CN113693295A - Heating body and preparation method thereof, electric heating atomization core and electronic cigarette - Google Patents
Heating body and preparation method thereof, electric heating atomization core and electronic cigarette Download PDFInfo
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- CN113693295A CN113693295A CN202111186988.1A CN202111186988A CN113693295A CN 113693295 A CN113693295 A CN 113693295A CN 202111186988 A CN202111186988 A CN 202111186988A CN 113693295 A CN113693295 A CN 113693295A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 105
- 238000000889 atomisation Methods 0.000 title claims abstract description 26
- 239000003571 electronic cigarette Substances 0.000 title claims abstract description 14
- 238000005485 electric heating Methods 0.000 title abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 112
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 109
- 239000004917 carbon fiber Substances 0.000 claims abstract description 109
- 239000007789 gas Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 22
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910021389 graphene Inorganic materials 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 238000001994 activation Methods 0.000 claims description 10
- 238000005229 chemical vapour deposition Methods 0.000 claims description 10
- 239000002135 nanosheet Substances 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000004913 activation Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000009941 weaving Methods 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 11
- 239000011148 porous material Substances 0.000 abstract description 8
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 229920000742 Cotton Polymers 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 241000208125 Nicotiana Species 0.000 description 6
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 6
- 238000013021 overheating Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000009954 braiding Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 239000002064 nanoplatelet Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 235000019505 tobacco product Nutrition 0.000 description 2
- 230000037237 body shape Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
- A24F40/46—Shape or structure of electric heating means
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/10—Devices using liquid inhalable precursors
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/70—Manufacture
Abstract
The application relates to a heating body, a preparation method of the heating body, an electric heating atomization core and an electronic cigarette, and belongs to the technical field of electronic cigarettes. The electric heating atomization core comprises two electrodes, two conductive riveting parts and a heating body, wherein each electrode is fixedly connected with the heating body through one conductive riveting part. The heating body comprises a carbon fiber tow which is wound and woven, and a plurality of blind holes with nanoscale apertures are formed in the monofilament surface of the carbon fiber tow. In the application, the carbon fiber tows are wound and woven to form the heating body, a net-shaped pore structure capable of absorbing and guiding oil can be formed between the tows, and the heating body has better oil absorption and oil guiding capabilities; the surface of the monofilament of the carbon fiber tow is provided with a plurality of blind holes with nanometer-scale apertures, so that on one hand, a good oil locking effect can be formed, and the phenomenon of oil leakage is not easy to occur; on the other hand, synchronous heating atomization can be realized while oil absorption is carried out.
Description
Technical Field
The application relates to the technical field of electronic cigarettes, in particular to a heating body and a preparation method thereof, an electric heating atomization core and an electronic cigarette.
Background
With the generalization of the global smoking control trend, new tobacco products are becoming important development directions of the tobacco industry due to the advantage of reducing harmful ingredients, and electronic cigarettes therein have become one of the hot spots of the new tobacco products in the world.
The core component of the electronic cigarette is an atomizing core, and the atomizing core has undergone three generations of technological evolution after decades of development. The first generation technology is that a glass fiber rope is wrapped with a heating wire, and the problems of easy generation of floccules, easy powder falling and uneven heating are eliminated. The second generation technology is resistance wire cotton core, which has the advantages of large oil storage capacity, good oil guiding performance and dense smoke amount, but has obvious defects, such as no high temperature resistance of the cotton core, easy dry burning, uneven heating of tobacco oil by resistance wires, easy generation of scorched smell, loose cotton core structure, poor liquid locking capacity, easy oil leakage and large atomized molecular particles. The third generation technology is a ceramic atomizing core, and has the advantages of small atomizing particles, fine taste, good consistency and difficult occurrence of oil leakage and scorching.
At present, the ceramic atomizing core has the tendency of gradually replacing a resistance wire cotton core, but the atomizing smoke quantity of the ceramic atomizing core is small, and scorched smell can also appear when the suction quantity is large.
Disclosure of Invention
Aiming at the defects of the prior art, the embodiment of the application provides a heating body and a preparation method thereof, an electric heating atomization core and an electronic cigarette, wherein the carbon fiber is used as the heating body of the electric heating atomization core in the electronic cigarette, and the heating effect is good.
In a first aspect, an embodiment of the present application provides a heating element, where the heating element includes a carbon fiber tow woven in a winding manner, and a plurality of blind holes with nano-scale apertures are arranged on a monofilament surface of the carbon fiber tow.
