Carrier for heated cigarettes and preparation method thereof

Abstract

The present invention discloses a carrier for heated cigarettes and a preparation method thereof, relating to the technical field of heated cigarettes. The present invention discloses a carrier for heated cigarettes, wherein the carrier comprises natural inorganic mineral particles as a core, and a composite fiber layer wrapped around the core. The composite fiber layer is formed by wrapping and winding aldehyde-modified microcrystalline cellulose / modified polylactic acid nanocomposite fibers, forming a cotton-like structure. The composite fiber layer also contains expanded graphite. The present invention discloses a carrier for heated cigarettes that can carry a larger amount of smoke-generating and flavor-generating agents, while having good thermal conductivity and preventing the introduction of additional impurities during use, thereby ensuring a certain degree of smoking quality.

Description

Technical Field

[0001] The present invention relates to the technical field of heated cigarettes, and in particular to a carrier for heated cigarettes and a preparation method thereof. Background Art

[0002] Heat-not-burn (HNB) tobacco products utilize a specialized heat source to heat a core made of shredded tobacco or other tobacco materials (150-500°C). This heat is not combusted, but rather releases less harmful substances than traditional cigarettes while still providing consumers with a distinct tobacco experience. Heat-not-burn (HNB) tobacco products are primarily categorized by heat source: electric heating, carbon heating, physical and chemical reaction heating, and other sources. Currently, electric heating is the dominant HNB product on the market.

[0003] At present, the research on the core materials of the heating section of heat-not-burn cigarettes mainly focuses on reconstituted tobacco leaves, shredded tobacco, cut stems and particles. The particles are mainly obtained by crushing the tobacco raw materials and then fully mixing them with spice plant particles, tobacco flavors, starch adhesives, propylene glycol and tobacco starch preservatives to obtain semi-finished smoking materials. However, during the smoking process, the spice plant particles used not only have poor thermal conductivity, resulting in uneven heating of the particles as a whole, but also emit a green plant odor, which affects the taste of the smoke. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to disclose a carrier for heated cigarettes and a preparation method thereof, which can carry more smoke-generating agents and flavor-generating agents, and at the same time has good thermal conductivity and will not introduce additional impurities during use, thereby ensuring the taste of smoking to a certain extent.

[0005] Specifically, the present invention provides a carrier for heated cigarettes, wherein the carrier has natural inorganic mineral particles as a core, and a composite fiber layer wrapped around the core. The composite fiber layer is a cotton-like structure formed by wrapping and winding aldehyded microcrystalline cellulose / modified polylactic acid nanocomposite fibers, and the composite fiber layer also carries expanded graphite.

[0006] The carrier for heated cigarettes of the present invention uses natural inorganic mineral particles with good thermal conductivity as the supporting core, which plays an overall supporting role, and then a composite fiber layer is wrapped around the core. On the one hand, the cotton-like structure of the composite fiber layer increases the specific surface area of the entire carrier, which is conducive to loading more smoke-generating agents and flavor-generating agents during subsequent use, and is also conducive to the emission of smoke-generating agents and flavor-generating agents during smoking. In addition, expanded graphite is also loaded in the composite fiber layer, which further increases the load capacity of the composite fiber layer. At the same time, expanded graphite also has good thermal conductivity, so it can increase the thermal conductivity of the composite fiber layer, thereby ensuring the thermal conductivity of the entire carrier. On the other hand, the composite fiber layer of the present invention is formed with aldehyde-modified microcrystalline cellulose / modified polylactic acid nanocomposite fibers, which are environmentally friendly and degradable, and are environmentally friendly.

[0007] Furthermore, the modified polylactic acid is obtained by chitosan-polylactic acid graft copolymerization.

[0008] By modifying the polylactic acid, firstly, the addition of microcrystalline cellulose can play a certain role in enhancing the modification, and then the microcrystalline cellulose is aldehyde-formylated. The aldehyde groups on the aldehyde-formylated microcrystalline cellulose can undergo a cross-linking reaction with the amino groups in the chitosan in the modified polylactic acid, thereby further increasing the strength of the nano-composite fiber, so that it can maintain a certain hardness during the winding process, which can not only prevent the composite fiber from easily breaking during the winding process, but also prevent the fibers from being too soft and fitting too tightly during winding to a certain extent, thereby achieving the effect of maintaining the shape of the composite fiber layer. The chitosan added to the polylactic acid makes the modified polylactic acid have certain adhesion properties, which is more conducive to the subsequent composite use of the carrier.

