CN113909011B - Preparation method and structure of carbon rod - Google Patents
Preparation method and structure of carbon rod Download PDFInfo
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- CN113909011B CN113909011B CN202010663071.5A CN202010663071A CN113909011B CN 113909011 B CN113909011 B CN 113909011B CN 202010663071 A CN202010663071 A CN 202010663071A CN 113909011 B CN113909011 B CN 113909011B
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- carbon
- conductive coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
- B05B5/0536—Dimensional characteristics of electrodes, e.g. diameter or radius of curvature of a needle-like corona electrode
Abstract
The invention discloses a preparation method and a structure of a carbon rod, wherein the carbon rod is applied to an electrostatic atomization device and is used as a discharge electrode for water storage and discharge, and the preparation method comprises the following steps: preparing a raw material into granulated powder through a granulation step; extruding and molding the granulated powder into a core material by using a mold, so that a plurality of microstructures are molded on the surface of the core material; the core material is sintered to form a rod core, and the rod core is a porous structure body; providing a conductive coating with water absorption, completely coating the rod core in a coating mode of coating, spraying or brushing and the like, and then curing, wherein the conductive coating adopts a carbon composite mixed resin; therefore, the invention can increase the whole surface area of the carbon rod when in use by utilizing a plurality of microstructures so as to increase the charge emission amount, and the porous structure of the rod core and the conductive coating with water absorption can absorb water so as to improve the atomization effect, the atomization efficiency and other effects.
Description
Technical Field
The invention belongs to the field of electrostatic atomization devices, and particularly relates to a preparation method and a structure of a carbon rod.
Background
Electrostatic atomization is a technique for dispersing a liquid (a substance to be atomized) using an electric field, in which the liquid approaches a discharge electrode and at least one other electrode located near the discharge electrode generates an electric field when a voltage is applied, so that the liquid in the electric field is dispersed into a spray of substantially monodisperse particles.
According to patents currently known to be published, such as: the invention relates to a mist discharging pin and an electrostatic atomization device, which are a scheme of Chinese patent ZL201310008665.2, wherein the mist discharging pin is a discharge electrode indicated by the scheme, and the mist discharging pin is designed in such a way that a plurality of concave-convex parts are arranged on the surface of a fiber forming body or a gear shape is formed, a layer of porous plastid is coated on the surface of the fiber forming body, and the porous plastid contains deliquescent components, so that liquid can be adsorbed on the fiber forming body, the atomization effect can be achieved after the fiber forming body is electrified, and the defects are that the fiber forming body is not resistant to high temperature, and the concave-convex parts and the gear on the surface are designed with difficulty in forming, so that the cost in preparation is easily increased.
For example, taiwan patent publication No. TW201213016A1 "electrostatic atomization apparatus" discloses an electrostatic atomization apparatus, which includes a discharge electrode having a tip portion and a base end portion, and a cooling portion for cooling the discharge electrode, wherein condensed water held by the discharge electrode is atomized by discharging electricity from the tip portion, and the electrostatic atomization apparatus applies high voltage to the discharge electrode to discharge electricity, thereby atomizing the condensed water held by the tip portion of the discharge electrode; however, in practice, such a design may generate an excessive amount of condensed water on the surface of the discharge electrode depending on the cooling state of the discharge electrode, and if a large amount of the excessively generated condensed water accumulates at the root of the discharge electrode, discharge at the tip of the discharge electrode becomes unstable, so that it is necessary to add a control circuit for suppressing the excessively generated condensed water, which increases the difficulty in circuit design and cost of the electrostatic atomizer.
Further, as disclosed in taiwan patent publication No. TW201515716, "a release pin assembly, a mist generating assembly, and an electrostatic atomizer using the same", a release pin assembly for use in an electrostatic atomizer capable of releasing negatively charged mist is disclosed, which is a release pin assembly comprising a core portion of a porous or fibrous molded body, and a covering portion containing a conductive material and a deliquescent component to cover the core portion; however, the release pin assembly has the disadvantages that the inner material is a porous body or a fiber molded body, which is not resistant to high temperature, and the conductive material and the deliquescent component on the surface are covered on the periphery of the core part, and the gap without the conductive material and the deliquescent component on the bottom surface is used for absorbing liquid, and the electric power generation release spray can be generated through the tip of the release pin assembly.
