Temperature response material capable of being used for heating cigarette filter stick and temperature response type cigarette filter stick

Abstract

The invention discloses a temperature response material capable of being used for heating a cigarette filter stick, which has thermal response performance, is used for preparing the cigarette filter stick and comprises a temperature response air hole, the opening or the aperture of the temperature response air hole can be changed according to the change of temperature, and in a storage state, the temperature response air hole is in a micropore or closed state; when the cigarette is smoked, hot smoke passes through the cigarette, the temperature response air holes are heated, the hole diameters of the temperature response air holes are expanded, more air is introduced to be mixed with hot air flow, and the effects of reducing the smoke temperature and reducing suction resistance are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of heated cigarettes, and more specifically, to a temperature-responsive material and a temperature-responsive cigarette filter rod that can be used to heat a cigarette filter rod. Background Art

[0002] Due to the unique heating mechanism and aerosol composition of heated cigarettes, the aerosol temperature of heated cigarettes is prone to being too high, which greatly affects the consumer's smoking experience. Heated cigarettes mostly use multi-segment composite filter rods, which take into account both smoke filtration and cooling functions. At present, the common way to reduce the aerosol temperature is the filter rod cooling technology, which is achieved by adding cooling materials with heat absorption, heat storage, and heat conduction functions to the filter rod, or designing a special cooling structure to enhance the heat exchange between the airflow and the filter rod, or combining the two to further improve the cooling effect. Although there are many ways to achieve filter rod cooling and filter rod reduction of draw resistance, the technical analysis of heated cigarettes at home and abroad is still mainly based on structure and materials. The simplest solution is to add cooling materials to cigarettes to achieve the transfer of heat and heat-containing substances. However, the application of cooling materials in the mouthpiece is limited by the length of the cigarette, and the use of existing cooling materials requires overcoming high patent risks. Compared with material cooling, simple structural cooling has the advantages of high safety factor and low production cost, but the more complex structure often has higher requirements on filter rod processing technology and equipment. In addition, it may also lead to reduced production efficiency. Summary of the invention

[0003] To solve the above technical problems, the present invention provides a temperature responsive material that can be used to heat cigarette filter rods. The prepared cigarette filter rods have temperature responsive pores that can change the opening or closing of the pores or the size of the pores according to changes in temperature.

[0004] Furthermore, the present invention also provides a temperature-responsive cigarette filter rod prepared using the temperature-responsive material.

[0005] A temperature-responsive material that can be used to heat a cigarette filter rod is prepared by the following method: Weigh 100 g of N-isopropylacrylamide (NIPAM) powder and dissolve it in 500 mL of deionized water, stir evenly to obtain a NIPAM solution, stir the NIPAM solution and heat it to 70°C, introduce nitrogen, add appropriate amounts of cross-linking agent and initiator to initiate the polymerization reaction, and the reaction lasts for 8-12 hours. After the reaction is completed, cool to room temperature and freeze-dry to obtain a powdery material.

[0006] Wherein, the initiator is any one of potassium persulfate, ammonium persulfate, azobisisobutyronitrile and benzoyl peroxide.

[0007] Wherein, the ratio of the initiator is 3%-10% of N-isopropylacrylamide.

[0008] Wherein, the cross-linking agent is N,N'-methylenebisacrylamide (MBA).

[0009] Wherein, the proportion of the cross-linking agent is 10%-30% of N-isopropylacrylamide.

[0010] A temperature-responsive cigarette filter rod is made by wrapping a filter element with packaging paper. The filter element comprises a supporting section, a cooling section and a acetate section; The support segment and / or acetate segment is obtained by dissolving, filtering, spinning and other processes the temperature-responsive material that can be used to heat cigarette filter rods as described above and cellulose acetate into fibers, and then making filter rod tows, which are then wrapped; or The temperature-lowering section is made by coating and impregnating the temperature-responsive material that can be used to heat cigarette filter rods as described above on the inner wall of the temperature-lowering section paper tube.

