An aerogel for heating cigarettes, its preparation method and application

Abstract

This invention relates to an aerogel for heated cigarettes, its preparation method, and its application. The raw materials for preparing the heated cigarette aerogel, by weight, include 1-10 parts sodium alginate, 0.5-5 parts xanthan gum, 1-10 parts polyethylene glycol, and 15-25 parts calcium chloride. In this invention, xanthan gum and polyethylene glycol exhibit excellent biocompatibility. Sodium alginate is a natural polysaccharide, and alginate is rich in hydroxyl and carboxyl groups, both of which can react with calcium chloride. 2+ Cross-linking forms a network, and the network structure formed by the combination of these four components can not only effectively support materials such as smoke generators, but also capture particles larger than its micropores during flue gas flow. Furthermore, Ca... 2+ The strong affinity between the nitrosamine and the N-NO group of the negatively charged nitrosamine also promotes the reduction of nitrosamine release in flue gas.

Description

Technical Field

[0001] This invention belongs to the field of heated cigarette technology, specifically relating to an aerogel for heated cigarettes, its preparation method, and its application. Background Technology

[0002] Heated cigarettes effectively reduce environmental pollution and lower the potential health risks associated with smoking, making them one of the important directions for the future development of tobacco products. Although heated cigarettes have advantages such as low levels of harmful components, a milder smoking experience, less irritation, and a pleasant aroma, they also have the characteristics of rapid smoke dissipation and minimal sideflow smoke. Therefore, heated cigarettes typically require the addition of smoke-generating agents such as glycerol and propylene glycol.

[0003] CN112089086A discloses a process for preparing reconstituted tobacco leaves for heated cigarettes, comprising: (1) extracting and separating a mixture of tobacco stems, tobacco dust, and plant fibers using hot water to obtain solid insoluble matter and tobacco extract; (2) pulping and papermaking the solid insoluble matter to obtain reconstituted tobacco leaf substrates; (3) concentrating the tobacco extract; (4) taking a portion of the concentrated liquid, precipitating it with alcohol, concentrating it again, and mixing it with unprecipitated concentrated liquid, smoking agent, flavoring, tobacco powder, and adhesive to obtain a tobacco coating liquid; (5) coating the coating liquid onto the reconstituted tobacco leaf substrates, drying them using infrared and hot air, and then rerolling and slitting them; (6) subjecting the slitting reconstituted tobacco leaf products to three-stage rolling, then waxing them with a waxing machine, and then rerolling or tearing them to obtain reconstituted tobacco leaf products required for "ordered" and "disordered" heated cigarettes. The smoking agent used is one or a mixture of two of glycerol and propylene glycol.

[0004] CN109852476A discloses a flavoring agent, preparation method, and application suitable for low-temperature non-combustible smoke-generating products, relating to the technical field of low-temperature non-combustible smoke-generating products. The flavoring agent for low-temperature non-combustible smoke-generating products comprises a smoke-generating agent, tobacco extract, tobacco flavoring, an antitussive and expectorant component, and an anti-inflammatory and antibacterial component. The smoke-generating agent is at least one selected from propylene glycol, glycerin, erythritol, and sorbitol.

[0005] However, the smoke-generating agent used in the above process is highly hygroscopic, and the heated cigarettes prepared are prone to yellowing after long-term storage. Therefore, establishing a new method of using the smoke-generating agent to better improve the quality of heated cigarettes is an important research direction at present. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide an aerogel for heating cigarettes, its preparation method and application.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides an aerogel for heating cigarettes, wherein the raw materials for preparing the aerogel for heating cigarettes include, by weight, 1-10 parts sodium alginate, 0.5-5 parts xanthan gum, 1-10 parts polyethylene glycol, and 15-25 parts calcium chloride.

