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Preparation method of absorption type flexible transparent electromagnetic shielding film and product

An electromagnetic shielding and absorbing technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of difficulty in reconciling shielding effectiveness and light transmittance, secondary electromagnetic radiation pollution, and complicated electromagnetic environment, and achieve excellent electromagnetic absorption Wave ability, overcome the poor bending fatigue characteristics, and avoid the effect of secondary electromagnetic radiation pollution

Inactive Publication Date: 2020-07-17
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal nanowire transparent electromagnetic shielding films, such as silver nanowire transparent electromagnetic shielding films, currently have two major problems: on the one hand, shielding effectiveness and light transmittance are a pair of contradictions that are difficult to reconcile
The increase of silver nanowire content helps to build a dense conductive network, improve the conductivity of the film and obtain high shielding efficiency, but the increase of silver nanowire content will inevitably lead to a decrease in light transmittance; on the other hand, the main reflection mechanism The shielding is easy to cause secondary electromagnetic radiation pollution
The silver nanowire network is a reflective shielding material, which mainly realizes electromagnetic shielding by reflecting most of the incident electromagnetic waves back. However, the reflected electromagnetic waves are not dissipated, which will cause secondary electromagnetic radiation pollution and make the electromagnetic environment complication

Method used

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  • Preparation method of absorption type flexible transparent electromagnetic shielding film and product
  • Preparation method of absorption type flexible transparent electromagnetic shielding film and product
  • Preparation method of absorption type flexible transparent electromagnetic shielding film and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare an absorbing flexible transparent electromagnetic shielding film, the schematic diagram of the preparation process is as follows figure 1 Shown:

[0040] (1) After the glass substrate is ultrasonically cleaned with a cleaning agent, it is alternately rinsed with deionized water and absolute ethanol for 3 times, and then dried with high-purity nitrogen, and set aside;

[0041] (2) Scrape-coat polyurethane with a viscosity of 1000mPa.s on the glass substrate treated in step (1) and solidify at 80° C. for 0.5 h to obtain a flexible transparent polymer film layer I with a thickness of 150 μm;

[0042] (3) Mix hydroxypropyl methylcellulose and deionized water at a mass ratio of 3.5:1, and use a shaker to mix at a speed of 120r / min for 1 hour to form solution A; mix Sago-dispersant 9760 and deionized water by mass Mix at a ratio of 1:9, and use a shaker to mix at a speed of 100r / min for 1 hour to form solution B; the iron nanowires with an average wire diameter of 80...

Embodiment 2

[0045] Preparation of an Absorbent Flexible Transparent Electromagnetic Shielding Film

[0046] (1) After ultrasonically cleaning the polyethylene terephthalate plastic substrate with a cleaning agent, rinse it alternately with deionized water and absolute ethanol for 5 times, then dry it with high-purity argon, and set aside;

[0047] (2) Roll-coat polydimethylsiloxane with a viscosity of 200mPa.s on the plastic substrate treated in step (1) with a Meyer rod and cure at 40°C for 45min to obtain a flexible film with a thickness of 150μm. Transparent polymer film layer I;

[0048] (3) Mix cyclohexanol and deionized water at a mass ratio of 5:1, and use a shaker to mix at a speed of 200r / min for 0.5h to form solution A; mix polyethylene glycol and deionized water at a mass ratio of 1:6 , use a shaker to mix at a speed of 180r / min for 45min to form solution B; soak nickel nanowires with an average wire diameter of 100nm, an average wire length of 25μm, and an aspect ratio of 250...

Embodiment 3

[0051] Preparation of an Absorbent Flexible Transparent Electromagnetic Shielding Film

[0052] (1) After the ceramic substrate is ultrasonically cleaned with a cleaning agent, it is alternately rinsed 4 times with deionized water and absolute ethanol, then dried with high-purity nitrogen, and set aside;

[0053] (2) Print Ecoflex dimples with a viscosity of 50 mPa.s onto the ceramic substrate treated in step (1) and solidify at 60° C. for 30 minutes to obtain a flexible transparent polymer film layer I with a thickness of 80 μm;

[0054] (3) Mix hydroxyethyl cellulose and deionized water at a mass ratio of 1.5:1, and use a shaker to mix at a speed of 150r / min for 45 minutes to form solution A; mix sodium sulfamate and deionized water at a mass ratio of 1 : 8 mixed, utilizing a shaker to form solution B after mixing with a speed of 100r / min for 30min; the average wire diameter is 160nm, the average wire length is 32 μm, and the aspect ratio is 200 cobalt nanowires with a conce...

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Abstract

The invention relates to a preparation method of an absorption type flexible transparent electromagnetic shielding film and a product, and belongs to the technical field of electromagnetic shielding.The preparation method comprises the following steps of sequentially coating and preparing the flexible transparent polymer film layer I, the ferromagnetic nanowire network structure layer and a flexible transparent polymer film layer II on a cleaned substrate, and applying a magnetic field to enable the ferromagnetic nanowires to be distributed to form an ordered network structure when the ferromagnetic nanowire network structure layer is coated and prepared. The shielding film prepared by the method is high in shielding effectiveness, high in light transmittance, good in flexibility and excellent in electromagnetic wave absorbing capacity, the secondary electromagnetic radiation pollution caused by the shielding mainly based on a reflection mechanism can be effectively avoided, the shielding film has good engineering application potential, and the preparation method is simple, is low in raw material cost, and is easy to operate and industrialize.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to a preparation method and product of an absorbing flexible transparent electromagnetic shielding film. Background technique [0002] Electromagnetic radiation pollution has become one of the most important physical pollution of the ecological environment in the 21st century. Severe electromagnetic radiation interference not only affects normal wireless communication, endangers the safe and stable operation of instruments and equipment, directly or indirectly causes serious economic losses and casualties, but also long-term strong electromagnetic radiation may cause some tissue lesions, thus seriously threatening the human body healthy. For this reason, scholars at home and abroad have been devoting themselves to developing effective electromagnetic shielding materials to reduce or even eliminate the adverse effects of electromagnetic radiation, and h...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 杨平安李锐卢毅刘琳苟欣向臣烨
Owner CHONGQING UNIV OF POSTS & TELECOMM
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