A polymer aerogel for cigarettes and a method for preparing and using the same

Abstract

The present application relates to a kind of polymer aerogel for cigarette and its preparation method and application, the raw material of the polymer aerogel for cigarette includes nanocellulose 5-25 parts and polyethylene glycol 1-5 parts by weight fraction.The nanocellulose and polyethylene glycol of the present application both have biocompatibility, and nanocellulose has larger specific surface area, higher Young's modulus, super strong adsorption capacity, and the aerogel obtained by the cooperation of both can be well loaded in heating cigarette Material such as smoking agent, not only can reduce the addition amount of smoking agent in tobacco sheet while reducing the amount of smoke, and the material has obvious adsorption effect on harmful substance ammonia in smoke.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heated cigarettes, and particularly relates to a polymer aerogel for cigarettes, a preparation method and application thereof. BACKGROUND

[0002] As a new type of tobacco product with a good development momentum, heated cigarettes have the characteristic of heating tobacco instead of burning tobacco. Most of the tobacco materials of heated cigarettes are in the form of tobacco sheet (reconstituted tobacco leaf). The production process of tobacco sheet requires the application of a certain proportion of smoking agent, which plays the role of simulating the "smoke" effect of traditional cigarettes.

[0003] CN115226927A discloses a core material for heated cigarettes, a preparation method of the core material and heated cigarettes. The core material is prepared by mixing bamboo fibers obtained by enzymatic hydrolysis and wire twisting treatment of bamboo materials with smoking agents and aroma-producing agents. The smoking agents are one or more of glycerol, modified glycerol and new-type smoking agents. The aroma-producing agents are one or more than one of tobacco extract, natural plant extract and artificial synthetic flavor. The bamboo fibers prepared by the method can reduce the woody odor of the core material under heating conditions. The bamboo fibers treated by biological and mechanical coupling have a fluffy structure and better adsorption and loading capacity, can load more smoking agents and aroma-producing agents, and can effectively improve the sensory quality of smoke.

[0004] CN113633011A discloses a preparation method of granular heated cigarettes. The tobacco granules used in heated cigarettes mainly consist of tobacco powder and smoking agents. The tobacco granules added to heated cigarettes during smoking can cause dry throat, irritation and other adverse effects. The present application innovatively uses a water-soluble organic acid salt as a humectant and 1,2-propanediol and glycerol as smoking agents to prepare heated cigarette tobacco granules. The heated temperature of the heated cigarettes is below 400℃. Depending on the heating temperature of the smoking set, water is released at a specific temperature to achieve fine control of water release.

[0005] However, although the addition of smoking agents in the above heated cigarettes increases the amount of smoke, the high hygroscopicity of the smoking agents used makes the heated cigarettes prone to moisture, affecting the appearance quality of the heated cigarettes and the matching of the cigarettes and the smoking set. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a polymer aerogel for cigarettes, a preparation method and application thereof.

[0007] To achieve the object of the present application, the present application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a polymer aerogel for cigarettes, the raw materials for preparing the polymer aerogel for cigarettes include nanocellulose 5-25 parts by weight and polyethylene glycol 1-5 parts by weight.

[0009] In the present application, the nanocellulose and the polyethylene glycol both have biocompatibility, and the nanocellulose has a larger specific surface area, a higher Young's modulus and super strong adsorption capacity. The aerogel obtained by cooperation of the two can well load the materials such as smoking agents in heated cigarettes. Not only can the amount of smoking agents in the tobacco sheet be reduced while the amount of smoke is not reduced, but also the material has obvious adsorption effect on harmful substances such as ammonia in the smoke.

[0010] The amount of the nanocellulose in the polymer aerogel for cigarettes of the present application can be 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts or 24 parts, etc.

[0011] The amount of the polyethylene glycol can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.

[0012] 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.

[0013] Preferably, the nanocellulose is modified nanocellulose.

[0014] Preferably, the modified nanocellulose is obtained by pretreating lignocellulose with a deep eutectic solvent.

