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Civil air defence electromagnetic shielding coating and preparation method thereof

A technology for electromagnetic shielding coatings and civil air defense projects, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor electromagnetic shielding, poor high-frequency shielding effect, and reduced conductivity, and achieve wide shielding frequency band and good shielding effect Effect

Inactive Publication Date: 2010-01-20
徐瑞龙 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the 21st century, the development of the electronic industry and the high application of electronic equipment have greatly promoted the progress of science and technology and people's lives, but at the same time it has also brought a lot of electromagnetic radiation pollution
[0005] Generally speaking, this kind of electromagnetic shielding coating is mainly composed of conductive metal powder and conductive polymer film-former, but due to the limitations of these two materials, it is often difficult to achieve high shielding effectiveness
For example: the price of metal powder silver is high, the shielding effect is poor at high frequencies, copper and nickel are easy to oxidize, and the conductivity is reduced; the conductive polymer polyaniline is not ideal, and the electromagnetic shielding is poor.

Method used

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  • Civil air defence electromagnetic shielding coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Oily primer

[0043] Acrylic modified silicone resin 35kg, electroless silver-plated carbon fiber 28kg, conductive polyaniline 8kg, leveling agent 0.5kg, dispersant 0.5kg, defoamer 0.2kg, anti-sedimentation agent 4kg, the mass ratio is 1:1:2 Add 23.8kg of the mixed solvent of butyl acetate, ethyl acetate and No. 200 solvent oil to the high-speed disperser, disperse at high speed for 30 minutes, and sand it three times with a sand mill until the fineness is 100um.

[0044] (2) Oily finish

[0045] 45kg of acrylic modified silicone resin, 5kg of modified nano-indium tin oxide, 1kg of dispersant, 0.5kg of leveling agent, 4kg of anti-sedimentation agent, 0.3kg of defoamer, and butyl acetate with a mass ratio of 1:1:2 , ethyl acetate and No. 200 solvent oil mixed solvent 44.2kg, put into the dispersing barrel, disperse with ultrasonic wave for 1.5h, and check that the transmittance reaches 75%.

[0046] The method of painting is spraying. First, clean the object to be...

Embodiment 2

[0048] (1) Water-based primer

[0049] Put 23kg of water and 0.5kg of 250HBR cellulose into a high-speed disperser to disperse for 30 minutes, then add 35kg of chemically silver-plated carbon fiber, 8kg of conductive polyaniline, 0.6kg of leveling agent, 0.5kg of dispersant, and 0.4kg of defoamer, and disperse at high speed. Disperse for 1 hour, add 32kg of water-based acrylic resin, and mix slowly for 30 minutes.

[0050] (2) Water-based topcoat

[0051] Put 42.7kg of water and 0.5kg of 250HBR cellulose into the dispersion bucket to disperse for 30 minutes, then put 5kg of modified nano-indium tin oxide, 1kg of dispersant, 0.5kg of leveling agent, 0.3kg of defoamer, and 50kg of water-based polyurethane resin, Put it into the dispersing barrel and disperse it with ultrasonic waves for 1.5h, and then check that the transparency reaches 75%.

[0052] The method of application is roller coating. First, clean the object to be coated so that there is no dust, no oil, and no rust...

Embodiment 3

[0054] (1) Oily primer

[0055] 35kg of epoxy-modified silicone resin, 32kg of electroless silver-plated carbon fiber, 8kg of conductive polyaniline, 0.8kg of leveling agent, 1kg of dispersant, 0.2kg of defoamer, 3kg of anti-sedimentation agent, the mass ratio is 1:1:2 Add 20kg of the mixed solvent of butyl acetate, ethyl acetate and No. 200 solvent oil to a high-speed disperser for high-speed dispersion for 50 minutes, and sand it three times with a sand mill until the fineness reaches 100um.

[0056] (2) Oily finish

[0057]50kg of epoxy-modified silicone resin, 5kg of modified nano-tin antimony oxide, 1.2kg of dispersant, 0.5kg of leveling agent, 3.8kg of anti-sedimentation agent, 0.4kg of defoamer, and a mass ratio of 1:1:2 Put 39.1kg of mixed solvent of butyl acetate, ethyl acetate and No. 200 mineral spirits into the dispersion bucket, disperse with ultrasonic waves for 1.6h, and check that the transmittance reaches 80%.

[0058] The brushing method adopts brushing. F...

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Abstract

The invention discloses a civil air defence electromagnetic shielding coating which can be divided to oil-based coating and water-based coating. The coating comprises base coat and finishing coat, wherein, the base coat comprises the following components by weight percent: 25-35% of film forming matter, 40-50% of conductive filler, 5-6% of additive and 20-35% of solvent, and the finishing coat comprises the following components by weight percent: 45-55% of film forming matter, 5-6% of nanometer oxide, 2-4% of additive and 35-45% of solvent. The coating of the invention has good physical and chemical properties and wide frequency band masking, can prevent electromagnetic interference, has positive effect for preventing threat of electromagnetic radiation to electronic equipments and human health and can be applicable to being used in constructions, electronic equipments and the like; the preparation method is simple, the device and technological requirements are not high so that the method is applicable to industrialized production.

Description

technical field [0001] The invention relates to an electromagnetic shielding coating, in particular to an electromagnetic shielding coating for civil air defense engineering and a preparation method thereof. Background technique [0002] Since the 21st century, the development of the electronic industry and the high application of electronic equipment have greatly promoted the progress of science and technology and people's lives, but at the same time it has also brought a lot of electromagnetic radiation pollution. Electromagnetic wave radiation will not only affect the normal use of electronic equipment, but also cause information leakage, and more importantly, it will cause harm to people's health. Now, electromagnetic wave radiation has become the fourth largest public hazard that threatens human survival and safety after noise pollution, air pollution and water pollution. [0003] Traditional electromagnetic shielding materials use metal sheets or metal meshes. Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/00C09D183/04C09D175/04C09D127/12C09D133/00
Inventor 马成夫徐瑞龙
Owner 徐瑞龙
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