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Preparation method of cheap carbon-based electromagnetic shielding plate

A technology of electromagnetic shielding and sheet materials, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of high price and difficulty in realizing industrialized production, and achieve the effects of low cost, improved electrical conductivity, and easy dispersion

Inactive Publication Date: 2020-09-08
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conductive composite panels can shield electromagnetic waves very well, but currently used carbon-based conductive materials such as graphene, carbon nanotubes, and carbon fibers are expensive and difficult to achieve industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: An inexpensive carbon-based electromagnetic shielding board, including the following raw materials according to the weight ratio: 40% resin, 1% charcoal, and 59% power generation carbon.

[0023] The charcoal is a high-temperature powdered charcoal fired in an earth kiln process.

[0024] The resin is polyvinyl chloride.

[0025] A method for preparing a cheap carbon-based electromagnetic shielding board specifically includes the following steps:

[0026] S1. Conductive treatment of power generation carbon: First, use an electromagnetic vibrating screen to screen out 200 mesh power generation carbon, place the power generation carbon in a crucible and cover the crucible lid, and then calcinate in an integrated box-type high temperature electric furnace with oxygen isolation at a heating rate of 7°C / min, calcination temperature 1350℃, calcination constant temperature time 2 h;

[0027] S2, power generation carbon compounding: compound power generation carbon powder an...

Embodiment 2

[0032] Embodiment 2: An inexpensive carbon-based electromagnetic shielding board, including the following raw materials in a weight ratio: 35% resin, 3% charcoal, and 62% power generation carbon.

[0033] The charcoal is a high-temperature powdered charcoal fired in an earth kiln process.

[0034] The resin is polypropylene.

[0035] A method for preparing a cheap carbon-based electromagnetic shielding board specifically includes the following steps:

[0036] S1. Conductive treatment of power generation carbon: First use an electromagnetic vibrating screen to screen out 300 mesh power generation carbon, place the power generation carbon in a crucible and cover the crucible lid, and then calcinate in an integrated box-type high-temperature electric furnace with oxygen isolation at a heating rate of 15°C / min, calcination temperature 1500℃, calcination constant temperature time 1 h;

[0037] S2, power generation carbon compounding: compound power generation carbon powder and resin in a m...

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Abstract

The invention discloses a preparation method of a cheap carbon-based electromagnetic shielding plate. The preparation method comprises the process steps of power generation carbon conductive treatment, power generation carbon compounding, power generation carbon resin mixture crushing, mechanical blending, mold pressing and the like. The plate is prepared from the following raw materials in percentage by weight: 20-45% of a resin, 1-5% of charcoal and 50-75% of power generation charcoal powder, wherein the power generation carbon powder is subjected to conductive treatment and has conductive performance and electromagnetic shielding performance, charcoal and a power generation carbon resin mixture are mechanically mixed, and a warm pressing process of melting, hot pressing, air leakage, hot pressing and cold pressing is adopted, so that the conductivity of the plate is improved, and uneven distribution and agglomeration of the charcoal are avoided. According to the invention, the utilization rate of power generation carbon is effectively increased, and green manufacturing of the carbon plate with the electromagnetic shielding function is achieved.

Description

Technical field [0001] The invention relates to the technical field of biomass energy and materials, in particular to a method for preparing a cheap carbon-based electromagnetic shielding board. Background technique [0002] my country is a large bamboo industry, and has abundant bamboo resources to prepare bamboo charcoal and bamboo charcoal composite materials. Bamboo charcoal has the functions of emitting far infrared, releasing negative ions, adsorbing formaldehyde, and electromagnetic shielding. Therefore, bamboo charcoal composite materials are widely used in furniture decoration. Traditional bamboo charcoal is fired in earth kilns or mechanical kilns. Bamboo charcoal fired in earth kilns has certain electrical conductivity, but the bamboo charcoal produced by earth kilns will cause greater pollution to the environment. In recent years, earth kiln bamboo charcoal enterprises have gradually decreased; mechanical kilns Compared with earth kilns, the pollution is lower, but t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K3/04C08K9/00C08K7/24C08L23/12C08J5/18H05K9/00B29C43/02B29K507/04
CPCB29C43/003B29C43/02B29K2507/04C08J5/18C08J2323/12C08J2327/06C08K3/04C08K7/24C08K9/00H05K9/0083
Inventor 江文正张文标李文珠
Owner ZHEJIANG FORESTRY UNIVERSITY
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