 g / cm³. 2 For example, it can be 0.001 g / cm³. 2 0.005 g / cm 2 0.01 g / cm 2 0.015 g / cm 2 Or 0.02 g / cm2 wait.

[0026] Preferably, the thermal insulation material, after being coated onto the cigarette paper, makes the thermal conductivity of the cigarette paper <0.04 W / (m•K), for example, it can be 0.01 W / (m•K), 0.02 W / (m•K), 0.03 W / (m•K) or 0.04 W / (m•K), etc.

[0027] All the specific point values ​​within the above range can be selected, and will not be elaborated on here.

[0028] Fourthly, the present invention provides the application of the heat-insulating cigarette paper as described in the third aspect in the preparation of combustion-type heated cigarettes.

[0029] Fifthly, the present invention provides a combustion-type heated cigarette, the combustion-type heated cigarette comprising a combustion section, a core section and a filter section connected coaxially in sequence; The combustion section, the core section, and the filter section are formed by wrapping cigarette paper. The cigarette paper wrapped around the core segment is the heat-insulating cigarette paper as described in the fourth aspect.

[0030] This invention effectively creates a thermal insulation environment by introducing a heat insulation functional layer into the core section, reducing heat loss, improving thermal uniformity and utilization efficiency, and ultimately achieving the technical effect of more complete carbonization of the core material.

[0031] Compared with the prior art, the present invention has the following beneficial effects: (1) The heat insulation material of the present invention can provide a heat insulation and heat preservation wrapping material for the core section, effectively reducing the radial loss of heat to the environment.

[0032] (2) The heat insulation material of the present invention provides the same total heat in the combustion section, and significantly improves the effective heat power and total energy acting on the core material itself by reducing losses.

[0033] (3) The heat insulation material of the present invention can reduce the internal temperature gradient by improving the radial heat preservation of the tobacco core section, so that the tobacco material can be closer to the optimal thermal decomposition temperature range from the periphery to the center, thereby achieving more complete and uniform carbonization. Detailed Implementation

[0034] 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.

[0035] Example 1 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The components of the heat insulation material, by weight, are 0.8 parts aerogel particles, 2 parts hollow glass microspheres, 3 parts ceramic fibers, 0.5 parts expanded graphite, 5 parts dispersant, and 0.3 parts binder. The dispersant comprises water glass, silica sol, polyacrylamide, and silane coupling agent in a mass ratio of 1:2:0.09:0.06; The binder is gelatinized starch and sodium carboxymethyl cellulose in a mass ratio of 1:1.

[0036] The method for preparing the heat insulation material for combustion-type heated cigarettes is as follows: (1) Polyacrylamide is mixed with ceramic fibers to obtain pretreated ceramic fibers; (2) Mix the silane coupling agent with expanded graphite to obtain pretreated expanded graphite; (3) Add water glass, silica sol and binder to water, mix and then add pretreated ceramic fiber, pretreated expanded graphite, hollow glass microspheres and aerogel particles in sequence. Then stir and mix at 100 rpm for 45 min and dry to obtain the heat insulation material for combustion-type heated cigarettes.

[0037] Example 2 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The components of the heat insulation material, by weight, are 0.5 parts aerogel particles, 1 part hollow glass microspheres, 2 parts ceramic fibers, 0.2 parts expanded graphite, 3 parts dispersant, and 0.12 parts binder. The dispersant comprises water glass, silica sol, polyacrylamide, and silane coupling agent in a mass ratio of 1:3:0.085:0.06; The binder includes sodium carboxymethyl cellulose.

[0038] The method for preparing the heat insulation material for combustion-type heated cigarettes is as follows: (1) Polyacrylamide is mixed with ceramic fibers to obtain pretreated ceramic fibers; (2) Mix the silane coupling agent with expanded graphite to obtain pretreated expanded graphite; (3) Add water glass, silica sol and binder to water, mix and then add pretreated ceramic fiber, pretreated expanded graphite, hollow glass microspheres and aerogel particles in sequence. Then stir and mix at 80 rpm for 60 min and dry to obtain the heat insulation material for combustion-type heated cigarettes.

[0039] Example 3 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The components of the heat insulation material, by weight, are 0.8 parts aerogel particles, 2.5 parts hollow glass microspheres, 4 parts ceramic fibers, 1 part expanded graphite, 6 parts dispersant, and 0.4 parts binder. The dispersant comprises water glass, silica sol, polyacrylamide, and silane coupling agent in a mass ratio of 1:1:0.1:0.1; The binder includes gelatinized starch.

