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A kind of lightweight high-conductivity shielding material and preparation method thereof

An electrical shielding and conductive filler technology, applied in the field of materials, can solve the problems of poor adhesion between conductive fillers and substrates, uneven distribution of conductive fillers, inconsistent conductivity of finished products, etc. The effect of wide and convenient molding and processing

Active Publication Date: 2021-12-07
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive filler dispersion composite method has good processing performance and low cost, but its main problems are: (1) The distribution of conductive fillers in the matrix is ​​often uneven, so that the conductivity of the finished product is inconsistent; (2) Adhesion between conductive filler and substrate is generally poor

Method used

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  • A kind of lightweight high-conductivity shielding material and preparation method thereof
  • A kind of lightweight high-conductivity shielding material and preparation method thereof
  • A kind of lightweight high-conductivity shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1 foam sample preparation experiment

[0059] Before the experiment, dry the polymer SBS to be used, and place it in an oven at 50-60°C for about 2 hours before use. In the experiment, ethyl acetate was used as the solvent of SBS, and a mixed solution of 20wt% SBS / ethyl acetate was prepared for use. At the same time, conductive filler particles carbon black (CB) were used as carbon-based fillers, and CB was dispersed by ultrasonic dispersion. In the ethyl acetate solution, the proportion is 5wt%. During the experiment, attention should be paid to controlling the concentration. If the concentration is too high, the solution will be too viscous and become gelatinous. Secondly, a fixed ratio of 20wt% SBS / ethyl acetate and 5wt% CB / ethyl acetate solution was used for mixing to form a mixed solution of CB and SBS in ethyl acetate, wherein the ratio of CB to SBS was 1:4, Stir the mixed solution by magnetic force for more than 24 hours, stir evenly, so that the mate...

Embodiment 2

[0060] Embodiment 2 Foam sample preparation experiment

[0061] The experiment process is similar to that of Example 1, except that the pore-forming agent is replaced by sodium chloride, and the pore diameter ratio 1 of the polymer composite foam of SBS / CB is also larger.

Embodiment 3

[0062] Embodiment 3 foam sample preparation experiment

[0063] The experiment process is similar to that of Example 1, except that the pore-forming agent is replaced with coarse sugar for the experiment, and the pore size ratio 2 of the polymer composite foam of SBS / CB is also larger.

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Abstract

The invention discloses a lightweight high-conductivity shielding material and a preparation method thereof. Specifically disclosed is an electric shielding foam composite material, which includes a matrix of foam porous structure made of a high molecular polymer as a skeleton, and conductive fillers are uniformly dispersed inside the matrix, and nano-silver particles are grown in situ on the inner and outer surfaces of the matrix The matrix of the foam porous structure is prepared by a template sacrifice method, the template sacrifice method refers to mixing a mixed organic solution of a high molecular polymer and a conductive filler with a pore-forming agent, removing the organic solvent after mixing evenly, and then putting Dissolve in water to remove the pore-forming agent, and obtain the matrix of the foam porous structure. The composite material prepared by the present invention has a high electromagnetic shielding efficiency of 60-90dB between 8.2GHz-12.5GHz, and the density of the material is 0.1-0.16g cm ‑1 It is relatively light and thin, which can meet the needs of electronic devices for electromagnetic shielding materials.

Description

technical field [0001] The invention relates to the field of materials, in particular to a lightweight high-conductivity shielding material and a preparation method and application thereof. Background technique [0002] Lightweight and efficient electromagnetic shielding materials are an important research direction in the field of electromagnetic shielding materials. At present, the commonly used lightweight electromagnetic shielding materials mainly include conductive foam, graphene foam, metal porous material and carbon nanotube composite foam. Conductive foam is prepared by depositing conductive metal particles on the surface of polymer foam skeleton, which has high electromagnetic shielding performance, but the bonding force between the surface metal particles and the surface of polymer foam skeleton is not strong, and it is easy to fall off after repeated deformation. However, graphene foam has disadvantages such as complicated preparation process, high cost, and diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L53/02C08K3/04C08K3/08C08J9/40
CPCC08J9/0066C08J9/40C08J2353/02
Inventor 胡友根沈友康古晗熊耀旭赵涛孙蓉
Owner SHENZHEN INST OF ADVANCED TECH
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