A polylactic acid-based cooling and fragrance-releasing material for cigarettes, and its preparation method and application

Abstract

The present invention provides a polylactic acid-based cooling and flavor-releasing material for cigarettes, and its preparation method and application. The polylactic acid-based cooling and flavor-releasing material for cigarettes includes a cylindrical substrate and fiber spinning wrapped around the surface of the cylindrical substrate; the cylindrical substrate includes any one of kaolin, diatomaceous earth, or bentonite, or a combination of at least two; the fiber spinning is made of lactic acid, polyvinyl alcohol, glycerol, flavoring, and nano-iron powder through microfluidic electrospinning combined with ultraviolet-excited polymerization. The polylactic acid-based cooling and flavor-releasing material for cigarettes of the present invention undergoes a phase change and can absorb a large amount of heat, effectively reducing the temperature of the flue gas. When the flue gas flows through the cooling and flavor-releasing material, part of the flue gas heat directly acts on the fibers, and part of the heat is conducted to the cylindrical substrate. The cylindrical substrate releases part of the heat to the fibers, and the heat acting on the fibers is rapidly conducted, further absorbing the flue gas heat to promote the heat absorption and volatilization of the flavoring, releasing a certain amount of fragrance, and enhancing the taste of the cigarette.

Description

Technical Field

[0001] The present invention belongs to the technical field of tobacco cooling materials, and in particular relates to a polylactic acid-based cooling and fragrance-releasing material for cigarettes, and a preparation method and application thereof. Background Art

[0002] Tobacco companies have conducted extensive research on reducing tar and harm in cigarettes, including research on tar-reducing filter rods and the development of heated cigarettes. Tar-reducing filter rods effectively adsorb tar in smoke, significantly reducing harmful components in the smoke. However, this also reduces the aroma of the smoke. How to simultaneously reduce tar and enhance the aroma of smoke is a pressing challenge for traditional cigarettes. Heated cigarettes, which use a baking process to release nicotine and flavor compounds, significantly reduce harmful components in the smoke, attracting a growing number of consumers. However, due to the shorter length of heated cigarettes, the smoke temperature can be too hot upon inhalation. Therefore, a material that can cool tobacco smoke and address the issue of mouthburn caused by heated cigarette smoke is needed. Therefore, the development of a safe and efficient smoke cooling and aroma-releasing material for heated cigarettes that effectively reduces smoke temperature without affecting smoke concentration and releases aroma components to enrich the smoke aroma, and a functional material that can also release aroma components in traditional cigarettes, has significant practical significance for improving the quality of both heated and traditional cigarettes. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes, and a preparation method and application thereof.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] In a first aspect, the present invention provides a polylactic acid-based cooling and flavor-releasing material for cigarettes, wherein the polylactic acid-based cooling and flavor-releasing material for cigarettes comprises a cylindrical substrate and fiber spinning wound on the surface of the cylindrical substrate.

[0006] The cylindrical substrate includes any one of kaolin, diatomaceous earth or bentonite, or a combination of at least two of them.

[0007] The fiber is made of lactic acid, polyvinyl alcohol, glycerol, essence and nano iron powder through microfluidic electrostatic spinning combined with ultraviolet excitation polymerization.

[0008] The polylactic acid-based cooling and flavor-releasing material for cigarettes described herein undergoes a phase change that absorbs a large amount of heat, effectively reducing smoke temperature. When smoke flows through the cooling and flavor-releasing material, some of the smoke heat directly acts on the fibers, while some is transferred to the cylindrical substrate. The cylindrical substrate then releases some of the heat to the fibers. The heat acting on the fibers is rapidly transferred, further absorbing the smoke heat and promoting the volatilization of the flavor, releasing a certain aroma and enhancing the taste of the cigarette.

[0009] The cylindrical substrate, made of solid kaolin and / or diatomaceous earth and / or bentonite, directs smoke to the cylinder's sidewalls, where nanofibers are formed. These fibers are composed of a three-stage polymer of polylactic acid, polyvinyl alcohol, and glycerol, nano-iron powder, and flavoring. The abundant surface hydroxyl groups of polyvinyl alcohol and glycerol allow the flavoring to adsorb to the three-stage polymer via hydrogen bonding.

