CN111387557A - Multilayer heat insulation material, preparation method and application thereof, and cigarette heating appliance - Google Patents

Abstract

The present invention relates to the technical field of heating cigarette consumables, in particular, to a multi-layer thermal insulation material, a preparation method and application thereof, and a heating cigarette appliance. The multi-layer thermal insulation material is used for thermal insulation when heating cigarette appliances, and includes a thermal radiation emission layer, a mirror reflection layer and a thermal insulation layer that are connected in sequence, and the radiation emissivity of the thermal radiation emission layer is 0.61-0.92, The reflectivity of the specular reflection layer is 92%-98%, and the thermal conductivity of the thermal insulation layer is 0.025-0.100W/(m·k). The multi-layer thermal insulation material can meet the requirements of high thermal insulation and high heat utilization rate of the thermal insulation material for heating cigarette appliances at the same time.

Description

Multilayer thermal insulation material, its preparation method and its application and heating cigarette appliance

technical field

The invention relates to the technical field of heating cigarette consumables, in particular, to a multi-layer thermal insulation material, a preparation method and application thereof, and a heating cigarette appliance.

Background technique

In recent years, the development trend of new tobacco products has been rapid. The reason is that, on the one hand, the health hazards caused by traditional tobacco have caused the proportion of the consumer population to decline year by year; More and more countries have enacted and promulgated strict smoking bans in public places. In this context, new types of tobacco products have emerged, and consumer demand has increased exponentially.

The new type of tobacco heats the tobacco through an external heat source instead of the traditional way of ignition, so it does not produce tar, carbon monoxide, heavy metals and other harmful substances, which greatly reduces the harm to the human body and the environment, and is highly sought after by new smokers and young consumers.

According to the types of products, new tobacco products are mainly divided into electronic cigarettes, heated cigarettes and smokeless tobacco products. Among them, heated cigarettes can produce real tobacco smell under the premise of no fire, no ash and no strong smell, so they are very popular among consumers.

For heated cigarettes, the smoking section or heating section heats the processed tobacco (special cartridge) to a certain temperature without igniting the tobacco, so that the tobacco is heated to a degree sufficient to emit smoke, and the heating temperature in this section is as high as 300 ℃ or so. While ensuring high heating efficiency, preventing heat from overflowing, thereby causing external overheating of cigarettes, has become a problem that must be considered when heating cigarettes in the smoking/heating section. Therefore, the existing technology utilizes the thermal insulation material used for thermal insulation, but the heat of the cigarette is difficult to be fully utilized due to the influence of the heating method, that is, the heat utilization rate is reduced. Therefore, the existing thermal insulation material cannot simultaneously achieve high Insulation and high heat utilization requirements.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a multi-layer thermal insulation material, its preparation method and its application, and a heating cigarette appliance. The multi-layer thermal insulation material can simultaneously meet the requirements for high thermal insulation and high heat utilization rate of the thermal insulation material for heating cigarette appliances.

The present invention is realized in this way:

In a first aspect, the embodiment provides a multi-layer thermal insulation material, which is used for thermal insulation when heating a cigarette appliance for heating cigarettes, which comprises a thermal radiation emitting layer, a specular reflection layer and a thermal insulation layer that are connected in sequence. The radiation emissivity of the radiation emission layer is 0.61-0.92, the reflectivity of the specular reflection layer is 92%-98%, and the thermal conductivity of the thermal insulation layer is 0.025-0.100W/(m·k).

In an optional embodiment, the radiation emissivity of the thermal radiation emitting layer is 0.90-0.92;

Preferably, the raw materials for forming the thermal radiation emitting layer include at least one of metal oxides, silicides, high molecular polymers and carbon-based substances;

Preferably, the metal oxide comprises a transition metal oxide;

Preferably, the transition metal oxide includes at least one of zinc oxide, zirconium dioxide, hafnium dioxide, titanium dioxide, iron oxide and chromium oxide;

Preferably, the suicide comprises at least one of silicon dioxide, silicon carbide and silicon nitride;

Preferably, the high molecular polymer comprises at least one of polyvinylpyrrolidone, polyvinyl alcohol, cellulose, polyimide, polyether ether ketone and polyphenylene sulfide;

Preferably, the carbon-based substance includes at least one of carbon black, carbon nanotubes and graphite.