[0040] The method for preparing the heat insulation material for combustion-type heated cigarettes is as follows: (1) Polyacrylamide is mixed with ceramic fibers to obtain pretreated ceramic fibers; (2) Mix the silane coupling agent with expanded graphite to obtain pretreated expanded graphite; (3) Add water glass, silica sol and binder to water, mix and then add pretreated ceramic fiber, pretreated expanded graphite, hollow glass microspheres and aerogel particles in sequence. Then stir and mix at 90 rpm for 40 min and dry to obtain the heat insulation material for combustion-type heated cigarettes.

[0041] Example 4 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and that of Embodiment 1 is that the material does not contain a dispersant. The other components and their amounts are the same as those of Embodiment 1, and the preparation method is the same as that of Embodiment 1.

[0042] Example 5 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and that of Embodiment 1 is that the dispersant does not include water glass, and the amount of dispersant and the proportion of other components of the dispersant remain unchanged. The other components and their amounts are consistent with those of Embodiment 1, and the preparation method is the same as that of Embodiment 1.

[0043] Example 6 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and that of Embodiment 1 is that the dispersant does not include silica sol, and the amount of dispersant and the proportion of other components of the dispersant remain unchanged. The other components and their amounts are consistent with those of Embodiment 1, and the preparation method is the same as that of Embodiment 1.

[0044] Example 7 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and that of Embodiment 1 is that the dispersant does not include polyacrylamide, and the amount of dispersant and the proportion of other components of the dispersant remain unchanged. The other components and their amounts are consistent with those of Embodiment 1. The preparation method is the same as that of Embodiment 1 (the ceramic fiber is not pretreated).

[0045] Example 8 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and that of Embodiment 1 is that the dispersant does not include a silane coupling agent, and the amount of dispersant and the proportion of other components of the dispersant remain unchanged. The other components and their amounts are consistent with those of Embodiment 1. The preparation method is the same as that of Embodiment 1 (expanded graphite is not pretreated).

[0046] Example 9 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The components of the heat insulation material, by weight, are 2 parts aerogel particles, 0.5 parts hollow glass microspheres, 6 parts ceramic fibers, 1.5 parts expanded graphite, 5 parts dispersant, and 0.3 parts binder. The dispersant comprises water glass, silica sol, polyacrylamide, and silane coupling agent in a mass ratio of 1:2:0.09:0.06; The binder is gelatinized starch and sodium carboxymethyl cellulose in a mass ratio of 1:1.

[0047] The preparation method of the heat insulation material for combustion-type heated cigarettes is as described in Example 1.

[0048] Example 10 This embodiment provides a heat insulation material for combustion-type heated cigarettes. The components of the heat insulation material, by weight, are 0.1 parts aerogel particles, 3 parts hollow glass microspheres, 1 part ceramic fiber, 2 parts expanded graphite, 5 parts dispersant, and 0.3 parts binder. The dispersant comprises water glass, silica sol, polyacrylamide, and silane coupling agent in a mass ratio of 1:2:0.09:0.06; The binder is gelatinized starch and sodium carboxymethyl cellulose in a mass ratio of 1:1.

[0049] The preparation method of the heat insulation material for combustion-type heated cigarettes is as described in Example 1.

[0050] Comparative Example 1 This comparative example provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and Example 1 is that it does not include aerogel particles in its composition. The reduction is made up by hollow glass microspheres, ceramic fibers and expanded graphite in proportion to the parts. Other components and amounts are the same as in Example 1, and the preparation method is the same as in Example 1.

[0051] Comparative Example 2 This comparative example provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and Example 1 is that the hollow glass microspheres are not included in the composition. The reduction is made up by aerogel particles, ceramic fibers and expanded graphite in proportion. Other components and amounts are the same as in Example 1, and the preparation method is the same as in Example 1.

[0052] Comparative Example 3 This comparative example provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and Example 1 is that it does not include ceramic fibers in its composition. The reduction is made up by aerogel particles, hollow glass microspheres and expanded graphite in proportion to the proportions. Other components and amounts are the same as in Example 1, and the preparation method is the same as in Example 1.

