Preparation method of copper and ceramic powder composite electromagnetic shielding material

A ceramic powder, composite electromagnetic technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of high price, easy oxidation and poor oxidation resistance of silver-based coatings, improve interface links, improve electromagnetic shielding effect, promote The effect of interface polarization

Active Publication Date: 2020-01-31
YANGZHOUSRKLE INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silver paint is expensive and only suitable for certain occasions
Copper-based coatings have low cost and good electrical conductivity, but their oxidation resistance is poor and they are easily oxidized when exposed to air.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of a composite electromagnetic shielding material of copper and ceramic powder, comprising the following steps:

[0016] S1. Add L-cysteine ​​to a nitrogen-saturated 1mol / LTris buffer solution to form a 0.15mol / L L-cysteine ​​solution;

[0017] S2. Copper powder and sulfur powder are added in the mixed solution of choline chloride and ethylene glycol at a molar ratio of 0.5: 1, and L-cysteine ​​solution is added dropwise, wherein, the amount of L-cysteine ​​and copper powder The molar ratio is 2:1, heated and stirred in a 40°C water bath for 12 hours, cooled to room temperature, and then washed and dried to obtain L-cysteine-coated CuS particles;

[0018] S3. Dissolve tartaric acid in deionized water, then adjust the solution to weak alkalinity and add ceramic powder barium titanate, wherein the molar ratio of ceramic powder barium titanate and chelating agent tartaric acid is 1:1, heat and stir in a 50°C water bath After reacting for 2 hours, afte...

Embodiment 2

[0022] A preparation method of a composite electromagnetic shielding material of copper and ceramic powder, comprising the following steps:

[0023] S1. Add L-cysteine ​​to a nitrogen-saturated 1mol / LTris buffer solution to form a 0.25mol / L L-cysteine ​​solution;

[0024] S2. Copper powder and sulfur powder are added in the mixed solution of choline chloride and ethylene glycol as 2: 1 by molar ratio, and L-cysteine ​​solution is added dropwise, wherein, the content of L-cysteine ​​and copper powder The molar ratio is 2:1, heated and stirred in a 40°C water bath for 24 hours, cooled to room temperature, and then washed and dried to obtain L-cysteine-coated CuS particles;

[0025] S3. Dissolve tartaric acid in deionized water, then adjust the solution to weak alkalinity and add ceramic powder barium titanate, wherein the molar ratio of ceramic powder barium titanate and chelating agent tartaric acid is 1:2, heat and stir in a 50°C water bath After reacting for 2 hours, after t...

Embodiment 3

[0029] A preparation method of a composite electromagnetic shielding material of copper and ceramic powder, comprising the following steps:

[0030] S1. Add L-cysteine ​​to a nitrogen-saturated 1mol / LTris buffer solution to form a 0.15mol / L L-cysteine ​​solution;

[0031] S2. Copper powder and sulfur powder are added in the mixed solution of choline chloride and ethylene glycol as 1:1 by molar ratio, and L-cysteine ​​solution is added dropwise, wherein, the content of L-cysteine ​​and copper powder The molar ratio is 2:1, heated and stirred in a 40°C water bath for 16 hours, cooled to room temperature, then washed and dried to obtain L-cysteine-coated CuS particles;

[0032] S3. Dissolve tartaric acid in deionized water, then adjust the solution to weak alkalinity and add ceramic powder barium titanate, wherein the molar ratio of ceramic powder barium titanate and chelating agent tartaric acid is 1:1, heat and stir in a 50°C water bath After reacting for 2 hours, after the re...

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PUM

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Abstract

The invention provides a preparation method of a copper and ceramic powder composite electromagnetic shielding material. The method comprises the steps that S1 an L-cysteine solution is prepared; S2 L-cysteine-coated CuS particles are prepared; S3 tartaric acid modified barium titanate is prepared; S4 components comprises, by weight, 60 to 75 parts of acrylic resin, 3 to 8 parts of 2,2,4-trimethy-l,3 pentanediol monoisobutyrate, 0.2 to 0.5 part of nonylphenol epoxy vinyl ether, 10 to 20 parts of ethyl acetate, 10 to 20 parts of xylene, 40 to 50 parts of L-cysteine-coated CuS particles and 35 to 45 parts of tartrate-modified barium titanate are weighed; and S5 the components are mixed, ball-milled in a ball-milling tank to prepare a electromagnetic shielding coating. The electromagnetic shielding material prepared by the method has the advantages of high shielding efficiency and good electrical conductivity.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding materials, in particular to a method for preparing a composite electromagnetic shielding material of copper and ceramic powder. Background technique [0002] The electromagnetic radiation pollution produced by the electronics industry has seriously affected human health and the use of precision instruments. At present, the main method to eliminate electromagnetic hazards is to use electromagnetic shielding materials to shield them. When electromagnetic waves radiate to the electromagnetic shielding body, the shielding body can effectively reflect and absorb electromagnetic waves to attenuate electromagnetic energy, thereby achieving the effect of electromagnetic shielding. Silver-based paints are expensive and only suitable for certain occasions. Copper-based coatings have low cost and good electrical conductivity, but their oxidation resistance is poor and they are easily oxidized when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 沈丽尧
Owner YANGZHOUSRKLE INDAL
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