In an optional embodiment, the reflectivity of the specular reflection layer is 96%-98%;

Preferably, the metal material forming the specular reflection layer includes a metal element or a metal oxide;

Preferably, the metal element includes any one of gold, silver, copper, aluminum, tin and iron;

Preferably, the metal oxide includes any one of titanium dioxide, hafnium dioxide and zinc oxide.

In an optional embodiment, the thermal conductivity of the thermal insulation layer is 0.025-0.050W/(m·k);

Preferably, the material forming the thermal insulation layer comprises aerogel;

Preferably, the aerogel-forming feedstock comprises silica.

In an optional embodiment, the thickness of the thermal radiation emitting layer is 35-78 microns;

Preferably, the thickness of the specular reflection layer is 41-86 microns;

Preferably, the thickness of the thermal insulation layer is 600-1300 microns.

In a second aspect, the embodiment provides a method for preparing a multi-layer thermal insulation material according to any one of the foregoing embodiments, comprising:

The material for forming the thermal insulation layer and the material for forming the thermal radiation emitting layer are respectively combined with the mirror surface reflection layer to form a multi-layer thermal insulation material in which the thermal radiation emission layer, the mirror surface reflection layer and the thermal insulation layer are sequentially connected.

In an optional embodiment, it includes: compounding the specular reflection layer with the material forming the thermal insulation layer to form a double-layer composite layer in which the specular reflection layer and the thermal insulation layer are connected;

Then, the double-layer composite layer is composited with the material forming the thermal radiation emission layer to form a multi-layer thermal insulation material in which the thermal radiation emission layer, the specular reflection layer and the thermal insulation layer are sequentially connected;

Preferably, the preparation of the specular reflection layer comprises: treating the metal material under a pressure of 10-20 MPa for 10-20 minutes to form the specular reflection layer;

Preferably, the preparation step of the double-layer composite layer includes: coating one side of the specular reflection layer with an adhesive, and then coating the material for forming the thermal insulation layer, and under a pressure of 1-2 MPa Process for 10-20 minutes.

In an optional embodiment, the step of compounding the double-layer composite layer with the material for forming the heat radiation emitting layer includes: coating a side of the specular reflective layer that is relatively far away from the thermal insulation layer to form the thermal radiation emitting layer. The material of the heat radiation emitting layer is used to form the multi-layer thermal insulation material.

In a third aspect, the embodiment provides a heating cigarette appliance, which includes a accommodating tube for accommodating cigarettes and the multi-layer thermal insulation material according to any one of the foregoing embodiments, wherein the multi-layer thermal insulation material is arranged in the above accommodating tube ;

Preferably, the heating cigarette appliance further comprises a heating sheet for heating the cigarette and a heater base, a accommodating cavity for accommodating the cigarette is arranged in the accommodating tube, the heating sheet is arranged in the accommodating cavity, and is connected with the heater base, and one end of the accommodating tube is connected with the heater base.

In a third aspect, the embodiment provides an application of the multi-layer thermal insulation material according to any one of the preceding embodiments in a heating cigarette appliance;

Preferably, the application is for thermal insulation when heating cigarette appliances for heating cigarettes.

The present invention has the following beneficial effects: the present invention adopts the thermal radiation emission layer, the specular reflection layer and the thermal insulation layer which are connected in sequence and respectively defines the reflectivity and thermal conductivity of each layer, so that the multi-layer thermal insulation material has good thermal insulation properties. The thermal effect, at the same time, enables the heat generated by heating the cigarette to be fully utilized.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a multi-layer thermal insulation material provided in Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of the heating cigarette appliance provided in Example 7 of the present invention.

