CN115871152A - Hot-pressing pipe, organic porous foam material and preparation method and application thereof - Google Patents

Abstract

The invention relates to the technical field of electronic cigarette atomized core materials, in particular to a hot-pressing tube, an organic porous foam material, and a preparation method and application thereof. The organic porous foam material provided by the invention has a cell structure with an oval cross section. The organic porous foam material provided by the invention has a cellular structure with an oval cross section, and compared with a porous material with a circular cellular structure, the organic porous foam material has the advantages that the capillary action formed by the cellular walls is greatly increased, the oil guiding speed is obviously improved, the tobacco tar atomization efficiency and the atomization amount are further favorably improved, and the liquid leakage phenomenon can be prevented.

Description

Heat-pressed tube, organic porous foam material, preparation method and application thereof

technical field

The invention relates to the technical field of electronic smoke core materials, in particular to a heat-pressed tube, an organic porous foam material and a preparation method and application thereof.

Background technique

The electronic cigarette heating body is the core component of electronic cigarette equipment. It is composed of oil-conducting materials rich in porous structure and heating elements. The existing porous structure oil-conducting materials include organic cotton, non-woven fabrics, porous ceramics, activated carbon, Synthetic fibers etc. Cotton fiber or other fiber cotton has the problems of poor mechanical strength, unstable structure, and poor assembly consistency; organic cotton is not heat-resistant, and the conventional organic cotton core heating element will partially decompose when heated to about 200°C, producing aldehydes and ketones When the temperature continues to rise, it will start to burn and decompose when it exceeds 300°C, the oil absorption performance will drop sharply, the amount of smoke will become smaller, and it will be accompanied by a severe smoking smell. Porous ceramics are mainly made of metal oxides, silicon dioxide, silicon carbide and other inorganic materials through sintering with sintering aids and pore-forming agents. They have the advantages of high temperature resistance, acid and alkali resistance and organic medium corrosion, and have largely solved There are many defects in organic fiber oil-conducting materials, but the preparation process of porous ceramic heating elements is difficult, the production energy consumption is high, and the disadvantages such as low porosity, high density, and easy pulverization limit its application in the field of electronic cigarettes.

The organic porous foam material is obtained by foaming process by adding foaming agent, surfactant, etc. Rich three-dimensional network structure, high porosity with adjustable range, etc. However, if the organic porous foam material is directly used as the oil-conducting material of the electronic cigarette heating element, its oil-conducting rate is limited, and it is prone to liquid leakage, which will affect the electronic cigarette. The amount of smoke and smoke affects the smoking experience.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of using the existing organic porous foam material as the oil-conducting material of the heating element of the electronic cigarette. Tube, organic porous foam material and its preparation method and application.

To achieve the above object, the present invention adopts the following technical solutions:

An organic porous foam material has a cell structure with an oval cross section.

Preferably, the aspect ratio of the ellipse is (2-16):1; preferably, the aspect ratio of the ellipse is (2-7):1.

Preferably, the apparent density of the organic porous foam is 10-300kg/m ³ , and the porosity is 50-99%; preferably, the apparent density of the organic porous foam is 30-160kg/m ³ , The porosity is 80-95%.

Preferably, the organic porous foam material is cylindrical, and is selected from one or more of polyimide porous foam, polymethacrylimide porous foam, polyaryletherketone porous foam, and melamine formaldehyde resin porous foam. kind.

The organic porous foam material of the present invention has a three-dimensional structure.

The present invention also provides a method for preparing an organic porous foam material, which includes the following steps: performing radial heat pressing on a polymer porous foam raw material to obtain the organic porous foam material.

Preferably, the radial hot-pressing treatment is carried out in a hot-press tube.

Preferably, the following steps are included:

The polymer porous foam material is placed in the feed port of the heat-pressed tube, and the polymer porous foam material is moved from the feed port end of the heat-pressed tube to the discharge port end of the heat-pressed tube under the action of traction, and the polymer porous foam The raw materials are radially heat-pressed in a hot-press tube to obtain the organic porous foam material.

