Carbon nanofiber membrane for electromagnetic shielding and resin composite board and preparation methods thereof

A nano-carbon fiber and nano-fiber film technology, which is applied in the field of new material technology and composite materials, can solve problems such as the difficulty of preparing nano-carbon fiber film, and achieve good electromagnetic shielding performance, simple preparation method, and light weight.

Active Publication Date: 2020-04-21
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the immature preparation technology of electrospun carbon nanofiber membranes for a long time, it is difficult to prepare carbon nanofiber membranes with high strength. Therefore, there is no public report

Method used

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  • Carbon nanofiber membrane for electromagnetic shielding and resin composite board and preparation methods thereof
  • Carbon nanofiber membrane for electromagnetic shielding and resin composite board and preparation methods thereof
  • Carbon nanofiber membrane for electromagnetic shielding and resin composite board and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1: Dissolve 6g of PAN powder in 50mL of DMF to prepare a PAN solution with a concentration of 12%, put the PAN solution into the bolus injector, set the spinning distance to 15cm, and the bolus speed to 2.5mL / h. The spinning voltage is 15kV, and the PAN nanofiber membrane is prepared by electrostatic spinning; the PAN nanofiber membrane is placed in a pre-oxidation furnace, and the pre-oxidation temperature is set to 260°C for 120 minutes, and the pre-oxidation is performed to obtain a PAN pre-oxidized film; The PAN pre-oxidized film is placed in a carbonization furnace, and the carbonization temperature is set to 1400°C and the time is 120min. The carbonization is performed to obtain a carbonized film; the carbonized film is placed in the graphitization furnace, and the temperature is set to 2400°C and the time is 120min for graphitization. Processing to obtain nano carbon fiber membrane for electromagnetic shielding, figure 1 It is an optical photo of the prepar...

Example Embodiment

[0031] Example 2: This example is basically the same as Example 1. The differences are: PAN solution concentration is 5%, voltage is 15kV, spinning distance is 18cm, pre-oxidation temperature is 250°C, pre-oxidation time is 3h, carbonization temperature It is 1000℃, the carbonization time is 3h, the graphitization temperature is 2000℃, the graphitization time is 3h, the heating temperature of the surface oxidation treatment is 350℃, the heating time is 30min, the applied pressure is 1.2MPa, the curing temperature is 100℃, and the curing The time is 30min.

[0032] The tensile strength of the resin composite board prepared in this embodiment is 62.5 MPa, and the electromagnetic shielding efficiency in the range of 30 MHz to 5 GHz is about 28 dB.

Example Embodiment

[0033] Example 3: This example is basically the same as Example 1. The differences are: PAN solution concentration is 15%, voltage is 12kV, spinning distance is 10cm, pre-oxidation temperature is 300°C, pre-oxidation time is 1h, carbonization temperature 1400℃, carbonization time is 1h, graphitization temperature is 2400℃, graphitization time is 1h, heating temperature for surface oxidation treatment is 450℃, heating time is 30min, applied pressure is 0.8MPa, curing temperature is 70℃, curing The time is 60min.

[0034] The tensile strength of the resin composite board prepared in this embodiment is 67.5 MPa, and the electromagnetic shielding efficiency in the range of 30 MHz to 5 GHz is about 28 dB.

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Abstract

The invention discloses a carbon nanofiber membrane for electromagnetic shielding and a resin composite board and preparation methods thereof. According to the invention, the carbon nanofiber membranefor electromagnetic shielding is prepared by adopting an electrostatic spinning method and a pre-oxidation, carbonization and graphitization process; and firstly, the obtained carbon nanofiber membrane for electromagnetic shielding is heated in the air to be subjected to surface oxidation treatment, then epoxy resin glue is sprayed, and after the epoxy resin glue completely wets the carbon nanofiber membrane, the resin composite board is prepared. The preparation methods disclosed by the invention are simple and beneficial to implementation; the prepared carbon nanofiber membrane for electromagnetic shielding and the prepared resin composite board are small in thickness and light in weight, and have superior corrosion resistance and excellent electromagnetic shielding performance; and compared to a micron-sized carbon fiber composite material, due to a smaller diameter of carbon nanofibers, smaller pores between the fibers and more interfaces, the resin composite board has better electromagnetic shielding performance and can enable a shielding product to be made thinner and lighter under the condition of achieving the same shielding effectiveness.

Description

technical field [0001] The invention relates to the technical fields of new material technology and composite material technology, in particular to a nano-carbon fiber film for electromagnetic shielding and a preparation method thereof, a resin composite plate and a preparation method thereof. Background technique [0002] The development of modern electronic communication equipment has brought a lot of convenience to people's social production and life, but it has also caused serious electromagnetic radiation and electromagnetic interference, which not only affects the normal operation of equipment, but also directly threatens human health. Therefore, how to avoid or reduce the harm of electromagnetic radiation and electromagnetic interference has become a hot issue of general concern in society. [0003] All countries in the world have formulated relevant standards and regulations to control electromagnetic radiation and electromagnetic interference. The most effective wa...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/43D06C7/04B05D7/24C08L63/00C08K9/00C08K7/06D01F9/22
CPCB05D7/24B05D2504/00C08K7/06C08K9/00D01F9/22D04H1/43D04H1/728D06C7/04C08L63/00
Inventor 于杰林梓家
Owner SONGSHAN LAKE MATERIALS LAB
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