[0010] In addition to its catalytic effect during the polymerization process, the nano-iron powder is evenly distributed throughout the three-stage polymer, improving the thermal conductivity of the fiber material. When smoke flows through the cooling and flavor-releasing material, a portion of the smoke heat directly acts on the fiber material, while a portion is transferred to the cylindrical substrate. The cylindrical substrate releases some of this heat to the fiber material. The heat acting on the fiber is rapidly transferred by the highly thermally conductive nano-iron powder, enhancing the phase transition effect of the three-stage polymer and further absorbing the smoke heat. Finally, the smoke heat is absorbed and volatilized by the flavoring agent for a third absorption. Due to the presence of the cylindrical substrate, even if the nanofiber undergoes morphological changes due to the phase transition, it will not affect smoke flow or the appearance of the cigarette.

[0011] Preferably, the mass ratio of the fiber spinning and the cylindrical substrate is (1-4):(16-24).

[0012] When the fiber spinning and cylindrical substrate meet the above ratios, the smoke cooling effect is better and the aroma release ability is better.

[0013] The specific point values ​​of 1-4 are, for example, 1, 2, 3, 4, etc. The specific point values ​​of 16-24 are, for example, 16, 18, 20, 22, 23, 24, etc. Any specific point value within the above numerical range can be selected, and will not be detailed here.

[0014] Preferably, the mass ratio of the lactic acid, polyvinyl alcohol, glycerol, essence and nano iron powder is (40-60):(10-20):(5-10):(5-10):(2-3);

[0015] The specific point values ​​of 40-60 are, for example, 40, 45, 50, 55, 60; the point values ​​of 10-20 are, for example, 10, 13, 15, 17, 18, 20, etc.; the specific point values ​​of 5-10 are, for example, 5, 6, 7, 8, 9, 10, etc.; the specific point values ​​of 2-3 are, for example, 2, 2.2, 2.4, 2.6, 2.8, 3, etc.

[0016] Specific point values ​​within the above numerical range can be selected and will not be described in detail here.

[0017] When the mass ratio of the lactic acid, polyvinyl alcohol, glycerol, essence and nano iron powder meets the above ratio, the prepared nanofiber has better thermal conductivity.

[0018] Preferably, the particle size of the nano iron powder is 50-100 nm, and the microscopic morphology is spherical.

[0019] The specific point values ​​of 50-100 are, for example, 50, 55, 60, 65, 70, 80, 90, 100, etc. Specific point values ​​within the above numerical range can be selected and will not be detailed here.

[0020] In a second aspect, the present invention provides a method for preparing the polylactic acid-based temperature-reducing and flavor-releasing material for cigarettes according to the first aspect, the preparation method comprising the following steps:

[0021] (1) Fiber spinning preparation: mixing raw materials, and performing microfluidic electrospinning under ultraviolet light irradiation to obtain fiber spinning;

[0022] The cylindrical substrate raw material is mixed with deionized water, 3D printed to obtain a clay embryo, which is then dried and calcined to form a cylindrical substrate;

[0023] (2) The fibers obtained in step (1) are spun and wound on the surface of a cylindrical substrate, and dried to obtain the polylactic acid-based cooling and fragrance-releasing material for cigarettes.

[0024] The present invention arranges ultraviolet light at the front end of the traditional microfluidic electrospinning feed, so that lactic acid, polyvinyl alcohol and glycerol undergo a polymerization reaction under the catalytic action of nano-iron powder to form a three-stage polymer of polylactic acid-polyvinyl alcohol-glycerol. The addition of polyvinyl alcohol and glycerol reduces the phase change temperature of the three-stage polymer material of polylactic acid-polyvinyl alcohol-glycerol to 45°C. When the flue gas passes through the material, the three-stage polymer material of polylactic acid-polyvinyl alcohol-glycerol undergoes a phase change and absorbs a large amount of heat, which can effectively reduce the flue gas temperature.

[0025] Preferably, in the microfluidic electrospinning of step (1), the spinning voltage is 15-25 kV, and the injection rate of the syringe is 0.5-1.5 mL / h;

[0026] The spinning voltage may be 15 kV, 17 kV, 20 kV, 23 kV, 25 kV, etc.