Preferably, the polymer porous foam raw material is a cylindrical polymer porous foam raw material, and the diameter of the cylindrical polymer porous foam raw material is larger than the diameter of the feed port of the thermocompression tube. The present invention enters the large-diameter cylindrical polymer porous foam raw material into the heating tube of the hot-pressing tube under the action of traction force, and in the heating tube, the cylindrical raw material is radially hot-pressed in the direction of the center of the circle at high temperature. , can continuously produce smaller-diameter cylindrical foam materials with fixed compression ratios.

Optionally, the heat-pressed tube may be a radial heat-pressed tube.

Preferably, the radial hot pressing temperature is 150-260°C, the diameter compression ratio is (2-6):1, preferably, the diameter compression ratio is (2-4):1;

The moving speed of the polymer porous foam raw material in the hot-press tube is 1-20mm/s, and the residence time of the polymer porous foam raw material in the hot-press tube is 0.5-10min.

In a specific embodiment, the radial hot pressing temperature can be 150°C, 180°C, 200°C, 220°C, 250°C, 260°C; the diameter compression ratio can be 2:1, 3:1, 4:1, 5 :1, 6:1. The diameter compression ratio mentioned in the present invention refers to the ratio of the diameter length of the cylindrical polymer porous foam raw material before radial heat pressing and after heat pressing.

Preferably, the polymer porous foam raw material is selected from one or more of polyimide porous foam, polymethacrylimide porous foam, polyaryletherketone porous foam, and melamine formaldehyde resin porous foam;

The organic porous foam material has a cell structure with an elliptical cross section, and the aspect ratio of the ellipse is (2-16): 1; preferably, the aspect ratio of the ellipse is (2-7 ):1.

The organic porous foam material has an apparent density of 10-300kg/m ³ and a porosity of 50-99%; preferably, the organic porous foam material has an apparent density of 30-160kg/m ³ and a porosity of 80-95%. Optionally, the apparent density of the organic porous foam material may be 10kg/m ³ , 16kg/m 3 , 20kg/m ³ , 39kg/m ³ , 40kg/ ^{m 3 ,} 50kg/m ³ , or 100kg/m ³ , 150kg/m ³ , 155kg/m ³ , 200kg/m ³ , 250kg/m ³ , 300kg/m ³ , the porosity can be 80%, 85%, 90%, 95%.

Optionally, the heat press tube has a heating tube and a guiding shrinkage mechanism arranged in communication.

Preferably, the guide shrinking mechanism is trumpet-shaped, and the thin end is connected to the feeding port of the heating tube; the heating tube is provided with a heating element, and preferably, the guide shrinking mechanism is provided with a heating element. It can be understood that the feed port of the heating tube is the same opening as the feed port of the heat press tube.

The present invention also provides a heat-pressed tube, which has a heating tube and a guiding shrinkage mechanism arranged in communication.

Preferably, the guide shrinking mechanism is trumpet-shaped, and the thin end is connected to the feeding port of the heating tube; the heating tube is provided with a heating element, and preferably, the guide shrinking mechanism is provided with a heating element. It can be understood that the feed port of the heating tube is the same opening as the feed port of the heat press tube.

The present invention also provides a liquid-guiding element, wherein the material of the liquid-guiding element is the above-mentioned organic porous foam material or the organic porous foam material prepared by the above-mentioned preparation method.

The present invention also provides a heating body, the heating body includes the above-mentioned liquid conducting element and a heating element, and the heating element is arranged on the liquid conducting element to heat the aerosol-forming substrate exported by the liquid conducting element.

The present invention also provides an atomizing device, including an atomizer, and the atomizer includes the above-mentioned heating element;

The host is electrically connected with the atomizer and controls the operation of the atomizer.

