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Electromagnetic shielding composite material with multilayer gradient isolation network and preparation method thereof

A technology of electromagnetic shielding and composite materials, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., to achieve the effect of convenient operation, reducing reflection loss and increasing absorption loss

Pending Publication Date: 2022-01-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research is mainly through the structural design of conductive polymer materials, and the construction of a complete conductive network to achieve the shielding effect of low reflection and high absorption, such as the construction of homogeneous structure, foam structure, isolation structure and multi-layer structure, etc., but currently in low filler While achieving high electromagnetic shielding effectiveness under high content conditions, it is still a challenge to reduce reflection loss and improve absorption loss

Method used

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  • Electromagnetic shielding composite material with multilayer gradient isolation network and preparation method thereof
  • Electromagnetic shielding composite material with multilayer gradient isolation network and preparation method thereof
  • Electromagnetic shielding composite material with multilayer gradient isolation network and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: A preparation method of an electromagnetic shielding composite material with a multilayer gradient isolation network, comprising the following steps:

[0035] S1. Selection of raw materials: polyvinylidene fluoride (PVDF, Solvay 6010, the United States), the melt index is 8g / 10min (190°C, 2.16Kg), and the density is 1.75g / cm 3 , melting point 165°C; graphite (Qingdao Xingyuan Graphite Co., Ltd.), density 2.21g / cm 3 ; Dry ice (Chengdu Kelong Chemical Co., Ltd.).

[0036] The polyvinylidene fluoride and graphite were placed in a vacuum oven, and dried in vacuum at a temperature of 60° C. for 12 hours.

[0037] S2. Add the pure polyvinylidene fluoride treated in step S1 into a stainless steel vacuum ball mill tank, and perform ball milling with a planetary ball mill at a milling speed of 500 rpm and a milling time of 36 hours to obtain a ball milling product 1 .

[0038] S3. Add polyvinylidene fluoride, graphite and dry ice treated in step S1 to a planetary...

Embodiment 2

[0041] Embodiment 2: A kind of preparation method of electromagnetic shielding composite material with multi-layer gradient isolation network, such as figure 1shown, including the following steps:

[0042] S1. Selection of raw materials: polyvinylidene fluoride (PVDF, Solvay 6010, the United States), the melt index is 8g / 10min (190°C, 2.16Kg), and the density is 1.75g / cm 3 , melting point 165° C.; carbon nanotubes (NC7000, Belgium, average diameter 9.5 nm); dry ice (Chengdu Kelong Chemical Co., Ltd.).

[0043] The polyvinylidene fluoride and carbon nanotubes were placed in a vacuum oven, and dried in vacuum at a temperature of 60° C. for 12 hours.

[0044] S2. Add the pure polyvinylidene fluoride treated in step S1 into a stainless steel vacuum ball mill tank, and perform ball milling with a planetary ball mill at a milling speed of 500 rpm and a milling time of 36 hours to obtain a ball milling product 1.

[0045] S3. Add the polyvinylidene fluoride, carbon nanotubes and dr...

Embodiment 3

[0048] Embodiment 3: A preparation method of an electromagnetic shielding composite material with a multilayer gradient isolation network, comprising the following steps:

[0049] S1. Selection of raw materials: polystyrene (Chimei, Taiwan), melting index 8g / 10min (190°C, 2.16Kg), density 1.15g / cm 3 , melting point 173°C; graphite oxide (Qingdao Xingyuan Graphite Co., Ltd.), density 2.21g / cm 3 ; Dry ice (Chengdu Kelong Chemical Co., Ltd.).

[0050] The polystyrene and graphite oxide were placed in a vacuum oven, and dried in vacuum at a temperature of 60° C. for 12 hours.

[0051] S2. Add the pure polystyrene treated in step S1 into a stainless steel vacuum ball mill tank, and perform ball milling with a planetary ball mill at a milling speed of 500 rpm and a milling time of 36 hours to obtain a ball milling product 1.

[0052] S3, adding polystyrene, graphite oxide and dry ice treated in step S1 to a planetary ball mill for ball milling, the ratio of graphite oxide mass to ...

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Abstract

The invention discloses an electromagnetic shielding composite material with a multilayer gradient isolation network and a preparation method thereof, and belongs to the technical field of functional composites. The electromagnetic shielding composite material with the multilayer gradient isolation network is characterized in that the composite material comprises a first carbon-based shielding layer, a second carbon-based shielding layer, a third carbon-based shielding layer and an incident layer; the preparation method comprises the following steps: S1, carrying out vacuum drying on polymer particles and a conductive carbon-based filler; S2, ball-milling the pure polymer particles to obtain a first ball-milled product; S3, carrying out ball milling on the mixture of the conductive carbon-based filler, the polymer particles and dry ice; S4, respectively carrying out hot press molding on the premixes obtained in the S2 and the S3; S5, stacking the hot-press forming objects obtained in the step S4 from top to bottom and performing hot pressing to obtain a final product. The composite material prepared by the method can effectively reduce reflection loss and increase absorption loss, and the electromagnetic shielding effectiveness can be greatly improved through combination of the reduced reflection loss and the reduced absorption loss.

Description

technical field [0001] The invention relates to the technical field of functional composite materials, in particular to an electromagnetic shielding composite material with a multi-layer gradient isolation network and a preparation method thereof. Background technique [0002] With the rapid development of modern information technology, electromagnetic waves have been widely used in electronic communication, radar detection, medical diagnosis and other fields, but it has brought serious radiation pollution problems. In this context, the development of high-performance electromagnetic shielding materials is the key to achieving electromagnetic pollution protection. Among them, carbon material filled conductive polymer electromagnetic shielding materials have the advantages of low cost, low density, easy processing and controllable electromagnetic shielding performance. A new type of material that can replace traditional metal-based electromagnetic shielding materials has broa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B32B27/20B32B27/06B32B33/00C08L27/16C08K3/04C08L25/06H05K9/00
CPCB32B27/304B32B27/20B32B27/08B32B27/302B32B33/00C08K3/04C08K3/041C08K3/042H05K9/0088B32B2307/212B32B2250/24C08L27/18C08L25/06
Inventor 吴宏郭英健郭少云
Owner SICHUAN UNIV
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