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CN-121972386-A - Medium-density cover plate coated with carbon nanofiber coating and preparation method and application thereof

CN121972386ACN 121972386 ACN121972386 ACN 121972386ACN-121972386-A

Abstract

The application provides a medium density cover plate coated with a carbon nanofiber coating, and a preparation method and application thereof, wherein the preparation method comprises the steps of performing plasma activation on the surface of the medium density cover plate; spraying a silane coupling agent on the surface of the medium-density board, soaking the carbon nanofibers in a chemical oxidant for pretreatment, preparing the carbon nanofibers into a suspension, and spraying the suspension on the surface of the medium-density board to form the medium-density cover board coated with the carbon nanofiber coating. The surface of the medium density board is activated by plasma so that active groups are introduced into the surface of the medium density board, the surface of the nano carbon fiber is chemically oxidized so that the active groups are introduced into the surface of the nano carbon fiber, and then molecular bridging is realized between the activated nano carbon fiber and the medium density board by the silane coupling agent, so that strong interface bonding is formed between the medium density board and the nano carbon fiber, and falling off deviation between the medium density board and the nano carbon fiber in the drilling process is avoided, and the drilling precision is influenced.

Inventors

  • LI FULIANG
  • ZOU XIANGDONG
  • XU JIAJUN
  • CHEN DANXIA

Assignees

  • 广东中晨电子科技有限公司

Dates

Publication Date
20260505
Application Date
20260305

Claims (10)

  1. 1. The preparation method of the medium-density cover plate coated with the carbon nanofiber coating is characterized by comprising the following steps of: Performing plasma activation on the surface of the medium density board; Spraying a silane coupling agent on the surface of the medium density board; Soaking the carbon nanofiber in a chemical oxidant for pretreatment; preparing nano carbon fiber into suspension; and spraying the suspension on the surface of the medium-density board to form the medium-density cover board coated with the carbon nanofiber coating.
  2. 2. The method for preparing a medium density cover plate coated with a carbon nanofiber coating according to claim 1, wherein the surface of the medium density plate is required to be pretreated before plasma activation, comprising: Removing floating dust and greasy dirt on the surface of the medium density board by using sand paper; The surface of the medium density board is wiped by acetone or ethanol to dry and blow out the compressed air.
  3. 3. The method for preparing a medium density cover plate coated with a carbon nanofiber coating according to claim 1, wherein the silane coupling agent is an aminosilane coupling agent.
  4. 4. The method for preparing the medium density cover plate coated with the carbon nanofiber coating according to claim 1, wherein the surface of the medium density cover plate is sprayed with a silane coupling agent, and the method comprises the following steps: Preparing a silane coupling agent into an ethanol water solution with the concentration of 2-6wt%, spraying the ethanol water solution on the surface of the medium density board, and drying the medium density board at room temperature.
  5. 5. The method for preparing a medium density cover plate coated with a carbon nanofiber coating according to claim 1, wherein the chemical oxidizer is nitric acid or hydrogen peroxide solution.
  6. 6. The method for preparing a medium density cover plate coated with a carbon nanofiber coating according to claim 1, wherein the diameter of the carbon nanofiber is 50-200nm, and the length of the carbon nanofiber is 1-15 μm; configuring the carbon nanofibers into a suspension comprising: dispersing nano carbon fiber in water polyurethane or epoxy emulsion in the proportion of 0.5-2.0 wt%, adding 0.1-0.5-wt% nonionic surfactant, and ultrasonic dispersing for 30-60 min to form stable suspension.
  7. 7. The method for preparing a medium density cover sheet coated with a carbon nanofiber coating according to claim 1, wherein the spraying of the suspension on the surface of the medium density cover sheet further comprises: After the carbon nanofiber suspension is dried, a layer of nano silicon oxide is deposited on the surface of the carbon nanofiber coating by an aerosol deposition method.
  8. 8. The method for preparing a medium density cover plate coated with a carbon nanofiber coating according to claim 1, wherein the method for preparing the medium density cover plate comprises the following steps: the wood chips are steamed and softened, sheared and rubbed by a hot mill through a grinding disc, and converted into fine fibers; Drying the fine fibers to a water content of 6-12% by an air dryer, and adding an epoxy resin adhesive to the fine fibers during the drying process; And hot-pressing the dried fine fibers to form the medium-density board.
  9. 9. A medium density cover sheet coated with a carbon nanofiber coating, characterized in that it is prepared on the basis of the preparation method according to any one of claims 1-8.
  10. 10. Use of a medium density cover plate coated with a carbon nanofiber coating as claimed in claim 9 for cover plates in circuit board drilling processes.