[0009] Furthermore, the inorganic mineral particles are silica-containing mineral particles.

[0010] Furthermore, the inorganic mineral particles are any one of river sand, sea sand and mountain sand.

[0011] Furthermore, the particle size of the inorganic mineral particles is 80-100 mesh.

[0012] In addition, the present invention also discloses a method for preparing the above-mentioned carrier for heated cigarettes, which comprises the following steps:

[0013] S1: taking half of the prepared nanocomposite fibers, electrostatically spraying expanded graphite powder on the surface of the nanocomposite fibers to obtain secondary composite fibers, spraying the remaining nanocomposite fibers with a dichloromethane solution, and then twisting the remaining nanocomposite fibers with the secondary composite fibers to obtain a double composite fiber;

[0014] S2: Select inorganic mineral particles, clean them, dry them, and perform surface thermal oxidation treatment before use;

[0015] S3: Wrapping the double composite fibers prepared in S1 around the surface of inorganic mineral particles to form a composite fiber layer to obtain composite particles, extracting the composite particles with methanol, and then dialyzing and washing them with deionized water, and drying them to obtain a carrier for heated cigarettes.

[0016] The expanded graphite powder is compounded onto the surface of the nanocomposite fiber by electrostatic spraying, and then dichloromethane is sprayed on the remaining surface of the nanocomposite fiber to make its surface slightly soluble. During the process of winding and twisting with the secondary composite fiber, the expanded graphite powder can be fixed to a certain extent, preventing it from falling off during winding and use.

[0017] Furthermore, the composite fiber layer has a thickness of 20-30 μm.

[0018] Furthermore, the preparation method of the nanocomposite fiber is:

[0019] Preparation of aldehyde-modified microcrystalline cellulose: 15 g of microcrystalline cellulose was stirred and dispersed in 100 g of distilled water, sodium periodate was added at a mass ratio of 1:0.9, and the mixture was stirred and reacted at 40°C in the dark for 8-12 hours to obtain aldehyde-modified microcrystalline cellulose.

[0020] Preparation of spinning solution: Take dried polylactic acid particles, stir and dissolve them in dichloromethane, heat them in a water bath to 40-45°C, keep them warm for 5-10 minutes, dropwise add isophorone diisocyanate, heat them to 50-55°C, add chitosan solution, then add benzoin dimethyl ether, and simultaneously dropwise add dibutyltin dilaurate, cool them to 35-40°C, add acetone, stir and react for 1-3 hours, add formaldehyded microcrystalline cellulose suspension, heat them to 60-65°C, and stir and mix at 800-1000 r / min for 1-2 hours to obtain spinning solution;

[0021] Spinning: The prepared spinning solution is mixed with polyvinyl alcohol for 1-2 hours to obtain a spinning solution, and the spinning solution is electrospun to obtain aldehyded microcrystalline cellulose / modified polylactic acid nanocomposite fibers.

[0022] Furthermore, the voltage of the electrospinning is 18 kV, and the propulsion speed is 0.0001 mm / s.

[0023] Beneficial effects of the present invention:

[0024] 1. The present invention discloses a carrier for heated cigarettes, in which a composite fiber layer is wrapped around an inorganic mineral particle core. During subsequent use, it is not only conducive to loading more smoke-generating agents and flavor-generating agents, but also has good thermal conductivity and will not introduce additional impurities during use, thereby ensuring the taste of smoking to a certain extent.

[0025] 2. The carrier for heated cigarettes of the present invention has a wide range of sources, is environmentally friendly and degradable, and is environmentally friendly. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to specific embodiments:

[0027] The present invention provides a carrier for heated cigarettes. The carrier has natural inorganic mineral particles as a core, and a composite fiber layer wrapped around the core. The composite fiber layer is formed by wrapping and winding aldehyded microcrystalline cellulose / modified polylactic acid nanocomposite fibers to form a cotton-like structure. Expanded graphite is also loaded in the composite fiber layer.