[0015] In the present application, the deep eutectic solvent (DES) has the advantages of wide liquid temperature range, low vapor pressure, good chemical and thermal stability, strong solubility, etc. It can easily penetrate into the fiber bundle, swell the cellulose, increase the specific surface area of the cellulose, make the choline chloride more easily contact the exposed hydroxyl group, and react with the hydroxyl group to introduce cationic charges on the surface of the cellulose. The cationic charges can react with ammonia to effectively adsorb ammonia in the smoke. In addition, the hydroxyl group and the carbonyl group in the deep eutectic solvent can form hydrogen bonds with ammonia, thereby playing a certain role in the adsorption of ammonia in the smoke.

[0016] In the present application, the lignocellulose is modified by the deep eutectic solvent. The modified cellulose has a higher nanometerization degree and good dispersion stability. In addition, carboxyl groups are introduced on the surface of the fiber through esterification during the treatment process, and then the crosslinking reaction with the polyethylene glycol is better.

[0017] Preferably, the lignocellulose comprises tobacco cellulose.

[0018] In the present application, the lignocellulose uses tobacco cellulose, and the raw material is tobacco stem waste, which greatly saves the amount of tobacco leaf and reduces the tar content in the cigarette product. While maintaining the internal quality of the cigarette product and the comfort during smoking, it promotes the overall product structure of the tobacco industry to be more healthy and cleaner, fully recycles the waste generated in the cigarette processing process, and is conducive to the comprehensive utilization of tobacco fibers, creating high-value products. In the actual production process, the advantages of strong plasticity of tobacco fibers can also be fully utilized by improving the processing technology of tobacco fibers, improving the quality of tobacco products, and exploring the application of tobacco fiber raw materials in more fields. It has become an inevitable measure to promote the comprehensive utilization of tobacco resources and improve economic benefits.

[0019] In the present application, the tobacco cellulose uses tobacco stem waste recovered during cigarette processing as a fiber raw material, and extracts tobacco fibers by a chemical method: pretreatment → alkali treatment → stewing → washing and bleaching → acid washing. The method steps are simple, and the cost of raw materials is very low.

[0020] Preferably, the raw materials for preparing the deep eutectic solvent include choline chloride and oxalic acid.

[0021] Preferably, the preparation method of the deep eutectic solvent comprises stirring and reacting choline chloride and oxalic acid, and the reaction is completed when the system is transparent.

[0022] Preferably, the molar ratio of choline chloride to oxalic acid is 1:(0.5-1.5), for example, it can be 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3 or 1:1.4, etc.

[0023] Preferably, the temperature of the reaction is 85-95℃, for example, it can be 86℃, 88℃, 90℃, 92℃ or 94℃, etc.

[0024] Preferably, the preparation method of the modified nanocellulose comprises adding lignocellulose to a deep eutectic solvent, stirring and reacting, cooling after the reaction is completed, and then filtering and washing to obtain the product.

[0025] Preferably, the solid-liquid ratio of the lignocellulose to the deep eutectic solvent is 1:(10-40) g / mL, for example, it can be 1:12 g / mL, 1:15 g / mL, 1:18 g / mL, 1:20 g / mL, 1:22 g / mL, 1:25 g / mL, 1:28 g / mL, 1:30 g / mL, 1:32 g / mL, 1:35 g / mL or 1:38 g / mL, etc.

[0026] Preferably, the temperature of the reaction is 95-110℃, for example, it can be 96℃, 98℃, 100℃, 102℃, 104℃, 106℃ or 108℃, etc.

[0027] Preferably, the time of the reaction is 1.5-3h, for example, it can be 1.6h, 1.8h, 2h, 2.2h, 2.4h, 2.6h or 2.8h, etc.

[0028] Preferably, the temperature of the cooling is 25-30℃, for example, it can be 25℃, 26℃, 27℃, 28℃, 29℃ or 30℃, etc.

[0029] Preferably, the pH of the washing is 6-7, for example, it can be 6.1, 6.3, 6.5, 6.7 or 6.9, etc.

[0030] Other specific point values within the above-mentioned numerical ranges can also be selected, which will not be repeated here.