[0009] In this invention, xanthan gum and polyethylene glycol exhibit excellent biocompatibility. Sodium alginate is a natural polysaccharide rich in hydroxyl and carboxyl groups. Polyethylene glycol, as a water-soluble polymer, is fully miscible with xanthan gum and sodium alginate. Furthermore, the introduction of calcium salts during preparation increases the porosity and specific surface area of ​​the aerogel, providing more adsorption sites. The resulting network structure not only effectively loads materials such as smoke generators but also captures particles larger than its micropores during flue gas flow. Additionally, the calcium salts... 2+ The strong affinity between sodium alginate and the N-NO groups of negatively charged nitrosamines also promotes the reduction of nitrosamine release from flue gas. Meanwhile, sodium alginate, xanthan gum, polyethylene glycol, and calcium chloride are all green, environmentally friendly, and relatively inexpensive raw materials, which can effectively reduce industrial production costs.

[0010] The amount of sodium alginate added in the raw materials for preparing the heated cigarette aerogel of the present invention can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, etc.

[0011] The amount of xanthan gum added can be 0.8 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, or 4.5 parts, etc.;

[0012] The amount of polyethylene glycol added can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, or 9 parts, etc.

[0013] The amount of calcium chloride added can be 16, 17, 18, 19, 20, 21, 22, 23, or 24 parts, etc.

[0014] Preferably, the polyethylene glycol includes any one or a combination of at least two of polyethylene glycol 6000, polyethylene glycol 8000, or polyethylene glycol 10000.

[0015] Preferably, the polyethylene glycol is polyethylene glycol 6000.

[0016] Preferably, the raw materials for preparing the heated cigarette aerogel include, by weight, 3-8 parts sodium alginate, 1-3 parts xanthan gum, 3-10 parts polyethylene glycol 6000, and 15-20 parts calcium chloride.

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

[0018] Secondly, the present invention provides a method for preparing a heated cigarette aerogel as described in the first aspect, the method comprising:

[0019] (1) Alginate, xanthan gum and polyethylene glycol are mixed in deionized water and then subjected to ultrasonic treatment to obtain mixture A;

[0020] Solution B is obtained by dissolving calcium chloride in water;

[0021] (2) Mix the mixture A and solution B, then let it stand for aging, freeze at ultra-low temperature and then vacuum dry to obtain the aerogel for heating cigarettes.

[0022] Preferably, the ratio of alginate to deionized water in step (1) is 1:(150-300)g / mL, for example, it can be 1:160g / mL, 1:180g / mL, 1:200g / mL, 1:220g / mL, 1:240g / mL, 1:260g / mL or 1:280g / mL, etc.

[0023] Preferably, the ratio of calcium chloride to deionized water in step (1) is 1:(40-60)g / mL, for example, it can be 1:42g / mL, 1:45g / mL, 1:48g / mL, 1:50g / mL, 1:52g / mL, 1:55g / mL or 1:58g / mL, etc.

[0024] Preferably, the mixing in step (1) is carried out by stirring, and the stirring speed is 300-500 r / min, for example, it can be 320 r / min, 340 r / min, 360 r / min, 380 r / min, 400 r / min, 420 r / min, 440 r / min, 460 r / min or 480 r / min, etc.

[0025] Preferably, the mixing temperature in step (1) is 50-70°C, for example, it can be 52°C, 54°C, 56°C, 58°C, 60°C, 62°C, 64°C, 66°C or 68°C.

[0026] Preferably, the temperature during static aging in step (2) is -10 to -5℃ and the time is 0.5-1.5h. For example, the temperature can be -9℃, -8℃, -7℃ or -6℃, and the time can be 0.6h, 0.7h, 0.8h, 0.9h, 1h, 1.1h, 1.2h, 1.3h or 1.4h.

[0027] Preferably, the ultra-low temperature freezing temperature is -85 to -75°C, and the time is 1-3 hours. For example, the temperature can be -84°C, -82°C, -80°C, -78°C, or -76°C, and the time can be 1.2 hours, 1.5 hours, 1.8 hours, 2 hours, 2.2 hours, 2.5 hours, or 2.8 hours.

[0028] Preferably, the vacuum drying method in step (2) is vacuum freeze drying;

[0029] Preferably, the vacuum degree during vacuum freeze drying is 0-30 Pa, for example, it can be 5 Pa, 10 Pa, 15 Pa, 20 Pa or 25 Pa.