Illustration: 100-multi-layer insulation material; 101-heat radiation emission layer; 102-mirror reflection layer; 103-thermal insulation layer; 200-heated cigarette appliance; 201-accommodating tube; device base; 204-accommodating cavity.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not indicated in the examples, it is carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used without the manufacturer's indication are conventional products that can be purchased from the market.

The features and performances of the present invention will be further described in detail below in conjunction with the embodiments.

This embodiment provides a multi-layer thermal insulation material, which is used for thermal insulation when heating a cigarette appliance for heating cigarettes. It is ensured that the prepared multi-layer heat insulating material has a good heat insulating effect, and at the same time, the heat generated by heating the cigarette can be fully utilized.

Further, the thermal radiation emitting layer can emit heat to improve the thermal insulation effect, and the radiation emissivity of the thermal radiation emitting layer is 0.61-0.92, preferably 0.90-0.92; The mirror surface reflection layer and the thermal insulation layer function better, carry out thermal insulation and improve the utilization of heat for heating cigarettes.

The raw materials for forming the thermal radiation emitting layer include metal oxides, and the metal oxides include transition metal oxides; the transition metal oxides include zinc oxide, zirconium dioxide, hafnium dioxide, titanium dioxide, iron oxide and chromium oxide at least one of them.

The raw material for forming the thermal radiation emitting layer may also be silicide, wherein the silicide includes at least one of silicon dioxide, silicon carbide and silicon nitride.

The raw material for forming the thermal radiation emitting layer can also be a high molecular polymer, wherein the high molecular polymer includes polyvinylpyrrolidone, polyvinyl alcohol, cellulose, polyimide, polyether ether ketone and polyphenylene sulfide. at least one of.

The raw material for forming the thermal radiation emitting layer may also be a carbon-based substance, and the carbon-based substance includes at least one of carbon black, carbon nanotubes and graphite.

The above-mentioned raw materials for forming the heat radiation emitting layer can be selected from one of the above-mentioned raw materials, or a combination of multiple or multiple types. For example, metal oxides are individually selected, and then the metal oxides are prepared into substances with nanostructures to form a thermal radiation emitting layer with a specific emissivity. And the raw material for forming the thermal radiation emitting layer can also be other materials, as long as it can meet the radiation emissivity and thickness requirements of the thermal radiation emitting layer.

Further, the specular reflection layer can further reflect the generated heat, etc., improve the thermal insulation efficiency, and also improve the heat utilization rate. The reflectivity of the specular reflection layer is 92%-98%, preferably 96%-98%; The layer has the above-mentioned reflectivity, which can better function with the heat radiation emission layer and the thermal insulation layer to perform thermal insulation and improve the utilization rate of the heat of heating the cigarette.

The metal materials forming the specular reflection layer include metal element or metal oxide; wherein, the metal element includes any one of gold, silver, copper, aluminum, tin and iron; the metal oxide includes titanium dioxide, Either hafnium dioxide or zinc oxide.

The specular reflection layer can be formed by a substance containing a metal plating layer on the surface, or a metal foil layer made of metal. The raw material for forming the specular reflection layer can only meet the emissivity and thickness requirements of the specular reflection layer.

Further, the thermal conductivity of the thermal insulation layer is 0.025-0.100W/(m·k), preferably 0.025-0.050W/(m·k). The material for forming the thermal insulation layer includes aerogel; the material for forming the aerogel includes silicon dioxide. In the present invention, the above-mentioned raw materials can be used to form aerogel, and then a thermal insulation layer can be formed, so that the multi-layer thermal insulation material has good thermal insulation effect and high heat utilization rate. The raw materials for forming the thermal insulation layer only need to meet the thermal conductivity and thickness requirements of the thermal insulation layer.