[0031] In the second aspect, the application provides a preparation method of the polymer aerogel for cigarettes as described in the first aspect, which comprises stirring nanocellulose and polyethylene glycol to react, and then dialyzing the product in an ethanol aqueous solution after the reaction is completed, and obtaining the product after freezing and drying.

[0032] Preferably, the temperature of the reaction is 140℃-160℃, for example, it can be 142℃, 144℃, 146℃, 148℃, 150℃, 152℃, 154℃, 156℃ or 158℃, etc.

[0033] Preferably, the reaction is carried out under reflux condensation of inert gas.

[0034] Preferably, the inert gas is nitrogen.

[0035] Preferably, the time of the reflux condensation is 8-15h, for example, it can be 9h, 10h, 11h, 12h, 13h or 14h, etc.

[0036] Preferably, the concentration of the ethanol aqueous solution is 5-15%, for example, it can be 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13% or 14%, etc.

[0037] Preferably, the dialysis time is 24-72h, for example, it can be 30h, 36h, 42h, 48h, 54h, 60h or 66h, etc.

[0038] Preferably, the temperature of the freezing is -10-0℃, for example, it can be -9℃, -8℃, -7℃, -6℃, -5℃, -4℃, -3℃, -2℃ or -1℃, etc.

[0039] Preferably, the drying is vacuum freeze-drying.

[0040] In a third aspect, the present application provides a use of the polymer aerogel for cigarettes in preparing a heat-not-burn cigarette.

[0041] The use of a smoking agent in a heat-not-burn cigarette can simulate the effect of traditional cigarette "smoking", but when the amount of the smoking agent is too low, the "smoking" effect of the heat-not-burn cigarette is poor, thereby affecting the experience of consumers, and when the amount of the smoking agent is too high, the hygroscopicity of the heat-not-burn cigarette is easily enhanced, thereby affecting the appearance quality and being not easy to store. After the polymer aerogel for cigarettes is used in a heat-not-burn cigarette, the amount of the smoking agent can be reduced without reducing the amount of smoke of the heat-not-burn cigarette, and the polymer aerogel for cigarettes has a significant adsorption effect on harmful substances such as ammonia in smoke.

[0042] Preferably, the method of use comprises mixing the smoking agent with the polymer aerogel for cigarettes, coating in the tobacco sheet, and cutting and loading into a heat-not-burn cigarette after cutting.

[0043] Preferably, the mass ratio of the smoking agent to the polymer aerogel for cigarettes is 1:(3-5), for example, 1:3.2, 1:3.5, 1:3.8, 1:4, 1:4.2, 1:4.5, or 1:4.8, etc.

[0044] Preferably, the smoking agent comprises any one or a combination of at least two of glycerol, 1,2-propanediol, or 1,3-butanediol.

[0045] Preferably, the mixture is dissolved in an ethanol aqueous solution after mixing.

[0046] Preferably, the concentration of the ethanol aqueous solution is 50-60%, for example, 51%, 53%, 55%, 57%, or 59%, etc.

[0047] Preferably, the solid-liquid ratio of the mixture to the ethanol aqueous solution is 1:(10-20) g / mL, for example, 1:11 g / mL, 1:12 g / mL, 1:13 g / mL, 1:14 g / mL, 1:15 g / mL, 1:16 g / mL, 1:17 g / mL, 1:18 g / mL, or 1:19 g / mL, etc.

[0048] Preferably, the mixture accounts for 15-20% of the total amount of the tobacco sheet, for example, 15%, 16%, 17%, 18%, 19%, or 20%, etc.

[0049] Preferably, the tobacco sheet is placed after coating, and the tobacco sheet is cut after the ethanol is volatilized.

[0050] Other specific point values within the above numerical ranges can be selected, which will not be described here one by one.

[0051] Compared with the prior art, the present application has the following beneficial effects:

[0052] (1) In the present application, both the nanocellulose and the polyethylene glycol have biocompatibility, and the nanocellulose has a large specific surface area, a high Young's modulus and super strong adsorption capacity. The aerogel obtained by combining the two can well load the smoking agent and other materials in heated cigarettes. Not only can the amount of the smoking agent in the tobacco sheet be reduced without reducing the amount of smoke, but the material also has a significant adsorption effect on harmful substances such as ammonia in the smoke.