[0027] The injection rate can be 0.5 mL / h, 0.8 mL / h, 1.0 mL / h, 1.2 mL / h, 1.5 mL / h, etc. Specific values ​​within the above numerical range can be selected and will not be described in detail here.

[0028] Preferably, the ultraviolet light power in step (1) is 5-10W.

[0029] The ultraviolet light power can be 5W, 6W, 7W, 8W, 9W, 10W, etc.

[0030] Specific point values ​​within the above numerical range can be selected and will not be described in detail here.

[0031] Preferably, the mass ratio of the cylindrical substrate raw material to deionized water in step (1) is (5-10):(1-2).

[0032] The specific point values ​​of 5-10 are, for example, 5, 6, 7, 8, 9, 10, etc.

[0033] The specific point values ​​of 1-2 are, for example, 1, 1.2, 1.5, 2, etc. Any specific point value within the above numerical range can be selected, and will not be described in detail here.

[0034] Preferably, the speed of the 3D printing in step (1) is 20-40 mm / s, and the diameter of the 3D printing nozzle is 0.2-1 mm.

[0035] The specific point values ​​of 20-40 include 20, 23, 25, 27, 29, 31, 33, 35, 38, 40, etc.

[0036] The specific point values ​​of 0.2-1 are, for example, 0.2, 0.3, 0.5, 0.8, 1, etc. Any specific point value within the above numerical range can be selected, and will not be described in detail here.

[0037] Preferably, the drying temperature in step (1) is 80-120° C., the drying time is 1-6 h, the calcination temperature is 900-1200° C., and the calcination time is 4-16 h.

[0038] The drying temperature can be 80°C, 90°C, 100°C, 110°C, 120°C, etc.; the drying time can be 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, etc.; the calcination temperature can be 900°C, 1000°C, 1100°C, 1150°C, 1200°C, etc.; the calcination time can be 4 hours, 6 hours, 8 hours, 10 hours, 13 hours, 14 hours, 15 hours, 16 hours, etc. Specific values ​​within the above numerical range can be selected and will not be repeated here.

[0039] Preferably, the drying temperature in step (2) is 30-35°C.

[0040] The drying temperature can be 30° C., 31° C., 32° C., 33° C., 34° C., 35° C., etc. Specific values ​​within the above numerical range can be selected, and will not be described in detail here.

[0041] In a third aspect, the present invention provides use of the polylactic acid-based temperature-reducing and flavor-releasing material for cigarettes described in the first aspect in the preparation of cigarettes.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The polylactic acid-based cooling and flavor-releasing material for cigarettes described herein undergoes a phase change that absorbs a large amount of heat, effectively reducing smoke temperature. When smoke flows through the cooling and flavor-releasing material, some of the smoke heat directly acts on the fibers, while some is transferred to the cylindrical substrate. The cylindrical substrate then releases some of the heat to the fibers. The heat acting on the fibers is rapidly transferred, further absorbing the smoke heat and promoting the volatilization of the flavor, releasing a certain aroma and enhancing the taste of the cigarette. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a performance diagram of the cooling material prepared in Example 1;

[0045] Figure 2 This is a performance diagram of the cooling material prepared in Example 2;

[0046] Figure 3 This is a performance diagram of the cooling material prepared in Example 3;

[0047] Figure 4 This is a performance diagram of the cooling material prepared in Comparative Example 1;

[0048] Figure 5 This is a performance diagram of the cooling material prepared in Comparative Example 2;

[0049] Figure 6 This is a performance diagram of the cooling material prepared in Comparative Example 3;

[0050] Figure 7 This is the test result of cigarettes without cooling materials. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0052] The sources of some components in the following examples and comparative examples are as follows:

[0053] Lactic acid was sourced from Sinopharm Chemical Reagent Co., Ltd.; the product with CAS number 50-21-5; polyvinyl alcohol was sourced from Sinopharm Chemical Reagent Co., Ltd.; the product with CAS number 9002-89-5; nano-iron powder was sourced from Shanghai Xiangtian Nanomaterials Co., Ltd.; peppermint oil was sourced from Sinopharm Chemical Reagent Co., Ltd.; the product with CAS number 68917-18-0; star anise oil was sourced from Jiangxi Baicao Pharmaceutical Co., Ltd.; and rose oil was sourced from Jiangxi Baicao Pharmaceutical Co., Ltd.

