PHASE-CHANGE MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF

Abstract

 A phase change material, and a method for preparing the same and a use thereof are provided. The phase change material includes at least two of polylactic acid, polyglycolide-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol and polycaprolactone. The method for preparing the phase change material includes mixing at least two of the polylactic acid, the polyglycolide-lactide, the polyglycolide, the polyethylene, the polypropylene, the polyvinyl alcohol and the polycaprolactone to form the phase change material. A use of the phase change material for preparing a filter tip for a tobacco product is also provided. The phase change material has a high cooling efficiency, a low glass transition temperature, good heat conduction and heat storage properties. The preparation process is concise and efficient, and is widely used.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a phase change material and a method for preparing the same and a use thereof, and belongs to the technical field of cigarettes.

BACKGROUND

[0002] Low-temperature cigarettes heat the tobacco through external heating elements. The atomization medium in the cigarette, the flavor components in the tobacco and the additional fragrance are heated to produce smoke, instead of burning, such that the burning of tobacco in traditional cigarettes can be reduced, and known types of harmful smoke and dust components produced by can be thermally degraded. In low-temperature cigarettes heated by an external heat source, an important component is the cigarettes of the heated cigarettes, which are tobacco products that can release smoke aerosols under low-temperature heating conditions. The tobacco product reaches the atomization temperature under the condition of 250-350°C (degrees Celsius), and the temperature of high-temperature atomized smoke entering the oral cavity through the filter section is higher than the burning temperature of ordinary cigarettes. The development of cigarettes with suitable temperature is the key to low-temperature cigarettes.

[0003] Phase change materials are latent heat storage materials capable of absorbing and releasing high amounts of latent heat during melting and crystallization, respectively. When the phase change material changes from a solid phase to a liquid phase or from a liquid phase to a solid phase, thermal energy transfer occurs. During the phase change of this type of phase change material, the temperature of the phase change material remains almost constant, as is the space around the phase change material, and the heat flowing through the phase change material is "trapped" in the phase change material itself.

[0004] The existing low-temperature cigarette cooling technology mainly uses the filter tip material to cool the longitudinally flowing high-temperature smoke. Since the smoke passes rapidly, the cooling efficiency of the cooling material is required to be high. However, in the prior art, PLA (polylactic acid) material is mainly used for cooling. The glass transition temperature of the polylactic acid material is 60-65°C. After the polylactic acid material absorbs the heat of the smoke, the phase change occurs at this temperature, making the temperature of the smoke drop. However, since the phase transition temperature of the polylactic acid material is 60 to 65°C, the lowest temperature that the smoke temperature can be reduced to is the phase transition temperature of the polylactic acid material. Therefore, it hinders the further reduction of the smoke temperature and has a certain limitations to cooling efficiency.

SUMMARY

[0005] In view of the above-mentioned problems, the present disclosure is intended to provide a phase change material, a method for preparing the phase change material, and a use of the phase change material, such that the cooling efficiency of the smoke can be improve.

[0006] In order to achieve the above objectives, in one aspect, the present disclosure provides a phase change material, including two or more of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol, and polycaprolactone.

[0007] In a specific embodiment, the phase change material is doped with aluminum powder.

[0008] In a specific embodiment, a content of the aluminum powder is 0.001% to 0.1% by weight based on a total weight of the phase change material.

[0009] In a specific embodiment, a particle of the aluminum powder has a median diameter of 5-100 microns.

[0010] In a specific embodiment, a content of the polylactic acid is 5% to 75% by weight based on the total weight of the phase change material.

[0011] In a specific embodiment, a content of the polyethylene lactide is 2% to 75% by weight based on the total weight of the phase change material.

[0012] In a specific embodiment, a content of the polyglycolide is 2% to 75% by weight based on the total weight of the phase change material.

[0013] In a specific embodiment, a content of the polyethylene is 3% to85% by weight based on the total weight of the phase change material.

[0014] In a specific embodiment, a content of the polypropylene is 5% to 85% by weight based on the total weight of the phase change material.