Beneficial effects of the present invention:

1) The organic porous foam material provided by the present invention, the organic porous foam material has an oval cell structure in cross-section, the inventors found that the foam material with oval cell structure is relative to the porous material with circular cell structure, The capillary action formed by the cell wall is greatly increased, and the oil conduction rate is significantly improved, which is conducive to improving the atomization efficiency and atomization volume of the e-liquid, and can prevent liquid leakage; at the same time, the porous material of the cell structure has a high temperature resistance. Lifting, reducing the risk of smoking burnt odors.

2) The organic porous foam material provided by the present invention, further, the aspect ratio of the ellipse is (2-16): 1, the porous material formed by the cell structure under this ratio has excellent oil conduction rate, resistance temperature performance and anti-leakage performance, further, the aspect ratio of the ellipse is (2-7): 1, the porous material formed by the cell structure under this ratio is more conducive to improving the oil conduction rate and temperature resistance of the material performance.

3) The organic porous foam material provided by the present invention, further, the apparent density of the organic porous foam material is 10-300kg/m ³ , and the porosity is 50-99%; preferably, the organic porous foam material The apparent density is 30-160kg/m ³ , and the porosity is 80-95%. After research, it is found that the present invention can further ensure that the material has excellent oil conduction rate and temperature resistance in combination with the above-mentioned apparent density and porosity.

4) The preparation method of the organic porous foam material provided by the present invention, the polymer porous foam raw material is radially hot-pressed to obtain the organic porous foam material. Optionally, the polymer porous foam raw material is a cylindrical polymer porous foam raw material, and by radially hot-pressing the cylindrical foam material in a direction pointing to the center of the circle, the pore density is reduced, so that the cells inside the material are formed by Spherical cells become elliptical in cross-section, and the cells after hot pressing are in the shape of rugby balls, which greatly enhances the capillary force and achieves a higher oil conduction rate. At the same time, the microstructure has a larger aspect ratio The unique cell structure is more conducive to the transmission of e-liquid in the horizontal direction, and the rapid oil conduction brings a greater amount of smoke, and the temperature resistance is greatly improved, which reduces the risk of smoking burnt smell. At the same time, the elliptical cell structure is conducive to the enhancement of liquid adsorption and the improvement of liquid locking ability.

5) The preparation method of the organic porous foam material provided by the present invention, further, the radial hot pressing temperature is 150-260°C, the diameter compression ratio is (2-6):1, and the polymer porous foam raw material is The moving speed in the radial hot-press tube is 1-20mm/s, and the residence time of the polymer porous foam raw material in the radial hot-press tube is 0.5-10min. The temperature and compression ratio make the cell structure of the material form an elliptical cell structure with an appropriate ratio, which is more conducive to enhancing the oil conduction rate and temperature resistance of the material. Preferably, the diameter compression ratio is (2-4):1, This diameter compression ratio is more conducive to improving the oil conduction rate and temperature resistance of the material.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the structural representation of radial heat-pressed tube of the present invention;

Fig. 2 is the scanning electron micrograph of cylindrical melamine formaldehyde resin porous foam raw material;

Fig. 3 is the scanning electron micrograph of the organic porous foam material that embodiment 1 prepares;

Fig. 4 is the comparison diagram of the results of the suction test of the organic porous foam material prepared in Example 1 and the organic cotton material, wherein Figure (a) is the test chart of the suction test of the organic porous foam material prepared in Example 1, and Figure (b) It is the test chart of organic cotton material suction experiment;

Fig. 5 is a schematic diagram of the preparation process of the organic porous foam material of the present invention.

Among them, 1-heating tube; 2-guide shrink mechanism; 3-feed inlet; 4-discharge port; 5-polymer porous foam raw material; 6-organic porous foam material obtained after radial hot pressing.

Detailed ways

The following examples are provided in order to further understand the present invention better, are not limited to the best implementation mode, and do not limit the content and protection scope of the present invention, anyone under the inspiration of the present invention or use the present invention Any product identical or similar to the present invention obtained by combining features of other prior art falls within the protection scope of the present invention.

If no specific experimental steps or conditions are indicated in the examples, it can be carried out according to the operation or conditions of the conventional experimental steps described in the literature in this field. The reagents or instruments used, whose manufacturers are not indicated, are all commercially available conventional reagent products.