[0028] The details are as follows:

[0029] Example 1

[0030] Preparation of nanocomposite fibers

[0031] Preparation of aldehyde-modified microcrystalline cellulose: Weigh microcrystalline cellulose and disperse it in distilled water at a solid-liquid ratio of 150 g / L. Add 0.9 times the mass of the microcrystalline cellulose in the form of sodium periodate. Stir and react at 40°C in the dark for 8 h to obtain aldehyde-modified microcrystalline cellulose.

[0032] Preparation of spinning solution: Take the dried polylactic acid particles, stir and dissolve them in dichloromethane, heat the water bath to 45°C, keep warm for 5 minutes, add 0.04 times the mass of isophorone diisocyanate by weight of polylactic acid dropwise, heat to 55°C, add 1wt% chitosan solution, wherein the mass ratio of chitosan to polylactic acid is 1:5, then add benzoin dimethyl ether with the same mass of isophorone diisocyanate, and at the same time, add 0.02 times the mass of polylactic acid by weight of dibutyltin dilaurate dropwise, cool to 40°C, add acetone with 1 / 3 the volume of dichloromethane, stir and react for 1 hour, add 0.12 times the mass of polylactic acid by weight of formaldehyded microcrystalline cellulose suspension, heat to 65°C, and stir and mix at a speed of 800r / min for 1-2 hours to obtain a spinning solution, the mass fraction of polylactic acid in the spinning solution is 5%.

[0033] Spinning: The prepared spinning solution was taken and mixed with polyvinyl alcohol at a volume ratio of 1:9 for 2 hours to obtain a spinning solution. The spinning solution was electrospun at a voltage of 18 kV and a propulsion speed of 0.0001 mm / s to obtain formaldehyde-modified microcrystalline cellulose / modified polylactic acid nanocomposite fibers.

[0034] Preparation of carrier for heated cigarettes

[0035] S1: Take half of the prepared nanocomposite fibers, electrostatically spray expanded graphite powder on the surface of the nanocomposite fibers to obtain secondary composite fibers, and spray the remaining nanocomposite fibers with dichloromethane solution, and then twist them together with the secondary composite fibers to obtain double composite fibers.

[0036] S2: Select inorganic mineral particles. In this embodiment, river sand with a particle size of 80-85 mesh is selected. After cleaning, it is dried and then placed in a high-temperature furnace. Under oxygen-rich conditions, the temperature is raised to 400°C for surface thermal oxidation treatment for 30 minutes. After the treatment is completed, it is cooled to room temperature and taken out for use.

[0037] S3: Wrapping the double composite fibers prepared in S1 around the surface of inorganic mineral particles to form a composite fiber layer with a thickness of 30 μm to obtain composite particles. The composite particles are extracted with methanol, dialyzed and washed with deionized water, and dried to obtain a carrier for heated cigarettes.

[0038] Example 2

[0039] Preparation of aldehyde-modified microcrystalline cellulose: Weigh microcrystalline cellulose and disperse it in distilled water at a solid-liquid ratio of 120 g / L. Add 0.9 times the mass of the microcrystalline cellulose in the form of sodium periodate. Stir and react at 40°C in the dark for 10 h to obtain aldehyde-modified microcrystalline cellulose.

[0040] Preparation of spinning solution: Take the dried polylactic acid particles, stir and dissolve them in dichloromethane, heat the water bath to 40°C, keep warm for 10 minutes, add 0.04 times the mass of isophorone diisocyanate by weight of polylactic acid dropwise, heat to 55°C, add 1wt% chitosan solution, wherein the mass ratio of chitosan to polylactic acid is 1:4, then add benzoin dimethyl ether with the same mass of isophorone diisocyanate, and at the same time, add 0.02 times the mass of polylactic acid by weight of dibutyltin dilaurate dropwise, cool to 35°C, add acetone with 1 / 3 the volume of dichloromethane, stir and react for 3 hours, add aldehyde-modified microcrystalline cellulose suspension with 0.11 times the mass of polylactic acid, heat to 65°C, and stir and mix at a speed of 9000r / min for 2 hours to obtain a spinning solution, the mass fraction of polylactic acid in the spinning solution is 8%.