[0015] In a specific embodiment, a content of the polyvinyl alcohol is 5% to 65% by weight based on the total weight of the phase change material.

[0016] In a specific embodiment, a content of the polycaprolactone is 5% to 65% by weight based on the total weight of the phase change material.

[0017] In a specific embodiment, the phase change material has a glass transition temperature of 47∼57 °C.

[0018] In a specific embodiment, the phase change material has a heat storage coefficient of 1∼4 w/(m²·K), and the phase change material has a thermal conductivity of 0.1-0.337 w/(m·K).

[0019] In another aspect, the present disclosure provide a method for preparing the phase change material above-mentioned, comprising the following steps: mixing at least two of the polylactic acid, the polyethylene-lactide, the polyethylene, the lyophilized resin, the polyethylene, the polypropylene, the polyvinyl alcohol, and the polycaprolactone to form the phase change material.

[0020] In another aspect, the present disclosure provide a use of the phase change material above-mentioned and the method for preparing the phase change material above-mentioned in a filter tip for a novel tobacco product.

[0021] In a specific embodiment, the filter tip comprises a film cooling section; the film cooling section comprises a filter rod formed by a film in a paper rod process.

[0022] In a specific embodiment, the film is made of the phase change material.

[0023] In a specific embodiment, the film has a thickness of 20∼60 microns.

[0024] In a specific embodiment, the filter tip comprises a firmware cooling section; the firmware cooling section comprises a firmware, and the firmware comprises a housing with two hollow ends, the housing is provided with two filter plates with holes at intervals inside the housing.

[0025] In a specific embodiment, the housing and the two filter plates with holes are all made of the phase change material.

[0026] In a specific embodiment, a low-temperature cigarette smoke temperature of the filter tip is lower than a low-temperature cigarette smoke temperature of the filter tip made of polylactic acid material.

[0027] In a specific embodiment, a temperature of a side surface where the filter tip is in contact with lips is lower than a temperature of a side surface where the filter tip is in contact with lips made of polylactic acid material.

[0028] On the basis of the phase change material above-mentioned, the present disclosure provides a filter tip, wherein the filter tip comprises a first hollow rod section close to a shredded tobacco section, and a first acetate rod section close to a mouth; a film cooling section is provided between the first hollow rod section and the first acetate rod section; the film cooling section comprises a filter rod formed by a film in a paper rod process; the film is made of the phase change material above-mentioned.

[0029] On the basis of the phase change material above-mentioned, the present disclosure provides a filter tip, wherein the filter tip comprises a second hollow rod section close to a shredded tobacco section, and a second acetate rod section close to a mouth; a firmware cooling section is provided between the second hollow rod section and the second acetate rod section; the firmware cooling section comprises a firmware, the firmware comprises a housing with two hollow ends, the housing is provided with two filter plates with holes at intervals inside the housing; the housing and the two filter plates with holes are all made of the phase change material above-mentioned.

[0030] Due to the adoption of the above technical solutions, the present disclosure has the following advantages:

1. The phase change material of the present disclosure has a low glass transition temperature and high cooling efficiency.

2. The phase change material of the present disclosure can improve the physical properties of traditional phase change materials.

3. The method for preparing the phase change material of the present disclosure is simple and efficient, and does not require investment in complicated processes and equipment.

4. The smoke temperature of the low-temperature cigarette of the filter tip of the present disclosure is lower than the smoke temperature of the low-temperature cigarette of the filter tip made of polylactic acid material, and the temperature of the side surface where the filter tip is in contact with the lips is lower than the temperature of the side surface where the filter tip is in contact with the lips made of polylactic acid material. The filter tip has high cooling efficiency, good cooling effect, and good safety.

[0031] Other features and advantages of the present disclosure will be described in the following description, and part of them become obvious from the description, or understood by implementing the present disclosure. The objectives and other advantages of the present disclosure can be realized and obtained through the structures specifically pointed out in the specification, claims and drawings.

BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly describe the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required in the description of the embodiments:

FIG. 1 is a schematic structural diagram illustrating a firmware according to a specific embodiment of a use of the phase change material of the present disclosure;

FIG. 2 is a schematic plan view illustrating a filter plate with holes according to a specific embodiment of the present disclosure;

FIG. 3 is a schematic flow diagram illustrating the method for preparing the phase change material according to a specific embodiment of the present disclosure.

DESCRIPTION OF EMBODIMENTS

[0033] The implementation of the present disclosure will be described in detail below with reference to the accompanying drawings and embodiments, so as to fully understand how the present disclosure applies technical means to solve technical problems and achieve the realization process of technical effects and implement them accordingly. It should be noted that, as long as there is no conflict, each embodiment of the present disclosure and each feature in each embodiment can be combined with one another, and the technical solutions formed are all within the protection scope of the present disclosure.

[0034] In one aspect, the phase change material provided by the present disclosure may include at least two of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol, and polycaprolactone.

[0035] In a specific embodiment, the phase change material may be doped with aluminum powder.

[0036] In a specific embodiment, based on the total weight of the phase change material, the content of aluminum powder may be 0.001% to 0.1% by weight. Among them, the heat storage coefficient of aluminum powder may be 191 w/(m²·K). The thermal conductivity of aluminum powder may be 237 w/(m·K). The thermal conductivity and heat storage performance are good.

[0037] In a specific embodiment, the median diameter of aluminum powder particles may be 5-100 microns (D50, the particle size corresponding to when the cumulative particle size distribution percentage of aluminum powder particles reaches 50%).

[0038] In a specific embodiment, based on the total weight of the phase change material, the content of polylactic acid may be 5% to 75% by weight.

[0039] In a specific embodiment, based on the total weight of the phase change material, the content of polyethylene lactide may be 2% to 75% by weight.

[0040] In a specific embodiment, based on the total weight of the phase change material, the content of polyglycolide may be 2% to 75% by weight.

[0041] In a specific embodiment, based on the total weight of the phase change material, the content of polyethylene may be 3% to 85% by weight.

[0042] In a specific embodiment, based on the total weight of the phase change material, the content of polypropylene may be 5% to 85% by weight.

[0043] In a specific embodiment, based on the total weight of the phase change material, the content of polyvinyl alcohol may be 5% to 65% by weight.

[0044] In a specific embodiment, based on the total weight of the phase change material, The fat content may be 5% to 65% by weight.

[0045] In a specific embodiment, the glass transition temperature of the phase change material may be 47-57°C (degrees Celsius).

[0046] In a specific embodiment, the heat storage coefficient of the phase change material may be 1 to 4 w/(m²·K) (watts/square meter-degree).

[0047] In a specific embodiment, the thermal conductivity of the phase change material may be 0.1 to 0.337 w/(m-K) (watts/meter-degree).

[0048] The phase change material of the present disclosure has a low glass transition temperature, high cooling efficiency, and good thermal conductivity and heat storage performance.

[0049] In the other aspect, the method for preparing the phase change material provided by the present disclosure may include the following steps: mixing at least two of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol, and polycaprolactone.

[0050] In a specific embodiment, according to actual needs, the mixing of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol and polycaprolactone can be performed in any order.

[0051] In a specific embodiment, according to actual needs, any two or more of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol and polycaprolactone may be selected to mix and form a phase change material. Thereby the mixture is made to have the desired physical properties. For example, phase change materials have the advantages of low glass transition temperature and high cooling efficiency.

[0052] In a specific embodiment, as shown in FIG. 1, at least two of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol and polycaprolactone are mixed, and then the resultant mixture is doped with aluminum powder. Thereby the mixture is made to have the desired physical properties. For example, phase change materials have the advantages of low glass transition temperature, high cooling efficiency, and good thermal conductivity and heat storage performance.

[0053] The method for preparing the phase change material of the present disclosure is simple and efficient, and does not require investment in complicated processes and equipment.

