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Insulating polymer based electromagnetic shielding material and preparation method thereof

A technology for electromagnetic shielding materials and electromagnetic shielding layers, which is applied in the field of preparing insulating polymer-based electromagnetic shielding materials with a multi-layer structure, and can solve problems such as complexity, complicated process, and programmed temperature rise

Inactive Publication Date: 2014-04-16
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this method requires temperature programming, which is relatively complicated, and only one side of the prepared material has insulating properties.
[0004] CN102378561A discloses a cover film with electromagnetic shielding effect and its manufacturing method, which includes an insulating base material layer and an epoxy resin composite material layer, and makes it have electromagnetic shielding effect by dispersing carbon nanotubes in the epoxy resin layer, but In the preparation process of this method, the epoxy resin layer needs to be cured, the process is relatively complicated, and only one side of the prepared material has insulating properties.
However, it needs to be prepared using a micro-layer co-extrusion device. The conductive filler used is a two-dimensional sheet material, and the prepared material is limited by the preparation process, and only one side has insulating properties.

Method used

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  • Insulating polymer based electromagnetic shielding material and preparation method thereof
  • Insulating polymer based electromagnetic shielding material and preparation method thereof
  • Insulating polymer based electromagnetic shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] To prepare the insulating layer c polymer solution, the specific process is as follows: Put 6g PVC and 100ml THF into a three-necked flask with a stirring device, and stir at room temperature at a stirring speed of 300 rpm until the PVC is completely dissolved. , Call this solution Lc-1; prepare the polymer / conductive filler solution used in the electromagnetic shielding layer a. The specific process is as follows: Fill a three-necked flask with a stirring device into 6g PVC and 100ml THF, and stir Under the condition of a speed of 300 revolutions per minute, stir at room temperature until the PVC is completely dissolved, then add 1.2g (20wt%) of carbonyl iron powder and stir for 300 minutes. This solution is called La-1; a reflective electromagnetic shielding layer is prepared b. The specific process of the polymer / conductive filler solution used is as follows: Fill a three-necked flask with a stirring device into 6g PVC and 100ml THF, and stir at room temperature under ...

Embodiment 2

[0041] The method is the same as in Example 1, replacing the copper powder with silver-plated glass beads. Detect the upper surface of the insulating electromagnetic shielding material (such as figure 1 C2) the surface resistivity is ρ S1 =8.3×10 15 Ω, the bottom surface (such as figure 1 C1) surface resistivity ρ S2 =7.9×10 15 Ω, test its electromagnetic shielding effectiveness under the electromagnetic wave frequency of 0.3MHz~1.5GHz to be about 35dB. Table 1 lists the surface resistivity and electromagnetic shielding effectiveness of the upper and lower surfaces of the material.

Embodiment 3

[0043] The method is the same as in Example 1, replacing the copper powder with silver-plated copper powder. Detect the upper surface of the insulating electromagnetic shielding material (such as figure 1 C2) the surface resistivity is ρ S1 =8.7×10 15 Ω, the bottom surface (such as figure 1 C1) surface resistivity ρ S2 =7.7×10 15 Ω, testing its electromagnetic shielding effectiveness at the electromagnetic wave frequency of 0.3MHz ~ 1.5GHz is about 44dB. Table 1 lists the surface resistivity and electromagnetic shielding effectiveness of the upper and lower surfaces of the material.

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Abstract

The invention relates to the technical field of electromagnetic shielding materials, and in particular relates to an insulating polymer based electromagnetic shielding material and a preparation method thereof. The shielding material provided by the invention is of a multi-layer structure with five to seven layers, wherein the middle layer is a reflecting type shielding layer; a secondary outer layer consists of one or two wave-absorbing type shielding layers; the outermost layers are insulating layers. The wave-absorbing type shielding layers are in special functional distribution by controlling the thickness of each functional layer and filling different conductive filling materials into different layers with the combination of the curtain coating layering of the wave-absorbing type shielding layers, and the overall electromagnetic shielding property of the material can be conveniently adjusted. Due to design and construction of the insulating layers on two sides of the material, the defect that the insulation property is affected as the surface of the material is conductive is avoided. The insulating polymer based electromagnetic shielding material provided by the invention can be applied to the fields such as electronic appliances, microelectronic devices and chemical products which require that the material is insulating and has the electromagnetic shielding function.

Description

Technical field [0001] The invention relates to an electromagnetic shielding functional material, in particular to an insulating polymer-based electromagnetic shielding material with a multilayer structure, and an insulating polymer-based material with a multilayer structure prepared by multiple solution casting. Methods of electromagnetic shielding materials. Background technique [0002] In actual work, precision instruments and equipment often produce electromagnetic interference and electromagnetic radiation that affect the normal operation of the equipment. Setting an electromagnetic shielding layer is a simple and effective method to prevent electromagnetic interference and radiation hazards. At present, the electromagnetic shielding layer used is usually made of metal sheets or other conductive materials, which are covered on the parts that need to be protected to play the role of electromagnetic shielding. However, the density of the metal sheet increases the weight of t...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/20B32B27/18B32B37/02
Inventor 温变英张扬
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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