[0030] Preferably, the vacuum freeze-drying process is carried out at a temperature of -10 to 0°C for 20 to 30 hours. For example, the temperature can be -9°C, -7°C, -5°C, -3°C, or -1°C, and the time can be 21 hours, 23 hours, 25 hours, 27 hours, or 29 hours.

[0031] Other specific point values ​​within the range of the above values ​​can be selected, and will not be elaborated on here.

[0032] Thirdly, the present invention provides the application of the aerogel for heated cigarettes as described in the first aspect in the preparation of heated cigarettes.

[0033] Using a smoke-generating agent in heated cigarettes can simulate the "smoke-generating" effect of traditional cigarettes. However, if the amount used is too low, the "smoke-generating" effect of heated cigarettes is poor, which affects the consumer's experience. If the amount used is too high, it can easily increase the hygroscopicity of heated cigarettes, which will affect the appearance quality and make them difficult to store. The aerogel for heated cigarettes of the present invention can reduce the amount of smoke-generating agent used when used in heated cigarettes without reducing the amount of smoke generated, and it also has a significant adsorption effect on ammonia, a harmful substance in the smoke.

[0034] Preferably, the method of application includes mixing the smoke-generating agent with aerogel for heated cigarettes, coating it onto tobacco sheets, cutting it into shreds, and then inserting it into heated cigarette segments.

[0035] Preferably, the mass ratio of the smoke-generating agent to the heated cigarette aerogel is 1:(5-10), for example, it can be 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, 1:9 or 1:9.5, etc.

[0036] Preferably, the smoke-generating agent comprises any one or a combination of at least two of glycerol, propylene glycol, 1,2-propanediol or 1,3-butanediol.

[0037] Preferably, the mixture is dissolved in an aqueous ethanol solution after mixing.

[0038] Preferably, the concentration of the ethanol aqueous solution is 50-60%, for example, it can be 51%, 53%, 55%, 57% or 59%, etc.

[0039] Preferably, the solid-liquid ratio of the mixture to the aqueous ethanol solution is 1:(10-20)g / mL, for example, it can be 1:11g / mL, 1:12g / mL, 1:13g / mL, 1:14g / mL, 1:15g / mL, 1:16g / mL, 1:17g / mL, 1:18g / mL or 1:19g / mL, etc.

[0040] Preferably, the mixture accounts for 15-20% of the total amount of tobacco sheets, for example, it can be 15%, 16%, 17%, 18%, 19% or 20%, etc.

[0041] Preferably, after coating, the tobacco sheet is left to stand until the ethanol evaporates before being shredded.

[0042] Other specific point values ​​within the range of the above values ​​can be selected, and will not be elaborated on here.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) In this invention, xanthan gum and polyethylene glycol exhibit excellent biocompatibility. Sodium alginate is a natural polysaccharide, and alginate is rich in hydroxyl and carboxyl groups, both of which can react with Ca. 2+ Cross-linking forms a network, and the network structure formed by the combination of these four components can not only effectively support materials such as smoke generators, but also capture particles larger than its micropores during flue gas flow. Additionally, Ca... 2+ The strong affinity between sodium alginate and the N-NO groups of negatively charged nitrosamines also promotes the reduction of nitrosamine release from flue gas. Meanwhile, sodium alginate, xanthan gum, polyethylene glycol, and calcium chloride are all green, environmentally friendly, and relatively inexpensive raw materials, which can effectively reduce industrial production costs.

[0045] (2) The preparation method of the polymer aerogel for tobacco involved in this invention is simple and easy to operate, and is very suitable for industrial application. Detailed Implementation

[0046] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0047] All raw materials used in the embodiments of this invention can be purchased commercially and used.

[0048] Example 1

[0049] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0050] (1) Add 100 mL of deionized water, 0.5 g of sodium alginate, 0.1 g of xanthan gum and 0.5 g of PEG6000 to a beaker at the same time. Stir at 500 r / min at 60 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0051] Dissolve 2g of calcium chloride in 100mL of deionized water to obtain solution B;

[0052] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -8℃ for 1 hour. Then transfer it to an ultra-low temperature freezer at -80℃ for 2 hours and take it out. After vacuum freeze drying at 15Pa and -5℃ for 24 hours, the aerogel for heated cigarettes is obtained.

