Membrane material-based central hollow pipe for heating cigarette and preparation method of membrane material-based central hollow pipe

Abstract

The invention discloses a membrane material-based central hollow pipe for heating cigarettes and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing starch glue, MgO and a plasticizer in proportion, then adding water into the mixture, and uniformly mixing to obtain slurry; coating the slurry on the inner wall and / or the outer wall of the membrane type central hollow pipe; and drying to obtain the product. The starch glue is a natural adhesive prepared by taking starch as a raw material, and the inventor finds that the heat-conducting coating prepared by mixing the starch glue and MgO according to a set proportion has good adhesion on the surface of a membrane type central hollow tube and has good heat-conducting property through experiments. And meanwhile, the stiffness of the membrane type central hollow pipe is improved well.

Description

Technical Field

[0001] The present invention belongs to the technical field of heated cigarettes, and in particular relates to a central hollow tube for heated cigarettes based on membrane materials and a preparation method thereof. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Central resistance heating cigarettes use built-in electric heating elements to directly insert into the tobacco segment for heating. In order to prevent the tobacco slices from carbonizing and adhering to the surface of the heating element after heating, a high-temperature resistant insulation layer is used to wrap the heating element to reduce the pollution caused by direct contact with the tobacco material. The high-temperature resistant insulation layer is generally an inorganic fiber hose or a membrane-type central hollow tube. Among them, although the membrane material such as aluminum foil and tin foil has good thermal conductivity, its stiffness is poor and it is easy to deform during the base rod rolling process, which hinders the smooth insertion of the heating element. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a central hollow tube for heated cigarettes based on membrane materials and a preparation method thereof.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides a central hollow tube for a heated cigarette based on a membrane material, comprising a central hollow tube substrate and a thermally conductive coating, wherein the thermally conductive coating is disposed on the inner wall and / or outer wall of the central hollow tube substrate; the central hollow tube substrate is a membrane-based central hollow tube; The thermal conductive coating comprises starch glue and thermal conductive filler, and the mass ratio of starch glue to thermal conductive filler is 100:1-10.

[0006] In order to solve the problem of poor stiffness of the central hollow tube of the membrane, the inventor tried to apply a layer of glue on the surface or inner wall of the central hollow tube of the membrane to improve its stiffness. However, the thermal conductivity of this type of glue in the existing technology is poor, which hinders the efficient transfer of heat, aggravates the uneven heating of the tobacco segment, and is not conducive to the effective release of smoke.

[0007] In addition, tobacco is smoked by the human body, so it requires a relatively food grade. Therefore, the base of the glue is set as starch glue, which uses natural glutinous rice starch as the main raw material. It is a white viscous colloid with high bonding strength, fast drying time, stable performance, safety and non-toxicity.

[0008] The central hollow tube is prepared by using film materials to achieve the cleaning-free effect of the inner core heated cigarette; by applying starch glue, the stiffness of the central hollow tube of the film can be improved, preventing the central hollow tube of the film from deforming during the base rod rolling process, so as to ensure the smooth insertion of the heating element.

[0009] By adding thermally conductive fillers to the starch glue matrix, the thermal conductivity of the coating can be effectively improved to ensure efficient heat transfer.

[0010] In some embodiments, the thermally conductive filler is metal particles, metal oxide particles, ceramic nitride particles, or carbon particles.

[0011] Preferably, the metal particles are copper particles or aluminum particles; the metal oxide particles are aluminum oxide particles or magnesium oxide particles; The ceramic nitride particles are aluminum nitride particles or silicon nitride particles; The carbon particles are graphene or carbon nanotubes.

[0012] In some embodiments, the thickness of the thermal conductive coating is 0.1-0.5 mm.

[0013] In some embodiments, the material of the membrane-type central hollow tube is aluminum foil, tin foil, paper-covered aluminum foil or paper-covered tin foil.

[0014] Preferably, the thickness of the central hollow tube of the membrane is 0.05-0.45 mm, and the ratio of the cross-sectional area of ​​the central hollow tube to the smoke-generating section is 0.4-0.85.

[0015] In a second aspect, the present invention provides a method for preparing the central hollow tube for a heated cigarette based on a membrane material, comprising the following steps: Mix starch glue and water in a mass ratio of 1:4-6, then add thermal conductive filler and mix well to obtain slurry; The slurry is applied to the inner wall and / or outer wall of the central hollow tube of the membrane and dried to obtain the membrane.

[0016] In some embodiments, the method of coating the slurry on the outer wall of the membrane-type central hollow tube is spraying.

[0017] In some embodiments, the mass ratio of starch glue to thermal conductive filler is 100:1-10.

