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

A technology of electromagnetic shielding and composite materials, which is applied in the fields of magnetic field/electric field shielding, electrical components, etc., to achieve the effect of simple preparation process, excellent performance and improved mechanical properties

Active Publication Date: 2021-10-01
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 thereof
  • Electromagnetic shielding epoxy composite material with isolation structure and preparation method thereof
  • Electromagnetic shielding epoxy composite material with isolation structure and preparation method thereof

Examples

Experimental program
Comparison scheme
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 thereof, belonging to the technical field of polymer composite materials. The electromagnetic shielding epoxy composite material has an electromagnetic shielding effect of 20-60dB in the X-band, a mechanical strength of 4-14MPa, and a breaking elongation of 400-800%. After crushing and re-pressing, the mechanical strength can still maintain more than 85%. The invention adopts glass-like dynamic cross-linking epoxy resin as a matrix to form a multi-walled carbon nanotube conduction path with an isolation structure, and has high electromagnetic shielding efficiency and excellent mechanical properties under low filler content. In the invention, the amount of conductive filler is less, other raw materials are commonly used and easy to obtain, the preparation process is simple, the range of hot pressing molding process conditions is wide, and the control precision is not strict. The composite material of the invention can be hot-pressed again after crushing again, the isolation network structure is still intact, and the electromagnetic shielding efficiency and mechanical properties can still maintain more than 85% of the original performance, so that reprocessing can be 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 the biggest advantages. However, most polymers do not have electromagnetic s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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