Disclosure of Invention
The invention aims to provide a preparation method of a carbon rod and a structure thereof in view of the defects in the prior art, wherein a raw material is prepared into granulated powder through a granulating step; extruding and molding the granulated powder into a core material by using a mold, so that a plurality of microstructures are molded on the surface of the core material; sintering the core material to form a rod core of a porous structure body, completely coating a conductive coating with water absorption on the rod core by coating, spraying or brushing and other coating modes, and then curing, wherein the conductive coating with water absorption is a carbon rod which is made of carbon composite mixed resin and is used as a discharge electrode; therefore, the plurality of microstructures can be used for increasing the whole surface area in use so as to increase the charge emission amount, and the porous structure of the rod core and the conductive coating with water absorption are used for absorbing water so as to improve the atomization effect, the atomization efficiency and other effects.
In order to achieve the purpose, the invention adopts the following technical means:
the invention provides a preparation method of a carbon rod, which is applied to an electrostatic atomization device and used as a discharge electrode for water storage and discharge, and comprises the following steps:
preparing a raw material into granulated powder through a granulation step;
extruding and molding the granulated powder into a core material by using a mold, so that a plurality of microstructures are molded on the surface of the core material;
the core material is sintered to form a rod core, and the rod core is a porous structure body; and
providing a conductive coating with water absorption, completely coating the rod core in a coating mode of coating, spraying or brushing and the like, and then curing, wherein the conductive coating adopts a carbon composite mixed resin; therefore, the microstructures on the surface of the rod core increase the whole surface area, so that the charge emission amount is increased, and the porous structure of the rod core can help to absorb moisture and improve the atomization effect and efficiency.
Preferably, the granulation step is: a dry spray granulation step or a wet granulation step.
Preferably, the raw material used in the dry spray granulation step comprises a ceramic composite powder, a binder and a lubricant.
Preferably, the raw material used in the wet granulation step includes a ceramic composite powder, water, a solvent, a binder and a lubricant.
Preferably, the ceramic composite powder in the dry spray granulation step and the wet granulation step is selected from the group consisting of: powder of one of silicon carbide, tungsten carbide, silicon oxide, aluminum oxide, silicon dioxide or a combination thereof.
Preferably, the plurality of microstructures has a pattern with an upper area smaller than a bottom area, and a shape selected from the group consisting of: one of the bullet-shaped structure, the polygonal pyramid-shaped structure and the conical structure.
Preferably, the sintering temperature used for sintering the core material is 600 to 1200 ℃, and the sintering time is 10 to 120 minutes.
Preferably, the conductive coating is coated in a single layer or multiple layers, when the conductive coating is coated in multiple layers, the carbon solid content ratio of each conductive coating is different, and the carbon solid content of the outermost conductive coating is the highest.
Preferably, the composite mixed resin used for the conductive coating is formed by adding carbon powder: one of PU, latex, PVA organic resin, acrylic resin, silicate resin, epoxy resin and silica gel is mixed with a surfactant, the surfactant is used for absorbing moisture in air, the mass percent of the carbon powder in the composite mixed resin is 5-35%, the mass percent of the resin in the composite mixed resin is 64-94%, and the mass percent of the surfactant in the composite mixed resin is 1-15%.
Preferably, the carbon powder contained in the composite mixed resin is formed by mixing more than two kinds of carbon particles with different particle sizes, and the particle size distribution range of the carbon particles is 100-10000 meshes, namely 0.15-0.0013 mm.
The invention also provides a carbon rod structure prepared by using the preparation method of the carbon rod, which comprises the following steps:
the bar core is a porous structure body, the surface of the bar core protrudes outwards and is provided with a plurality of microstructures, and each microstructure is in a shape that the area of the upper part is smaller than that of the bottom part; and
and the conductive coating completely covers the rod core, and the conductive coating selects carbon composite mixed resin.
Preferably, a plurality of said microstructures are selected from: one of a bullet-shaped structure, a polygonal pyramid-shaped structure and a conical structure.
Preferably, the conductive coating is a single layer or multiple layers, when the conductive coating is multiple layers, the ratio of the carbon solid content of each conductive coating is different, and the carbon solid content of the conductive coating at the outermost layer is the highest.