Description

Medium-density cover plate coated with carbon nanofiber coating and preparation method and application thereof Technical Field The invention relates to the technical field of drilling cover plates, in particular to a medium-density cover plate coated with a carbon nanofiber coating, and a preparation method and application thereof. Background In the PCB drilling process, the upper surface of the PCB needs to be covered with a cover plate, and the lower surface needs to be provided with a backing plate for protecting and supporting the PCB from the upper side and the lower side of the PCB. The cover plate is mainly used for protecting the surface of the PCB, prevents the phenomenon that the drill needle rotating at high speed scratches, scrapes and the like on the surface of the PCB when contacting with the PCB, and avoids the defects of damage to the circuit on the surface of the PCB, tearing of a copper-clad layer and the like. The cover plate material in the prior art is usually a metal cover plate or a medium density plate, and compared with the metal cover plate, the medium density plate has the advantages of low cost and easiness in processing and acquisition, but the medium density plate is formed by pressing wood fibers, has relatively small hardness, cannot effectively guide a drill bit to be vertical like a drill when the hardness of the cover plate is insufficient, and is easy to slip or deflect to cause vacancy deviation when the drill bit is in contact with the cover plate, and the cover plate with low hardness lacks supporting force at the outlet side of a drill hole, so that the circuit board is torn, burrs and burrs are increased, and the accurate control of the drilling of the circuit board cannot be realized. Disclosure of Invention The present invention is directed to solving, at least to some extent, one of the problems in the related art. Therefore, one of the purposes of the invention is to provide a preparation method of a medium density cover plate coated with a carbon nanofiber coating, which is characterized in that the surface of a medium density plate is activated by plasma so as to introduce active groups into the surface of the medium density plate, the surface of the carbon nanofiber is chemically oxidized so as to introduce active groups, and then molecular bridging is realized between the activated carbon nanofiber and the medium density plate by a silane coupling agent so as to ensure that strong interface bonding is formed between the medium density plate and the carbon nanofiber, and the falling off deviation between the medium density plate and the carbon nanofiber in the drilling process is avoided, so that the drilling precision is influenced. A preparation method of a medium-density cover plate coated with a carbon nanofiber coating comprises the following steps: Performing plasma activation on the surface of the medium density board; Spraying a silane coupling agent on the surface of the medium density board; Soaking the carbon nanofiber in a chemical oxidant for pretreatment; preparing nano carbon fiber into suspension; and spraying the suspension on the surface of the medium-density board to form the medium-density cover board coated with the carbon nanofiber coating. Further, before plasma activation is performed on the surface of the medium-density board, the surface of the medium-density board needs to be pretreated, which comprises the following steps: Removing floating dust and greasy dirt on the surface of the medium density board by using sand paper; The surface of the medium density board is wiped by acetone or ethanol to dry and blow out the compressed air. Further, the silane coupling agent is an aminosilane coupling agent. Further, spraying a silane coupling agent on the surface of the medium density board, comprising: Preparing a silane coupling agent into an ethanol water solution with the concentration of 2-6wt%, spraying the ethanol water solution on the surface of the medium density board, and drying the medium density board at room temperature. Further, the chemical oxidizing agent refers to nitric acid or hydrogen peroxide solution. Further, the diameter of the carbon nanofiber is 50-200nm, and the length of the carbon nanofiber is 1-15 mu m; configuring the carbon nanofibers into a suspension comprising: dispersing nano carbon fiber in water polyurethane or epoxy emulsion in the proportion of 0.5-2.0 wt%, adding 0.1-0.5-wt% nonionic surfactant, and ultrasonic dispersing for 30-60 min to form stable suspension. Further, after spraying the suspension on the surface of the medium density board, the method further comprises: After the carbon nanofiber suspension is dried, a layer of nano silicon oxide is deposited on the surface of the carbon nanofiber coating by an aerosol deposition method. Further, the preparation method of the medium density board comprises the following steps: the wood chips are steamed and softened, sheared and rubbed by a hot m