Lightweight and high-performance electromagnetic shielding coating and its preparation technology and construction technology

An electromagnetic shielding coating and construction technology technology, applied in conductive coatings, fire-retardant coatings, coatings, etc., can solve the problems of unavailability, insufficient shielding efficiency, and poor low temperature cold brittleness resistance, and achieves increased electromagnetic wave reflection attenuation, Taking into account the mechanical properties of the coating and enhancing the effect of shielding effectiveness

Active Publication Date: 2022-01-21
江苏朝晖涂装工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, electromagnetic shielding coatings generally use metal or carbon-based conductive materials to shield electromagnetic waves. Metal materials such as silver and copper have better shielding performance in high-frequency bands, but ordinary metal materials have a larger proportion. Can not get a lower coating surface density; the conductivity of carbon-based materials is slightly poor, the shielding performance is limited, and the shielding effectiveness is not high enough
[0003] Common electromagnetic shielding coating binders use epoxy resin, polyurethane resin, etc., which are not very good at low temperature and cold brittleness

Method used

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  • Lightweight and high-performance electromagnetic shielding coating and its preparation technology and construction technology
  • Lightweight and high-performance electromagnetic shielding coating and its preparation technology and construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation process of a lightweight high-performance electromagnetic shielding coating, comprising the steps of:

[0041] Put 15% of the hollow silver fiber, 5% of absolute ethanol, and 5% of butanol in a magnetic stirring tank and stir evenly, control the speed not to exceed 50 rpm, slowly add 0.3% of the dispersant dropwise, and mix well;

[0042] Pour the remaining 5% absolute ethanol and 10% butanol into the above-mentioned hollow silver fiber slurry, ultrasonically vibrate, and slowly add the resin mixture while oscillating for 15 minutes;

[0043] Finally, 0.1% of the anti-sedimentation wax slurry is added, stirred and mixed to obtain a light-weight high-performance electromagnetic shielding coating.

[0044] Its performance parameters are as follows:

[0045] Conductivity 10 4 Siemens, 1G electromagnetic shielding 65db.

[0046] Bending 1mm round rod, resistant to low temperature -40℃.

Embodiment 2

[0048] A preparation process of a lightweight high-performance electromagnetic shielding coating, comprising the steps of:

[0049] Put 20% of the hollow silver fiber, 7% of absolute ethanol, and 10% of butanol in a magnetic stirring tank and stir evenly, control the speed not to exceed 50 rpm, slowly add 0.4% of the dispersant dropwise, and mix well;

[0050] Pour the remaining 5% absolute ethanol and 5% butanol into the above-mentioned hollow silver fiber slurry, ultrasonically vibrate, and slowly add the resin mixture while oscillating for 15 minutes;

[0051] Finally, 0.2% of the anti-sedimentation wax slurry is added, stirred and mixed to obtain a light-weight high-performance electromagnetic shielding coating.

[0052] Its performance parameters are as follows:

[0053] 1GHz shielding effectiveness is 65db, 3GHz shielding effectiveness is 67db, and 10GHz shielding effectiveness is 70db.

Embodiment 3

[0055] A preparation process of a lightweight high-performance electromagnetic shielding coating, comprising the steps of:

[0056] Put 24% of the hollow silver fiber, 5% of absolute ethanol, and 7% of butanol in a magnetic stirring tank and stir evenly, control the speed not to exceed 50 rpm, slowly add 0.8% of the dispersant dropwise, and mix well;

[0057] Pour the remaining 5% absolute ethanol and 7% butanol into the above-mentioned hollow silver fiber slurry, oscillate ultrasonically, and slowly add the resin mixture while oscillating for 15 minutes;

[0058] Finally, 0.2% of the anti-sedimentation wax slurry is added, stirred and mixed to obtain a light-weight high-performance electromagnetic shielding coating.

[0059] Its performance parameters are as follows:

[0060] 1GHz shielding effectiveness is 67db, 3GHz shielding effectiveness is 70db, and 10GHz shielding effectiveness is 75%.

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Abstract

The invention relates to a light-weight high-performance electromagnetic shielding paint and its preparation process and construction process, comprising 30-60% of resin mixture; 12-30% of hollow silver fiber; 5-20% of absolute ethanol; 5-20% of butanol %; dispersant 0.3‑2%; anti-settling wax slurry 0.1‑0.2%. The present invention aims at the hollowing treatment of common metal fibers at present, reduces the amount of metal used, thereby reducing the surface density; through the hollowing treatment of metal fibers, the electromagnetic wave reflection attenuation is increased to achieve higher shielding efficiency; by improving the resin system, it is realized in Normal use under low temperature and hot conditions; through the design of the coating process, the fibers in the coating can be effectively overlapped to achieve a larger pigment volume concentration (PVC), enhance the shielding effect, and take into account the mechanical properties of the coating.

Description

Technical field: [0001] The invention relates to the technical field of paint processing, in particular to a light-weight high-performance electromagnetic shielding paint and its preparation process and construction process. Background technique: [0002] At present, electromagnetic shielding coatings generally use metal or carbon-based conductive materials to shield electromagnetic waves. Metal materials such as silver and copper have better shielding performance in high-frequency bands, but ordinary metal materials have a larger proportion. A lower surface density of the coating cannot be obtained; the conductivity of the carbon-based material is slightly poor, the shielding performance is limited, and the shielding efficiency is not high enough. [0003] Common electromagnetic shielding paint binders use epoxy resin, polyurethane resin, etc., which are not very good at low temperature and cold brittleness. [0004] Common electromagnetic shielding coatings need to achiev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D129/14C09D179/04C09D165/00C09D149/00C09D5/24B05D7/04B05D7/00B05D7/24
CPCC09D129/14C09D179/04C09D165/00C09D149/00C09D5/24C09D5/18B05D7/04B05D7/584B05D7/24C08L2205/035C08L2201/08C08L79/04C08L65/00C08L49/00C08K7/24C08L29/14
Inventor 王宏辉马年
Owner 江苏朝晖涂装工程有限公司
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