[0011] Wherein, the support segment and / or acetate segment are prepared by the following method: The temperature responsive material obtained as described above is added to cellulose acetate, with a weight ratio of the temperature responsive material to cellulose acetate being 1:1.5, and then made into fibers through processes such as dissolution, filtration, and spinning. Multiple fibers are then bundled together, and subjected to treatments such as curling and drying to obtain a filter rod tow, which is then wrapped to obtain the support segment and / or acetate segment of the filter element.

[0012] Wherein, the temperature reduction section is prepared by the following method: The temperature responsive material obtained as described above is dissolved in water or ethanol to obtain a mixed solution, wherein the weight ratio of the temperature responsive material to water or ethanol is 30%-70%. The mixed solution is evenly applied to the inner wall surface of the paper tube of the cooling section 3 by coating or impregnation, and the cooling section of the filter element is obtained after drying.

[0013] Wherein, the temperature-responsive cigarette filter rod comprises temperature-responsive pores, and the diameter of the temperature-responsive pores is 30-300 μm.

[0014] Wherein, the temperature response interval of the temperature-responsive pore material is 40°C-100°C.

[0015] Compared with the prior art, the present invention provides a temperature-responsive material that can be used to heat cigarette filter rods. The material has thermal response properties and is used to prepare cigarette filter rods, including temperature-responsive pores. The temperature-responsive pores can change the opening or closing of the pores or the size of the pores according to changes in temperature. In the storage state, the temperature-responsive pores are in a microporous or closed state, which slows down the moisture absorption of the cigarette. When inhaling, hot smoke passes through, and the temperature-responsive pores are heated and expanded, introducing more air to mix with the hot air flow, thereby lowering the smoke temperature and reducing the inhalation resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of a cigarette filter rod in the prior art; Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention; In the figure, there are tobacco segment 1, support segment 2, cooling segment 3, and acetate segment 4. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0023] In order to better illustrate the concept of the present invention, several specific embodiments are provided below.

[0024] Example 1 like Figure 2 As shown, a temperature-responsive cigarette filter rod is made by wrapping a filter element with packaging paper, the filter element includes a support section 2, a cooling section 3 and a acetate section 4, wherein the cooling section 3 is made of a temperature-responsive pore material, the temperature-responsive pore material includes a plurality of temperature-responsive pores that can adjust the aperture according to temperature changes, the temperature-responsive pores can change the opening and closing state according to the temperature change, and the ventilation volume can be adjusted. The cooling section 3 of this embodiment is made by the following method: 100 g of N-isopropylacrylamide (NIPAM) powder was weighed and dissolved in 500 mL of deionized water, and stirred evenly to obtain a NIPAM solution of a certain concentration. The NIPAM solution was stirred and heated to 70°C, and nitrogen was introduced. 20 g of cross-linking agent N,N'-methylenebisacrylamide and 5 g of initiator potassium persulfate were added to initiate the polymerization reaction. The reaction lasted for 10 hours. After the reaction was completed, the temperature was cooled to room temperature and freeze-dried to obtain a temperature-responsive porous material. The obtained powdered temperature-responsive porous material is dissolved in solvent ethanol to obtain a mixed solution, wherein the ratio of the temperature-responsive porous material to the ethanol is 30%. The mixed solution is evenly applied to the inner wall surface of the paper tube of the cooling section 3 by coating, impregnation, etc., to obtain a cooling section 3 with temperature-responsive pores.

[0025] The diameter of the temperature-responsive pores of the material prepared above is 30-300 μm, and the temperature response range of the temperature-responsive pore material is 40° C.-100° C.

[0026] The temperature-responsive cigarette filter rod of the embodiment 1 has a plurality of temperature-responsive pores on the cooling section 3, which can change the opening and closing state according to the temperature change. When the tobacco section 1 is not heated, the temperature is relatively low and the temperature-responsive pores 2 are in a closed state; Figure 2 As shown, when the tobacco segment 1 is heated, the aerosol generated by the tobacco segment 1 enters the temperature-responsive cigarette filter rod, the temperature-responsive pores of the cooling segment 3 open, and the convection between the smoke and the surrounding environment increases when the smoke passes through, which is beneficial to the dissipation of heat from the smoke.

[0027] The diameter of the temperature-responsive pores in the prepared material is 30-300 μm, and the temperature response range of the temperature-responsive pore material is 40° C.-100° C.