[0054] Example 1

[0055] This embodiment provides a polylactic acid-based cooling and fragrance-releasing material for cigarettes, the preparation method of which is as follows:

[0056] (1) Preparation of three-stage polymer nanofibers

[0057] 40g of lactic acid, 10g of polyvinyl alcohol, 5g of glycerol, 5g of peppermint oil, and 2g of nano-iron powder were mixed and stirred thoroughly. The mixture was then added to a microfluidic electrospinning machine and spun at a voltage of 15kV and an injection rate of 0.5mL / h. At the same time, a 5W ultraviolet light was irradiated above the microfluidic syringe in the microfluidic electrospinning machine to stimulate the polymerization of lactic acid, polyvinyl alcohol, and glycerol to obtain three-segment polymer nanofibers.

[0058] (2) Preparation of cylindrical substrate

[0059] 10g of kaolin, 4g of diatomaceous earth and 2g of deionized water were mixed and stirred to form a slurry, which was then extruded and printed using a 3D printer to obtain a clay embryo. The clay embryo was then dried at 80°C for 6h and then calcined at 900°C for 16h to form a cylindrical substrate.

[0060] (3) Preparation of cooling and fragrance-releasing materials

[0061] 0.4 g of the nanofibers obtained in step (1) were wound around 2 g of the cylindrical substrate obtained in step (2), and then dried at 35° C. for 1 h to obtain a cooling and fragrance-releasing material.

[0062] (4) Flue gas temperature test

[0063] According to the national standard YC / T29-1996, the smoking mode of cigarettes was simulated. The temperature at the center of the cigarette filter rod 2 mm from the mouth end was detected using a K-type thermocouple temperature detector. The number of simulated smoking times was 9, with a puff interval of 30 seconds. The maximum temperature of the smoke was 43.2°C. Figure 1 shown.

[0064] (5) Smoke sensory evaluation

[0065] The cooling and aroma-releasing material prepared in Example 1 was prepared into cigarettes, each comprising a composite of a fiber acetate segment, a cooling and aroma-releasing material segment, and a tobacco segment. Ten smokers conducted a sensory evaluation of the sample cigarettes, and the results showed that the smoke temperature was appropriate and the mint flavor was very pleasant to inhale.

[0066] Example 2

[0067] This embodiment provides a polylactic acid-based cooling and fragrance-releasing material for cigarettes, the preparation method of which is as follows:

[0068] (1) Preparation of three-stage polymer nanofibers

[0069] 50g of lactic acid, 15g of polyvinyl alcohol, 7g of glycerol, 7g of star anise oil, and 2.5g of nano-iron powder were mixed and stirred thoroughly. The mixture was then added to a microfluidic electrospinning machine and spun at a voltage of 20kV and an injection rate of 1mL / h. At the same time, 8W of ultraviolet light was irradiated above the microfluidic syringe in the microfluidic electrospinning machine to stimulate the polymerization of lactic acid, polyvinyl alcohol, and glycerol to obtain three-segment polymer nanofibers.

[0070] (2) Preparation of cylindrical substrate

[0071] 11g of kaolin, 5g of diatomaceous earth, and 2.5g of deionized water were mixed and stirred to form a slurry, which was then extruded and printed using a 3D printer to obtain a clay embryo. The clay embryo was then dried at 100°C for 3h and then calcined at 1000°C for 12h to form a cylindrical substrate.

[0072] (3) Preparation of cooling and fragrance-releasing materials

[0073] 0.2 g of the nanofibers obtained in step (1) were wound around 2 g of the cylindrical substrate obtained in step (2), and then dried at 35° C. for 1 h to obtain a cooling and fragrance-releasing material.

