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A kind of electromagnetic shielding coating suitable for heat shrinkable material and preparation method thereof

An electromagnetic shielding coating and thermal shrinkage technology, applied in conductive coatings, anti-fouling/underwater coatings, polyurea/polyurethane coatings, etc., can solve the problems of easy wrinkling and cracking, reduce the amount of conductive fillers, and reduce costs Effect

Active Publication Date: 2022-08-05
广东粤港澳大湾区黄埔材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve high shielding performance, ordinary electromagnetic shielding coatings generally add more than 70% conductive fillers to promote the formation of conductive networks, so that the heat shrinkable tubes after coating are easy to wrinkle and crack after heat shrinkage

Method used

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  • A kind of electromagnetic shielding coating suitable for heat shrinkable material and preparation method thereof
  • A kind of electromagnetic shielding coating suitable for heat shrinkable material and preparation method thereof
  • A kind of electromagnetic shielding coating suitable for heat shrinkable material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 3g of bisphenol A type polyethersulfone was dissolved in 97g of tetrahydrofuran, followed by 28.5g of silver nanowires, 28.5g of flake silver powder and 11.4g of tin-bismuth alloy (43 / 57, melting point 138°C, manufacturer: Shenzhen City Junlin Technology Development Co., Ltd.) was added into the above solution, stirred evenly to obtain conductive filler dispersion, then atomized the conductive filler dispersion with a spray gun, and obtained the composite conductive filler after natural drying.

[0028] Add 100 parts of aqueous polyurethane dispersion (solid content 30%), 5 parts of organic bentonite; 70 parts of composite conductive filler; 5 parts of hydroxyethyl cellulose; Stirring for 1 h at a rotating speed to obtain a water-based polyurethane electromagnetic shielding coating.

[0029] The water-based polyurethane electromagnetic shielding coating obtained in Example 1 was sprayed on the surface of the polyethylene heat-shrinkable tube, the surface was flat, the d...

Embodiment 2

[0031] 5g of biphenyl-type polyethersulfone was dissolved in 95g of tetrahydrofuran, followed by 15g of copper nanowires, 30g of flake silver-coated copper powder and 4.5g of tin-bismuth alloy (67 / 33, melting point 166°C, manufacturer: Shenzhen Junlin Technology Development Co., Ltd.) was added into the above solution, stirred evenly to obtain conductive filler dispersion, then atomized the conductive filler dispersion with a spray gun, and obtained the composite conductive filler after natural drying.

[0032] Add 100 parts of aqueous polyurethane dispersion (solid content 30%), 3 parts of fumed silica; 30 parts of composite conductive filler; 2 parts of carboxymethyl cellulose; Stir for 0.5 h at a rotating speed of 1 min to obtain a water-based polyurethane electromagnetic shielding coating.

Embodiment 3

[0034] 3g of bisphenol A type polyethersulfone was dissolved in 97g of tetrahydrofuran, then 28.5g of gold nanowires, 28.5g of flake copper powder and 11.4g of tin-bismuth alloy (43 / 57) were added to the above solution, Stir evenly to obtain a conductive filler dispersion, then atomize the conductive filler dispersion with a spray gun, and obtain a composite conductive filler after natural drying.

[0035] Add 100 parts of aqueous polyurethane dispersion (solid content 30%), 4 parts of organic bentonite; 50 parts of composite conductive filler; 4 parts of hydroxyethyl cellulose; Stirring for 1 h at a rotating speed to obtain a water-based polyurethane electromagnetic shielding coating.

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PUM

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Abstract

The invention belongs to the field of coatings, and discloses an electromagnetic shielding coating suitable for heat shrinkable materials and a preparation method thereof. Add into the above solution, stir evenly to obtain conductive filler dispersion, then atomize the conductive filler dispersion, and obtain composite conductive filler after drying; (2) mix water-based polyurethane dispersion, anti-settling agent, composite conductive filler, Thickener and defoamer are mixed, and then stirred uniformly to obtain water-based polyurethane electromagnetic shielding coating. The low-melting-point alloy of the invention melts during the heating and shrinking process of the heat-shrinkable material, promotes the conductive filler to form a conductive network, increases the shielding performance of the shielding coating through the heat-shrinking process, and avoids wrinkling and cracking caused by the addition of excessive rigid metal fillers. Realize the low addition and high shielding properties of the coating.

Description

technical field [0001] The invention belongs to the field of coatings, and relates to an electromagnetic shielding coating suitable for heat shrinkable materials and a preparation method thereof. Background technique [0002] The development of electronic information technology brings great convenience to people, but also produces a lot of electromagnetic pollution. A large amount of electromagnetic pollution not only affects the normal operation of instruments and equipment, but also the leakage of electromagnetic waves will endanger national information security and the security of military core secrets. Especially the emerging 5G communication field and aerospace field have stricter requirements on the anti-interference ability of signals. [0003] Transmission cables and connectors of electronic equipment are one of the most prone to electromagnetic leakage, and the use of electromagnetic shielding heat shrinkable tubes is an effective solution to this problem. The ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D5/24C09D7/65C09D5/14
CPCC09D175/04C09D5/24C09D7/65C09D5/14C08K2201/001C08L2201/08C08K2201/011C08L81/06C08K3/08C08K7/06C08K7/00
Inventor 聂伟王春博冉祥海付超钱景
Owner 广东粤港澳大湾区黄埔材料研究院
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