[0053] (2) The preparation method of the polymer aerogel for cigarettes according to the present application is simple and easy to operate, and is very suitable for industrial application. DETAILED DESCRIPTION

[0054] In order to further illustrate the technical means adopted by the present application and its effects, the technical solutions of the present application will be further described below in combination with the preferred embodiments of the present application, but the present application is not limited in the scope of the embodiments.

[0055] The nanocellulose used in the present application is prepared by the following method:

[0056] (1) The discarded tobacco stems are used as raw materials for hot water extraction at 70℃, and the filtrate is removed after filtration;

[0057] (2) The raw materials treated in step (1) are subjected to a cooking reaction at 100℃ to remove non-fiber components in the tobacco stem fiber raw materials, and the cooked pulp is taken out and cooled;

[0058] (3) Isopropyl alcohol and a cationic etherifying agent (3-chloro-2-hydroxypropyl trimethylammonium chloride, CTA, 50% mass fraction aqueous solution) are added to the pulp, and the mass ratio of the pulp, isopropyl alcohol and cationic etherifying agent is 1:0.2:0.2. Cationization reaction is carried out at 60℃. After the cationization reaction is completed, the tobacco stem pulp is transferred to a beaker and then poured into a Buchner funnel for washing with distilled water until the filtrate is neutral.

[0059] (4) The filtrate is diluted and poured into the feed tank of a high-pressure homogenizer. The tobacco stem fibers are cut off by the strong mechanical shearing action of the high-pressure homogenizer. After multiple cycles, the final sample is collected.

[0060] The raw materials used in the embodiments of the present application can be purchased through commercial channels.

[0061] Example 1

[0062] The present embodiment provides a polymer aerogel for cigarettes, and the preparation method of the polymer aerogel for cigarettes is:

[0063] (1) Choline chloride and oxalic acid with a molar ratio of 1:1 were reacted at 90°C until the system became transparent to obtain a deep eutectic solvent;

[0064] (2) The nanocellulose and the deep eutectic solvent were mixed in a ratio of 1:20 g / mL by stirring, and the temperature was raised to 100°C for 2 h of reaction. After the reaction was completed, the reaction mixture was cooled to 25°C, then filtered, and washed with deionized water until the pH was 6.5 (±0.3) to obtain the modified nanocellulose;

[0065] (3) 20 parts of the modified nanocellulose of step (2) and 4 parts of polyethylene glycol 6000 were placed in a three-necked flask, stirred with a heat collecting constant temperature heating magnetic stirrer, refluxed and condensed under nitrogen protection at a temperature of 150°C for 10 h. After the reaction was completed, the product was dialyzed in 10% ethanol aqueous solution for 48 h, then frozen at -10°C for 8 h, and finally vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0066] Example 2

[0067] This example provides a polymer aerogel for cigarettes, and a preparation method thereof is as follows:

[0068] (1) Choline chloride and oxalic acid with a molar ratio of 1:0.8 were reacted at 95°C until the system became transparent to obtain a deep eutectic solvent;

[0069] (2) The nanocellulose and the deep eutectic solvent were mixed in a ratio of 1:35 g / mL by stirring, and the temperature was raised to 90°C for 3 h of reaction. After the reaction was completed, the reaction mixture was cooled to 28°C, then filtered, and washed with deionized water until the pH was 6.5 (±0.3) to obtain the modified nanocellulose;

[0070] (3) 18 parts of the modified nanocellulose of step (2) and 6 parts of polyethylene glycol 6000 were placed in a three-necked flask, stirred with a heat collecting constant temperature heating magnetic stirrer, refluxed and condensed under nitrogen protection at a temperature of 140°C for 12 h. After the reaction was completed, the product was dialyzed in 15% ethanol aqueous solution for 36 h, then frozen at -10°C for 8 h, and finally vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0071] Example 3

[0072] This example provides a polymer aerogel for cigarettes, and a preparation method thereof is as follows:

[0073] (1) Choline chloride and oxalic acid with a molar ratio of 1:1.5 were reacted at 85°C until the system became transparent to obtain a deep eutectic solvent;