[0074] (4) Cooling performance test

[0075] According to the cigarette smoking model specified in the national standard YC / T29-1996, the smoking was simulated. A K-type thermocouple temperature detector was used to detect the temperature at the center of the cigarette filter rod 2 mm from the mouth end. The number of simulated smoking times was 9, with a puff interval of 30 seconds. The maximum smoke temperature was 44.7°C. Figure 2 shown.

[0076] (5) Smoke sensory evaluation

[0077] The cooling and aroma-releasing material prepared in Example 2 was used to prepare cigarettes. The cigarettes were composed of a composite of a fiber acetate segment, a cooling and aroma-releasing material segment, and a tobacco segment. Ten smokers conducted a sensory evaluation of the sample cigarettes. The results showed that the smoke had an appropriate temperature, a refreshing and spicy aniseed aroma, and was very pleasant to inhale, effectively improving the aftertaste in the mouth.

[0078] Example 3

[0079] This embodiment provides a polylactic acid-based cooling and fragrance-releasing material for cigarettes, the preparation method of which is as follows:

[0080] (1) Preparation of three-stage polymer nanofibers

[0081] 60g of lactic acid, 20g of polyvinyl alcohol, 10g of glycerol, 10g of rose oil, and 3g of nano-iron powder were mixed and stirred thoroughly. The mixture was then added to a microfluidic electrospinning machine and spun at a voltage of 25kV and an injection rate of 1.5mL / h. At the same time, a 10W ultraviolet light was irradiated above the microfluidic syringe in the microfluidic electrospinning machine to stimulate the polymerization of lactic acid, polyvinyl alcohol, and glycerol to obtain three-segment polymer nanofibers.

[0082] (2) Preparation of cylindrical substrate

[0083] 12g of kaolin, 6g of diatomaceous earth and 3g of deionized water were mixed and stirred to form a slurry, which was then extruded and printed using a 3D printer to obtain a clay embryo. The clay embryo was then dried at 120°C for 1h and then calcined at 1200°C for 4h to form a cylindrical substrate.

[0084] (3) Preparation of cooling and fragrance-releasing materials

[0085] 0.1 g of the nanofibers obtained in step (1) were wound around 2 g of the cylindrical substrate obtained in step (2), and then dried at 35° C. for 1 h to obtain a cooling and fragrance-releasing material.

[0086] (4) Cooling performance test

[0087] According to the cigarette smoking model specified in the national standard YC / T29-1996, the smoking was simulated. A K-type thermocouple temperature detector was used to detect the temperature at the center of the cigarette filter rod 2 mm from the mouth end. The number of simulated smoking times was 9, with a puff interval of 30 seconds. The maximum smoke temperature was 45.9°C. Figure 3 shown.

[0088] (5) Smoke sensory evaluation

[0089] The cooling and aroma-releasing material prepared in Example 3 was used to prepare cigarettes. The cigarettes were composed of a composite of a fiber acetate segment, a cooling and aroma-releasing material segment, and a tobacco segment. Ten smokers conducted a sensory evaluation of the sample cigarettes. The results showed that the smoke had an appropriate temperature and a rose-like aroma, providing a very pleasant inhalation experience.

[0090] Comparative Example 1

[0091] This comparative example provides a polylactic acid-based cooling and fragrance-releasing material for cigarettes, and the preparation method is as follows:

[0092] (1) Preparation of cooling and fragrance-releasing materials

[0093] The difference between the preparation method of this comparative example and that of Example 1 is that polyvinyl alcohol and glycerol are not added during the preparation of the polymer nanofibers, and other conditions are the same as those of Example 1.

[0094] (2) Cooling performance test

[0095] According to the national standard YC / T29-1996, the smoking mode of cigarettes was simulated. A K-type thermocouple temperature detector was used to detect the temperature at the center of the cigarette filter rod 2 mm from the mouth end. The number of simulated smoking times was 9, with a puff interval of 30 seconds. The maximum temperature of the smoke was 56.8°C. Figure 4 As shown;

[0096] (3) Smoke sensory evaluation

[0097] The material prepared in Comparative Example 1 was prepared into cigarettes, wherein the cigarettes were composited with acetate segments, test material segments, and tobacco material segments. Ten smokers conducted a sensory evaluation of the sample cigarettes, and the results showed that the smoke temperature was too high and the oral comfort was poor.