Further, the thickness of the thermal radiation emission layer is 35-78 microns, the thickness of the specular reflection layer is 41-86 microns, and the thickness of the thermal insulation layer is 600-1300 microns. The above thickness limit is adopted, so that the thickness of the multi-layer thermal insulation material is relatively thin, and at the same time, the requirements of thin thickness, good thermal insulation and high heat utilization rate of the multi-layer thermal insulation material are further satisfied.

Further, an embodiment of the present invention provides a method for preparing a multi-layer thermal insulation material, comprising: compounding a material for forming a thermal insulation layer and a material for forming the thermal radiation emitting layer with a specular reflection layer respectively to form a thermal radiation emitting layer. A multi-layer thermal insulation material in which the mirror surface reflection layer and the thermal insulation layer are connected in turn.

One way may be: composite the specular reflection layer with the material forming the thermal insulation layer to form a double-layer composite layer connecting the specular reflection layer and the thermal insulation layer; and then combine the double-layer composite layer with the material forming the thermal insulation layer. The materials of the thermal radiation emitting layer are compounded to form a multi-layer thermal insulation material in which the thermal radiation emitting layer, the mirror surface reflection layer and the thermal insulation layer are connected in sequence.

It should be noted that, the material forming the thermal radiation emitting layer can also be used to act on the mirror emitting layer, and then compounded with the material forming the thermal insulation layer.

Specifically, the metal material is processed under the pressure of 10-20MPa for 10-20 minutes to form a specular reflection layer. The specular emissive layer required by the invention.

One side of the specular reflection layer is coated with adhesive, and then coated with the material for forming the thermal insulation layer, and treated under a pressure of 1-2MPa for 10-20 minutes, so as to make the thermal insulation layer and the mirror surface The reflective layer can be tightly connected to improve the performance of the multi-layer thermal insulation material.

The material for forming the heat radiation emitting layer is coated on the side of the specular reflection layer relatively far away from the thermal insulation layer to form the multi-layer thermal insulation material. If the material forming the heat radiation emitting layer itself has a certain adhesiveness, it can be directly coated and pressed. If it does not have adhesiveness, it is necessary to apply adhesive glue now, and then apply it to form the heat radiation emitting layer. 's material.

Example 1

Referring to FIG. 1 , this embodiment provides a multi-layer thermal insulation material 100 , which includes a thermal radiation emitting layer 101 , a specular reflection layer 102 and a thermal insulation layer 103 connected in sequence, wherein the radiation emissivity of the thermal radiation emitting layer 101 is is 0.92, the thickness is 78 microns, the reflectivity of the specular reflection layer 102 is 98%, the thickness is 86 microns, the thermal conductivity of the thermal insulation layer 103 is 0.025 W/(m·k), and the thickness is 1284 microns.

The present embodiment provides a preparation method of a multi-layer thermal insulation material, the details are as follows:

Preparation of silica nanofibers: The preparation of silica nanofibers was performed by electrospinning, and the molar ratio of ethyl orthosilicate (TEOS), phosphoric acid (H ₂ PO ₄ ) and deionized water was 1:0.01:11. The water was uniformly mixed by magnetic stirring at room temperature, and the stirring time was 12 h to prepare solution A. Solution B was a 10 wt% polyvinyl alcohol (PVA) solution. The solution A and the solution B were mixed in a mass ratio of 1:1, and magnetically stirred for 4 h to form a pre-spinning solution for electrospinning. A certain amount of pre-spinning solution was added into a 10ml syringe, placed in an electrospinning machine, a voltage of 20kv was applied, and spinning was carried out at a propelling speed of 1.0ml/h. The obtained PVA/TEOS nanofibers were first vacuum dried at 60 °C for 4 h, and then calcined at high temperature in an air atmosphere at a calcination temperature of 850 °C and a heating rate of 5 °C/min.