The carbon fiber tows are wound and woven to form the heating body, a net-shaped pore structure capable of absorbing and guiding oil can be formed between the tows, and the heating body has better oil absorption and guiding capabilities; the surface of the monofilament of the carbon fiber tow is provided with a plurality of blind holes with nanometer-scale apertures, so that on one hand, a good oil locking effect can be formed, and the phenomenon of oil leakage is not easy to occur; on the other hand, synchronous heating atomization can be realized while oil absorption is carried out. And the material of the heating element is carbon fiber, which can generate heat and conduct heat, so that the heating element has good thermal stability, thermal shock resistance and high reliability, basically has no local overheating phenomenon, has higher temperature uniformity, and can avoid dry burning and scorched smell to a certain extent.
In some embodiments of the present application, the diameter of the blind hole is 10-100nm, the depth of the blind hole is 10-100nm, and the monofilament diameter of the carbon fiber tow is micron-sized. The oil absorption and oil guide effects of the heating body can be better, oil can be better locked, and the oil leakage phenomenon can be avoided.
In some embodiments of the present application, the specific surface area of the heat-generating body is 20 to 2000m2(ii) in terms of/g. The heating surface can be fully contacted with the tobacco tar, and the atomized particles can be obviously refined.
In some embodiments of the present application, the carbon fiber tow is one of twisted, untwisted, or untwisted; the carbon fiber tows at least comprise one of 1k, 3k, 6k, 12k, 24k, 60k, 120k, 360k and 480 k.
In some embodiments of the present application, the carbon fiber tow has a filament diameter of 3-10 μm.
In a second aspect, an embodiment of the present application provides a method for producing a heat-generating body, including: and winding and weaving the carbon fiber tows to form the carbon fiber woven rope. And forming blind holes on the surfaces of the monofilaments of the carbon fiber tows.
Wherein, the blind holes can be formed after weaving; or the blind holes can be formed first and then the weaving can be carried out. The obtained heating body can better absorb and guide oil, has good oil locking effect, is not easy to leak oil, and can realize synchronous heating atomization. And the material of the heating element is carbon fiber, which can generate heat and conduct heat, so that the heating element has good thermal stability, thermal shock resistance and high reliability, basically has no local overheating phenomenon, has higher temperature uniformity, and can avoid dry burning and scorched smell to a certain extent.
In some embodiments of the present application, the method of forming blind holes in the surface of the monofilaments of the carbon fiber tow may be a chemical vapor deposition method or a gas activation method. The chemical vapor deposition method is to prepare the blind holes by an additive method, the gas activation method is to prepare the blind holes by a material reduction method, and the blind holes can be prepared into nano-scale blind holes, so that a good oil locking effect is realized, and the oil leakage phenomenon is avoided to a certain extent.
In some embodiments of the present application, a chemical vapor deposition process includes: placing the carbon fiber tows in a heating furnace, introducing inert gas as protective gas, heating to 1000-1500 ℃, introducing hydrogen and methane, and treating for 10-120min to enable graphene nanosheets to grow on the surfaces of the carbon fiber tows, wherein the graphene nanosheets are connected in a lap joint mode to form blind holes.
Graphene nanosheets uniformly grow on the surface of the carbon fiber tows through the chemical vapor deposition method, and the graphene nanosheets are mutually overlapped, so that a blind hole structure is formed, and oil locking is facilitated.
In some embodiments of the present application, a gas activation process comprises: placing the carbon fiber tows in a heating furnace, introducing inert gas as protective gas, heating to 1000-1500 ℃, introducing water vapor and/or carbon dioxide, and treating for 10-60min to form blind holes on the surfaces of the carbon fiber tows.
By the gas activation method, part of carbon on the surface of the carbon fiber tows can react with water vapor or carbon dioxide to be converted into gas, so that blind holes are formed on the surface of the carbon fiber tows.
In a third aspect, an embodiment of the present application provides an electrically heated atomizing core, which includes two electrodes, two conductive riveting portions and the above heating element, where each electrode is fixedly connected to the heating element through one conductive riveting portion.
The heating body is used in the electric heating atomization core, a net-shaped pore structure capable of absorbing and guiding oil can be formed between the tows, and the electric heating atomization core can have better oil absorption and oil guiding capabilities; the nano-scale blind hole can form a good oil locking effect, and the phenomenon of oil leakage is not easy to occur; and synchronous heating atomization can be realized while oil absorption is realized. And the material of the heating element is carbon fiber, which can generate heat and conduct heat, so that the heating element has good thermal stability, thermal shock resistance and high reliability, basically has no local overheating phenomenon, has higher temperature uniformity, and can avoid dry burning and scorched smell to a certain extent.
