An opaque film for electromagnetic shielding

A transparent film, electromagnetic shielding technology, applied in the fields of magnetic/electric field shielding, shielding materials, electrical components, etc., can solve the problems of affecting the durability of materials and continuous electromagnetic shielding efficiency, difficult to achieve industrialization, easy to peel and prepare costs, etc. Achieving good electromagnetic shielding efficiency, isolation impact, and long-lasting electromagnetic shielding effect

Active Publication Date: 2020-08-04
瑞年新材料(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN107557769A discloses a copper-nanotube composite material, which can greatly improve the electromagnetic shielding effectiveness of carbon nanotubes, but its mechanical properties are poor, it is easy to peel off and the preparation cost is high, and it is difficult to realize industrialization
[0005] CN93110575.7 discloses a polymer-based conductive composite material filled with conductive fillers, but it is easily corroded and aged by permeated oxygen, water, etc. in the environment, thereby affecting the durability of the material and the continuous electromagnetic Shielding effectiveness

Method used

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  • An opaque film for electromagnetic shielding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the ratio, prepare 65 parts by weight of polypropylene, 15 parts by weight of maleic anhydride modified polypropylene, 15 parts by weight of Ni powder and 5 parts by weight of Fe 3 O 4 Put it into a screw extruder, knead at 220°C and make a masterbatch, and then use a film blowing machine to make a film with a thickness of about 100μm as a polymer film matrix. Then in figure 1 In the vacuum deposition system shown, the two main surfaces of the polymer film substrate are coated with silicon oxide film by thermal evaporation. The pressure roller adopts an elastic rubber roller (temperature is 70℃) to apply the polymer film substrate. Extrusion force of 3MPa, and then through corona treatment (O 2 Plasma and then use a blown film machine to make a film with a thickness of about 100 μm as a polymer film matrix. (O 2 Plasma, the power is 300W, the oxygen partial pressure is 100Pa), the deposition roller maintains its surface temperature at 5°C by forced cooling, a...

Embodiment 2

[0031] According to the ratio, prepare 60 parts by weight of polypropylene, 20 parts by weight of maleic anhydride modified polypropylene, 12 parts by weight of Ni powder and 8 parts by weight of Fe 3 O 4 Put it into a screw extruder, knead at 220°C and make a masterbatch, and then use a film blowing machine to make a film with a thickness of about 100μm as a polymer film matrix. Then in figure 1 In the vacuum deposition system shown, the two main surfaces of the polymer film substrate are coated with silicon oxide film by thermal evaporation. The pressure roller adopts an elastic rubber roller (temperature is 70℃) to apply the polymer film substrate. Extrusion force of 3MPa, and then through corona treatment (O 2 Plasma, the power is 300W, the oxygen partial pressure is 100Pa), the deposition roller maintains its surface temperature at 5°C by forced cooling, and evaporates the silicon oxide powder placed in the crucible (heated to 1000°C) on the surface of the polymer film subst...

Embodiment 3

[0033] According to the ratio, prepare 80 parts by weight of polypropylene, 15 parts by weight of Ni powder and 5 parts by weight of Fe 3 O 4 Put it into a screw extruder, knead at 220°C and make a masterbatch, and then use a film blowing machine to make a film with a thickness of about 100μm as a polymer film matrix. Then in figure 1 In the vacuum deposition system shown, the two main surfaces of the polymer film substrate are coated with silicon oxide film by thermal evaporation. The pressure roller adopts an elastic rubber roller (temperature is 70℃) to apply the polymer film substrate. Extrusion force of 3MPa, and then through corona treatment (O 2 Plasma, the power is 300W, the oxygen partial pressure is 100Pa), the deposition roller maintains its surface temperature at 5-15°C by forced cooling, and evaporates the silicon oxide powder placed in the crucible (heated to 1000°C) on the polymer film A silicon oxide coating film is deposited on the surface of the substrate, and ...

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Abstract

The invention relates to a shielding anti-interference lightproof film, and belongs to the technical field of vacuum coating and conductive polymers. The shielding anti-interference lightproof film comprises a polymer film substrate filled with conductive particles and magnetic particles, at least part of the surface of the polymer film substrate is coated with a silicon oxide coating film, and the magnetic particles are enriched on the outer surface of the polymer film substrate. The shielding anti-interference lightproof film has good flexibility and electromagnetic shielding efficiency, isgood in environmental stability, can effectively isolate the influence of water and oxygen on a film material, and can play a role in electromagnetic shielding for a long time.

Description

Technical field [0001] The present invention relates to the technical field of vacuum coating and conductive polymers. More specifically, the present invention relates to an opaque film for electromagnetic shielding prepared by combining vacuum coating technology. Background technique [0002] With the increasing use of various electrical equipment and electronic application equipment, the electromagnetic energy radiated by electromagnetic waves is increasing at an annual rate of 7 to 14%, and electromagnetic environmental pollution is becoming more and more serious. At the same time, the sensitivity of electronic and electrical equipment to the external electromagnetic environment has increased. Because the signal level is reduced to meet the requirements of high-speed, light-weight and miniaturization, it is prone to malfunction or operation errors caused by external electromagnetic interference (EMI). Image barriers. [0003] In the prior art, a variety of anti-EMI technologies...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0075H05K9/0083
Inventor 王家福
Owner 瑞年新材料(广东)有限公司
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