Example 1

The present embodiment provides a kind of organic porous foam material, and its preparation method comprises the following steps:

Place the cylindrical melamine formaldehyde resin porous foam raw material on the feed port 3 of the radial heat-pressed tube, and use a tractor to move the porous foam raw material from one end of the feed port 3 of the radial heat-pressed tube to the outlet of the radial heat-pressed tube At one end of the feed port 4, the porous foam raw material is radially hot-pressed in a radial hot-press tube to obtain the organic porous foam material; the radial hot-pressing temperature is 200° C., and the diameter compression ratio is 2:1. The moving speed of the porous foam material in the radial heat-pressed tube is 2 mm/s, and the residence time of the porous foam material in the radial heat-pressed tube is 10 min.

As shown in Figure 1, the radial heat press tube has a heating tube 1 and a guiding shrinkage mechanism 2 arranged in communication, the guiding shrinking mechanism 2 is trumpet-shaped, and the thin end is connected to the feeding port of the heating tube 1; Both the heating tube 1 and the guide shrink mechanism 2 are provided with heating wires to heat the porous foam material.

Fig. 2 is the scanning electron microscope figure of cylindrical melamine formaldehyde resin porous foam material, as shown in Figure 2, the cross section of porous foam material cell structure is circular, and Fig. 3 is the scanning electron microscope of the organic porous foam material prepared by above-mentioned embodiment As shown in Figure 3, the organic porous foam material prepared in the above embodiment has a cell structure with an elliptical cross section.

Example 2

The present embodiment provides a kind of organic porous foam material, and its preparation method comprises the following steps:

Place the cylindrical melamine-formaldehyde resin porous foam raw material at the inlet of the radial heat-pressed tube, and use a tractor to move the porous foam raw material from the feed port of the radial heat-pressed tube to the outlet of the radial heat-pressed tube At one end, the porous foam raw material is radially hot-pressed in a radial hot-press tube to obtain the organic porous foam material; the radial hot-pressing temperature is 200°C, and the diameter compression ratio is 3:1, and the porous foam raw material The moving speed in the radial heat press tube is 2mm/s, and the residence time of the porous foam material in the radial heat press tube is 10min.

Example 3

The present embodiment provides a kind of organic porous foam material, and its preparation method comprises the following steps:

Place the cylindrical melamine-formaldehyde resin porous foam raw material at the inlet of the radial heat-pressed tube, and use a tractor to move the porous foam raw material from the feed port of the radial heat-pressed tube to the outlet of the radial heat-pressed tube At one end, the porous foam raw material is radially hot-pressed in a radial hot-press tube to obtain the organic porous foam material; the radial hot-press temperature is 200°C, and the diameter compression ratio is 4:1, and the porous foam raw material The moving speed in the radial heat press tube is 2mm/s, and the residence time of the porous foam material in the radial heat press tube is 10min.

Example 4

The present embodiment provides a kind of organic porous foam material, and its preparation method comprises the following steps:

Place the cylindrical melamine-formaldehyde resin porous foam raw material at the inlet of the radial heat-pressed tube, and use a tractor to move the porous foam raw material from the feed port of the radial heat-pressed tube to the outlet of the radial heat-pressed tube At one end, the porous foam raw material is radially hot-pressed in a radial hot-press tube to obtain the organic porous foam material; the radial hot-press temperature is 200° C., and the diameter compression ratio is 6:1. The porous foam raw material The moving speed in the radial heat press tube is 2mm/s, and the residence time of the porous foam material in the radial heat press tube is 10min.

Example 5

This embodiment provides a liquid-guiding element, and the material of the liquid-guiding element can be the organic porous foam material prepared in any one of the embodiments 1-4.

Example 6

This embodiment provides a heating element, the heating element includes the liquid guiding element described in Embodiment 5 and the heating element, the heating element is arranged on the liquid guiding element to heat the aerosol-forming substrate derived from the liquid guiding element .