In some embodiments of the present application, the heat generating body is one of a spiral type, a linear type, an S type, and a wave type.
In some embodiments of the present application, the heat generating body includes at least a liquid suction part and an atomizing part connected; the conductive riveting part is arranged at the joint of the liquid absorbing part and the atomizing part. Can better provide even current for the heating element so that the heating of the heating element is more even.
In some embodiments of the present application, the electrode is one of silver, copper, iron, aluminum, nickel, and zinc; the conductive riveting part is one of a stainless steel sheet, a copper sheet and an aluminum sheet.
In a fourth aspect, the present application provides an electronic cigarette, including the above electrically heated atomizing core.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of an electrically heated atomizing core provided in an embodiment of the present application;
FIG. 2 is a partial cross-sectional view of a carbon fiber tow in a heating body provided in an embodiment of the present application;
FIG. 3 is a scanning electron microscope photomicrograph of 5K times that of a heating element provided in example 1 of the present application;
FIG. 4 is a 20K-fold scanning electron micrograph of a heat-generating body provided in example 1 of the present application.
Icon: 110-electrodes; 120-conductive riveting; 130-a heating element; 131-carbon fiber tows; 132-carbon fiber monofilament; 133-blind holes; 134-pore space; 135-a liquid suction part; 136-atomizing part.
Detailed Description
In the prior art, the second generation technology of the atomizing core is a resistance wire cotton core, has the advantages of large oil storage capacity, good oil guiding performance and dense smoke volume, but also has obvious defects: if the cotton core is not high-temperature resistant, the cotton core is easy to dry and burn, the resistance wires heat tobacco oil unevenly, scorched flavor is easy to generate, the cotton core has a loose structure, the liquid locking capability is poor, oil leakage is easy, and atomized molecular particles are large.
The embodiment of the application provides a new electric heating atomizing core, and it uses new heat-generating body, can improve some problems of the cotton core of resistance wire. In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application are described below clearly and completely.
FIG. 1 is a schematic structural diagram of an electrically heated atomizing core provided in an embodiment of the present application; fig. 2 is a partial cross-sectional view of a carbon fiber bundle 131 wound and woven around a heat generating body 130 provided in an embodiment of the present application. Referring to fig. 1 and 2, the electrically heated atomizing core includes two electrodes 110, two conductive riveting portions 120 and a heating element 130, and each electrode 110 is fixedly connected to the heating element 130 through one conductive riveting portion 120. The heating body 130 comprises a carbon fiber bundle 131 which is wound and woven, and a plurality of blind holes 133 with nanometer-scale apertures are formed in the monofilament surface of the carbon fiber bundle 131; the filament diameter of the carbon fiber tow 131 is in the order of micrometers.
The carbon fiber tows 131 with micron-sized monofilament diameters are wound and woven to form the heating body 130, and a pore 134 structure capable of absorbing and guiding oil can be formed between the tows, so that the heating body has better oil absorption and guiding capabilities; the surface of the monofilament of the carbon fiber tow 131 is provided with a plurality of blind holes 133 with nanometer-scale apertures, so that on one hand, a good oil locking effect can be formed, and the phenomenon of oil leakage is not easy to occur; on the other hand, synchronous heating atomization can be realized while oil absorption is carried out. And the material of the heating element is carbon fiber, which can generate heat and conduct heat, so that the heating element has good thermal stability, thermal shock resistance and high reliability, basically has no local overheating phenomenon, has higher temperature uniformity, and can avoid dry burning and scorched smell to a certain extent.
Referring to fig. 2, after the carbon fiber bundle 131 is wound and woven, a pore 134 is formed between the carbon fiber bundle 131 and the carbon fiber bundle 131, a pore 134 is also formed between the carbon fiber monofilament 132 and the carbon fiber monofilament 132, and the carbon fiber monofilament 132 and the blind hole 133 on the surface of the carbon fiber monofilament 132 are matched, so that the heating element 130 has a hole structure with different pore diameters, and the through hole and the blind hole 133 can be combined, thereby effectively improving the liquid suction speed, the liquid suction amount and the liquid locking capacity of the material.
Optionally, the blind holes 133 are substantially and uniformly distributed on the surface of the carbon fiber monofilament 132, the aperture of the blind hole 133 is nano-scale, and the distance between the blind hole 133 and the blind hole 133 is also substantially nano-scale, so that the blind holes 133 are uniformly distributed on the surface of the carbon fiber monofilament 132, and the number of the blind holes 133 is large, so that a good oil locking effect can be achieved, and the oil leakage phenomenon is avoided.