[0018] The beneficial effects achieved by one or more embodiments of the present invention are as follows: Starch glue is a natural adhesive made from starch. The inventors have found through experiments that the thermally conductive coating prepared by mixing starch glue and thermally conductive filler in a set proportion has good adhesion on the surface of the central hollow tube of the membrane and has good thermal conductivity. At the same time, it plays a good role in promoting the improvement of the stiffness of the central hollow tube of the membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A diagram showing a method for preparing a central hollow tube for heated cigarettes based on membrane materials. DETAILED DESCRIPTION

[0020] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Example 1 The method for preparing a central hollow tube for a heated cigarette based on a membrane material comprises the following steps: Mix starch glue and water in a mass ratio of 1:5 to obtain a colloid; The colloid and the thermal conductive filler are mixed evenly in a mass ratio of 20:1 to obtain a slurry; Prepare an aluminum foil central hollow tube with a thickness of 0.2 mm and an inner diameter of 0.5 mm; Coat the outer surface of the hollow tube in the center of the aluminum foil with a coating amount of 3g / cm2 per unit area. 2 After drying, a central hollow tube is obtained. The relevant properties of the central hollow tube are shown in Table 1-1.

[0023] When coatings with different conductive fillers are applied to the aluminum foil central hollow tube, the relevant properties of the obtained central hollow tube are shown in Table 1-1.

[0024] Table 1-1 Stiffness and thermal conductivity of aluminum foil composite films

[0025] As shown in Table 1-1, by applying a high-performance thermally conductive adhesive to the surface of aluminum foil to create a central hollow tube for heated cigarettes, two objectives are achieved: first, it increases the bending stiffness of the membrane material; second, it improves the thermal conductivity of the membrane material, thereby meeting the requirements of hollow heated cigarettes. Hollow heated cigarettes solve the problem of difficult cleaning of heated cigarettes.

[0026] Example 2 The difference from Example 1 is that only the aluminum foil is replaced by tin foil, and the rest is the same as Example 1.

[0027] When coatings with different thermal conductive fillers are applied to the outer surface of the tin foil central hollow tube, the relevant properties of the obtained central hollow tube are shown in Table 1-2.

[0028] Table 1-2 Stiffness and thermal conductivity of tin foil composite films

[0029] Example 3 The difference from Example 1 is that only the aluminum foil is replaced by aluminum foil paper, and the rest is the same as Example 1.

[0030] When coatings with different thermal conductive fillers are applied to the outer surface of the aluminum foil central hollow tube, the relevant properties of the obtained central hollow tube are shown in Table 1-3.

[0031] Table 1-3 Stiffness and thermal conductivity of aluminum foil composite film

[0032] Example 4 The difference from Example 1 is that only the aluminum foil is replaced by tin foil, and the rest is the same as Example 1.

[0033] When different amounts of coating are applied to the aluminum foil central hollow tube, the relevant properties of the obtained central hollow tube are shown in Table 1-4.

[0034] Table 1-4 Stiffness and thermal conductivity of tin foil composite films

[0035] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A central hollow tube for heated cigarettes based on membrane materials, characterized by: The invention comprises a central hollow tube substrate and a thermal conductive coating, wherein the thermal conductive coating is arranged on the inner wall and / or outer wall of the central hollow tube substrate; the central hollow tube substrate is a membrane-type central hollow tube; The thermal conductive coating comprises starch glue and thermal conductive filler, and the mass ratio of starch glue to thermal conductive filler is 100:1-10.

2. The central hollow tube for heated cigarettes based on membrane materials according to claim 1, characterized in that: The thermally conductive filler is metal particles, metal oxide particles, ceramic nitride particles or carbon particles.

3. The central hollow tube for heated cigarettes based on membrane materials according to claim 2, characterized in that: The metal particles are copper particles or aluminum particles; the metal oxide particles are aluminum oxide particles or magnesium oxide particles; The ceramic nitride particles are aluminum nitride particles or silicon nitride particles; The carbon particles are graphene or carbon nanotubes.

4. The central hollow tube for heated cigarettes based on membrane materials according to claim 1, characterized in that: The thickness of the thermal conductive coating is 0.1-0.5 mm.

5. The central hollow tube for heated cigarettes based on membrane materials according to claim 1, characterized in that: The material of the membrane central hollow tube is aluminum foil, tin foil, paper-covered aluminum foil or paper-covered tin foil.

6. The central hollow tube for heated cigarettes based on membrane materials according to claim 5, characterized in that: The thickness of the central hollow tube of the membrane is 0.05-0.45 mm, and the ratio of the cross-sectional area of ​​the central hollow tube to the cross-sectional area of ​​the smoke-generating section is 0.4-0.

85.

7. The method for preparing a central hollow tube for a heated cigarette based on a membrane material according to any one of claims 1 to 6, characterized in that: The steps include: Mix starch glue and water in a mass ratio of 1:4-6, then add thermal conductive filler and mix well to obtain slurry; The slurry is applied to the inner wall and / or outer wall of the central hollow tube of the membrane and dried to obtain the membrane.

8. The method for preparing a central hollow tube for a heated cigarette based on a membrane material according to claim 7, characterized in that: The method of coating the slurry on the outer wall of the central hollow tube of the membrane is spraying.

9. The method for preparing a central hollow tube for heated cigarettes based on membrane materials according to claim 7, characterized in that: The mass ratio of starch glue to thermal conductive filler is 100:1-10.

10. The method for preparing a central hollow tube for heated cigarettes based on membrane materials according to claim 9, characterized in that: The mass ratio of starch glue to thermal conductive filler is 100:2-5.

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