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CN-122008638-A - Composite filtering section bar preparation method and composite filtering section bar

CN122008638ACN 122008638 ACN122008638 ACN 122008638ACN-122008638-A

Abstract

The present disclosure relates to the technical field of filter devices, and provides a preparation method of a composite filter profile and a composite filter profile, where the preparation method of the composite filter profile can prepare an ultrathin three-layer composite filter profile, and can efficiently absorb waves in a frequency band of 2.4GHz-6GHz and reflect waves in a frequency band of 6GHz or above, and compared with a traditional filter element made of plastic or metal, the composite filter profile has significantly superior filter performance, and when the composite filter profile is applied in an electronic product, the problem that an electronic element high-frequency band interferes with an antenna working frequency band can be effectively solved.

Inventors

  • WANG RONG
  • ZHANG WENZHI
  • CAO LILI
  • YIN LIMIN
  • Cang Die

Assignees

  • 联宝(合肥)电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The preparation method of the composite filter section bar is characterized by comprising the following steps of: a first film layer preparation step, namely sputtering and depositing copper-nickel alloy serving as a target on a first side of a metal foil to form a first base film layer, and perforating the first base film layer to prepare a first film layer; The preparation method comprises the steps of preparing a second film layer, namely crushing and mixing ferrite powder and graphene to prepare mixed slurry, and preparing the mixed slurry into the second film layer through a hot press molding process; a third film preparation step, namely doping the carbon nano tube and the flexible conductive substrate to prepare a third film; and a combining step, wherein the second side of the metal foil in the first film layer is fixedly attached to the first side of the second film layer, and the third film layer is fixedly attached to the second side of the second film layer, so that the composite filter section is finally manufactured.
  2. 2. The method of manufacturing a composite filter profile according to claim 1, wherein the second film layer manufacturing step comprises: A first pretreatment step of carrying out plasma etching treatment on ferrite powder to improve the specific surface area of the ferrite powder, and then eliminating lattice defects of the ferrite powder and improving magnetic permeability through an annealing process; a second pretreatment step, namely preparing graphene nano sheets from graphene through annealing treatment; and mixing, namely mixing and crushing ferrite powder and graphene nano sheets according to a ratio of 1:3, and preparing the mixed slurry.
  3. 3. The method of manufacturing a composite filter profile according to claim 1, wherein the step of forming the mixed slurry into a second film layer by a hot press forming process comprises: and filling and mixing the filling body with the mixed slurry to obtain a blank plate to be hot-pressed, hot-pressing the blank plate to be hot-pressed at high temperature, and volatilizing the filling body by heating to obtain the honeycomb-structure-shaped second film layer.
  4. 4. The method of manufacturing a composite filter profile according to claim 1, wherein the first film layer manufacturing step comprises: and a step of preprocessing a base material, namely ultrasonic cleaning the metal foil, and then heating the metal foil in reducing gas to remove the surface oxide layer of the metal foil.
  5. 5. The method of manufacturing a composite filter profile according to claim 1, wherein perforating the first base film layer into a first film layer comprises: And processing the hole body of the first base film layer along the thickness direction of the first base film layer by adopting ultraviolet laser through a laser micropore processing technology so as to prepare the first film layer.
  6. 6. The method of manufacturing a composite filter profile according to claim 1, wherein the third film layer manufacturing step comprises: Mixing the carbon nano tube and the flexible conductive substrate according to the mass ratio of 1:9, adding a dispersing agent to prepare a premix, and extruding the premix with the gradient change of concentration from inside to outside into a die through a multilayer coextrusion process to form the third film with the gradient change of impedance.
  7. 7. A composite filter profile, which can be manufactured by the method for manufacturing a composite filter profile according to any one of claims 1 to 6, characterized by comprising a first film layer (1), a second film layer (2) and a third film layer (3) which are laminated in sequence; the first film layer (1) comprises a metal foil and a copper-nickel alloy layer which is deposited on the metal foil by sputtering, and a plurality of body holes are formed in the first film layer (1) along the thickness direction of the first film layer; The second film layer (2) comprises a honeycomb structure formed by mixing ferrite and graphene; The third film layer (3) comprises a conductive polymer made by doping carbon nano tubes and a flexible conductive substrate.
  8. 8. The composite filter profile according to claim 7, characterized in that the thickness of the copper-nickel alloy layer in the first film layer (1) is not less than 0.03mm, and the density of the bulk pores in the first film layer (1) is not less than 1500 pores/cm 2.
  9. 9. The composite filter profile according to claim 7, wherein the ratio of ferrite to graphene in the honeycomb structure in the second film layer (2) is 1:3, the porosity in the honeycomb structure is not less than 60%, and the thickness of the honeycomb structure is not less than 0.25mm.
  10. 10. The composite filter profile according to claim 7, characterized in that the thickness of the conductive polymer in the third film layer (3) is not less than 0.05mm and the surface resistance of the conductive polymer is not more than 1 Ω/sq.