[0053] Comparative Example 4 This comparative example provides a heat insulation material for combustion-type heated cigarettes. The only difference between the heat insulation material and Example 1 is that it does not include expanded graphite in its components. The reduction is made up by aerogel particles, hollow glass microspheres and ceramic fibers in proportion. Other components and amounts are the same as in Example 1, and the preparation method is the same as in Example 1.

[0054] Application Example 1 This application example provides a combustion-type heated cigarette, which includes a combustion section, a core section, and a filter section connected coaxially in sequence; The combustion section is 16 mm long, the core section is 25 mm long, and the filter section is 30 mm long. The diameter of the combustion-type heated cigarette is 8.4 mm; The combustion section, the core section, and the filter section are formed by wrapping cigarette paper. The inner surface of the cigarette paper wrapping the core segment is coated with the heat-insulating material of Example 1 (coating amount is 0.02 g / cm). 2 ); The combustion section is composed of plant fiber and carbon powder in a mass ratio of 3:1. The components of the tobacco core segment, by weight, are 18 parts tobacco, 6 parts glycerin, 0.5 parts sweet orange oil, and 0.5 parts carboxymethyl cellulose; The filter tip section is made of cellulose acetate.

[0055] Application Example 2-10 The application examples provide seven types of combustion-type heated cigarettes. The only difference between these combustion-type heated cigarettes and Application Example 1 is that the heat insulation material coated on the inner surface of the cigarette paper wrapped around the core segment is the same amount of the heat insulation material provided in Examples 2-8. The rest of the structure and components used are the same as in Application Example 1.

[0056] Compare and contrast examples 1-4 The comparative application examples provide four types of combustion-type heated cigarettes. The only difference between these combustion-type heated cigarettes and Application Example 1 is that the heat insulation material coated on the inner surface of the cigarette paper wrapped around the core segment is the same amount of the heat insulation material provided in Comparative Examples 1-4. The rest of the structure and the components used are the same as in Application Example 1.

[0057] Comparative Application Example 5 This comparative application example provides a combustion-type heated cigarette. The only difference between the combustion-type heated cigarette and Application Example 1 is that the inner surface of the cigarette paper wrapped around the core segment is not coated with heat-insulating material, but is ordinary cigarette paper. The rest of the structure and components used are the same as those in Application Example 1.

[0058] Test Example 1 The thermal conductivity of cigarette paper coated with insulating material was tested according to the method of GB / T 10295-2008, corresponding to Example 1-10 and Comparative Application Example 1-4. Ordinary cigarette paper without any insulating material was used as a control group for testing. Each sample was measured 10 times, and the values ​​were used to calculate the multiple standard deviation (RSD) to determine the uniformity of the application of the insulating material. The results are shown in Table 1.

[0059] Table 1 As shown in Table 1, compared with ordinary cigarette paper, the thermal conductivity of the cigarette paper after the heat insulation material prepared in Examples 1-3 of this invention is coated is <0.02 W / (m•K), indicating that the material has excellent heat insulation effect.

[0060] As can be seen from Examples 4-8, when there is no dispersant, or the dispersant is not the type selected in this invention, sedimentation and agglomeration will occur during material preparation, which will affect whether the material can be uniformly coated on cigarette paper. From the RSD, the thermal conductivity of different regions is very different, resulting in an RSD much larger than that of Examples 1-3, indicating that the material coating is not uniform. As can be seen from Examples 9-10, the ratio of aerogel particles, hollow glass microspheres, ceramic fibers and expanded graphite also affects the thermal insulation performance of the material; As can be seen from Comparative Examples 1-4, the aerogel particles, hollow glass microspheres, ceramic fibers and expanded graphite used together have a synergistic effect. The absence of any one of the four components will reduce the thermal insulation performance of the material.

[0061] Test Example 2 Thermocouple temperature sensors were embedded at different radial positions in the core segments of the combustion-type heated cigarettes used in Application Examples 1-10 and Comparative Application Examples 1-5. The cigarettes were then smoked on a smoking machine at a frequency of 30 s / puff and a volume of 55 mL / puff. After 300 s of smoking, the internal temperature of the core segment (0.5 mm) was measured using thermocouples during the 8th puff. Thermal imaging analysis was used to test the corresponding outer surface temperature of the core segment during the 8th puff. The core segments were then disassembled, and the carbonization effect of the heated core segments was compared and analyzed.

