Lightweight broadband electromagnetic shielding coating and preparation method thereof

An electromagnetic shielding coating and electromagnetic shielding technology, applied in conductive coatings, epoxy resin coatings, coatings, etc., can solve the problems of poor dispersion uniformity of absorbents or conductive powders, limit the development of electromagnetic shielding coatings, and reduce the practicability of materials. Achieve the effects of improving mechanical and physical properties, improving electromagnetic shielding efficiency, and reducing surface density

Pending Publication Date: 2021-11-09
青岛九维华盾科技研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, electromagnetic shielding coatings generally have problems such as high surface density of coatings, poor dispersion uniformity of absorbents or conductive powders, and insufficient shielding performance at low coating thicknesses, which greatly reduces the practicability of materials and limits the development of electromagnetic shielding coatings.

Method used

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  • Lightweight broadband electromagnetic shielding coating and preparation method thereof
  • Lightweight broadband electromagnetic shielding coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A light broadband electromagnetic shielding coating, comprising the following materials: 10 parts of polyurethane modified epoxy resin, 2 parts of cellulose acetate butyrate, 30 parts of electromagnetic shielding filler (2.73 parts of PS microspheres, 13.64 parts of silver powder, silver-coated copper powder 13.64 parts), DREWPLUS L-1311 (defoamer) 0.2 parts, dimethylsiloxane (leveling agent) 0.3 parts, YJ-16-3 (emulsifier) ​​1 part, ethyl acetate / PMA mixed solvent (volume ratio 1:1) 56.5 parts.

[0030] The preparation process is as follows: (1) Add polyurethane modified epoxy resin, DREWPLUS L-1311, dimethyl siloxane and ethyl acetate / PMA mixed solvent into the mixing kettle, and stir for 30 minutes at a stirring speed of 500 rpm , mix evenly to obtain mixture a; (2) then slowly add PS microspheres, silver powder, silver-coated copper powder and YJ-16-3 to mixture a in sequence, then adjust the speed to 500 rpm and stir for 20 minutes to obtain a uniform (3) Filter t...

Embodiment 2

[0032] A light broadband electromagnetic shielding coating, comprising the following materials: 10 parts of polyurethane modified epoxy resin, 2 parts of cellulose acetate butyrate, 50 parts of electromagnetic shielding filler (wherein 4.55 parts of PS microspheres, 22.73 parts of silver powder, silver-coated copper powder 22.73 parts), DREWPLUS L-1311 (defoamer) 0.2 parts, dimethylsiloxane (leveling agent) 0.3 parts, YJ-16-3 (emulsifier) ​​0.1 parts, ethyl acetate / PMA mixed solvent (volume fraction 1:1) 37.4 parts.

[0033] The preparation process is as follows: (1) Add polyurethane modified epoxy resin, DREWPLUS L-1311, dimethyl siloxane and ethyl acetate / PMA mixed solvent into the mixing kettle, and stir for 30 minutes at a stirring speed of 500 rpm , mix evenly to obtain the first mixture; (2) then slowly add PS microspheres, silver powder, silver-coated copper powder and YJ-16-3 to the first mixture, then adjust the rotating speed to 600 rpm, and stir for 25 minutes, Obt...

Embodiment 3

[0035] A light-weight broadband electromagnetic shielding coating, comprising the following materials: 5 parts of polyurethane modified epoxy resin, 2 parts of cellulose acetate butyrate, 48.4 parts of electromagnetic shielding filler (wherein 4.4 parts of PS microspheres, 22 parts of silver powder, silver-coated copper powder 22 parts), DREWPLUSL-1311 (defoamer) 0.2 parts, dimethylsiloxane (leveling agent) 0.3 parts, YJ-18-MS (emulsifier) ​​0.5 parts, ethyl acetate / PMA mixed solvent ( Volume fraction 1:1) 43.6 parts.

[0036] The preparation process is as follows: (1) Add polyurethane modified epoxy resin, DREWPLUS L-1311, dimethyl siloxane and ethyl acetate / PMA mixed solvent into the mixing kettle, and stir for 30 minutes at a stirring speed of 500 rpm , mix well to obtain the second mixture; (2) then slowly add PS microspheres, silver powder, silver-coated copper powder and YJ-18-MS to the first mixture, then adjust the rotating speed to 600 rpm, and stir for 25 minutes, O...

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Abstract

The invention belongs to the technical field of functional coatings, and particularly relates to a lightweight broadband electromagnetic shielding coating and a preparation method thereof, the lightweight broadband electromagnetic shielding coating comprises the following components in parts by weight: 5-10 parts of resin, 2-8 parts of cellulose acetate butyrate, 30-50 parts of an electromagnetic shielding filler, 0.1-2 parts of an antifoaming agent, 0.1-2 parts of a leveling agent, 0.1-2 parts of an emulsifier, and 10-50 parts of a solvent. The lightweight broadband electromagnetic shielding coating is designed and prepared through a PS microsphere/silver powder/silver coated copper powder composite electromagnetic shielding filler, and the problems that a traditional electromagnetic shielding coating is uneven in dispersion, small in shielding and absorption frequency range, low in shielding effectiveness and large in coating density are effectively solved.

Description

technical field [0001] The invention generally relates to the technical field of functional coatings, in particular to a lightweight broadband electromagnetic shielding coating and a preparation method thereof. Background technique [0002] With the rapid development of the electronic information industry, electrical and electronic equipment has been widely used in all walks of life. While they provide great convenience to people's lives, they also expose serious electromagnetic pollution problems. [0003] Electromagnetic shielding coating, as a fluid material, can be coated on the surface of substrates with any structure, and has the advantages of convenient and fast construction, strong practicability and high cost performance. However, at present, electromagnetic shielding coatings generally have problems such as high surface density of coatings, poor dispersion uniformity of absorbents or conductive powders, and insufficient shielding performance at low coating thicknes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/24C09D7/65C09D7/47
CPCC09D163/00C09D5/24C09D7/65C09D7/47C08K2003/085C08K2003/0806C08K2201/001C08L1/14C08K9/10C08K3/08
Inventor 王向伟彭锐晖沙建军杨高峰薛参柳林
Owner 青岛九维华盾科技研究院有限公司
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