[0074] (2) The nanocellulose and the deep eutectic solvent were mixed in a ratio of 1:15 g / mL by stirring, and the temperature was raised to 108°C for 1.5 h of reaction. After the reaction was completed, the reaction mixture was cooled to 30°C, and then filtered, washed with deionized water until the pH was 6.5 (±0.3) to obtain the modified nanocellulose;

[0075] (3) 15 parts of the modified nanocellulose of step (2) and 9 parts of polyethylene glycol 6000 were placed in a three-necked flask, stirred with a heat collecting constant temperature heating magnetic stirrer, refluxed and condensed at a temperature of 160°C under nitrogen protection for 8 h. After the reaction was completed, the product was dialyzed in an 8% ethanol aqueous solution for 60 h, then frozen at -10°C for 8 h, and finally vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0076] Example 4

[0077] The present example provides a polymer aerogel for cigarettes, and the preparation method thereof is as follows: 5 parts of nanocellulose and 1 part of polyethylene glycol 6000 were placed in a three-necked flask, stirred with a heat collecting constant temperature heating magnetic stirrer, refluxed and condensed at a temperature of 150°C under nitrogen protection for 10 h. After the reaction was completed, the product was dialyzed in a 10% ethanol aqueous solution for 48 h, then frozen at -10°C for 8 h, and finally vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0078] Example 5

[0079] The present example provides a polymer aerogel for cigarettes, and the preparation method thereof is different from that of Example 1 only in that the ratio of nanocellulose to deep eutectic solvent in step (2) is 1:50 g / mL, and the other steps are consistent with those of Example 1.

[0080] Example 6

[0081] The present example provides a polymer aerogel for cigarettes, and the preparation method thereof is different from that of Example 1 only in that the ratio of nanocellulose to deep eutectic solvent in step (2) is 1:5 g / mL, and the other steps are consistent with those of Example 1.

[0082] Example 7

[0083] The present example provides a polymer aerogel for cigarettes, and the preparation method thereof is different from that of Example 1 only in that after the nanocellulose and the deep eutectic solvent are mixed, the temperature is raised to 120°C for 2 h of reaction, and the other steps are consistent with those of Example 1.

[0084] Example 8

[0085] The present embodiment provides a polymer aerogel for cigarettes, the preparation method of the polymer aerogel for cigarettes is only different from that of embodiment 1 in that in step (2), the nanocellulose is mixed with the deep eutectic solvent, and then heated to 80℃ for reaction for 2h, and the remaining steps are consistent with those of embodiment 1.

[0086] Embodiment 9

[0087] The present embodiment provides a polymer aerogel for cigarettes, the preparation method of the polymer aerogel for cigarettes is only different from that of embodiment 1 in that in step (3), the modified nanocellulose is 3 parts, and the polyethylene glycol 6000 is 6 parts, and the remaining steps are consistent with those of embodiment 1.

[0088] Embodiment 10

[0089] The present embodiment provides a polymer aerogel for cigarettes, the preparation method of the polymer aerogel for cigarettes is only different from that of embodiment 1 in that in step (3), the modified nanocellulose is 30 parts, and the polyethylene glycol 6000 is 1 part, and the remaining steps are consistent with those of embodiment 1.

[0090] Embodiment 11

[0091] The present embodiment provides a polymer aerogel for cigarettes, the preparation method of the polymer aerogel for cigarettes is only different from that of embodiment 1 in that in step (3) is:

[0092] 5 parts of the modified nanocellulose of step (2) and 1 part of polyethylene glycol 6000 are placed in a three-necked flask, stirred with a heat collecting constant temperature heating magnetic stirrer, reacted at a temperature of 150℃ for 10h, after the reaction is completed, the product is dialyzed in 10% ethanol aqueous solution for 48h, then frozen at-10℃ for 8h, and finally vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0093] Embodiment 12

[0094] The present embodiment provides a polymer aerogel for cigarettes, the preparation method of the polymer aerogel for cigarettes is only different from that of embodiment 1 in that in step (3) is:

