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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 on the preparation of carbon nanofiber membranes / resin composite sheets. Carbon nanofiber membranes / resin composite sheets The relevant technology is still a blank, and it has not been applied in electromagnetic shielding.

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

Embodiment 1

[0029] Embodiment 1: the PAN powder of 6g is dissolved in the DMF of 50mL and the preparation concentration is the PAN solution of 12%, the PAN solution is packed in the injector, the setting spinning distance is 15cm, and the injection speed is 2.5mL / h, The spinning voltage was 15kV, and the PAN nanofiber film was prepared by electrospinning; the PAN nanofiber film was placed in a pre-oxidation furnace, and the pre-oxidation temperature was set to 260°C, and the time was 120min, and the PAN pre-oxidation film was obtained by pre-oxidation; 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, and carbonized to obtain a carbonized film; the carbonized film is placed in a graphitization furnace, and the set temperature is 2400°C, and the time is 120min, and graphitization is performed treatment to obtain the carbon nanofiber film for electromagnetic shielding, figure 1 It is an optical photogr...

Embodiment 2

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

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

Embodiment 3

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

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

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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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