Compared with the prior art, the invention has the beneficial effects that:
the carbon rod structure prepared by the preparation method of the carbon rod has the advantages that the rod core with the porous structure can help to absorb moisture, and ceramic composite powder can resist high temperature and high voltage; meanwhile, a plurality of microstructures formed on the surface of the rod core after sintering and forming can improve the charge release amount and release efficiency; in addition, the conductive coating can reduce the cost by adopting a multi-layer coating mode, meanwhile, the water absorption can be improved by adding the surfactant into the composite mixed resin, and the conductivity can be improved by adopting more than two carbon particles with different particle sizes.
Drawings
FIG. 1 is a flowchart illustrating steps of a preferred embodiment of the present invention.
Fig. 2 is a state diagram corresponding to step S1 according to the preferred embodiment of the present invention.
Fig. 3 is a state diagram corresponding to step S2 according to the preferred embodiment of the invention.
Fig. 4 is a schematic diagram of a state corresponding to step S3 according to a preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of a state corresponding to step S4 according to a preferred embodiment of the present invention.
FIG. 6 is a schematic structural view of a carbon rod according to a preferred embodiment of the present invention.
FIG. 7 is a schematic structural diagram of a carbon rod with a microstructure according to a preferred embodiment of the invention.
FIG. 8 is a schematic structural diagram of a carbon rod with a microstructure according to a preferred embodiment of the invention.
FIG. 9 is a schematic structural diagram (III) of the carbon rod surface microstructure according to the preferred embodiment of the invention.
FIG. 10 is a schematic structural diagram (IV) of the carbon rod surface microstructure according to the preferred embodiment of the invention.
Fig. 11 is a schematic structural diagram (v) of the surface microstructure of the carbon rod according to the preferred embodiment of the invention.
Description of reference numerals:
s1 to S4
1. Raw materials
2. Granulated powder
3. Die set
4. Core material
41. Microstructure
5. Rod core
6. Conductive coating
7. Carbon rod
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Please refer to fig. 1 to 5, which are a flowchart illustrating steps and corresponding states of the steps according to a preferred embodiment of the present invention. As shown in the figures, the carbon rod of the present invention is applied to an electrostatic atomization device (not shown) as a discharge electrode for water storage and discharge, and the preparation method thereof comprises the following steps:
s1: preparing a raw material 1 into a granulated powder 2 through a granulation step; it should be noted that the granulation step used in the present invention is a dry spray granulation step or a wet granulation step, when the dry spray granulation step is used, the raw material 1 used in the present invention comprises a ceramic composite powder, a binder and a lubricant, and when the wet granulation step is used, the raw material 1 used in the present invention comprises a ceramic composite powder, water, a solvent, a binder and a lubricant, and the ceramic composite powder used in the above two granulation steps is selected from: the powder of one of silicon carbide, tungsten carbide, silicon oxide, aluminum oxide and silicon dioxide or the combination of the silicon carbide, the tungsten carbide, the silicon oxide, the aluminum oxide and the silicon dioxide can resist high temperature.
S2: extruding the granulated powder 2 into a core material 4 by using a die 3, so that a plurality of microstructures 41 are formed on the surface of the core material 4; wherein the microstructures 41 have a pattern with a smaller top area than bottom area, and the shape is selected from: one of the bullet-shaped structure, the polygonal pyramid-shaped structure and the cone-shaped structure forms a plurality of discharge points through the plurality of microstructures 41, which is greatly helpful for increasing the discharge area and the atomization effect.
S3: the core material 4 is sintered to form a rod core 5, and the rod core 5 is a porous structure body; wherein, the sintering temperature used when the core material 4 is sintered is 600-1200 ℃, and the sintering time is 10-120 minutes; it should be noted that after sintering, the water, solvent, binder and lubricant inside the rod core 5 are volatilized by high-temperature sintering, so that the rod core 5 can be formed into a porous structure which facilitates water absorption, and the microstructures 41 on the surface of the rod core can increase the charge release amount and release efficiency.