[0041] Spinning: The prepared spinning solution was taken and mixed with polyvinyl alcohol at a volume ratio of 1:8 for 2 hours to obtain a spinning solution. The spinning solution was electrospun at a voltage of 18 kV and a propulsion speed of 0.0001 mm / s to obtain formaldehyde-modified microcrystalline cellulose / modified polylactic acid nanocomposite fibers.

[0042] Preparation of carrier for heated cigarettes

[0043] S1: Take half of the prepared nanocomposite fibers, electrostatically spray expanded graphite powder on the surface of the nanocomposite fibers to obtain secondary composite fibers, and spray the remaining nanocomposite fibers with dichloromethane solution, and then twist them together with the secondary composite fibers to obtain double composite fibers.

[0044] S2: Select inorganic mineral particles. In this embodiment, sea sand with a particle size of 90-95 mesh is selected. After cleaning, it is dried and then placed in a high-temperature furnace. Under oxygen-rich conditions, the temperature is raised to 450°C for surface thermal oxidation treatment for 30 minutes. After the treatment is completed, it is cooled to room temperature and taken out for use.

[0045] S3: Wrapping the double composite fibers prepared in S1 around the surface of inorganic mineral particles to form a composite fiber layer with a thickness of 25 μm to obtain composite particles. The composite particles are extracted with methanol, dialyzed and washed with deionized water, and dried to obtain a carrier for heated cigarettes.

[0046] Example 3

[0047] Preparation of aldehyde-modified microcrystalline cellulose: Weigh microcrystalline cellulose and disperse it in distilled water at a solid-liquid ratio of 140 g / L. Add 0.9 times the mass of the microcrystalline cellulose in the form of sodium periodate. Stir and react at 40°C in the dark for 12 h to obtain aldehyde-modified microcrystalline cellulose.

[0048] Preparation of spinning solution: Take the dried polylactic acid particles, stir and dissolve them in dichloromethane, heat the water bath to 40°C, keep warm for 8 minutes, add 0.06 times the mass of isophorone diisocyanate by weight of polylactic acid dropwise, heat to 50°C, add 1wt% chitosan solution, wherein the mass ratio of chitosan to polylactic acid is 1:6, then add benzoin dimethyl ether with the same mass of isophorone diisocyanate, and at the same time, add 0.03 times the mass of polylactic acid by weight of dibutyltin dilaurate dropwise, cool to 35°C, add acetone with 1 / 3 the volume of dichloromethane, stir and react for 2 hours, add 0.1 times the mass of polylactic acid by weight of formaldehyded microcrystalline cellulose suspension, heat to 60°C, and stir and mix at a speed of 1000r / min for 1 hour to obtain a spinning solution, the mass fraction of polylactic acid in the spinning solution is 6%.

[0049] Spinning: The prepared spinning solution was taken and mixed with polyvinyl alcohol at a volume ratio of 1:9 for 1 hour to obtain a spinning solution. The spinning solution was electrospun at a voltage of 18 kV and a propulsion speed of 0.0001 mm / s to obtain formaldehyde-modified microcrystalline cellulose / modified polylactic acid nanocomposite fibers.

[0050] Preparation of carrier for heated cigarettes

[0051] S1: Take half of the prepared nanocomposite fibers, electrostatically spray expanded graphite powder on the surface of the nanocomposite fibers to obtain secondary composite fibers, and spray the remaining nanocomposite fibers with dichloromethane solution, and then twist them together with the secondary composite fibers to obtain double composite fibers.

[0052] S2: Select inorganic mineral particles. In this embodiment, mountain sand with a particle size of 90-100 mesh is selected. After cleaning, it is dried and then placed in a high-temperature furnace. Under oxygen-rich conditions, the temperature is raised to 420°C for surface thermal oxidation treatment for 30 minutes. After the treatment is completed, it is cooled to room temperature and taken out for use.

[0053] S3: Wrapping the double composite fibers prepared in S1 around the surface of inorganic mineral particles to form a composite fiber layer with a thickness of 25 μm to obtain composite particles. The composite particles are extracted with methanol, dialyzed and washed with deionized water, and dried to obtain a carrier for heated cigarettes.