[0062] Carbonization effect analysis method: The hot airflow through the tobacco section flows from the end furthest from the filter tip towards the end closest to the filter tip. The carbonization of the core material in the tobacco section begins at the end furthest from the filter tip and gradually progresses longitudinally towards the end closest to the filter tip. Since the carbonization of the core material is affected by the heat conduction and heat transfer of the regulating section, the carbonization of the core material cross-section is relatively uniform. Therefore, the heating effect of the core material can be compared by analyzing the longitudinal carbonization length. In this invention, the total length of the tobacco core section is taken as 100 mm, and the percentage of the carbonized length to the total length represents the carbonization effect of the core material. The results are shown in Table 2.

[0063] Table 2 As shown in Table 2, compared with Comparative Example 5, the temperature difference between the surface and internal parts of the cigarette core section in Application Examples 1-3 after using heat insulation material is above 111 ℃, which is much higher than the 20 ℃ difference of the conventional cigarette core section in Comparative Example 5. This indicates that the technical solution of the present invention can better retain heat inside, greatly improving temperature uniformity. Moreover, compared with the conventional cigarette core section in Comparative Example 5, the present invention, by using heat insulation material in the cigarette core section, can achieve complete carbonization of the cigarette core, greatly improving the heat utilization efficiency.

[0064] The applicant declares that this invention illustrates a heat-insulating material for combustion-type heated cigarettes, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

[0065] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A heat insulation material for combustion-type heated cigarettes, characterized in that, The components of the thermal insulation material include aerogel particles, hollow glass microspheres, ceramic fibers, and expanded graphite.

2. The heat insulation material for combustion-type heated cigarettes as described in claim 1, characterized in that, The thermal insulation material comprises, by weight, 0.5-1 parts aerogel particles, 1-2.5 parts hollow glass microspheres, 2-4 parts ceramic fibers, and 0.1-1 parts expanded graphite.

3. The heat insulation material for combustion-type heated cigarettes as described in claim 1 or 2, characterized in that, The thermal insulation material also includes dispersants and / or binders; Preferably, the thermal insulation material further comprises 3-6 parts of dispersant and 0.1-0.5 parts of binder by weight; Preferably, the dispersant includes water glass, silica sol, polyacrylamide, and silane coupling agent; Preferably, the mass ratio of water glass, silica sol, polyacrylamide, and silane coupling agent is 1:(1-3):(0.08-0.1):(0.05-0.1). Preferably, the binder comprises gelatinized starch and / or sodium carboxymethyl cellulose.

4. A method for preparing a heat-insulating material for combustion-type heated cigarettes as described in any one of claims 1-3, characterized in that, The preparation method includes mixing aerogel particles, hollow glass microspheres, ceramic fibers and expanded graphite in water, and then drying to obtain the thermal insulation material.

5. The preparation method according to claim 4, characterized in that, The preparation method includes: (1) Polyacrylamide is mixed with ceramic fibers to obtain pretreated ceramic fibers; silane coupling agent is mixed with expanded graphite to obtain pretreated expanded graphite; (2) Add water glass, silica sol and binder to water, mix and then add pretreated ceramic fiber, pretreated expanded graphite, hollow glass microspheres and aerogel particles in sequence, stir evenly, and dry to obtain the heat insulation material for combustion-type heated cigarettes. Preferably, the stirring speed in step (2) is 60-120 rpm and the stirring time is 30-60 min.

6. The use of a heat-insulating material for combustion-type heated cigarettes as described in any one of claims 1-3 in the preparation of combustion-type heated cigarettes.

7. A type of combustible heated cigarette paper with heat insulation properties, characterized in that, The surface of the cigarette paper is coated with a heat-insulating material for combustion-type heated cigarettes as described in any one of claims 1-3.

8. The heat-insulating combustion-type heated cigarette paper as described in claim 7, characterized in that, The heat-insulating material for combustion-type heated cigarettes is coated on the inner surface of the cigarette paper; Preferably, the coating amount of the thermal insulation material is 0.001-0.02 g / cm³. 2 .

9. The application of a combustion-type heated cigarette paper with heat insulation properties as described in claim 7 or 8 in the preparation of cigarettes.

10. A combustion-type heated cigarette, characterized in that, The combustion-type heated cigarette includes a combustion section, a core section, and a filter section connected coaxially in sequence. The combustion section, the core section, and the filter section are formed by wrapping cigarette paper. The cigarette paper wrapped around the core segment is the heat-insulating cigarette paper as described in claim 7 or 8.

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