S4: providing a conductive coating 6 with water absorption, completely coating the rod core 5 by coating, spraying or brushing, and curing, wherein the conductive coating 6 is a carbon composite mixed resin; wherein, the conductive coating 6 is coated in single layer or multiple layers, when the conductive coating 6 is coated in multiple layers, the carbon solid content ratio of each conductive coating 6 is different, and the carbon solid content of the conductive coating 6 at the outermost layer is the highest. Wherein, the compound mixed resin is prepared by adding carbon powder: one of PU, latex, PVA organic resin, acrylic resin, silicate resin, epoxy resin and silica gel is mixed with a surfactant to prepare the composite, the surfactant is used for absorbing moisture in air, the mass percent of the carbon powder in the composite mixed resin is 5-35%, the mass percent of the resin in the composite mixed resin is 64-94%, and the mass percent of the surfactant in the composite mixed resin is 1-15%. The carbon powder is formed by mixing more than two kinds of carbon particles with different particle sizes, the particle size distribution range of the carbon particles is between 100 and 10000 meshes, namely 0.15mm to 0.0013mm, and the design of the plurality of conductive coatings 6 adopted by the invention can effectively reduce the manufacturing cost, moreover, the interface activator can also improve the water absorption and is beneficial to the subsequent atomization effect, in addition, the carbon powder with two different particle sizes is used by the invention, the conductivity can be increased, and the design can also ensure that the surface of the conductive coatings 6 is uneven so as to increase the charge release amount, the release efficiency and the like.
Referring to fig. 6, which is a schematic structural diagram of a carbon rod according to a preferred embodiment of the invention, as shown in the figure, the carbon rod 7 has a structure including:
the rod core 5 is formed into a porous structure body, the surface of the rod core 5 protrudes outwards and is provided with a plurality of the microstructures 41, and each microstructure 41 has a shape that the upper area is smaller than the bottom area, so that the plurality of microstructures 41 on the surface of the rod core 5 can increase the whole surface area to increase the charge emission amount, and the porous structure of the rod core 5 can help moisture absorption and improve the atomization effect and efficiency; and
the conductive coating 6 completely covers the rod core by coating, spraying or brushing and then is cured, and the conductive coating 6 is a carbon composite mixed resin, it should be noted that, the conductive coating 6 of the present invention is coated by a single layer or multiple layers, when the conductive coating 6 is coated by multiple layers, the ratio of the carbon solid content of each layer of the conductive coating 6 is different, and the carbon solid content of the outermost layer of the conductive coating 6 is the highest.
Please refer to fig. 7-11, which are schematic structural diagrams of the carbon rod surface microstructure according to the preferred embodiment of the invention. As shown in fig. 7, the microstructure 41 is a three-sided pyramidal structure, whose upper area (tip) is smaller than the bottom area (triangle); as shown in fig. 8, the microstructure 41 is a quadrangular pyramid-shaped structure whose upper area (tip) is smaller than the bottom area (quadrangle); as shown in fig. 9, the microstructure 41 is a pentagonal pyramid-shaped structure, the upper area (tip) of which is smaller than the bottom area (pentagon); as shown in fig. 10, the microstructure 41 is a conical structure, and the upper area (tip) thereof is smaller than the bottom area (circle); as shown in fig. 11, the microstructure 41 is a bullet-shaped structure, and the upper area (arc surface) thereof is smaller than the bottom area (circle).
Claims (10)
1. A preparation method of a carbon rod, wherein the carbon rod is applied to an electrostatic atomization device and is used as a discharge electrode for water storage and discharge, and the preparation method is characterized by comprising the following steps:
preparing a raw material into granulated powder through a dry spray granulation step or a wet granulation step;
extruding and molding the granulated powder into a core material by using a mold, so that a plurality of microstructures are molded on the surface of the core material;
the core material is sintered to form a rod core which is a porous structure body, wherein the sintering temperature used when the core material is sintered is 600-1200 ℃, and the sintering time is 10-120 minutes; and
providing a conductive coating with water absorbability, completely coating the rod core in a coating mode of coating, spraying or brushing and then curing, wherein the conductive coating adopts a carbon composite mixed resin, the composite mixed resin comprises carbon powder, the carbon powder is formed by mixing more than two carbon particles with different particle sizes, and the particle size distribution range of the carbon particles is between 0.15mm and 0.0013mm.
2. The method of claim 1, wherein the raw material used in the dry spray granulation step comprises a ceramic composite powder, a binder and a lubricant.
3. The method of claim 1, wherein the raw material used in the wet granulation step comprises a ceramic composite powder, water, a solvent, a binder and a lubricant.