The above-mentioned silica nanofibers are stirred and broken using a high-speed mixer to break the entanglement and interlayer stacking of the silica fibers by the strong shearing force of the high-speed mixer. Then AlBSi, polyacrylamide, and silica nanofibers were formed into a dispersion and added to a prepared mold, which was frozen by a dry ice/acetone bath, and finally a silica aerogel was obtained.

The purchased aluminum foil was treated at 20 MPa for 5 minutes to form a specular reflection layer with a thickness of 86 μm. Apply an appropriate amount of adhesive on one side of the aluminum foil layer to make it composite with the above silica aerogel, and heat the composite double-layer composite material at 0.2MPa for 15 minutes to enhance its bonding force and form a mirror reflection. A double-layer composite layer of layers and thermal insulation layers.

The double-layer composite layer obtained in the above steps is composited with the purchased polyimide tape. Specifically, the mirror surface reflection layer is composited with the polyimide tape on the side that is relatively far away from the thermal insulation layer to form a multi-layer. Insulation materials.

Example 2 - Example 6

The structures of the multi-layer thermal insulation materials provided in Examples 2 to 6 are the same as those of the multi-layer thermal insulation materials provided in Example 1, except that the definition of each layer is different. The preparation methods of the multi-layer thermal insulation materials provided in Examples 2 to 6 are the same as the preparation methods of the multi-layer thermal insulation materials provided in Example 1. The specific table is as follows:

Example 7

Referring to FIG. 2 , a heating cigarette appliance 200 in this embodiment includes a accommodating tube 201 for accommodating cigarettes, a heating sheet 202 for heating cigarettes, and a heater base 203 , and a accommodating cavity 204 for accommodating the cigarettes is provided in the accommodating tube 201 , the heat generating sheet 202 is arranged in the accommodating cavity 204 and is connected with the heater base 203 , and one end of the accommodating tube 201 is connected with the heater base 203 .

It also includes the above-mentioned multi-layer thermal insulation material 100 , the multi-layer thermal insulation material 100 is disposed in the above-mentioned accommodating tube 201 , and the heat radiation emitting layer 101 of the multi-layer thermal insulation material 100 is relatively close to the inner wall of the accommodating tube 201 .

Comparative Examples 1-4

The multi-layer thermal insulation material is prepared according to the method of Example 1, and the aerogel of Example 1 is replaced by glass fiber cloth to form the thermal insulation layer, and the difference is as follows:

Comparative Examples 5-6

The multi-layer thermal insulation material is prepared according to the method of Example 1, and the differences are as follows:

The examples and comparative examples were tested for thermal conductivity using the heat flow method. The test results are as follows:

Thermal conductivity (W/mK) Thermal conductivity (W/mK) Example 1 0.039 Comparative Example 3 0.9038 Example 2 0.043 Comparative Example 4 0.8561 Example 3 0.061 Comparative Example 5 0.086 Example 4 0.089 Comparative Example 6 0.032 Example 5 0.025 Example 6 0.037 Comparative Example 1 0.7254 Comparative Example 2 0.6053

