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A low-frequency electromagnetic shielding coating for rail vehicles and its preparation method

An electromagnetic shielding coating and electromagnetic shielding technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of unformed product serialization and industrialization, scarce research on electromagnetic wave shielding coatings, etc., to achieve the effect of convenient construction

Active Publication Date: 2020-06-02
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the research on electromagnetic shielding coatings in my country is mainly concentrated in the band above 30MHz, and the research on electromagnetic shielding coatings in the range of DC to 10kHz is scarce, and the serialization and industrialization of products have not been formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 A kind of preparation method of electromagnetic shielding coating

[0022] The present embodiment provides a kind of preparation method of barrier paint, comprising:

[0023] (1) Add 14.8g of FTH elastic polyester resin, 0.5g of Deqian 6800 additive, 0.5g of BYK110 additive, 0.5g of EFKA2020 additive, and 0.5g of EFKA3777 additive into 7g of mixed solvent, stir, and slowly add TN70 iron Nickel alloy powder (nickel content 70%) 40g, molybdenum content is 4% permalloy powder 39g, after graphene 1g is uniformly dispersed, grind to fineness 40 μ m, add remaining 3g mixed solvent, adjust system viscosity to 800~1000cp, Filtrate, discharge, obtain A component;

[0024] Described mixed solvent is made up of xylene 3.5g, butyl acetate 3g, cyclohexanone 3.5g.

[0025] (2) Mix components A and B (isocyanate SF) according to the molar ratio (-OH) A: (-NCO) B = 1:1, and stir evenly to obtain an electromagnetic shielding coating.

[0026] The electromagnetic shieldin...

Embodiment 2

[0027] Embodiment 2 A kind of preparation method of electromagnetic shielding coating

[0028] The present embodiment provides a kind of preparation method of barrier paint, comprising:

[0029] (1) Add 22g of FTH elastic polyester resin, 0.4g of Deqian 6800 additives, 0.4g of BYK110 additives, 0.4g of EFKA2020 additives, and 0.5g of EFKA3777 additives into 7g of mixed solvent, stir, and slowly add TN70 iron nickel 70g of alloy powder (nickel content 70%), 9g of permalloy powder with molybdenum content of 4%, and after 1g of graphene are uniformly dispersed, grind to a fineness of 40 μm, add the remaining 3g of mixed solvent, adjust the viscosity of the system to 800~1000cp, filter , discharging to obtain component A;

[0030] Described mixed solvent is made up of xylene 3.5g, butyl acetate 3g, cyclohexanone 3.5g.

[0031] (2) Mix components A and B (isocyanate SF) according to the molar ratio (-OH) A: (-NCO) B = 1:1, and stir evenly to obtain an electromagnetic shielding co...

Embodiment 3

[0033] Embodiment 3 A kind of preparation method of electromagnetic shielding coating

[0034] The present embodiment provides a kind of preparation method of barrier paint, comprising:

[0035] (1) Add 21g of FTH elastic polyester resin, 0.5g of Deqian 6800 additive, 0.4g of BYK110 additive, 0.5g of EFKA2020 additive, and 0.4g of EFKA3777 additive into 7g of mixed solvent, stir, and slowly add TN80 iron nickel Alloy powder (nickel content 80%) 50g, molybdenum content is 5% permalloy powder 25g, after graphene 0.5g is uniformly dispersed, grind to fineness 40 μ m, add remaining 3g mixed solvent, adjust system viscosity to 800~1000cp, Filtrate, discharge, obtain A component;

[0036] Described mixed solvent is made up of xylene 3.5g, butyl acetate 3g, cyclohexanone 3.5g.

[0037] (2) Mix components A and B (isocyanate SF) according to the molar ratio (-OH) A: (-NCO) B = 1:1, and stir evenly to obtain an electromagnetic shielding coating.

[0038] The electromagnetic shieldin...

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PUM

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Abstract

The invention relates to a low-frequency electromagnetic shielding coating for rail vehicles and a preparation method of the low-frequency electromagnetic shielding coating. The low-frequency electromagnetic shielding coating is prepared from a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 5-25 parts of hydroxyl modified acrylic resin, 40-80 parts of shielding filler, 9-15 parts of mixed solvent and 1-4 parts of additives; the component B is hexamethylene diisocyanate (HDI); the molar ratio of -OH in the component A to -NCOin the component B is equal to 1 to 1. According to the preparation method, the hydroxyl modified acrylic resin with certain elasticity is used as a base material, and graphene and composite electromagnetic shielding filler such as iron-nickel alloy powder and permalloy powder are added as the filler, so that the coating is enabled to have shielding effectiveness at a low frequency band, and theshielding property of the coating is further improved.

Description

technical field [0001] The invention relates to a low-frequency electromagnetic shielding coating for rail vehicles and a preparation method thereof, belonging to the technical field of functional materials. Background technique [0002] Electromagnetic shielding coatings reduce the transmission energy of electromagnetic waves by reflecting, absorbing, multiple reflections and providing magnetic bypass to incident electromagnetic waves, and play an electromagnetic shielding role. Existing electromagnetic shielding coatings are mainly conductive coatings, and the added conductive fillers 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, but they are expensive and their use is limited. The performance of copper powder and nickel powder is similar to that of silver, but it is easy to oxidize, the conductivity is uns...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D175/06C09D7/61
CPCC09D7/61C09D175/04C09D175/06C08K3/08C08K3/04
Inventor 孙琳徐跃林鹏刘韶庆丁叁叁
Owner CRRC QINGDAO SIFANG CO LTD