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Short carbon fiber based electromagnetic shielding composite material and preparation method thereof

A chopped carbon fiber, electromagnetic shielding technology, applied in the field of chopped carbon fiber electromagnetic shielding composite material and its preparation, can solve the problems of easy corrosion, poor absorbing performance, high price, etc., achieve good electrical conductivity and electromagnetic shielding performance, improve Combined performance, adjustable effect of shielding performance

Inactive Publication Date: 2017-05-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of heavy weight and high cost of traditional metal electromagnetic shielding materials, provide a chopped carbon fiber electromagnetic shielding composite material with low cost, convenient processing, and excellent performance and its preparation method, which solves the problem of existing traditional metal electromagnetic shielding materials. Shielding materials are expensive, easy to oxidize, easy to corrode, difficult to process, poor absorbing performance, inconvenient to use, etc.

Method used

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  • Short carbon fiber based electromagnetic shielding composite material and preparation method thereof
  • Short carbon fiber based electromagnetic shielding composite material and preparation method thereof
  • Short carbon fiber based electromagnetic shielding composite material and preparation method thereof

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Embodiment 1

[0031] Such as figure 1 shown. A chopped carbon fiber electromagnetic shielding composite material, the chopped carbon fiber electromagnetic shielding composite material 3 has a three-layer structure, including two insulating resin layers 1 located on the outside, and chopped carbon fiber shielding sandwiched between the two insulating resin layers 1 Felt layer 2.

[0032] The material of the insulating resin layer 1 is PE or PC film.

[0033] The insulating resin layer 1 and the chopped carbon fiber shielding felt layer 2 are integrated by hot pressing, and the carbon fibers in the chopped carbon fiber shielding felt layer 2 are overlapped by hot pressing to form a three-dimensional conductive network.

Embodiment 2

[0035] A preparation method of chopped carbon fiber electromagnetic shielding composite material, comprising the steps of:

[0036] (1) Put a certain proportion of chopped ES fiber 4 and chopped carbon fiber 5 into 1.2% hydroxyethyl cellulose solution by mass fraction to disperse and mix, and stir with a mixer at a high speed, then let stand, and the chopped carbon fiber The ES fiber 4 is a polyethylene / polypropylene fiber with a skin-core structure, the skin layer is polyethylene, and the core layer is polypropylene; the mass ratio of the chopped carbon fiber 5 to the chopped ES fiber 4 is 2:3, and the fiber length is 6mm , the stirring rate of the mixer is 700rpm, the stirring time is 4min, and the standing time is 5min.

[0037] (2) Pour the dispersed solution into a paper machine with a capacity greater than 10L, and make it through the 80-mesh copper mesh on the paper machine, and then put the finished chopped carbon fiber shielding felt layer 2 into a constant temperatur...

Embodiment 3

[0042] A preparation method of chopped carbon fiber electromagnetic shielding composite material, comprising the steps of:

[0043] (1) Put a certain proportion of chopped ES fiber 4 and chopped carbon fiber 5 into the hydroxyethyl cellulose solution with a mass fraction of 1.5% to disperse and mix, and stir with a mixer at a high speed, then let stand, and the chopped carbon fiber The ES fiber 4 is a polyethylene / polypropylene fiber with a skin-core structure, the skin layer is polyethylene, and the core layer is polypropylene; the mass ratio of the chopped carbon fiber 5 to the chopped ES fiber 4 is 3:7, and the fiber length is 6mm , the stirring rate of the mixer is 600rpm, the stirring time is 5min, and the standing time is 5min.

[0044] (2) Pour the dispersed solution into a paper machine with a capacity greater than 10L, and make it through the 80-mesh copper mesh on the paper machine, and then put the finished chopped carbon fiber shielding felt layer 2 into a constant...

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Abstract

The invention discloses a preparation method of a short carbon fiber based electromagnetic shielding composite material. The preparation method comprises steps as follows: (1), short ES fibers and short carbon fibers in a certain proportion are put in a dispersion liquid sequentially according to required fibrofelt surface density and are dispersed and mixed, and a mixture is stirred by a stirrer and then left to stand; (2), a dispersed solution is poured into a paper machine and subjected to papermaking by a copper wire mesh on the paper machine, and then a short carbon fiber shielding felt layer obtained through papermaking is dried; (3), the dried short carbon fiber shielding felt layer is clamped between two insulating resin layers and subjected to hot pressing in a plate vulcanizing machine, and the short carbon fiber based electromagnetic shielding composite material is obtained. The invention further discloses the short carbon fiber based electromagnetic shielding composite material. The short carbon fiber based electromagnetic shielding composite material has the characteristics of adjustable shielding performance, ultrathin property, light weight and the like and has excellent anti-oxidation and anti-corrosion properties, the preparation method is simple and easy, the cost is low, the application is wide, and large-scale production is facilitated.

Description

technical field [0001] The invention relates to the fields of electronic communication and wearable electromagnetic shielding materials, in particular to a chopped carbon fiber electromagnetic shielding composite material and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology in modern society, the number of wireless network devices has increased dramatically. The electromagnetic energy of electromagnetic wave radiation is increasing year by year. Electromagnetic radiation pollution will affect human life and health, and it will also interfere with the normal operation of electronic equipment and reduce the reliability and stability of equipment. At present, the electromagnetic shielding layer used is usually made of metal sheet or metal filler composite material, which is covered on the parts to be protected to play the role of electromagnetic shielding. However, the density of the metal increases the...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B27/32B32B27/36B32B27/02B32B27/12B32B5/08B32B37/06B32B37/10
CPCB32B5/08B32B5/022B32B27/12B32B27/32B32B27/365B32B37/06B32B37/10B32B2262/0253B32B2262/106B32B2262/12B32B2307/202B32B2307/212B32B2307/714
Inventor 陆龙生邢迪杨滨滨汤勇
Owner SOUTH CHINA UNIV OF TECH
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