[0054] The carriers for heated cigarettes prepared in Examples 1 to 3 were mixed with smoke-generating agents, flavoring agents, and other raw materials according to conventional methods to form smoking particles, which were then packaged into cigarette tubes for sensory evaluation. Existing smoking particles using spice plant particles as carriers were used for comparison. The evaluation results are shown in Table 1.

[0055] Table 1 Sensory evaluation results of suction particles

[0056]

[0057] It can be seen from the sensory evaluation results that the suction particles prepared using the carrier of the present application have a cleaner aroma and no green smell.

[0058] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalents shall be encompassed by the claims of the present invention. Any techniques, shapes, and structures not described in detail herein are well known.

Claims

1. A carrier for heating cigarettes, characterized in that: The carrier is based on natural inorganic mineral particles as the core, and the core is wrapped with a composite fiber layer. The composite fiber layer is a cotton-like structure formed by wrapping and winding aldehyded microcrystalline cellulose and modified polylactic acid nanocomposite fibers. Expanded graphite is also loaded in the composite fiber layer.

2. A carrier for heated cigarettes according to claim 1, characterized in that: The modified polylactic acid is obtained by graft copolymerization of chitosan and polylactic acid.

3. A carrier for heated cigarettes according to claim 2, characterized in that: The inorganic mineral particles are silica-containing mineral particles.

4. A carrier for heated cigarettes according to claim 3, characterized in that: The inorganic mineral particles are any one of river sand, sea sand and mountain sand.

5. The carrier for heated cigarettes according to claim 4, characterized in that: The particle size of the inorganic mineral particles is 80-100 meshes.

6. The method for preparing a carrier for heated cigarettes according to any one of claims 1 to 5, characterized in that: The preparation method The following steps are involved: S1: taking half of the prepared nanocomposite fibers, electrostatically spraying expanded graphite powder on the surface of the nanocomposite fibers to obtain secondary composite fibers, spraying the remaining nanocomposite fibers with a dichloromethane solution, and then twisting the remaining nanocomposite fibers with the secondary composite fibers to obtain dual composite fibers; S2: Select inorganic mineral particles, clean them, dry them, and perform surface thermal oxidation treatment before use; S3: Wrapping the double composite fibers prepared in S1 around the surface of inorganic mineral particles to form a composite fiber layer to obtain composite particles, extracting the composite particles with methanol, dialyzing and washing with deionized water, and drying to obtain a carrier for heated cigarettes.

7. The method for preparing a carrier for heated cigarettes according to claim 6, characterized in that: The thickness of the composite fiber layer is 20-30 μm.

8. The method for preparing a carrier for heated cigarettes according to claim 7, characterized in that: The preparation method of the nanocomposite fiber is as follows: Preparation of aldehyde-modified microcrystalline cellulose: Disperse microcrystalline cellulose in distilled water, add sodium periodate, and stir at 40°C in the dark for 8-12 hours to obtain aldehyde-modified microcrystalline cellulose. Preparation of spinning solution: Take dried polylactic acid particles, stir and dissolve them in dichloromethane, heat them in a water bath to 40-45°C, keep them warm for 5-10 minutes, dropwise add isophorone diisocyanate, heat them to 50-55°C, add chitosan solution, then add benzoin dimethyl ether, and simultaneously dropwise add dibutyltin dilaurate, cool them to 35-40°C, add acetone, stir and react for 1-3 hours, add formaldehyded microcrystalline cellulose suspension, heat them to 60-65°C, and stir and mix at 800-1000 r / min for 1-2 hours to obtain spinning solution; Spinning: The prepared spinning solution is mixed with polyvinyl alcohol for 1-2 hours to obtain a spinning solution, and the spinning solution is subjected to electrostatic spinning to obtain aldehyded microcrystalline cellulose and modified polylactic acid nanocomposite fibers.

9. The method for preparing a carrier for heated cigarettes according to claim 8, characterized in that: The voltage of the electrospinning was 18 kV, and the propulsion speed was 0.0001 mm / s.

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