[0053] Example 2

[0054] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0055] (1) Add 120 mL of deionized water, 0.8 g of sodium alginate, 0.3 g of xanthan gum and 0.3 g of PEG6000 to a beaker at the same time. Stir at 400 r / min at 50 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0056] Dissolve 1.8g of calcium chloride in 108mL of water to obtain solution B;

[0057] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -5℃ for 1.5h. Then transfer it to an ultra-low temperature freezer at -85℃ for 1h and take it out. After vacuum freeze drying at 10Pa and 0℃ for 30h, the aerogel for heated cigarettes is obtained.

[0058] Example 3

[0059] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0060] (1) Add 90 mL of deionized water, 0.3 g of sodium alginate, 0.2 g of xanthan gum and 1 g of PEG6000 to a beaker at the same time. Stir at 300 r / min at 70 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0061] Dissolve 2g of calcium chloride in 110mL of water to obtain solution B;

[0062] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -10℃ for 0.8h. Then transfer it to an ultra-low temperature freezer at -75℃ for 3h and take it out. After vacuum freeze drying at 25Pa and -10℃ for 20h, the aerogel for heated cigarettes is obtained.

[0063] Example 4

[0064] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0065] (1) Add 200mL of deionized water, 0.5g of sodium alginate, 0.1g of xanthan gum, 0.5g of PEG6000 and 2g of calcium chloride to a beaker at the same time. Stir at 500r / min at 60℃ until completely dissolved. After ultrasonic treatment to remove air bubbles, a mixture is obtained.

[0066] (2) The mixture was transferred to a 24-well plate and aged at -8°C for 1 hour. Then it was transferred to an ultra-low temperature freezer at -80°C for 2 hours and then taken out. After vacuum freeze drying at 15Pa and -5°C for 24 hours, the aerogel for heated cigarettes was obtained.

[0067] Example 5

[0068] This embodiment provides an aerogel for heated cigarettes. The preparation method of the aerogel for heated cigarettes differs from that of Embodiment 1 only in that the temperature of the ultra-low temperature freezing treatment in step (2) is -50°C and the time is 4 hours. The remaining steps are the same as those in Embodiment 1.

[0069] Example 6

[0070] This embodiment provides an aerogel for heating cigarettes. The preparation method of the aerogel for heating cigarettes is different from that of Embodiment 1 only in that the temperature of the ultra-low temperature freezing treatment in step (2) is -100℃ and the time is 4h. The remaining steps are the same as those in Embodiment 1.

[0071] Example 7

[0072] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0073] (1) Add 100 mL of deionized water, 0.1 g of sodium alginate, 0.5 g of xanthan gum and 1.1 g of PEG6000 to a beaker at the same time. Stir at 500 r / min at 60 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0074] Dissolve 3g of calcium chloride in 150mL of deionized water to obtain solution B;

[0075] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -8℃ for 1 hour. Then transfer it to an ultra-low temperature freezer at -80℃ for 2 hours and take it out. After vacuum freeze drying at 15Pa and -5℃ for 24 hours, the aerogel for heated cigarettes is obtained.

[0076] Example 8

[0077] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0078] (1) Add 300mL of deionized water, 1.5g of sodium alginate, 0.6g of xanthan gum and 0.1g of PEG6000 to a beaker at the same time, stir at 500r / min at 60℃ until completely dissolved, and then remove the air bubbles by ultrasonic treatment to obtain mixture A;

[0079] Dissolve 1g of calcium chloride in 50mL of deionized water to obtain solution B;

[0080] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -8℃ for 1 hour. Then transfer it to an ultra-low temperature freezer at -80℃ for 2 hours and take it out. After vacuum freeze drying at 15Pa and -5℃ for 24 hours, the aerogel for heated cigarettes is obtained.