[0095] 5 parts of the modified nanocellulose of step (2) and 1 part of polyethylene glycol 6000 are placed in a three-necked flask, stirred with a heat collecting constant temperature heating magnetic stirrer, reacted at a temperature of 150℃, under nitrogen protection, for 10h, after the reaction is completed, the product is dialyzed in 10% ethanol aqueous solution for 48h, then frozen at-10℃ for 8h, and finally vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0096] Embodiment 13

[0097] The present embodiment provides a polymer aerogel for cigarettes, the preparation method of the polymer aerogel for cigarettes is only different from that of embodiment 1 in that in step (3) is:

[0098] 5 parts of the modified nanocellulose of step (2) and 1 part of polyethylene glycol 6000 were placed in a three-necked flask, stirred by a heat collecting constant temperature heating magnetic stirrer, refluxed and condensed under nitrogen protection at a temperature of 150°C for 10 h. After the reaction was completed, the product was dialyzed in 10% ethanol aqueous solution for 48 h, and vacuum freeze-dried to obtain the polymer aerogel for cigarettes.

[0099] Comparative Example 1

[0100] The present comparative example provides a polymer aerogel for cigarettes, and a preparation method thereof is as follows:

[0101] (1) Choline chloride and oxalic acid were reacted at a molar ratio of 1:1 at 90°C until the system became transparent to obtain a deep eutectic solvent;

[0102] (2) Nanocellulose and the deep eutectic solvent were mixed at a solid-liquid ratio of 1:20 g / mL by stirring, and the temperature was raised to 100°C for reaction for 2 h. After the reaction was completed, the reaction mixture was cooled to 25°C, and then filtered and washed with deionized water until neutral to obtain the product.

[0103] Application Example 1

[0104] The present application example provides a heated cigarette, and a preparation method thereof is as follows:

[0105] (1) Glycerol and the polymer aerogel for cigarettes obtained in Example 1 were mixed at a mass ratio of 1:3 to obtain a mixture;

[0106] (2) The mixture of step (1) was mixed with 50% ethanol aqueous solution at a solid-liquid ratio of 1:15 g / mL, and then uniformly coated in tobacco sheet (5 times the mass of the mixture), cut into shreds, and then loaded into a heated cigarette segment to obtain the product.

[0107] Application Examples 2-13

[0108] The present application example provides twelve kinds of heated cigarettes, and the difference between the heated cigarettes and the application example 1 is that the polymer aerogel for cigarettes obtained in Example 1 is replaced by the polymer aerogel for cigarettes obtained in Examples 2-13 in an equal amount in the preparation method, and the rest of the method is consistent with the application example 1.

[0109] Application Examples 14-17

[0110] The present application example provides four kinds of heated cigarettes, and the difference between the heated cigarettes and the application example 1 is that the mass ratio of glycerol to the polymer aerogel for cigarettes obtained in Example 1 in step (1) is 1:3, 1:5, 1:1 and 1:6 respectively, and the rest of the method is consistent with the application example 1.

[0111] Comparative Application Example 1

[0112] This comparative application example provides a heat-not-burn cigarette, the preparation method of which is

[0113] Comparative Application Example 2

[0114] This comparative application example provides a heat-not-burn cigarette, the preparation method of which is

[0115] (1) glycerol and polyethylene glycol 6000 were mixed at a mass ratio of 1:3 to obtain a mixture;

[0116] (2) the mixture of step (1) was mixed and dissolved with 50% ethanol aqueous solution at a solid-liquid ratio of 1:15 g / mL, then uniformly coated in tobacco sheet (5 times the mass of the mixture), cut and loaded into the heat-not-burn cigarette segment to obtain the heat-not-burn cigarette.

[0117] Comparative Application Example 3

[0118] This comparative application example provides a heat-not-burn cigarette, the preparation method of which is

[0119] Glycerol and 50% ethanol aqueous solution were mixed and dissolved at a solid-liquid ratio of 1:15 g / mL, then uniformly coated in tobacco sheet (5 times the mass of glycerol), cut and loaded into the heat-not-burn cigarette segment to obtain the heat-not-burn cigarette.