[0054] In another aspect, the present disclosure provides a use of the above-mentioned phase change material according to the present disclosure and the phase change material prepared according to the above-mentioned method of the present disclosure for the filter tip used for preparing a new type of tobacco product.

[0055] In a specific embodiment, the filter tip may include a film cooling section, and the film cooling section may include a filter rod formed with a film by a paper rod process.

[0056] In a specific embodiment, the film may be made of a phase change material.

[0057] In a specific embodiment, the thickness of the film may be 20-60 µm (micrometers).

[0058] In a specific embodiment, the filter tip may include a firmware cooling section, the firmware cooling section may include a firmware 1, the firmware may include a housing 11 with two hollow ends, and two filter plates 12 with holes may be provided at intervals inside the housing 11 (as shown in Figure 1, Figure 2).

[0059] In a specific embodiment, all the housing 11 and the two filter plates 12 with holes may be made of phase change materials.

[0060] In a specific embodiment, as shown in FIGS. 1 and 2, there are a plurality of vent holes 2 in the two filter plates 12 with holes, such that the cooling effect can improved.

[0061] In a specific embodiment, as shown in FIG. 2, a plurality of vent holes 2 on the two filter plates 12 with holes may be provided at equal intervals along the circumferential direction.

[0062] In a specific embodiment, the low-temperature cigarette smoke temperature of the filter tip may be lower than that of the filter tip made of polylactic acid material.

[0063] In a specific embodiment, the temperature of the side surface where the filter tip is in contact with lips may be lower than that of the filter tip made of polylactic acid material.

[0064] In a specific embodiment, the new tobacco product may be a low-temperature cigarette.

[0065] The phase change material of the present disclosure has a wide range of uses and good safety.

[0066] On the basis of the above-mentioned phase change material, the present application provides a filter tip. The filter tip may include a first hollow rod section close to the shredded tobacco section and a first acetate rod section close to the mouth. A film cooling section may be provided between the first hollow rod section and the first acetate rod section, and the film cooling section includes a filter rod formed by the film in a paper rod process, and the film may be made of a phase change material.

[0067] On the basis of the above-mentioned filter tip, the present disclosure also provides a filter tip. The filter tip may include a second hollow rod section close to the shredded tobacco section and a second acetate rod section close to the mouth. A firmware cooling section may be provided between the second hollow rod section and the second acetate rod section. The firmware cooling section may include a firmware 1 (as shown in Figures 1 and 2). The firmware 1 may include a housing 11 with two hollow ends. Two perforated filter plates 12 may be provided at intervals inside the housing 11. All the housing 11 and the two perforated filter plates 12 may be made of phase change materials.

[0068] Four specific embodiments are listed below.

Embodiment One

[0069] In the phase change material in this embodiment, the content of polylactic acid (PLA) is 55% by weight, the content of polyglycol lactide (PLGA) is 2% by weight, and the content of polyethylene (PE) is 18% by weight, the content of polyvinyl alcohol (PVA) is 15% by weight, and the content of polycaprolactone (PCL) is 10% by weight.

[0070] Further, the glass transition temperature of the phase change material is 52 °C.

[0071] Further, a phase change material is used to prepare a film with a thickness of 40 microns, and the film is prepared, according to the paper rod process, to the film cooling section of the filter tip.

[0072] Among them, the smoke temperature of low-temperature cigarettes of the filter tip with the film cooling section, compared with a filter tip with a polylactic acid film cooling section, is lowered by 1.8 °C. Compared with a filter tip with a polylactic acid film cooling section, the filter tip with the film cooling section has a temperature drop of 1.3 °C on the side surface (10 mm from the end of the filter tip) where the filter tip is in contact with the lips.

Embodiment Two

[0073] In the phase change material of this embodiment, the content of polylactic acid (PLA) is 35% by weight, the content of polyglycolide lactide (PLGA) is 12% by weight, the content of polyethylene (PE) is 10% by weight, the content of polyvinyl alcohol (PVA) is 10% by weight, and the content of polycaprolactone (PCL) is 33% by weight.