[0098] (4) Contrast effect

[0099] Compared with Example 1, when polyvinyl alcohol and propylene glycol are not added during the preparation of the cooling material, ultraviolet light cannot polymerize lactic acid and the other two substances to form a three-stage polymer, and its phase transition temperature is higher than 55° C., resulting in an unsatisfactory cooling effect.

[0100] Comparative Example 2

[0101] This comparative example provides a polylactic acid-based cooling and fragrance-releasing material for cigarettes, and the preparation method is as follows:

[0102] (1) Preparation of cooling and fragrance-releasing materials

[0103] The difference between the preparation method of this comparative example and that of Example 1 is that no ultraviolet light irradiation is performed during the preparation of the three-segment polymer nanofibers, and other conditions are the same as those of Example 1.

[0104] (2) Cooling performance test

[0105] According to the national standard YC / T29-1996, the smoking mode of cigarettes was simulated. A K-type thermocouple temperature detector was used to detect the temperature at the center of the cigarette filter rod 2 mm from the mouth end. The number of simulated smoking times was 9, with an interval of 30 seconds between each puff. The maximum temperature of the smoke was 62.1°C. Figure 5 As shown;

[0106] (3) Smoke sensory evaluation

[0107] The material prepared in Comparative Example 2 was prepared into cigarettes, wherein the cigarettes were composited with acetate segments, test material segments, and tobacco material segments. Ten smokers conducted a sensory evaluation of the sample cigarettes, and the results showed that the smoke temperature was too high, the smoke burned the mouth, and the oral comfort was poor.

[0108] (4) Contrast effect

[0109] Compared with Example 1, no ultraviolet light is introduced during material preparation, so that lactic acid and the other two substances cannot be polymerized to form three-segment polymer nanofibers. The mixed raw materials adhere to the outer periphery of the cylindrical substrate and cannot effectively cool the flue gas.

[0110] Comparative Example 3

[0111] This comparative example provides a polylactic acid-based cooling and fragrance-releasing material for cigarettes, and the preparation method is as follows:

[0112] (1) Preparation of cooling and fragrance-releasing materials

[0113] The difference between the preparation method of this comparative example and that of Example 1 is that the cylindrical substrate is directly calcined after drying during the preparation process, and other conditions are the same as those of Example 1.

[0114] (2) Cooling performance test

[0115] According to the national standard YC / T29-1996, the smoking mode of cigarettes was simulated. A K-type thermocouple temperature detector was used to detect the temperature at the center of the cigarette filter rod 2 mm from the mouth end. The number of simulated smoking times was 9, with a puff interval of 30 seconds. The maximum temperature of the smoke was 58.6°C. Figure 6 As shown;

[0116] (3) Smoke sensory evaluation

[0117] The material prepared in Comparative Example 3 was prepared into cigarettes, wherein the cigarettes were composited with acetate segments, test material segments, and tobacco material segments. Ten smokers conducted a sensory evaluation of the sample cigarettes, and ultimately, the ten smokers rated the sample cigarettes as having a high smoke temperature and burning the mouth.

[0118] (4) Contrast effect

[0119] Compared with Example 1, in the preparation of the cylindrical substrate, the baking is carried out directly without drying. The moisture in the clay embryo will evaporate strongly at high temperature, causing the interior of the cylindrical substrate to be destroyed. Most of the smoke will pass through the pores inside the substrate, and a small amount of smoke will pass through the cooling material on the side of the cylindrical substrate. Therefore, the temperature of the tobacco smoke is relatively high when it is inhaled, and the cooling effect cannot be achieved.

[0120] Comparative Example 4

[0121] This comparative example is a cigarette without cooling material, and the cigarette is composed of a composite of acetate fiber segments and tobacco material segments.

[0122] (1) Cooling performance test

[0123] According to the national standard YC / T29-1996, the smoking mode of cigarettes was simulated. A K-type thermocouple temperature detector was used to detect the temperature at the center of the cigarette filter rod 2 mm from the mouth end. The number of simulated smoking times was 9, with a puff interval of 30 seconds. The maximum temperature of the smoke was 67.5°C. Figure 7 shown.