[0120] Comparative Application Example 4

[0121] This comparative application example provides a heat-not-burn cigarette, the preparation method of which is

[0122] Glycerol and 50% ethanol aqueous solution were mixed and dissolved at a solid-liquid ratio of 1:15 g / mL, then uniformly coated in tobacco sheet (7 times the mass of glycerol), cut and loaded into the heat-not-burn cigarette segment to obtain the heat-not-burn cigarette.

[0123] Comparative Application Example 5

[0124] This comparative application example provides a heat-not-burn cigarette, the preparation method of which is

[0125] Glycerol and 50% ethanol aqueous solution were mixed and dissolved at a solid-liquid ratio of 1:15 g / mL, then uniformly coated in tobacco sheet (10 times the mass of glycerol), cut and loaded into the heat-not-burn cigarette segment to obtain the heat-not-burn cigarette.

[0126] Test Example 1

[0127] (1) The heated cigarettes of application examples 1-17 and comparative application examples 1-5 were stored in a constant temperature and humidity chamber with a design temperature of 25℃ and a humidity of 80% rH for 60 days, and then the appearance was observed, with the following standards:

[0128] Grade A: no yellow spots; Grade B: with spots; Grade C: with patchy yellow spots; Grade D: large area of yellow spots;

[0129] (2) The determination of ammonia content in cigarettes was carried out according to the method of “YC / T 377-2019 Determination of ammonia in mainstream cigarette smoke by ion chromatography with impregnated Cambridge filter pad trapping”.

[0130] (3) The heated cigarettes of application examples 1-17 and comparative application examples 1-5 were smoked. According to the national standard of “Technical requirements for cigarette sensory evaluation” (GB5606.4-2005), 7 sensory evaluation personnel were organized to evaluate the heated cigarettes, mainly to investigate the amount of exhaled smoke of the heated cigarettes under fixed environmental wind. The above indexes were evaluated by scoring, and the amount of exhaled smoke under environmental wind was scored from 0 to 10, wherein the higher the score, the better the feeling or the higher the acceptance of the evaluation index during smoking.

[0131] The test results are shown in Table 1

[0132] Table 1

[0133]

[0134]

[0135] As can be seen from the data in Table 1, compared with comparative application example 3-5, the polymeric aerogel for cigarettes of the present application can reduce the use amount of smoking agent while not reducing the sensory experience of heated cigarettes. The reduction of the use amount of smoking agent can significantly reduce the hygroscopicity of heated cigarettes, and the ammonia content in the smoke of heated cigarettes is also significantly reduced after adding the polymeric aerogel for cigarettes.

[0136] The applicant declares that the polymeric aerogel for cigarettes, the preparation method and the application thereof of the present application are illustrated by the above examples, but the present application is not limited to the above examples, i.e. it does not mean that the present application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific modes, etc. all fall within the protection scope and disclosure scope of the present application.

[0137] The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, which all belong to the protection scope of the present application.

[0138] It should be further noted that the various technical features described in the above detailed description can be combined in any suitable manner without necessarily being mutually exclusive, to form various embodiments of the application, and the application is not limited to the specific combinations set out in the above detailed description.

Claims

1. A smoking polymer aerogel, characterized in that, The preparation raw material of the polymer aerogel for cigarettes comprises modified nanocellulose 5-25 parts and polyethylene glycol 1-5 parts by weight; The modified nanocellulose is obtained by pretreating nanocellulose with a deep eutectic solvent; The preparation raw material of the deep eutectic solvent comprises choline chloride and oxalic acid; The preparation method of the modified nanocellulose comprises adding nanocellulose into a deep eutectic solvent, stirring to react, the reaction temperature is 95-110℃, the reaction time is 1.5-3h, after the reaction is completed, cooling, filtering and washing are performed, and the modified nanocellulose is obtained; The material-liquid ratio of the nanocellulose to the deep eutectic solvent is 1: (10-40) g / mL; The polyethylene glycol comprises any one or a combination of at least two of polyethylene glycol 6000, polyethylene glycol 8000 or polyethylene glycol 10000; The nanocellulose is prepared by the following method: (1) taking discarded tobacco stems as raw materials, hot water extraction is performed at 70℃, and after filtering, the filtrate is removed; (2) the raw materials treated in step (1) are subjected to cooking reaction at 100℃ to remove non-fiber components in the tobacco stem fiber raw materials, and the slurry after cooking is taken out and cooled; (3) isopropanol and cationic etherifying agent are added into the slurry, the mass ratio of the slurry, isopropanol and cationic etherifying agent is 1:0.2:0.2, cationization reaction is performed at 60℃, after the cationization reaction is completed, the tobacco stem slurry is transferred to a beaker, and then poured into a Buchner funnel and washed with distilled water until the filtrate is neutral; (4) the filtrate is diluted and poured into the feed tank of a high-pressure homogenizer, the tobacco stem fibers are cut by the strong mechanical shearing action of the high-pressure homogenizer, and after circulating for multiple times, the final sample is collected, and the nanocellulose is obtained.