It can be seen from the above table that the thermal conductivity of the multi-layer heat insulating material for non-burning cigarettes prepared by the present invention is significantly reduced, thereby ensuring better heat insulating effect.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a multi-layer thermal insulation material, which is used for thermal insulation when heating a cigarette appliance to heat a cigarette, it is characterized in that, it comprises a thermal radiation emission layer, a specular reflection layer and a thermal insulation layer that are connected in turn, and the thermal radiation The radiation emissivity of the emission layer is 0.61-0.92, the reflectivity of the specular reflection layer is 92%-98%, and the thermal conductivity of the thermal insulation layer is 0.025-0.100W/(m·k). 2. The multi-layer thermal insulation material according to claim 1, wherein the radiation emissivity of the thermal radiation emission layer is 0.90-0.92; Preferably, the raw materials for forming the thermal radiation emitting layer include at least one of metal oxides, silicides, high molecular polymers and carbon-based substances; Preferably, the metal oxide comprises a transition metal oxide; Preferably, the transition metal oxide includes at least one of zinc oxide, zirconium dioxide, hafnium dioxide, titanium dioxide, iron oxide and chromium oxide; Preferably, the suicide comprises at least one of silicon dioxide, silicon carbide and silicon nitride; Preferably, the high molecular polymer comprises at least one of polyvinylpyrrolidone, polyvinyl alcohol, cellulose, polyimide, polyether ether ketone and polyphenylene sulfide; Preferably, the carbon-based substance includes at least one of carbon black, carbon nanotubes and graphite. 3. The multilayer heat insulating material according to claim 1, wherein the reflectivity of the specular reflection layer is 96%-98%; Preferably, the metal material forming the specular reflection layer includes a metal element or a metal oxide; Preferably, the metal element includes any one of gold, silver, copper, aluminum, tin and iron; Preferably, the metal oxide includes any one of titanium dioxide, hafnium dioxide and zinc oxide. 4. The multi-layer thermal insulation material according to claim 1, wherein the thermal conductivity of the thermal insulation layer is 0.025-0.050W/(m·k); Preferably, the material forming the thermal insulation layer comprises aerogel; Preferably, the aerogel-forming feedstock comprises silica. 5. The multi-layer thermal insulation material according to any one of claims 1-4, wherein the thickness of the thermal radiation emission layer is 35-78 microns; Preferably, the thickness of the specular reflection layer is 41-86 microns; Preferably, the thickness of the thermal insulation layer is 600-1300 microns. 6. A method for preparing a multi-layer thermal insulation material according to any one of claims 1-5, characterized in that, comprising: The material for forming the thermal insulation layer and the material for forming the thermal radiation emitting layer are respectively combined with the mirror surface reflection layer to form a multi-layer thermal insulation material in which the thermal radiation emission layer, the mirror surface reflection layer and the thermal insulation layer are sequentially connected. 7. The preparation method according to claim 6, characterized in that, comprising: compounding the specular reflection layer with the material forming the thermal insulation layer to form a double-layer composite layer in which the specular reflection layer and the thermal insulation layer are connected; Then, the double-layer composite layer is composited with the material forming the thermal radiation emission layer to form a multi-layer thermal insulation material in which the thermal radiation emission layer, the specular reflection layer and the thermal insulation layer are sequentially connected; Preferably, the preparation of the specular reflection layer comprises: treating the metal material under a pressure of 10-20 MPa for 10-20 minutes to form the specular reflection layer; Preferably, the preparation step of the double-layer composite layer includes: coating one side of the specular reflection layer with an adhesive, and then coating the material for forming the thermal insulation layer, and under a pressure of 1-2 MPa Process for 10-20 minutes. 8 . The preparation method according to claim 7 , wherein the step of compounding the double-layer composite layer with the material forming the heat radiation emitting layer comprises: when the specular reflection layer is relatively far away from the thermal insulation and thermal insulation. 9 . One side of the layer is coated with the material forming the heat radiation emitting layer to form the multi-layer thermal insulation material. 9 . A heating cigarette appliance, characterized in that it comprises an accommodating tube for accommodating cigarettes and the multi-layer thermal insulation material according to any one of claims 1 to 5 , wherein the multi-layer thermal insulation material is arranged in the above-mentioned accommodating tube. 10 . inside the tube; Preferably, the heating cigarette appliance further comprises a heating sheet for heating the cigarette and a heater base, a accommodating cavity for accommodating the cigarette is arranged in the accommodating tube, the heating sheet is arranged in the accommodating cavity, and is connected with the heater base, and one end of the accommodating tube is connected with the heater base. 10. The application of the multi-layer thermal insulation material according to any one of claims 1-5 in a heating cigarette appliance; Preferably, the application is for thermal insulation when heating cigarette appliances for heating cigarettes.

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