In order to make the oil absorbing and guiding effects of the heating element 130 better, and to better lock oil and avoid oil leakage. The aperture of the blind hole 133 is 10-100nm, the depth of the blind hole 133 is 10-100nm, and the monofilament diameter of the carbon fiber tow 131 is 3-10 μm.
It should be noted that: the number of the blind holes 133 is multiple, the apertures of the blind holes 133 are not limited to be consistent, the apertures of the blind holes 133 can be the same or different, and the apertures of the blind holes 133 can reach the nanometer level; the depths of the blind holes 133 are not limited to be uniform, the depths of the blind holes 133 may be the same or different, and the depths of the blind holes 133 may all reach the nanometer level.
The filament diameters (the diameters of the carbon fiber filaments 132) of the carbon fiber bundles 131 may be the same or different, and the filament diameters may be up to the order of micrometers. If the diameters of the plurality of carbon fiber monofilaments 132 are all uniform, the heat generation of the heat generating body 130 can be made more uniform.
Alternatively, the specific surface area of the heat-generating body 130 is 20 to 2000m2(ii) in terms of/g. Can make the heating surface fully contact with tobacco tar and obviously refine atomized particlesAnd (4) granulating. The values of the specific surface area of the heating element 130 may be uniform or different at different portions. For example: the specific surface area of the heating element 130 may be 20 to 100m2/g、100-500m2/g、500-1000m2(g or 1000-2(ii) in terms of/g. Or, the specific surface area of a part of the heating element 130 is 100-500m2The specific surface area of the other part of the heating element 130 is 500-1000m2And/g, the application is not limited.
In this application, the heating body 130 is one of a screw type, a linear type, an S type, and a wave type, so as to absorb oil through the heating body 130 and atomize the tobacco tar.
Referring to fig. 1, the heating element 130 at least includes a liquid absorbing portion 135 and an atomizing portion 136 connected to each other, the liquid absorbing portion 135 is spiral, and the atomizing portion 136 is also spiral, so as to absorb and atomize the oil. In another embodiment, the liquid suction portion 135 may be linear, and the atomizing portion 136 may be spiral; or the liquid suction part 135 is linear, and the atomization part 136 is S-shaped; or the liquid suction part 135 is spiral type and the atomization part 136 is wave type, which is not limited in this application.
Optionally, the conductive rivet 120 is disposed at the connection between the liquid absorbing part 135 and the atomizing part 136, so as to better provide uniform current for the heating element 130, so that the heating element 130 generates heat more uniformly.
The electrode 110 may be an electrode 110 column, an electrode 110 wire, or an electrode 110 sheet, and optionally, the electrode 110 is one of silver, copper, iron, aluminum, nickel, and zinc, so as to conduct the heating element 130 with an external power source through the electrode 110.
The conductive rivet 120 is a ring-shaped structure, which can be sleeved outside the heating element 130 and then riveted with the electrode 110. Optionally, the conductive rivet 120 is one of a stainless steel sheet, a copper sheet, and an aluminum sheet.
The electric heating atomization core can be used for preparing the electronic cigarette, so that the electronic cigarette can generate heat more uniformly, the local overheating phenomenon does not exist basically, the temperature uniformity is higher, and the dry burning and the scorched flavor can be avoided to a certain extent.
Having introduced the electrically heated atomizing core, a method of making the electrically heated atomizing core is described as follows, comprising:
s110, preparing a heating element 130: the carbon fiber tows 131 are wound and woven to form the carbon fiber woven rope. Blind holes 133 are formed in the filament surfaces of the carbon fiber bundles 131. The carbon fiber bundle 131 may be first wound and woven into a carbon fiber braided rope, then the carbon fiber braided rope is formed into a main body shape (for example, a spiral shape) of the heating body 130, and then the carbon fiber braided rope is processed to form the blind hole 133 on the monofilament surface of the carbon fiber bundle 131; the carbon fiber bundle 131 may be treated to form blind holes 133 on the surface of the single filaments of the carbon fiber bundle 131, and then the carbon fiber bundle 131 having the blind holes 133 may be wound and woven into a carbon fiber braided rope, and the carbon fiber braided rope may be formed in a shape (for example, a spiral shape) of the main body of the heating element 130.