[0081] Comparative Example 1

[0082] This comparative example provides an aerogel for heated cigarettes, and the preparation method of the aerogel for heated cigarettes is as follows:

[0083] (1) Add 100 mL of deionized water, 0.5 g of sodium alginate, 0.1 g of xanthan gum and 0.5 g of PEG6000 to a beaker at the same time. Stir at 500 r / min at 60 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0084] (2) The mixture A was transferred to a 24-well plate and aged at -8°C for 1 hour. Then it was transferred to an ultra-low temperature freezer at -80°C for 2 hours and then taken out. After vacuum freeze drying at 15Pa and -5°C for 24 hours, the aerogel for heated cigarettes was obtained.

[0085] Comparative Example 2

[0086] This comparative example provides an aerogel for heated cigarettes, and the preparation method of the aerogel for heated cigarettes is as follows:

[0087] (1) Add 100 mL of deionized water, 0.5 g of sodium alginate and 0.6 g of PEG6000 to a beaker at the same time, stir at 500 r / min at 60 °C until completely dissolved, and then remove the bubbles by ultrasonic treatment to obtain mixture A;

[0088] Dissolve 2g of calcium chloride in 100mL of deionized water to obtain solution B;

[0089] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -8℃ for 1 hour. Then transfer it to an ultra-low temperature freezer at -80℃ for 2 hours and take it out. After vacuum freeze drying at 15Pa and -5℃ for 24 hours, the aerogel for heated cigarettes is obtained.

[0090] Comparative Example 3

[0091] This comparative example provides an aerogel for heated cigarettes, and the preparation method of the aerogel for heated cigarettes is as follows:

[0092] (1) Add 100 mL of deionized water, 0.5 g of sodium alginate and 0.6 g of xanthan gum to a beaker at the same time, stir at 500 r / min at 60 °C until completely dissolved, and then remove the air bubbles by ultrasonic treatment to obtain mixture A;

[0093] Dissolve 2g of calcium chloride in 100mL of deionized water to obtain solution B;

[0094] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -8℃ for 1 hour. Then transfer it to an ultra-low temperature freezer at -80℃ for 2 hours and take it out. After vacuum freeze drying at 15Pa and -5℃ for 24 hours, the aerogel for heated cigarettes is obtained.

[0095] Comparative Example 4

[0096] This comparative example provides an aerogel for heated cigarettes, and the preparation method of the aerogel for heated cigarettes is as follows:

[0097] (1) Add 100 mL of deionized water, 0.5 g of sodium alginate, 0.1 g of xanthan gum and 0.5 g of PEG6000 to a beaker at the same time. Stir at 500 r / min at 60 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0098] Dissolve 2g of calcium chloride in 100mL of deionized water to obtain solution B;

[0099] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and let it stand at -8°C for 1 hour. After vacuum freeze drying at 15Pa and -5°C for 24 hours, the aerogel for heated cigarettes is obtained.

[0100] Comparative Example 5

[0101] This embodiment provides an aerogel for heating cigarettes, and the preparation method of the aerogel for heating cigarettes is as follows:

[0102] (1) Add 100 mL of deionized water, 0.5 g of sodium alginate, 0.1 g of xanthan gum and 0.5 g of PEG6000 to a beaker at the same time. Stir at 500 r / min at 60 °C until completely dissolved. After ultrasonic treatment to remove air bubbles, obtain mixture A.

[0103] Dissolve 2g of calcium chloride in 100mL of deionized water to obtain solution B;

[0104] (2) Slowly add solution B to mixture A. After a colorless and transparent gel is formed, transfer it to a 24-well plate and freeze it in an ultra-low temperature freezer at -80℃ for 2 hours. After freezing, remove it and freeze-dry it under vacuum at 15Pa and -5℃ for 24 hours to obtain aerogel for heated cigarettes.

[0105] Application Example 1

[0106] This application example provides a heated cigarette, the method for preparing the heated cigarette is as follows:

[0107] (1) Mix propylene glycol with the heated cigarette aerogel obtained in Example 1 at a mass ratio of 1:8 to obtain a mixture;

[0108] (2) The mixture from step (1) is mixed and dissolved with a 50% ethanol aqueous solution at a solid-liquid ratio of 1:15 g / mL, and then evenly coated onto tobacco sheets (the tobacco sheets are 5 times the mass of the mixture), cut into shreds and loaded into heated cigarette segments to obtain the final product.