Description

Composite filtering section bar preparation method and composite filtering section bar Technical Field The disclosure relates to the technical field of filter devices, in particular to a preparation method of a composite filter section bar and the composite filter section bar. Background Along with the development of notebook computers with high performance and light weight, the high frequency interference of internal electronic components (such as CPU and GPU) of the notebook computer falls into the working frequency band (such as Wi-Fi 6E/7) of the antenna, resulting in increased attenuation and delay of the antenna signal. In view of this, there are notebook computers in the related art, in which a metal material (e.g., magnesium aluminum alloy) is used for suppressing electromagnetic interference influence of internal electronic components on an antenna to a certain extent, but the effect is general. Auxiliary materials (such as aluminum foil, wave absorbing materials, conductive foam and the like) are attached to the main board end of the notebook computer to shield electromagnetic interference of internal electronic elements, but the mode occupies the internal space of the notebook computer, is unfavorable for light and thin design of the notebook computer, and increases manufacturing cost and assembly complexity. Disclosure of Invention The embodiment of the disclosure provides a preparation method of a composite filter section bar and the composite filter section bar, and aims to solve the problem that electronic components in electronic products in related technologies interfere with the working frequency band of an antenna. The preparation method of the composite filter section bar provided by the embodiment of the disclosure comprises the following steps: a first film layer preparation step, namely sputtering and depositing copper-nickel alloy serving as a target on a first side of a metal foil to form a first base film layer, and perforating the first base film layer to prepare a first film layer; The preparation method comprises the steps of preparing a second film layer, namely crushing and mixing ferrite powder and graphene to prepare mixed slurry, and preparing the mixed slurry into the second film layer through a hot press molding process; a third film preparation step, namely doping the carbon nano tube and the flexible conductive substrate to prepare a third film; and a combining step, wherein the second side of the metal foil in the first film layer is fixedly attached to the first side of the second film layer, and the third film layer is fixedly attached to the second side of the second film layer, so that the composite filter section is finally manufactured. In one embodiment, the second film layer preparation step includes: A first pretreatment step of carrying out plasma etching treatment on ferrite powder to improve the specific surface area of the ferrite powder, and then eliminating lattice defects of the ferrite powder and improving magnetic permeability through an annealing process; a second pretreatment step, namely preparing graphene nano sheets from graphene through annealing treatment; and mixing, namely mixing and crushing ferrite powder and graphene nano sheets according to a ratio of 1:3, and preparing the mixed slurry. In one embodiment, the mixed slurry is formed into a second film layer by a hot press forming process, comprising: and filling and mixing the filling body with the mixed slurry to obtain a blank plate to be hot-pressed, hot-pressing the blank plate to be hot-pressed at high temperature, and volatilizing the filling body by heating to obtain the honeycomb-structure-shaped second film layer. In one embodiment, the first film layer preparation step includes: and a step of preprocessing a base material, namely ultrasonic cleaning the metal foil, and then heating the metal foil in reducing gas to remove the surface oxide layer of the metal foil. In one embodiment, perforating the first base film layer to form a first film layer includes: And processing the hole body of the first base film layer along the thickness direction of the first base film layer by adopting ultraviolet laser through a laser micropore processing technology so as to prepare the first film layer. In one embodiment, the third film layer preparation step includes: Mixing the carbon nano tube and the flexible conductive substrate according to the mass ratio of 1:9, adding a dispersing agent to prepare a premix, and extruding the premix with the gradient change of concentration from inside to outside into a die through a multilayer coextrusion process to form the third film with the gradient change of impedance. In addition, the embodiment of the disclosure also provides a composite filtering section bar, which can be manufactured by the preparation method of the composite filtering section bar, and comprises a first film layer, a second film layer and a third film layer which are sequentially