Wherein, after carbon fiber bundle 131 twines and weaves into carbon fiber and weaves the rope, certain hole 134 structure has between this carbon fiber weaves the tow of rope and the tow, makes it possess certain oil absorption and leads oily ability, and carbon fiber weaves the through-hole structure that rope formed similar "wick", is favorable to the oil absorption.
Optionally, carbon fiber tow 131 is one of twisted, untwisted, or untwisted; the carbon fiber tow 131 includes at least one of 1k, 3k, 6k, 12k, 24k, 60k, 120k, 360k, and 480 k.
The method of forming the blind holes 133 on the surface of the monofilaments of the carbon fiber tow 131 may be a chemical vapor deposition method or a gas activation method. The chemical vapor deposition method is to prepare the blind holes 133 by an additive method, and the gas activation method is to prepare the blind holes 133 by a material reduction method, so that the nano-scale blind holes 133 can be prepared, a good oil locking effect is realized, and the oil leakage phenomenon is avoided to a certain extent.
In one embodiment, a chemical vapor deposition process comprises: placing the carbon fiber tows 131 or the carbon fiber braided rope in a heating furnace, introducing inert gas (such as argon) as protective gas, heating to 1000-1500 ℃, introducing hydrogen and methane, and treating for 10-120min to enable graphene nano sheets to grow on the surfaces of the carbon fiber tows 131 and form blind holes 133 through lapping among the graphene nano sheets. Graphene nanosheets can be uniformly grown on the surface of the carbon fiber tow 131, and the graphene nanosheets are mutually overlapped, so that a blind hole 133 structure is formed, and oil locking is facilitated.
In another embodiment, a gas activation process comprises: the carbon fiber tows 131 are placed in a heating furnace, inert gas (such as argon) is introduced to serve as protective gas, the temperature is raised to 1000-1500 ℃, water vapor and/or carbon dioxide (water vapor or carbon dioxide or mixed gas of water vapor and carbon dioxide) are introduced to carry out treatment for 10-60min, and partial carbon on the surfaces of the carbon fiber tows 131 can react with the water vapor or the carbon dioxide to be converted into gas, so that blind holes 133 are formed in the surfaces of the carbon fiber tows 131 to lock oil.
In the present application, KOH or HNO may also be used3And forming blind holes 133 on the surface of the carbon fiber tows 131 by acid-base corrosion by using the etching agent.
S120, preparing an electric heating atomization core: each electrode 110 is fixedly connected to the heating element 130 by a conductive rivet 120. Optionally, the first electrode 110 is fixedly connected to one end of the heating element 130 through a conductive rivet 120; the second electrode 110 is fixedly connected to the other end of the heating element 130 by another conductive caulking portion 120. The two conductive riveting portions 120 are symmetrically distributed at the end of the heating element 130, or at any position between the end and the center.
The rapid heating atomization of the electric heating atomization core can be realized by respectively switching on the positive electrode and the negative electrode of the power supply through the first electrode 110 and the second electrode 110. The heating body 130 of the electric heating atomization core has good thermal stability, thermal shock resistance and high reliability, basically has no local overheating phenomenon, has higher temperature uniformity, and can avoid dry burning and scorched smell to a certain extent.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
A preparation method of an electrically heated atomizing core comprises the following steps:
(1) the carbon fiber braided rope was formed by winding and braiding 1k twisted carbon fiber tow having a monofilament diameter of 4 μm, and the carbon fiber braided rope was formed into a spiral shape (a shape of a heater shown in fig. 1).
(2) And placing the spiral carbon fiber braided rope in a heating furnace, introducing argon as a protective gas, heating to 1000 ℃, then introducing hydrogen and methane, and performing chemical vapor deposition for 12min to obtain the heating body.
(3) And riveting the heating body and the copper wire by adopting a stainless steel riveting sheet to obtain the electric heating atomization core.
FIG. 3 is a scanning electron microscope photograph of a heating element taken at 5K times as provided in the examples of the present application; FIG. 4 is a 20K times scanning electron micrograph of a heat-generating body provided in an example of the present application. As can be seen from fig. 3 and 4, graphene nanoplatelets substantially perpendicular to the carbon fibers are uniformly distributed on the surface of the carbon fibers, the graphene nanoplatelets are mutually overlapped to form a micro blind hole structure, and the size of the blind holes on the surface of the carbon fibers is about 100 nm.