[0109] Application Example 2-8

[0110] Application Examples 2-8 provide seven types of heated cigarettes. The only difference between these heated cigarettes and Application Example 1 is that the heated cigarette aerogel obtained in Example 1 is replaced in equal amounts with the heated cigarette aerogel obtained in Examples 2-8. The rest of the methods are consistent with Application Example 1.

[0111] Application Example 9-12

[0112] Application Examples 9-12 provide four types of heated cigarettes. The only difference between these heated cigarettes and Application Example 1 is that in step (1), the mass ratio of propylene glycol to the tobacco polymer aerogel obtained in Example 1 is 1:5, 1:10, 1:1, and 1:15, respectively. The rest of the methods are the same as in Application Example 1.

[0113] Compare and contrast examples 1-5

[0114] Comparative Application Examples 1-5 provide five types of heated cigarettes. The only difference between these heated cigarettes and Application Example 1 is that the heated cigarette aerogel obtained in Example 1 is replaced in equal amounts with the heated cigarette aerogel obtained in Comparative Examples 1-5. The rest of the methods are consistent with Application Example 1.

[0115] Comparative Application Example 6

[0116] This comparative application example provides a heated cigarette, the preparation method of which is as follows:

[0117] Propylene glycol is mixed and dissolved with a 50% aqueous ethanol solution at a solid-liquid ratio of 1:15 g / mL, and then evenly coated onto tobacco sheets (the tobacco sheets being 5 times the mass of propylene glycol). After being shredded, the mixture is inserted into heated cigarette segments to obtain the final product.

[0118] Comparative Application Example 7

[0119] This comparative application example provides a heated cigarette, the preparation method of which is as follows:

[0120] Propylene glycol is mixed and dissolved with a 50% aqueous ethanol solution at a solid-liquid ratio of 1:15 g / mL, and then evenly coated onto tobacco sheets (the tobacco sheets being 7 times the mass of propylene glycol). After being shredded, the mixture is inserted into heated cigarette segments to obtain the final product.

[0121] Comparative Application Example 8

[0122] This comparative application example provides a heated cigarette, the preparation method of which is as follows:

[0123] Propylene glycol is mixed and dissolved with a 50% aqueous ethanol solution at a solid-liquid ratio of 1:15 g / mL, and then evenly coated onto tobacco sheets (the tobacco sheets being 10 times the mass of propylene glycol). After being shredded, the mixture is inserted into heated cigarette segments to obtain the final product.

[0124] Test Example 1

[0125] (1) The heated cigarettes according to Application Examples 1-12 and Comparative Application Examples 1-8 were stored in a constant temperature and humidity chamber at a designed temperature of 25°C and a humidity of 80%rH for 60 days. The appearance was then observed and the standards were as follows:

[0126] Grade A: No yellow spots; Grade B: Spots present; Grade C: Patchy yellow spots present; Grade D: Large yellow spots.

[0127] (2) The content of NNK (4-(methylnitrosamine)-1-(3-pyridyl)-1-butanone) in cigarettes was determined according to the "Determination of Tobacco-specific N-nitrosamines in Tobacco and Tobacco Products by High Performance Liquid Chromatography-Tandem Mass Spectrometry".

[0128] (3) The heated cigarettes used in Application Examples 1-12 and Comparative Application Examples 1-8 were smoked. In accordance with the national standard "Sensory Technical Requirements for Cigarettes" (GB5606.4-2005), seven sensory evaluators were organized to conduct sensory evaluations of the heated cigarettes, mainly examining the amount of smoke exhaled from the heated cigarettes under a fixed ambient wind. The above indicators were scored, with the amount of smoke exhaled under ambient wind ranging from 0 to 10 points. The higher the score, the better the feeling or the higher the acceptance of the evaluation indicator during the smoking process.

[0129] The test results are shown in Table 1 below.

[0130] Table 1

[0131]

[0132]

[0133] As can be seen from the data in Table 1, compared with comparative application examples 6-8, the aerogel for heated cigarettes of the present invention can reduce the amount of smoke-generating agent used without reducing the sensory experience of heated cigarettes. The reduction in the amount of smoke-generating agent can significantly reduce the hygroscopicity of heated cigarettes. Furthermore, the ammonia content in heated cigarette smoke is also significantly reduced after adding the aerogel for heated cigarettes of the present invention.