[0074] Further, the glass transition temperature of the phase change material is 48 °C.

[0075] Further, a phase change material is used to prepare the firmware 1. The firmware 1 includes a housing 11 with two hollow ends, and two perforated filter plates 12 are provided at intervals inside the housing 11 (as shown in FIG. 1 and FIG. 2).

[0076] Further, the firmware is used to prepare the firmware cooling section of the filter tip.

[0077] Among them, the smoke temperature of low-temperature cigarettes of the filter tip with the firmware cooling section, compared with a filter tip with a polylactic acid film cooling section, is lowered by 2.5 °C. Compared with a filter tip with a polylactic acid film cooling section, the filter tip with the firmware cooling section has a temperature drop of 2.3 °C on the side surface (10 mm from the end of the filter tip) where the filter tip is in contact with the lips.

Embodiment Three

[0078] In the phase change material in this embodiment, the content of polylactic acid (PLA) is 55% by weight, the content of polyglycol lactide (PLGA) is 2% by weight, the content of polyethylene (PE) is 18% by weight, the content of polyvinyl alcohol (PVA) is 15% by weight, and the content of polycaprolactone (PCL) is 10% by weight.

[0079] Further, in the phase change material, 0.01% by weight of aluminum powder is doped.

[0080] Further, the aluminum powder particle size is 20 microns (D50 diameter).

[0081] Further, the glass transition temperature of the phase change material is 52 °C, the heat storage coefficient is 1.2 w/(m²·K), and the thermal conductivity is 0.213 w/(m·K).

[0082] Further, a phase change material is used to prepare a film with a thickness of 40 microns, and the film is prepared, according to the paper rod process, to the film cooling section of the filter tip.

[0083] Among them, the smoke temperature of low-temperature cigarettes of the filter tip with a film cooling section, compared with a filter tip with a polylactic acid film cooling section, is lowered by 2.5 °C. Compared with a filter tip with a polylactic acid film cooling section, the filter tip with a film cooling section has a temperature drop of 1.8 °C on the side surface (10 mm from the end of the filter tip) where the filter tip is in contact with the lips.

Embodiment Four

[0084] In the phase change material in this embodiment, the content of polylactic acid (PLA) is 35% by weight, the content of polyglycol lactide (PLGA) is 12% by weight, the content of polyethylene (PE) is 10% by weight, the content of polyvinyl alcohol (PVA) is 10% by weight, and the content of polycaprolactone (PCL) is 33% by weight.

[0085] Further, in the phase change material, 0.03% by weight of aluminum powder is doped.

[0086] Further, the aluminum powder particle size is 20 microns (D50 diameter).

[0087] Further, the glass transition temperature of the phase change material is 48 °C, the heat storage coefficient is 3.2 w/(m²·K), and the thermal conductivity is 0.153 w/(m·K).

[0088] Further, a phase change material is used to prepare the firmware 1. The firmware 1 includes a housing 11 with hollow ends, and two perforated filter plates 12 are provided at intervals in the housing 11 (as shown in FIGS. 1 and 2).

[0089] Further, the firmware is used to prepare the firmware cooling section of the filter tip.

[0090] Among them, the smoke temperature of low-temperature cigarettes of the filter tip with the firmware cooling section, compared with a filter tip with a polylactic acid film cooling section, is lowered by 3.8 °C. Compared with a filter tip with a polylactic acid film cooling section, the filter tip with the firmware cooling section has a temperature drop of 3.2 °C on the side surface (10 mm from the end of the filter tip) where the filter tip is in contact with the lips.

[0091] Although the disclosed embodiments of the present disclosure are as described above, the content described is only the embodiments used to facilitate the understanding of the present disclosure, and is not intended to limit the present disclosure. Any person skilled in the technical field of the present disclosure can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope of the present disclosure. However, the patent protection scope of the present disclosure is still subject to the scope defined by the appended claims.

Claims

1. A phase change material, comprising at least two of polylactic acid, polyvinyl-lactide, polyglycolide, polyethylene, polypropylene, polyvinyl alcohol, and polycaprolactone.

