Novel polymer-based electromagnetic shielding film or sheet and preparation method thereof

An electromagnetic shielding and polymer technology, applied in the field of polymer-based functional materials and their preparation, can solve the problems of difficult design of morphological structure, low production efficiency, poor shielding effect, etc., and achieves less filler usage, low production cost, and improved effect. Effect

Inactive Publication Date: 2012-07-11
SICHUAN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new type of polymer-based electromagnetic shielding material and its preparation method in view of the current situation of preparing polymer-based electromagnetic shielding materials, so as to solve the problem of poor shielding effect of polymer-based electromagnetic shielding materials prepared in the prior art. Difficult structure design, low production efficiency, poor mechanical properties and other technical problems

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  • Novel polymer-based electromagnetic shielding film or sheet and preparation method thereof

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Embodiment 1

[0027] The raw materials are polypropylene and graphite, the aspect ratio of graphite is 10, the insulating layer and conductive layer are pure polypropylene and graphite-filled polypropylene respectively, and the resistivity ratio of insulating layer and conductive layer is 2×10 5 . First, ordinary graphite-filled polypropylene is prepared, and the graphite content is 5%. After the polypropylene and graphite are dried, they are melt-mixed and granulated in a twin-screw extruder. Electromagnetic shielding layer and insulating layer pellets are respectively put into two extruders of the micro-layer co-extrusion device. The extruder speed ratio is 1:1. , The temperature of the layer multiplier and the outlet die is about 200°C. Using three layer multipliers, the melt flows out of the outlet die under the traction of the traction device. After being cooled by the cooling device, the thickness is 2mm and the number of layers is prepared. 16-layer polypropylene based electromagnet...

Embodiment 2

[0029] The raw materials are polypropylene and graphite, the aspect ratio of graphite is 50, the insulating layer and conductive layer are pure polypropylene and graphite-filled polypropylene respectively, and the resistivity ratio of insulating layer and conductive layer is 6×10 6 . Firstly, ordinary graphite-filled polypropylene is prepared, and the graphite content is 10%. After drying the polypropylene and graphite, they are melt-mixed and granulated in a twin-screw extruder. The conductive layer and insulating layer pellets are put into the two extruders of the micro-layer co-extrusion device respectively. The extruder speed ratio is 1:2. The temperature of the layer multiplier and the exit die are both about 200°C. Using one layer multiplier, the melt flows out of the exit die under the traction of the traction device. After being cooled by the cooling device, the thickness is 0.2mm and the number of layers is prepared. 4-layer polypropylene based electromagnetic shield...

Embodiment 3

[0031] The raw materials are polystyrene and nickel sheet, the aspect ratio of nickel sheet is 18, the insulating layer and conductive layer are pure polystyrene and nickel sheet filled polystyrene respectively, and the resistivity ratio of insulating layer and conductive layer is 8×10 6 . Firstly, ordinary polystyrene filled with nickel flakes is prepared, and the content of nickel flakes is 30%. After the polystyrene and nickel flakes are dried, they are melt-mixed and granulated in a twin-screw extruder. The conductive layer and insulating layer pellets are put into the two extruders of the micro-layer co-extrusion device respectively. The extruder speed ratio is 1:1. The temperature of each section of the extruder is controlled between 170-200 °C. The temperature of the layer multiplier and the exit die are both about 200°C. Using 5 layer multipliers, the melt flows out of the exit die under the traction of the traction device. After being cooled by the cooling device, the...

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Abstract

The invention discloses a novel polymer-based electromagnetic shielding film or sheet and a preparation method thereof. The electromagnetic shielding material is formed by arranging insulating layers and conductive layers in an alternate lamination mode, wherein the insulating layers are made of polymer resin; the conductive layers are made of two-dimensional conductive substance filled polymer resin; and the insulating layers and the conductive layers have a high electrical resistance rate. A large number of laminated interfaces exist in the material, are oriented by two-dimensional platy conductive substances and are parallelly arranged. The preparation method comprises the following steps of: putting materials of the insulating layers and the conductive layers into two extruding machines of a micro-laminated co-extrusion device respectively for fusion plasticization; superposing two melts to form two layers of melts at a convergence device; and cutting and superposing by using n layer multipliers to obtain 2(n+1) layers of electromagnetic shielding materials. According to the film or sheet and the preparation method, the layer number of the electromagnetic shielding materials and the ratio of the thickness of each conductive layer to the thickness of each insulating layer are determined by the number of the layer multipliers and the rotation speed ratio of the extruding machines respectively; the film or the sheet has designable structures and properties; and compared with an electromagnetic shielding material prepared by the conventional method, the electromagnetic shield material has a high electromagnetic shielding effect and a high breaking elongation rate. The equipment provided by the invention is simple and readily-available, required materials are commercially available, other chemicals are not required to be synthesized, and the equipment is easy to operate and has low production cost and high efficiency.

Description

technical field [0001] The invention relates to the technical field of polymer-based functional materials and their preparation. More specifically, the invention relates to a polymer-based electromagnetic shielding film or sheet and a preparation method thereof. The electromagnetic shielding material has good electromagnetic shielding effect and mechanical properties. performance. Background technique [0002] Electromagnetic shielding material is a kind of material that prevents the propagation and diffusion of electromagnetic waves by reducing, intercepting or blocking electromagnetic radiation energy, so that it is confined in a specified space. Electromagnetic radiation has become another serious pollution after air pollution and water pollution. The use of shielding materials is a simple and effective way to suppress electromagnetic radiation. Traditional shielding materials usually use standard metals and their composite materials. They lack machinability, are expensi...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/18B29B9/06B29C47/06B29L7/00
Inventor 李姜郭少云喻琴
Owner SICHUAN UNIV
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