4. A method of manufacturing a carbon rod as claimed in claim 2 or 3, wherein the ceramic composite powder is selected from the group consisting of: powder of one of silicon carbide, tungsten carbide, silicon oxide, aluminum oxide, silicon dioxide or a combination thereof.
5. The method of claim 1, wherein the plurality of microstructures have a pattern of smaller top area than bottom area and a shape selected from the group consisting of: one of a bullet-shaped structure, a polygonal pyramid-shaped structure and a conical structure.
6. The method of claim 1, wherein the conductive coating is applied in a single layer or in multiple layers, and when the conductive coating is applied in multiple layers, the ratio of the carbon solids content of each conductive coating is different, and the carbon solids content of the conductive coating at the outermost layer is highest.
7. The method of preparing a carbon rod as set forth in claim 6, wherein the composite mixed resin further comprises: the composite material is prepared by mixing one of PU, latex, PVA organic resin, acrylic resin, silicate resin, epoxy resin and silica gel, and a surfactant with the carbon powder, wherein the surfactant is used for absorbing moisture in air, the mass percentage of the carbon powder in the composite mixed resin is 5-35%, the mass percentage of the resin in the composite mixed resin is 64-94%, and the mass percentage of the surfactant in the composite mixed resin is 1-15%.
8. A carbon rod structure produced by the production method according to claim 1, comprising:
the bar core is a porous structure body, the surface of the bar core protrudes outwards and is provided with a plurality of microstructures, and each microstructure is in a shape that the area of the upper part is smaller than that of the bottom part; and
and the conductive coating completely covers the rod core and is made of carbon composite mixed resin.
9. The carbon rod structure of claim 8, wherein a plurality of the microstructures are selected from the group consisting of: one of the bullet-shaped structure, the polygonal pyramid-shaped structure and the conical structure.
10. The carbon rod structure of claim 8, wherein the conductive coating is a single layer or multiple layers, and when the conductive coating is multiple layers, the ratio of carbon solids in each layer of the conductive coating is different, and the carbon solids in the outermost layer of the conductive coating is the highest.
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| CN104646214A (en) * | 2013-11-21 | 2015-05-27 | 株式会社铁克诺弗隆帝亚 | Releasing inserting pin assembly, mist generating assembly, and static atomizing device using same |
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| EP0450701A1 (en) * | 1990-04-05 | 1991-10-09 | John L. Armitage & Co. | Conductive coating composition |
| JPH07187817A (en) * | 1991-06-03 | 1995-07-25 | Agency Of Ind Science & Technol | Material for thermal spraying and its production |
| JP2004031090A (en) * | 2002-06-25 | 2004-01-29 | Matsushita Electric Ind Co Ltd | Electron emitting element |
| US7342774B2 (en) * | 2002-11-25 | 2008-03-11 | Medtronic, Inc. | Advanced valve metal anodes with complex interior and surface features and methods for processing same |
| WO2004095480A1 (en) * | 2003-04-23 | 2004-11-04 | Tdk Corporation | Method for producing electrode for electrochemical capacitor, method for producing electrochemical capacitor, and porous particle with solvent used in such methods |
| JP4414728B2 (en) * | 2003-10-31 | 2010-02-10 | 住友電気工業株式会社 | Carbon processed body, manufacturing method thereof, and electron-emitting device |
| TWI341889B (en) * | 2006-09-06 | 2011-05-11 | Formosa Taffeta Co Ltd | Color-coated, fouling-resistant conductive clothes and manufacturing method thereof |
| GB0805640D0 (en) * | 2008-03-28 | 2008-04-30 | Hexcel Composites Ltd | Improved composite materials |
| CN101555143B (en) * | 2009-05-12 | 2012-06-06 | 宁波欧翔精细陶瓷技术有限公司 | Preparation method of normal pressure-sintered silicon carbide ceramics |
| WO2012070531A1 (en) * | 2010-11-24 | 2012-05-31 | シャープ株式会社 | Photoelectric conversion element |
| EP2735356A1 (en) * | 2012-11-22 | 2014-05-28 | Industrial Technology Research Institute | Dehumidification device and electrified desorption device thereof |
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| CN104646214A (en) * | 2013-11-21 | 2015-05-27 | 株式会社铁克诺弗隆帝亚 | Releasing inserting pin assembly, mist generating assembly, and static atomizing device using same |
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