2. The smoking polymeric aerogel of claim 1, wherein, The preparation method of the deep eutectic solvent comprises reacting choline chloride with oxalic acid, and the deep eutectic solvent is obtained when the system is transparent.

3. The polymeric aerogel for smoking articles according to claim 2, wherein The molar ratio of choline chloride to oxalic acid is 1: (0.5-1.5).

4. The smoking polymeric aerogel of claim 2, wherein, The reaction temperature of choline chloride and oxalic acid is 85-95℃.

5. The method of making a polymeric aerogel for smoking articles according to any one of claims 1-4, wherein, The preparation method of the polymer aerogel for cigarettes comprises stirring the modified nanocellulose and polyethylene glycol to react, after the reaction is completed, the product is put into an ethanol aqueous solution for dialysis, and after freezing, drying, the polymer aerogel for cigarettes is obtained.

6. The method of making a polymer aerogel for smoking articles according to claim 5, wherein, The reaction temperature of the modified nanocellulose and polyethylene glycol is 140℃-160℃.

7. The method of making a polymer aerogel for smoking articles according to claim 5, wherein, The reaction of the modified nanocellulose and polyethylene glycol is performed under reflux condensation of inert gas.

8. The method of making a polymer aerogel for smoking articles according to claim 7, wherein, The inert gas is nitrogen.

9. The method of making a polymer aerogel for smoking articles according to claim 7, wherein, The reflux condensation time is 8-15h.

10. The method of making a polymeric aerogel for smoking articles of claim 5, wherein, The concentration of the ethanol aqueous solution is 5-15%.

11. The method of making a polymeric aerogel for smoking articles of claim 5, wherein, The dialysis time is 24-72h.

12. The method of making a polymeric aerogel for smoking articles of claim 5, wherein, The freezing temperature is -10-0℃.

13. The method of making a polymeric aerogel for smoking articles of claim 5, wherein, The drying is vacuum freeze-drying.

14. Use of the polymer aerogel for cigarettes according to any one of claims 1-4 in the preparation of a heat-not-burn cigarette.

15. The use according to claim 14, wherein the compound is ###00010### 15 The method of use comprises mixing a smoking agent with the polymer aerogel for cigarettes, coating in tobacco sheet, cutting and loading into a heat-not-burn cigarette segment to obtain the heat-not-burn cigarette.

16. The use according to claim 15, wherein The mass ratio of the smoking agent to the polymer aerogel for cigarettes is 1: (3-5).

17. The use of claim 15, wherein the compound is ###00010### 15 The smoking agent comprises any one or a combination of at least two of glycerol, 1,2-propanediol or 1,3-butanediol.

18. The use of claim 15, wherein, The mixture is dissolved in an ethanol aqueous solution after the mixing.

19. The use according to claim 18, wherein the compound is ###00009### 18 The concentration of the ethanol aqueous solution is 50-60%.

20. The use of claim 18, wherein, The solid-liquid ratio of the mixture to the ethanol aqueous solution is 1: (10-20) g / mL.

21. The use of claim 18, wherein, The mixture accounts for 15-20% of the total amount of the tobacco sheet.

22. The use of claim 15, wherein, The tobacco sheet is allowed to stand after the coating, and is subjected to a shredding treatment after the ethanol is volatilized.

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