Example 7

This embodiment provides an atomizing device, including an atomizer, the atomizer includes the heating element described in Embodiment 6; it also includes a host, which is electrically connected to the atomizer and controls the operation of the atomizer .

Comparative example 1

This comparative example provides a kind of organic porous foam material, and its preparation method comprises the steps:

The cuboid-shaped melamine formaldehyde resin porous foam raw material was placed on a flat-plate hot press for hot-press molding. The hot-press temperature was 200° C., the hot-press time was 10 minutes, and the thickness compression ratio was 4:1 to obtain the organic porous foam material.

test case 1

Test the apparent density, porosity, oil storage capacity and oil conduction rate of the cylindrical melamine formaldehyde resin porous foam raw material, the organic porous foam material prepared in the above-mentioned examples 1-4 and comparative example 1 respectively, and the test results are shown in Table 1 .

Among them, the apparent density is tested according to the GB/T6343-2009 test standard;

The porosity is tested according to the GB/T21650.2-2008 test standard;

The oil storage capacity is tested according to the following test method: the organic porous foam material prepared by the cylindrical melamine formaldehyde resin porous foam raw material, Examples 1-4 and Comparative Example 1 is cut into regular 2cm*2cm*2cm sample pieces, Weigh its mass (recorded as the initial mass of the sample block), then soak the sample block in 50㎎ tobacco standard e-liquid, remove air bubbles in a vacuum to ensure that the e-liquid fully wets the sample block, and finally remove the sample block from the e-liquid Put it on the self-made steel wire mesh support, place it for 15min, wait for the vape oil to stop dripping, weigh the mass of the sample block (recorded as the mass after soaking of the sample block); oil storage capacity = (mass after soaking of the sample block - initial mass of the sample block )/initial mass of sample block.

The oil conduction rate is tested according to the following test method: the organic porous foam material prepared by the cylindrical melamine formaldehyde resin porous foam raw material, Examples 1-4 and Comparative Example 1 is cut into regular 1cm*1cm*1cm sample pieces, Use a 10ml precision injection injector to drop 20 microliters of standard e-liquid (the standard e-liquid is 50㎎ tobacco standard e-liquid) liquid on the surface of the horizontal sample block, and observe under the electron microscope that the droplet completely submerges into the sample block. Time, calculate the ratio of the volume of the standard e-liquid liquid and the time required for the e-liquid droplet to completely submerge into the sample block to obtain the oil conduction rate.

Table 1 The physical property test results of organic porous foam materials

It can be seen from the results in Table 1 that the larger the compression ratio of the porous foam material prepared by the present invention, the higher the apparent density, but as the density increases, the proportion of the polymer matrix increases, resulting in a decrease in porosity, and the e-liquid The passing pores are compressed, the capillary action is enhanced, and the oil absorption capacity is enhanced. However, if the compression ratio is too large, it is easy to cause the collapse of the cells, which hinders the adsorption capacity of the cell structure to the e-liquid. At the same time, the increase in apparent density makes the microstructure of the material denser, the mechanical strength increases, and the consistency of product assembly is also greatly improved.

test case 2

The organic porous foam material prepared in above-mentioned embodiment 1 and organic cotton (component is natural cellulose fiber) material test its heat resistance respectively, and test method comprises the steps:

The organic porous foam material and the organic cotton are respectively prepared into a heating element using the same heating wire and the same winding method, and the pumping process is simulated by a machine for the prepared heating element, according to a fixed frequency, each pumping is 3 seconds, and the stop is 27 seconds , repeat 200 times, observe the surface condition of the heating element after inhaling 200 mouthfuls, the result is shown in Figure 4, the cotton core heating element prepared by the porous material of Example 1, compared with the organic cotton core heating element, its heat resistance is greatly improved , There is no obvious scorching phenomenon on the surface of the cotton core. The temperature resistance of the porous material provided in Example 1 is as high as 360°C, while the temperature resistance of organic cotton is only 230°C.

