Water-based absorption type electromagnetic shielding coating material and preparation method thereof

A technology of electromagnetic shielding and coating materials, applied in the direction of radiation-absorbing coatings, coatings, reflection/signal coatings, etc., can solve the problems of narrow absorption bandwidth of composite films, narrow absorption bandwidth of electromagnetic shielding materials, and inability to absorb electromagnetic waves, etc., to achieve Broaden the absorption bandwidth, thin thickness, and improve the effect of impedance matching

Inactive Publication Date: 2022-03-04
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composite thin film realizes the construction of a "absorbing-reflecting" double-layer structure by utilizing the characteristics of the natural settlement of the density of the silver-plated four-corner needle-shaped zinc oxide. Because the conductivity of the underlying material is too high, its input impedance is close to that of a pure metal substrate, so The high conductive bottom layer can only reflect electromagnetic waves, and the absorption bandwidth of the composite film is narrow, only about 3GHz
Therefore, the absorption bandwidth of the existing double-layer structure absorbing electromagnetic shielding material is narrow, because its highly conductive layer can only reflect electromagnetic waves but cannot absorb electromagnetic waves

Method used

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  • Water-based absorption type electromagnetic shielding coating material and preparation method thereof
  • Water-based absorption type electromagnetic shielding coating material and preparation method thereof
  • Water-based absorption type electromagnetic shielding coating material and preparation method thereof

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preparation example Construction

[0026] The invention discloses a preparation method of a water-based electromagnetic shielding coating material. The specific steps are as follows:

[0027] 1) Use the self-polymerization reaction of dopamine hydrochloride to modify graphene under weak alkaline conditions to obtain polydopamine-modified graphene GNS@PDA, blend 10-20wt% GNS@PDA with anionic polyacrylate latex, and coat on solid On the substrate, after drying, a polyacrylate / GNS@PDA composite coating with a thickness of 0.2mm-0.45mm is obtained;

[0028] 2) Treat graphene oxide (GO) in a vacuum oven with a vacuum degree of -1bar at 200°C for 4h to obtain reduced graphene oxide (RGO), and blend 8-20wt% of RGO with anionic polyacrylate latex, Directly coat the polyacrylate / RGO composite latex on the polyacrylate / GNS@PDA composite coating prepared in step (1) to obtain a polyacrylate / RGO coating with a thickness of 1.3mm-2.2mm, after drying A water-based absorbing electromagnetic shielding coating material is obta...

Embodiment 1

[0033] 1) Add 0.5 g of dopamine hydrochloride to 300 mL of Tris buffer and 100 mL of ethanol at room temperature, and use its self-polymerization reaction to modify 1 g of graphene under weak alkaline conditions (pH value=8.5). After 24 hours of reaction, Suction filtration and rinse with water to obtain GNS@PDA. Then take 1g of the above-prepared GNS@PDA and 10.81g of anionic polyacrylate latex Yanbang 141, disperse evenly under the action of ultrasonic waves in a water bath, spray on a square polytetrafluoroethylene substrate with a side length of 12.9cm, and obtain a thickness of 0.2mm after drying The polyacrylate / GNS@PDA coating, wherein the mass fraction of GNS@PDA in the solid mass of the coating is 20wt%.

[0034] 2) Take 11g of GO and heat it to 200°C for 4 hours in a vacuum oven with a vacuum degree of -1bar to prepare RGO. Take 6.5g of RGO and 70.3g of anionic polyacrylate latex Yanbang 141 and disperse them under the action of ultrasonic waves in a water bath Even...

Embodiment 2

[0037] 1) Add 0.5 g of dopamine hydrochloride to 300 mL of Tris buffer and 100 mL of ethanol at room temperature, and use its self-polymerization reaction to modify 1 g of graphene under weak alkaline conditions (pH value=8.5). After 24 hours of reaction, Suction filtration and rinse with water to obtain GNS@PDA. Then take 0.4g of the above-prepared GNS@PDA and 10.3g of anionic polyacrylate latex Mage AR-1053 and disperse evenly under the action of ultrasonic waves in a water bath, and brush on a square polyimide substrate with a side length of 10cm. After drying, 0.45 mm thick polyacrylate / GNS@PDA coating, where the mass fraction of GNS@PDA in the solid mass of the coating is 10 wt%.

[0038] 2) Take 2g of GO and heat it to 200°C for 4 hours in a vacuum oven with a vacuum degree of -1bar to prepare RGO. Take 1.15g of RGO and 37.7g of anionic polyacrylate latex Mage AR-1053 under the action of ultrasonic waves in a water bath Disperse evenly, brush on the polyacrylate / GNS@PDA...

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Abstract

The invention discloses a water-based absorption type electromagnetic shielding coating material and a preparation method thereof, and belongs to the technical field of water-based coating preparation, and the preparation method comprises the following specific steps: blending GNS (at) PDA and water-based anionic polyacrylate latex, coating on a solid substrate, and drying to obtain a polyacrylate / GNS (at) PDA composite coating with the thickness of 0.2-0.45 mm; the preparation method comprises the following steps: reducing GO into RGO under a vacuum condition, and blending the RGO with water-based anionic polyacrylate latex to obtain polyacrylate / RGO composite latex; the polyacrylate / RGO composite latex is coated on the polyacrylate / GNS (at) PDA composite coating, drying is carried out, the water-based absorption type electromagnetic shielding coating material is obtained, and the thickness of the polyacrylate / RGO coating ranges from 1.3 mm to 2.2 mm. According to the invention, a double-layer structure of'wave absorbing layer-reflection wave absorbing layer 'is constructed, and the wave absorbing capability of the bottom layer material is effectively exerted, so that the integral impedance matching of the material is improved, the absorption bandwidth of the material is widened, and the total absorption shielding in the X wave band is realized.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding coating materials, in particular to a water-based absorbing electromagnetic shielding coating material and a preparation method thereof. Background technique [0002] With the explosive application of communication equipment, electromagnetic pollution has attracted more and more attention. Electromagnetic pollution not only interferes with the normal operation of electronic equipment, causing equipment noise, flickering screens, and even downtime, but also endangers human health, causing dizziness, headaches, and even cancer. Therefore, it is urgent to control electromagnetic pollution. Absorbing materials can effectively absorb dissipated electromagnetic waves, but the use of absorbing materials must rely on metal substrates, and all their performance is also based on the attachment to metal substrates, which greatly limits their practical applications. Therefore, the market s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/04C09D5/32C09D5/33C09D7/62C09D7/61B05D1/38B05D5/12B05D7/00B05D7/24
CPCC09D133/04C09D5/32C09D5/004C09D7/62C09D7/61B05D5/12B05D7/24B05D7/544B05D7/546B05D1/38C08K9/08C08K3/042
Inventor 张文博卫林峰马建中王佳宁
Owner SHAANXI UNIV OF SCI & TECH
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