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
  • Claims
  • Application Information

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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,

Method used

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

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Example Embodiment

[0026] Example 1

[0027] The raw materials are polypropylene and graphite, the length-to-thickness ratio of graphite is 10, the insulating layer and the conductive layer are pure polypropylene and graphite-filled polypropylene, respectively, and the resistivity ratio of the insulating layer and the conductive layer is 2×10 5 . Firstly, ordinary graphite-filled polypropylene is prepared, and the graphite content is 5%. After the polypropylene and graphite are dried, they are melted, mixed and granulated in a twin-screw extruder. The electromagnetic shielding layer and the insulating layer pellets are separately put into the two extruders of the micro-layer co-extrusion device. The speed ratio of the extruder is 1:1, and the temperature of each section of the extruder is controlled between 170-200℃. The temperature of the layer multiplier and the exit mold are both about 200℃, using three layer multipliers, the melt flows out of the exit mold under the traction of the traction de...

Example Embodiment

[0028] Example 2

[0029] The raw materials are polypropylene and graphite. The length-to-thickness ratio of graphite is 50. The insulating layer and the conductive layer are pure polypropylene and graphite-filled polypropylene, respectively. The resistivity ratio of the insulating layer and the conductive layer is 6×10 6 . First, prepare ordinary graphite-filled polypropylene with a graphite content of 10%: After drying the polypropylene and graphite, they are melt-mixed and granulated in a twin-screw extruder. The conductive layer and the insulating layer pellets are separately put into the two extruders of the micro-layer co-extrusion device. The speed ratio of the extruder is 1:2, and the temperature of each section of the extruder is controlled between 170-200℃. The temperature of the layer multiplier and the exit mold are both about 200℃. Using a layer multiplier, the melt flows out of the exit mold under the traction of the traction device. After cooling by the cooling de...

Example Embodiment

[0030] Example 3

[0031] The raw materials are polystyrene and nickel flakes, the length-thickness ratio of the nickel flakes is 18, the insulating layer and the conductive layer are pure polystyrene and nickel flakes filled polystyrene respectively, and the resistivity ratio of the insulating layer and the conductive layer is 8×10 6 . First, prepare ordinary nickel flakes filled with polystyrene, and the content of nickel flakes is 30%: after drying the polystyrene and nickel flakes, they are melted, mixed and pelletized in a twin-screw extruder. The conductive layer and the insulating layer pellets are separately put into the two extruders of the micro-layer co-extrusion device. The speed ratio of the extruder is 1:1, and the temperature of each section of the extruder is controlled between 170-200℃. The temperature of the layer multiplier and the exit mold are both about 200℃, using 5 layer multipliers, the melt flows out from the exit mold under the traction of the traction...

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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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