[0124] (2) Smoke sensory evaluation

[0125] Ten smokers conducted a sensory evaluation of sample cigarettes without added cooling materials. Ultimately, the ten smokers rated the sample cigarettes as having a temperature that was too high and difficult to smoke.

[0126] The applicant declares that the present invention uses the above-described embodiments to illustrate the detailed process flow of the present invention, but the present invention is not limited to the above-described detailed process flow, that is, it does not mean that the present invention must rely on the above-described detailed process flow to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent replacements for various raw materials in the products of the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., are all within the scope of protection and disclosure of the present invention.

Claims

1. A polylactic acid-based cooling and aroma-releasing material for cigarettes, characterized in that: The polylactic acid-based cooling and fragrance-releasing material for cigarettes comprises a cylindrical substrate and fiber spinning wound on the surface of the cylindrical substrate; The cylindrical substrate comprises any one of kaolin, diatomaceous earth or bentonite, or a combination of at least two thereof; The fiber is made of lactic acid, polyvinyl alcohol, glycerol, essence and nano iron powder through microfluidic electrospinning combined with ultraviolet excited polymerization; The preparation method of the polylactic acid-based temperature-reducing and fragrance-releasing material for cigarettes comprises the following steps: (1) Fiber spinning preparation: Mix the raw materials and perform microfluidic electrospinning under ultraviolet light to obtain fiber spinning; The cylindrical substrate raw material is mixed with deionized water, 3D printed to obtain a clay embryo, which is then dried and calcined to form a cylindrical substrate; (2) The fibers obtained in step (1) are spun and wound on the surface of a cylindrical substrate, and dried to obtain the polylactic acid-based cooling and aroma-releasing material for cigarettes.

2. The polylactic acid-based temperature-reducing and flavor-releasing material for cigarettes according to claim 1, characterized in that: The mass ratio of the fiber spinning and the cylindrical substrate is (1-4): (16-24).

3. The polylactic acid-based temperature-reducing and flavor-releasing material for cigarettes according to claim 1, characterized in that: The mass ratio of the lactic acid, polyvinyl alcohol, glycerol, essence and nano iron powder is (40-60): (10-20): (5-10): (5-10): (2-3).

4. The polylactic acid-based temperature-reducing and flavor-releasing material for cigarettes according to claim 1, characterized in that: The particle size of the nano iron powder is 50-100 nm, and the microscopic morphology is spherical.

5. The method for preparing a polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: (1) Fiber spinning preparation: Mix the raw materials and perform microfluidic electrospinning under ultraviolet light to obtain fiber spinning; The cylindrical substrate raw material is mixed with deionized water, 3D printed to obtain a clay embryo, which is then dried and calcined to form a cylindrical substrate; (2) The fibers obtained in step (1) are spun and wound on the surface of a cylindrical substrate, and dried to obtain the polylactic acid-based cooling and aroma-releasing material for cigarettes.

6. The method for preparing the polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to claim 5, characterized in that: In the microfluidic electrospinning of step (1), the spinning voltage is 15-25 kV, and the injection rate of the syringe is 0.5-1.5 mL / h.

7. The polylactic acid-based temperature-reducing and flavor-releasing material for cigarettes according to claim 5, characterized in that: The power of the ultraviolet light in step (1) is 5-10W.

8. The method for preparing the polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to claim 5, characterized in that: In step (1), the mass ratio of the cylindrical substrate raw material to deionized water is (5-10): (1-2).

9. The method for preparing a polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to claim 5, characterized in that: The speed of the 3D printing in step (1) is 20-40 mm / s, and the diameter of the 3D printing nozzle is 0.2-1 mm.

10. The method for preparing the polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to claim 5, characterized in that: The drying temperature in step (1) is 80-120° C., the drying time is 1-6 hours, the calcination temperature is 900-1200° C., and the calcination time is 4-16 hours.

11. The method for preparing a polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to claim 5, characterized in that: The drying temperature in step (2) is 30-35°C.

12. Use of the polylactic acid-based temperature-reducing and aroma-releasing material for cigarettes according to any one of claims 1 to 4 in the preparation of cigarettes.

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