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Electromagnetic wave barrier coating and preparation method thereof

A technology for shielding coatings and electromagnetic waves, applied in the field of electromagnetic wave shielding coatings, can solve problems such as instability and high conductivity of coating coatings, and achieve the effects of easy operation, good adhesion, and simple preparation methods

Inactive Publication Date: 2011-04-13
ZHONGSHAN FLASHLIGHT POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an electromagnetic wave shielding coating, which solves the problem in the prior art that the conductivity of the coating coating is relatively high and unstable due to the unstable arrangement of conductive powder, so as to obtain a good shielding effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Electromagnetic wave shielding paint, each component and percentage by weight are: conductive powder 20%, conductive resin 30%, coupling agent 1%, dispersant 3%, aligning agent 1%, solvent 45%. The above-mentioned conductive powder is micron-sized nickel powder. The aligning agent is nano-powder of tin antimony oxide. The conductive resin is epoxy acrylic conductive resin. The coupling agent is a silane coupling agent. The dispersant is selected from adducts of fatty acid ethylene oxide, polyethylene glycol polyols and polyethyleneimine derivatives. The solvent is selected from at least one of methanol, ethanol and ethylene glycol.

[0027] Process: The synthesis method adopts the blending method. First, the conductive resin is ground to the micron level, and then evenly mixed with the micron-sized conductive powder nickel powder prepared by the liquid phase reduction method, mechanically blended by grinding, and finally solvents and dispersants are added. , couplin...

Embodiment 2

[0029] Compared with embodiment 1, embodiment 2 has only changed the weight percentage of components in the formula, and the others are the same as embodiment 1. Electromagnetic wave shielding paint, the weight percentage of each component is: conductive powder 10%, conductive resin 40%, coupling agent 2%, dispersant 2%, aligning agent 1%, solvent 45%.

Embodiment 3

[0031] Compared with embodiment 1, embodiment 3 only changed the weight percentage of components in the formula, and the others are the same as embodiment 1. Electromagnetic wave shielding paint, the weight percentage of each component is: conductive powder 40%, conductive resin 18%, coupling agent 2%, dispersant 4%, aligning agent 3%, solvent 33%.

[0032] Product characteristics: The products produced in the above-mentioned embodiments have been tested, and the shielding effect reaches 40-80dB. When the coating thickness reaches more than 25μm, its conductivity is less than 0.02Ω·cm. Belongs to very effective shielding. The product has superior properties such as strong adhesion, excellent shielding effect, high hardness, good wear resistance, and low VOC emission, especially the VOC emission is only 1 / 4 of the maximum international requirement, which meets the green chemical industry of low toxicity, environmental protection, and clean production The concept creates a good...

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Abstract

The invention belongs to the field of coatings, in particular to an electromagnetic wave barrier coating which comprises the following components by weight percent: 10-50% of conducting powder, 30-45% of electroconductive resin, 0.5-2% of coupling agent, 2-4% of dispersing agent, 0.5-3% of orientational agent and 15-50% of solvent. In the invention, the problem in the prior art of unstable and relative high electric conductivity of a conducting coating layer, which is caused by unstable arrangement of conducting powder, is solved, thereby obtaining excellent shielding effect.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to an electromagnetic wave shielding coating. Background technique [0002] As a major public hazard in the world, electromagnetic environmental pollution seriously endangers human health and safety. Its main hazards are as follows: ①Electromagnetic wave interference harms electronic equipment. ②Electromagnetic wave radiation leads to information leakage. ③ Electromagnetic wave pollution threatens human health. In order to make electronic and electrical equipment have the ability to resist electromagnetic wave radiation interference and prevent information leakage, necessary technical processing is required. The use of electromagnetic wave shielding coatings is one of the effective methods to eliminate and reduce electromagnetic wave interference. [0003] Electromagnetic wave shielding coating, as a fluid material, can be easily sprayed or brushed on the surface of plastic parts of vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/10C09D7/12C09D5/24
Inventor 陈静静蒋建平李小玉
Owner ZHONGSHAN FLASHLIGHT POLYTECHNIC
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