2. The phase change material according to claim 1, wherein the phase change material is doped with aluminum powder.

3. The phase change material according to claim 2, wherein a content of the aluminum powder is 0.001% to 0.1% by weight based on a total weight of the phase change material.

4. The phase change material according to claim 2 or 3, wherein a particle of the aluminum powder has a median diameter of 5 to 100 microns.

5. The phase change material according to claim 1 or 2, wherein a content of the polylactic acid is 5% to 75% by weight based on the total weight of the phase change material.

6. The phase change material according to claim 5, wherein a content of the polyethylene lactide is 2% to 75% by weight based on the total weight of the phase change material.

7. The phase change material according to claim 6, wherein a content of the polyglycolide is 2% to 75% by weight based on the total weight of the phase change material.

8. The phase change material according to claim 7, wherein a content of the polyethylene is 3% to 85% by weight based on the total weight of the phase change material.

9. The phase change material according to claim 8, wherein a content of the polypropylene is 5% to 85% by weight based on the total weight of the phase change material.

10. The phase change material according to claim 9, wherein a content of the polyvinyl alcohol is 5% to 65% by weight based on the total weight of the phase change material.

11. The phase change material according to claim 10, wherein a content of the polycaprolactone is 5% to 65% by weight based on the total weight of the phase change material.

12. The phase change material according to claim 1, wherein the phase change material has a glass transition temperature of 47∼57 °C.

13. The phase change material according to claim 2, wherein the phase change material has a heat storage coefficient of 1∼4 w/(m²·K), and the phase change material has a thermal conductivity of 0.1-0.337 w/(m-K).

14. A method for preparing the phase change material according to any one of claims 1 to 13, comprising the following steps: mixing at least two of the polylactic acid, the polyethylene-lactide, the polyethylene, the lyophilized resin, the polyethylene, the polypropylene, the polyvinyl alcohol, and the polycaprolactone to form the phase change material.

15. Use of the phase change material according to any one of claims 1 to 13 and the method for preparing the phase change material according to claim 14 in a filter tip for a novel tobacco product.

16. The use according to claim 15, wherein the filter tip comprises a film cooling section; the film cooling section comprises a filter rod formed by a film in a paper rod process.

17. The use according to claim 16, wherein the film is made of the phase change material.

18. The use according to claim 17, wherein the film has a thickness of 20∼60 microns.

19. The use according to claim 15, wherein the filter tip comprises a firmware cooling section; the firmware cooling section comprises a firmware, and the firmware comprises a housing with two hollow ends, the housing is provided with two filter plates with holes at intervals inside the housing.

20. The use according to claim 19, wherein the housing and the two filter plates with holes are all made of the phase change material.

21. The use according to claim 15, wherein a low-temperature cigarette smoke temperature of the filter tip is lower than a low-temperature cigarette smoke temperature of the filter tip made of polylactic acid material.

22. The use according to claim 15, wherein a temperature of a side surface where the filter tip is in contact with lips is lower than a temperature of a side surface where the filter tip is in contact with lips made of polylactic acid material.

23. A filter tip, wherein the filter tip comprises a first hollow rod section close to a shredded tobacco section, and a first acetate rod section close to a mouth; a film cooling section is provided between the first hollow rod section and the first acetate rod section; the film cooling section comprises a filter rod formed by a film in a paper rod process; the film is made of the phase change material according to any one of claims 1-9 and a method for preparing the phase change material according to claim 10.

24. A filter tip, wherein the filter tip comprises a second hollow rod section close to a shredded tobacco section, and a second acetate rod section close to a mouth; a firmware cooling section is provided between the second hollow rod section and the second acetate rod section; the firmware cooling section comprises a firmware, the firmware comprises a housing with two hollow ends, the housing is provided with two filter plates with holes at intervals inside the housing; the housing and the two filter plates with holes are all made of the phase change material according to any one of claims 1-13 and the method for preparing the phase change material according to claim 10.

Drawing