[0028] When the temperature is less than 40°C, the pores 2 are relatively small, at the micron level. When the temperature rises above 40°C and lasts for a period of time, the pores open, which is beneficial to heat exchange and increased ventilation. As the suction proceeds, more airflow can be introduced through the temperature-responsive pores, which can effectively reduce the temperature and increase the ventilation volume.

[0029] Example 2 like Figure 3 As shown, a temperature-responsive cigarette filter rod is made by wrapping a filter element with packaging paper, the filter element includes a support section 2, a cooling section 3 and a acetate section 4, wherein the middle portion of the support section 2 is made of a temperature-responsive pore material, the temperature-responsive pore material includes a plurality of temperature-responsive pores whose apertures can be adjusted according to temperature changes, the temperature-responsive pores can change their opening and closing states according to temperature changes, and the ventilation volume can be adjusted. The support section 2 of this embodiment is made by the following method: 100 g of N-isopropylacrylamide (NIPAM) powder was weighed and dissolved in 500 mL of deionized water, and stirred evenly to obtain a NIPAM solution of a certain concentration. The NIPAM solution was stirred and heated to 70°C, and nitrogen was introduced. 10 g of cross-linking agent N,N'-methylenebisacrylamide and 3 g of initiator potassium persulfate were added to initiate the polymerization reaction. The reaction lasted for 12 hours. After the reaction was completed, the temperature was cooled to room temperature and freeze-dried to obtain a temperature-responsive pore material. The obtained temperature-responsive porous material is added to cellulose acetate in a certain proportion, that is, the weight ratio of the temperature-responsive porous material to cellulose acetate is 1:1.5, and then made into fibers through dissolution, filtration, spinning and other processes, and then multiple fibers are bundled together, and after curling, drying, molding and other treatments, a filter rod tow is obtained.

[0030] The diameter of the temperature-responsive pores in the prepared material is 30-300 μm, and the temperature response range of the temperature-responsive pore material is 40° C.-100° C.

[0031] When the temperature is lower than 40°C, the pores in the temperature-responsive porous material are closed or microporous. When the temperature rises to greater than 40°C, the temperature-responsive pores open and expand due to heat, and more smoke passes through the middle part of the support section 2, thereby lowering the smoke temperature and reducing the inhalation resistance.

[0032] Example 3 like Figure 4 As shown, a temperature-responsive cigarette filter rod is made by wrapping a filter element with packaging paper, the filter element includes a support section 2, a cooling section 3 and a acetate section 4, wherein the acetate section 4 is made of a temperature-responsive pore material, the temperature-responsive pore material includes a plurality of temperature-responsive pores capable of adjusting the aperture according to temperature changes, the temperature-responsive pores can change the opening and closing state according to the temperature change, and the ventilation volume can be adjusted. The acetate section 4 of this embodiment is made by the following method: 100 g of N-isopropylacrylamide (NIPAM) powder was weighed and dissolved in 500 mL of deionized water, and stirred evenly to obtain a NIPAM solution of a certain concentration. The NIPAM solution was stirred and heated to 70°C, and nitrogen was introduced. 30 g of cross-linking agent N,N'-methylenebisacrylamide and 10 g of initiator potassium persulfate were added to initiate the polymerization reaction. The reaction lasted for 8 hours. After the reaction was completed, the temperature was cooled to room temperature and freeze-dried to obtain a temperature-responsive pore material. The obtained temperature-responsive porous material is added to cellulose acetate in a certain proportion, that is, the weight ratio of the temperature-responsive porous material to cellulose acetate is 1:1.5, and then made into fibers through dissolution, filtration, spinning and other processes, and then multiple fibers are bundled together, and after curling, drying, molding and other treatments, a filter rod tow is obtained.

[0033] The diameter of the temperature-responsive pores of the material is 30-300 μm, and the temperature response range of the temperature-responsive pore material is 40° C.-60° C.

[0034] When the temperature is lower than 40°C, the pores in the temperature-responsive porous material are closed or microporous. When the temperature rises to greater than 40°C, the temperature-responsive pores open and expand due to heat, and more gas flows through the acetate segment 4 and enters the oral cavity, thereby lowering the smoke temperature and reducing the inhalation resistance.