Through the test of the nitrogen isothermal adsorption and desorption curve, the specific surface area of the heating element provided by the embodiment is 50m2/g。
Example 2
A preparation method of an electrically heated atomizing core comprises the following steps:
(1) the carbon fiber braided rope was formed by winding and braiding 480k carbon fiber tow having a monofilament diameter of 4 μm without twisting, and the carbon fiber braided rope was formed into a spiral shape (a shape of a heater shown in fig. 1).
(2) And placing the spiral carbon fiber braided rope in a heating furnace, introducing argon as protective gas, heating to 1000 ℃, then introducing steam and carbon dioxide gas, and carrying out gas activation for 12min to obtain the heating element.
(3) And riveting the heating body and the silver wire by adopting a copper riveting sheet to obtain the electric heating atomization core.
Isothermal adsorption and desorption by nitrogenCurve test shows that the specific surface area of the heating element provided by the embodiment is 600m2/g。
Comparative example 1
A preparation method of an electrically heated atomizing core comprises the following steps:
(1) the carbon fiber braided rope was formed by winding and braiding 1k twisted carbon fiber tow having a monofilament diameter of 4 μm, and the carbon fiber braided rope was formed into a spiral shape (a shape of a heating element shown in fig. 1), to obtain a heating element.
(2) And riveting the heating body and the copper wire by adopting a stainless steel riveting sheet to obtain the electric heating atomization core.
Comparative example 2
A preparation method of an electrically heated atomizing core comprises the following steps:
(1) the carbon fiber braided rope was formed by winding and braiding 480k carbon fiber tow having a monofilament diameter of 4 μm without twisting, and the carbon fiber braided rope was formed into a spiral shape (a shape of a heating element shown in fig. 1), to obtain a heating element.
(2) And riveting the heating body and the silver wire by adopting a copper riveting sheet to obtain the electric heating atomization core.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. A heating body is characterized by comprising a carbon fiber tow which is wound and woven, wherein a plurality of blind holes with nano-scale apertures are formed in the monofilament surface of the carbon fiber tow.
2. A heat-generating body as described in claim 1, wherein the aperture of said blind hole is 10 to 100nm, the hole depth of said blind hole is 10 to 100nm, and the monofilament diameter of said carbon fiber tow is in micron order.
3. A heat-generating body as described in claim 2, characterized in that the specific surface area of the heat-generating body is 20 to 2000m2/g。
4. A heat-generating body as described in any one of claims 1 to 3, characterized in that the carbon fiber tow is one of twisted, untwisted or untwisted; the carbon fiber tows at least comprise one of 1k, 3k, 6k, 12k, 24k, 60k, 120k, 360k and 480 k;
and/or the monofilament diameter of the carbon fiber tows is 3-10 mu m.
5. A heat-generating body production method as described in any one of claims 1 to 4, characterized by comprising:
winding and weaving the carbon fiber tows into a carbon fiber woven rope;
and forming the blind holes on the monofilament surface of the carbon fiber tows.
6. A heat-generating body production method as described in claim 5, characterized in that a method of forming the blind holes on the monofilament surface of the carbon fiber tow is a chemical vapor deposition method or a gas activation method.
7. A heat-generating body production method as described in claim 6, characterized in that the chemical vapor deposition method comprises: placing the carbon fiber tows in a heating furnace, introducing inert gas as protective gas, heating to 1000-1500 ℃, introducing hydrogen and methane, and treating for 10-120min to enable graphene nanosheets to grow on the surfaces of the carbon fiber tows, wherein the graphene nanosheets are overlapped to form the blind holes;
or, the gas activation process comprises: and placing the carbon fiber tows in a heating furnace, introducing inert gas as protective gas, heating to 1000-1500 ℃, introducing water vapor and/or carbon dioxide, and treating for 10-60min to form the blind holes on the surfaces of the carbon fiber tows.
8. An electrically heated atomizing core, which is characterized in that the electrically heated atomizing core comprises two electrodes, two conductive riveting parts and a heating body as claimed in any one of claims 1 to 4, wherein each electrode is fixedly connected with the heating body through one conductive riveting part.
9. The electrically heated atomizing core according to claim 8, wherein the heat-generating body is one of a spiral type, a straight type, an S type, and a wave type;
or/and the heating body at least comprises a liquid suction part and an atomization part which are connected; the conductive riveting part is arranged at the joint of the liquid absorbing part and the atomizing part;
or/and the electrode is one of silver, copper, iron, aluminum, nickel and zinc; the conductive riveting part is one of a stainless steel sheet, a copper sheet and an aluminum sheet.
10. An electronic cigarette, characterized by comprising an electrically heated atomizing core according to claim 8 or 9.
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