[0134] The applicant declares that this invention illustrates a heated cigarette aerogel, 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.

[0135] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in 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.

[0136] 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 method for producing an aerogel for heating a cigarette, characterized by, The preparation method of the aerogel for the heated cigarette comprises: (1) mixing sodium alginate, xanthan gum and polyethylene glycol in deionized water, and then performing ultrasonic treatment to obtain a mixed solution A; calcium chloride is dissolved in water to obtain a solution B; (2) mixing the mixed solution A and the solution B, and then performing aging by standing, vacuum drying after ultra-low temperature freezing to obtain the aerogel for the heated cigarette; In step (1), the ratio of sodium alginate to deionized water is 1: (150-300) g / mL; In step (1), the ratio of calcium chloride to deionized water is 1: (40-60) g / mL; In step (2), the temperature during the standing and aging is -10 to -5℃, and the time is 0.5-1.5h; The temperature of the ultra-low temperature freezing is -85 to -75℃, and the time is 1-3h; The preparation raw materials of the aerogel for the heated cigarette comprise, by weight fraction, 1-10 parts of sodium alginate, 0.5-5 parts of xanthan gum, 1-10 parts of polyethylene glycol, and 15-25 parts of calcium chloride.

2. The method for preparing heated cigarette aerogel as described in claim 1, characterized in that, The polyethylene glycol comprises any one or a combination of at least two of polyethylene glycol 6000, polyethylene glycol 8000 or polyethylene glycol 10000.

3. The method of claim 2, wherein the heating cigarette with the aerogel is prepared by the steps of: The polyethylene glycol is polyethylene glycol 6000. ​ 4. The method for preparing heated cigarette aerogel as described in claim 1, characterized in that, The preparation raw materials of the aerogel for the heated cigarette comprise, by weight fraction, 3-8 parts of sodium alginate, 1-3 parts of xanthan gum, 3-10 parts of polyethylene glycol 6000, and 15-20 parts of calcium chloride.

5. The method for preparing heated cigarette aerogel as described in claim 1, characterized in that, In step (1), the mixing is performed in a stirring manner, and the stirring speed is 300-500 r / min.

6. The method of claim 1, wherein the heating cigarette with the aerogel is prepared by the steps of: In step (1), the temperature during the mixing is 50-70℃.

7. The method for preparing heated cigarette aerogel as described in claim 1, characterized in that, In step (2), the vacuum drying is performed by vacuum freeze drying.

8. The preparation method of the aerogel for the heated cigarette according to claim 7, wherein the vacuum degree during the vacuum freeze drying is 5-30 Pa.

9. The preparation method of the aerogel for the heated cigarette according to claim 7, wherein the temperature during the vacuum freeze drying is -10 to -1℃, and the time is 20-30h.

10. The application of the aerogel for the heated cigarette obtained by the preparation method according to any one of claims 1-9 in the preparation of the heated cigarette, wherein the application method comprises mixing a smoking agent with the aerogel for the heated cigarette, coating the mixture in tobacco sheet, and cutting the tobacco sheet into shreds to obtain the heated cigarette; The mass ratio of the smoking agent to the aerogel for the heated cigarette is 1: (5-10).

11. Use according to claim 10, wherein the compound is ###0002### The smoking agent comprises any one or a combination of at least two of glycerol, propylene glycol, 1,2-propanediol or 1,3-butanediol.

12. The use according to claim 10, wherein the compound is ###0002### After the mixing, the mixture is dissolved in an ethanol aqueous solution.

13. The use according to claim 12, wherein the compound is ###0002### The concentration of the ethanol aqueous solution is 50-60%, and the solid-liquid ratio is 1: (10-20) g / mL.

14. The use according to claim 12, wherein the compound is ###0002### The mixture accounts for 15-20% of the total amount of the tobacco sheet.

15. The use according to claim 10, wherein the compound is ###00010### 10 After the coating, the tobacco sheet is allowed to stand, and the ethanol is allowed to evaporate before the tobacco sheet is cut into shreds.

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