Multilayer electromagnetic shielding film and preparation method thereof

An electromagnetic shielding film and shielding layer technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of time-consuming and labor-intensive, high cost, unsatisfactory shielding effect, etc. And the effect of good toughness, excellent electromagnetic shielding performance and simple production process

Active Publication Date: 2019-02-22
BEIJING YUANLIU HONGYUAN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing electromagnetic shielding film has a single structure and the shielding effect is not ideal. In order to achieve excellent electromagnetic shielding performance, it is often developed to a multi-layer structure. However, the multi-layer structure is only in the laboratory research stage and cannot be mass-produced continuously. The production process Time-consuming and labor-intensive, high cost

Method used

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  • Multilayer electromagnetic shielding film and preparation method thereof
  • Multilayer electromagnetic shielding film and preparation method thereof
  • Multilayer electromagnetic shielding film and preparation method thereof

Examples

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Effect test

preparation example Construction

[0042] Step 5, completing the preparation of the five-layer electromagnetic shielding film.

[0043] The invention can prepare the electromagnetic shielding film on a large scale through the above method, and the prepared electromagnetic shielding film has excellent electromagnetic shielding performance, good mechanical strength and toughness.

Embodiment 1

[0045]The polyvinyl butyral (PVB) resin powder is prepared according to the ratio of the solid content of the resin powder to 0.05g / ml, the volume ratio of toluene:ethanol=5:1, and the plasticizer content of 1wt%. , mechanically stirred for 8 hours to reach the complete dissolution of the resin powder; in the PVB resin solution, the silver powder content was respectively: 5wt%, 10wt%, 30wt%, 60wt% to configure the slurry solution, and continue to stir to make the filler particles (silver powder) in the solution Stir for 5 hours to fully mix, perform defoaming treatment before casting, carry out distributed casting according to the design structure sequence, adjust the width of the knife edge gap of the machine head, the discharge pressure of the slurry tank, the winding speed of the PET film tape, and the slurry in the slurry The material tank is pumped into the knife-edge mold through the plastic tube, and the slurry is sprayed to the opposite PET film tape through the narrow ...

Embodiment 2

[0047] The polyvinyl butyral (PVB) resin powder is prepared according to the ratio of resin powder solid content of 0.25g / ml, toluene:ethanol volume ratio=3:1, and plasticizer content of 2wt% in the reactor. , mechanical stirring reached the complete dissolving of resin powder in 8 hours; In PVB resin solution, by nickel powder content, be respectively: 10wt%, 20wt%, 40wt%, 80wt% carry out configuration slurry solution, continue to stir and make filler particle (nickel powder) in Stir in the solution for 5 hours to fully mix, perform defoaming treatment before casting, carry out distributed casting according to the sequence of the design structure, adjust the width of the knife edge gap of the machine head, the discharge pressure of the slurry tank, the winding speed of the PET film, and the slurry In the slurry tank, it is drawn into the knife-edge mold through the plastic tube, and the slurry is sprayed to the opposite PET film tape through the narrow slit of the knife edge u...

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Abstract

The invention discloses a multilayer electromagnetic shielding film and a preparation method thereof. According to the multilayer electromagnetic shielding film, shielding layers are arranged from the outermost layer to the sub-bottom layer and the bottom layer is a resin insulating layer; the resin insulating layer is a pure resin layer; each of the shielding layers is of a layered structure formed by adding conductive filler to matrix resin. The conductive filler comprises one or more of nickel powder, silver powder, a carbon nanotube and graphene. In two adjacent shielding layers, The adding amount of the conductive filler of the lower shielding layer is greater than that of the lower shielding layer. The electromagnetic shielding property of the multilayer electromagnetic shielding film prepared by the invention is excellent, and the mechanical strength and toughness are good; meanwhile, the production process is simple, the cost is low, and full continuous scaled production can be achieved.

Description

technical field [0001] The invention relates to an electromagnetic shielding film, in particular to an electromagnetic shielding film with a multilayer structure, and a multilayer electromagnetic shielding film prepared by continuous multiple flow casting with a flow casting machine. Background technique [0002] Electromagnetic shielding film is mainly a film made of conductive materials to suppress electromagnetic interference. The existing electromagnetic shielding film has a single structure and the shielding effect is not ideal. In order to achieve excellent electromagnetic shielding performance, it is often developed to a multi-layer structure. However, the multi-layer structure is only in the laboratory research stage and cannot be mass-produced continuously. The production process Time-consuming and labor-intensive, the cost is higher. Based on this situation, there is an urgent need for a simple method that can be scaled up to prepare a multilayer electromagnetic s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/42B32B27/20
CPCB32B27/08B32B27/20B32B27/42
Inventor 段磊
Owner BEIJING YUANLIU HONGYUAN ELECTRONICS TECH
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