At the same time, the results of artificial smoking also show that this porous cotton core has a better taste experience than the organic cotton core heating element due to the absence of the influence of smoking burnt smell.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (15)

1. An organic porous foam characterized by having a cell structure with an elliptical cross-section.

2. The organic cellular foam according to claim 1 wherein the elliptical shape has an aspect ratio of (2-16) to 1; preferably, the aspect ratio of the ellipse is (2-7): 1.

3. The organic porous foam according to claim 1 or 2, characterized in that the apparent density of the organic porous foam is 10-300kg/m ³ The porosity is 50-99%; preferably, the apparent density of the organic porous foam material is 30-160kg/m ³ The porosity is 80-95%.

4. The organic cellular foam material according to any one of claims 1 to 3, wherein the organic cellular foam material is cylindrical and is selected from one or more of polyimide cellular foam, polymethacrylimide cellular foam, polyaryletherketone cellular foam, and melamine formaldehyde resin cellular foam.

5. The preparation method of the organic porous foam material is characterized by comprising the following steps: and carrying out radial hot pressing on the polymer porous foam raw material to obtain the organic porous foam material.

6. The method for preparing an organic cellular foam according to claim 5, wherein the radial hot pressing process is performed in a hot pressing pipe.

7. The method for preparing an organic cellular foam material according to claim 6, comprising the steps of:

and (3) placing the polymer porous foam raw material at the feed inlet of the hot-pressing pipe, moving the polymer porous foam raw material from one end of the feed inlet of the hot-pressing pipe to one end of the discharge outlet of the hot-pressing pipe under the action of traction force, and carrying out radial hot pressing on the polymer porous foam raw material in the hot-pressing pipe to obtain the organic porous foam material.

8. The method of claim 6 or 7, wherein the polymer cellular foam feedstock is a cylindrical polymer cellular foam feedstock, and the diameter of the cylindrical polymer cellular foam feedstock is greater than the diameter of the inlet orifice of the hot-pressed pipe.

9. The method for preparing an organic cellular foam according to any of claims 5 to 8, characterized in that the radial hot pressing temperature is 150 to 260 ℃ and the diameter compression ratio is (2-6): 1, preferably the diameter compression ratio is (2-4): 1;

the moving speed of the polymer porous foam raw material in the hot-pressing pipe is 1-20mm/s, and the retention time of the polymer porous foam raw material in the hot-pressing pipe is 0.5-10min.

10. The method for preparing organic porous foam material according to any one of claims 5 to 9, wherein the polymer porous foam raw material is selected from one or more of polyimide porous foam, polymethacrylimide porous foam, polyaryletherketone porous foam, and melamine formaldehyde resin porous foam;

the organic porous foam material has a cellular structure with an oval cross section, wherein the aspect ratio of the oval is (2-16): 1, preferably, the aspect ratio of the oval is (2-7): 1;

the apparent density of the organic porous foam material is 10-300kg/m ³ The porosity is 50-99%; preferably, the apparent density of the organic porous foam material is 30-160kg/m ³ The porosity is 80-95%.

11. The hot-pressing pipe is characterized by comprising a heating pipe and a guiding and shrinking mechanism which are communicated.

12. The hot-pressing tube as claimed in claim 11, wherein the guiding and contracting mechanism is trumpet-shaped, and a thin end of the guiding and contracting mechanism is connected with a feed port of the heating tube; the heating pipe is provided with a heating element, and preferably, the guiding and shrinking mechanism is provided with a heating element.

13. A drainage member, wherein the material of the drainage member is the organic porous foam material according to any one of claims 1 to 4 or the organic porous foam material prepared by the preparation method according to any one of claims 5 to 10.

14. A heat-generating body characterized by comprising the liquid-conductive member as recited in claim 13 and a heating element provided on the liquid-conductive member to heat an aerosol-forming substrate led out by the liquid-conductive member.

15. An atomizing device characterized by comprising an atomizer including the heat-generating body according to claim 14;

and the host is electrically connected with the atomizer and controls the atomizer to work.

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