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Electromagnetic shielding coating, and preparation method and application thereof

A technology of shielding coatings and electromagnetic shielding, applied in conductive coatings, magnetic field/electric field shielding, antifouling/underwater coatings, etc., can solve the problems of limited magnetic field shielding effectiveness in the middle and low frequency bands, and achieve low density, convenient construction, and response frequency bands wide effect

Active Publication Date: 2018-05-15
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electromagnetic shielding filler obtained by this method mainly plays the role of electric loss, and only has a shielding effect on medium and high frequencies, and has limited magnetic field shielding effectiveness on medium and low frequencies.

Method used

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  • Electromagnetic shielding coating, and preparation method and application thereof
  • Electromagnetic shielding coating, and preparation method and application thereof
  • Electromagnetic shielding coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 A kind of preparation method of ferrite / graphene composite material (electromagnetic shielding filler)

[0039] The present embodiment provides a kind of preparation of ferrite / graphene composite material, comprising:

[0040] (1) Preparation of Fe(NO 3 ) 3 - Aqueous dispersion solution of graphene oxide.

[0041] Fe(NO 3 ) 3 Joining concentration is in the aqueous dispersion liquid of graphene oxide of 5mg / ml, prepares Fe(NO 3 ) 3 A water-dispersible solution with a concentration of 10 mg / ml.

[0042] (2) Melamine sponge impregnated to absorb Fe(NO 3 ) 3 - Graphene oxide solution.

[0043] The melamine sponge was impregnated with Fe(NO 3 ) 3 - After 2 hours in the water dispersion solution of graphene oxide, take it out and dry it at 110° C. for 12 hours.

[0044] (3) High-temperature treatment to prepare lightweight and high-efficiency FeOx / graphene electromagnetic shielding fillers.

[0045] The dried Fe(NO 3 ) 3 -The graphene oxide / sponge...

Embodiment 2

[0047] Embodiment 2 Preparation of an electromagnetic shielding coating

[0048]The present embodiment provides a kind of preparation method of barrier paint, comprising:

[0049] (1) Add 30g of GK570 fluorocarbon resin, 15g of FTH elastic polyester resin, 0.5g of Deqian 6800 additives, 0.5g of BYK110 additives, 0.5g of EFKA2020 additives, and 0.5g of EFKA3777 additives into 7g of mixed solvent and mix, stirring , slowly add 30 g of the electromagnetic shielding filler obtained in Example 1, after the dispersion is uniform, grind to a fineness of 40 μm, add the remaining 3 g of mixed solvent, adjust the viscosity of the system to 800-1000 cp, filter, and discharge to obtain the first component;

[0050] Described mixed solvent is made up of xylene 3.5g, ethyl acetate 3g, cyclohexanone 3.5g.

[0051] (2) A, B components (isocyanate N3390) according to the molar ratio (-OH) 甲 :(-NCO) 乙 = 1:1 mixing, stirring evenly, that is, the electromagnetic shielding coating is prepared. ...

Embodiment 3

[0053] The present embodiment provides a kind of preparation method of shielding coating similar to embodiment 2, and difference is only wherein the formula of first component is as follows:

[0054] GK570 fluorocarbon resin 25g, FTH elastic polyester resin 25g, 6800 additive 0.3g, BYK110 additive 0.6g, EFKA2020 additive 0.3g, EFKA3777 additive 0.6g, mixed solvent 5g, electromagnetic shielding filler 20g.

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Abstract

The invention relates to a shielding coating and a preparation method and application thereof. The shielding coating is formed by mixing a component A and a component B with the mole ratio of (-OH): (-NCO) being 1:1, wherein the component A is prepared from the following raw materials in parts by weight: 25 to 55 parts of fluorine-modified acrylic resin, 5 to 25 parts of elastic polyester resin, 20 to 30 parts of an electromagnetic shielding filler, 1.5 to 4 parts of an assistant, and 5 to 10 parts of a mixed solvent; and the component B adopts isocyanate. The electromagnetic shielding coatinghas electric conductive and magnetic conductive characteristics, and is wide in electromagnetic shielding response frequency band; the electromagnetic shielding coating is low in density, and meets the development direction of light weight; and the coating is convenient for construction, and can be coated in brush coating, spray coating and roll coating manners.

Description

technical field [0001] The invention relates to a light-weight and high-efficiency graphene-based electromagnetic shielding paint for rail vehicles and a preparation method thereof, belonging to the technical field of functional materials. Background technique [0002] The electromagnetic shielding coating greatly reduces the energy of the incident electromagnetic wave through reflection, absorption and multiple reflections of the incident electromagnetic wave, and plays an electromagnetic shielding role. Existing electromagnetic shielding coatings are mainly conductive coatings, and the conductive fillers added are generally metal powders such as gold, silver, copper, nickel, and non-metallic powders such as carbon black and graphite. Gold powder and silver powder have good electrical conductivity and chemical stability, and have been used in key electronic equipment such as spacecraft, aircraft, and ships, but they are expensive and dense, and their use in large areas is l...

Claims

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Application Information

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IPC IPC(8): C09D127/12C09D175/06C09D5/16C09D7/61C09D5/24H05K9/00
CPCC08L2201/04C08L2203/20C09D5/1662C09D5/24C09D127/12H05K9/0081C08L75/06C08K9/10C08K3/22C08K3/04C08K7/06
Inventor 孙琳徐跃冯玉明林鹏丁叁叁
Owner CRRC QINGDAO SIFANG CO LTD
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