[0035] Comparative Example 1 An ordinary cigarette filter rod, whose filter element support section 2, cooling section 3 and acetate section 4, compared with Example 1, the inner wall of the paper tube of the cooling section 3 is not coated or impregnated, and compared with Examples 2 and 3, the support section 2 and the acetate section 4 are made of ordinary tow (does not contain temperature responsive materials), and the other conditions are the same.

[0036] The filter rods described in Examples 1-3 and Comparative Example 1 were used to prepare cigarettes. The draw resistance of the prepared cigarettes was measured using a draw resistance detector, and the outlet aerosol temperature was measured using a thermocouple method. The results are as follows:

[0037] It can be seen from the above table that the cigarette prepared by the filter rod of the present invention has significantly reduced draw resistance, which is beneficial to improving the smoking experience of the cigarette.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature-responsive material that can be used to heat a cigarette filter rod, characterized in that Prepared by the following method: Weigh 100 g of N-isopropylacrylamide powder and dissolve it in 500 mL of deionized water, stir evenly to obtain a NIPAM solution, stir the NIPAM solution and heat it to 70°C, introduce nitrogen, add appropriate amounts of cross-linking agent and initiator to initiate the polymerization reaction, and the reaction lasts for 8-12 hours. After the reaction is completed, cool to room temperature and freeze-dry to obtain a powdery material.

2. The temperature-responsive material for heating a cigarette filter rod according to claim 1, characterized in that: The initiator is any one of potassium persulfate, ammonium persulfate, azobisisobutyronitrile and benzoyl peroxide.

3. The temperature-responsive material for heating a cigarette filter rod according to claim 2, characterized in that: The ratio of the initiator is 3%-10% of N-isopropylacrylamide.

4. The temperature-responsive material for heating a cigarette filter rod according to claim 1, characterized in that: The cross-linking agent is N,N'-methylenebisacrylamide.

5. The temperature-responsive material for heating a cigarette filter rod according to claim 4, characterized in that: The ratio of the cross-linking agent is 10%-30% of N-isopropylacrylamide.

6. A temperature-responsive cigarette filter rod, made by wrapping a filter element with packaging paper, characterized in that: The filter element comprises a supporting section (2), a cooling section (3) and a acetate section (4); The support segment (2) and / or the acetate segment (4) are obtained by dissolving, filtering, spinning, etc. the temperature-responsive material for heating a cigarette filter rod according to any one of claims 1 to 5 and cellulose acetate to make fibers, and then making filter rod tow, and then wrapping; or The temperature-reducing section (3) is prepared by coating or impregnating the temperature-responsive material for heating cigarette filter rods according to any one of claims 1 to 5 on the inner wall of the paper tube of the temperature-reducing section (3).

7. The temperature-responsive cigarette filter rod according to claim 6, characterized in that: The support segment (2) and / or the acetate segment (4) are prepared by the following method: The temperature responsive material obtained according to any one of claims 1 to 5 is added to cellulose acetate, with a weight ratio of the temperature responsive material to cellulose acetate being 1:1.5, and then fibers are made through processes such as dissolution, filtration, and spinning, and then a plurality of fibers are bundled together, and after curling, drying, and molding, a filter rod tow is obtained, and after wrapping, a support segment (2) and / or a cellulose acetate segment (4) of a filter element is obtained.

8. The temperature-responsive cigarette filter rod according to claim 6, characterized in that: The temperature reduction section (3) is prepared by the following method: The temperature responsive material obtained according to any one of claims 1 to 5 is dissolved in water or ethanol to obtain a mixed solution, wherein the weight ratio of the temperature responsive material to the water or ethanol is 30% to 70%. The mixed solution is evenly applied to the inner wall surface of the paper tube of the cooling section (3) by coating or impregnation, and the cooling section (3) of the filter element is obtained after drying.

9. The temperature-responsive cigarette filter rod according to claim 7 or 8, characterized in that: The temperature-responsive cigarette filter rod comprises temperature-responsive pores, and the diameter of the temperature-responsive pores is 30-300 μm.

10. The temperature-responsive cigarette filter rod according to claim 9, characterized in that: The temperature response interval of the temperature-responsive pore material is 40°C-100°C.

Images