Transparent electromagnetic shielding film

Abstract

A transparent electromagnetic shielding film comprises a base material layer, a lower protective layer, a metal functional layer, an upper protective layer for preventing oxidation and a sealing cover layer for retaining water and isolating air, wherein the lower protective layer is titanium oxide, zinc oxide, nickel-chromium alloy, silicon dioxide, niobium pentoxide, aluminum oxide, magnesium oxide-doped zinc oxide or an aluminum oxide-doped zinc oxide layer, the metal functional layer is a copper, silver, titanium, gold, aluminum, rhenium, palladium, ruthenium, rhodium, platinum, iridium or osmium layer or an alloy layer of the above metals, and the upper protective layer is a silicon dioxide, zinc oxide, nickel, chromium, nickel-chromium alloy, aluminum oxide-doped zinc oxide or silicon oxide-doped aluminum layer. Through film layer structure matching, the shielding film has good salt mist resistance and environmental measurement resistance, also has excellent optical performance, high light transmittance and a better laser die cutting effect, is convenient for laser large-scale cutting and processing, and can be used for manufacturing fine parts; the shielding film has a nano-level size and is thinner and lighter; the film layer is compact and has no pinhole points; the sheet resistance uniformity is good; the adhesive force of the film layer is good; and good gluing is realized.

Description

technical field [0001] The invention relates to a transparent electromagnetic shielding film. Background technique [0002] In recent years, with the continuous development of communication products (mobile phones), computers (notebooks), portable electronic products, consumer electronics, network hardware (servers, etc.), medical instruments, household electronic products, and aerospace and defense electronic equipment, among them More and more attention has been paid to the EMI problem. [0003] In the prior art, in response to EMI, there are evaporation coatings, chemical coatings, conductive paints, etc. to achieve shielding functions. However, these processes are time-consuming, thick materials, high processing costs, and pollute the environment, as shown in the patent announcement number CN204206720 A nanoscale metal electromagnetic shielding film, comprising a three-layer structure of a carrier layer, a first shielding layer and an insulating layer, the first shieldi...

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Problems solved by technology

[0003] In the prior art, in response to EMI, there are evaporation coatings, chemical coatings, conductive paints, etc. to achieve shielding functions. However, these processes are time-consuming, thick materials, high processing costs, and pollute the environment, as shown in the patent announcement number CN204206720 A nanoscale metal electromagnetic shielding film, comprising a three-layer structure of a carrier layer, a first shielding layer and an insulating layer, the first shielding layer is a conductive ink layer or a magnetron sputtering coating, and the carrier layer, the first shielding layer and the insulating layer are composed of Stacked in sequence from bottom to top, the surface of the carrier layer is covered with the first shielding layer, and the surface of the first shielding layer is covered with an insulating layer

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