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Electromagnetic shielding epoxy composite material with isolation structure and preparation method

A technology of electromagnetic shielding and composite materials, applied in the direction of magnetic/electric field shielding, electrical components, etc., to achieve the effect of improving mechanical properties, excellent performance, and high conductivity

Active Publication Date: 2020-07-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the characteristics of dynamic covalent bond cross-linking of epoxy vitrimer to prepare isolation structure electromagnetic shielding composite materials with excellent mechanical properties has not been reported.

Method used

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  • Electromagnetic shielding epoxy composite material with isolation structure and preparation method
  • Electromagnetic shielding epoxy composite material with isolation structure and preparation method
  • Electromagnetic shielding epoxy composite material with isolation structure and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The preparation operation steps of an electromagnetic shielding epoxy composite material with an isolation structure are as follows:

[0033] (1) Stir 5.9g of polymerized fatty acid (59wt%) and 0.5g of catalyst (5wt%) at a temperature of 70°C and a relative vacuum of -80 to -100KPa; the acid value of the polymerized fatty acid is 191mg KOH / g, which contains about 82 wt% trimer acid and 18 wt% dimer acid; the catalyst is zinc acetate. When the temperature was raised to 180°C at a heating rate of 3°C / min, and kept at a temperature of 180°C and a relative vacuum of -80 to -100KPa for 2 hours, a substance A was obtained, which was a light brown viscous liquid.

[0034] (2) Lower the temperature of A to 60°C, add 3.4g of epoxy resin (34wt%), and keep stirring for 0.5h, and react for 6h at 130°C to obtain B, which is glass-like Dynamically cross-linked epoxy resin (epoxy vitrimer).

[0035](3) Crush material B, and sieve epoxy vitrimer particles with a particle size of 50-...

Embodiment 2

[0039] The preparation operation steps of an electromagnetic shielding epoxy composite material with an isolation structure are as follows:

[0040] (1) Stir 5.8g of polymerized fatty acid (58wt%) and 0.5g of catalyst (5wt%) at a temperature of 70°C and a relative vacuum of -80 to -100KPa; the acid value of the polymerized fatty acid is 191mg KOH / g, which contains about 82 wt% trimer acid and 18 wt% dimer acid; the catalyst is zinc acetate. When the temperature was raised to 180°C at a heating rate of 3°C / min, and kept at a temperature of 180°C and a relative vacuum of -80 to -100KPa for 2 hours, a substance A was obtained, which was a light brown viscous liquid.

[0041] (2) Lower the temperature of A to 60°C, add 3.3g of epoxy resin (33wt%), and keep stirring for 0.5h, and react at 130°C for 6h to obtain B, which is glass-like Dynamically cross-linked epoxy resin (epoxy vitrimer).

[0042] (3) Crush material B and sieve epoxy vitrimer particles with a particle size of 50-...

Embodiment 3

[0046] The preparation operation steps of an electromagnetic shielding epoxy composite material with an isolation structure are as follows:

[0047] (1) Stir 5.6g of polymerized fatty acid (56wt%) and 0.5g of catalyst (5wt%) at a temperature of 70°C and a relative vacuum of -80 to -100KPa; the acid value of the polymerized fatty acid is 191mg KOH / g, which contains about 82 wt% trimer acid and 18 wt% dimer acid; the catalyst is zinc acetate. When the temperature was raised to 180°C at a heating rate of 3°C / min, and kept at a temperature of 180°C and a relative vacuum of -80 to -100KPa for 2 hours, a substance A was obtained, which was a light brown viscous liquid.

[0048] (2) Lower the temperature of A to 60°C, add 3.1g of epoxy resin (31wt%), and keep stirring for 0.5h, and react for 6h at 130°C to obtain B, which is glass-like Dynamically cross-linked epoxy resin (epoxy vitrimer).

[0049] (3) Crush material B and sieve epoxy vitrimer particles with a particle size of 50-...

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Abstract

The invention relates to an electromagnetic shielding epoxy composite material with an isolation structure and a preparation method, and belongs to the technical field of polymer composite materials.The electromagnetic shielding effectiveness of the electromagnetic shielding epoxy composite material in the X waveband is 20-60 dB, the mechanical strength reaches 4-14 MPa, the elongation at break is 400-800%, and the mechanical strength can still be kept 85% or above after crushing and hot press molding are conducted again. According to the invention, glass-like dynamic cross-linked epoxy resinis used as a matrix to form a multiwalled carbon nanotube conductive path with an isolation structure, and the multiwalled carbon nanotube conductive path has high electromagnetic shielding efficiency and excellent mechanical properties under the condition of low filler content. The conductive filler is less in dosage, other raw materials are common and easy to obtain, the preparation process issimple, the hot press molding process condition range is wide, and the control precision requirement is not harsh. The composite material disclosed by the invention can be subjected to hot press molding again after being crushed again, the isolation network structure is still complete, the electromagnetic shielding efficiency and the mechanical property can still be maintained above 85% of the original properties, and reprocessing and use are realized.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a preparation method of an electromagnetic shielding epoxy composite material with an isolation structure. Background technique [0002] With the rapid development of electronic products, the problem of electromagnetic radiation pollution has attracted widespread attention. Electromagnetic pollution will not only cause huge losses to various electronic information systems such as communications and computers in our daily life, but also seriously threaten human health. healthy. Metal materials, carbon materials, and ferrite materials all have electromagnetic shielding functions, but their applications are limited due to their shortcomings such as excessive density, bulkiness, and difficulty in processing. For polymer electromagnetic shielding materials, lightness and flexibility are their biggest advantages. However, most polymers do not have electromagnetic...

Claims

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Application Information

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IPC IPC(8): C08L63/02C08K3/04C08G59/42H05K9/00
CPCC08G59/4207C08K2201/001C08K2201/003C08K2201/004C08K2201/011C08K3/041H05K9/0081C08L63/00
Inventor 方华高叶武锦杨康杰宋楷丁运生
Owner HEFEI UNIV OF TECH
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