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Novel multifunctional macromolecule based multilayer electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material, polymer-based technology, applied in the fields of magnetic field/electric field shielding, layered products, chemical instruments and methods, etc., can solve the problems of single function, poor shielding effect, difficult to design morphological structure, etc., and achieve a simple preparation method. , High production efficiency, the effect of improving electrical conductivity

Active Publication Date: 2017-02-15
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of a novel multifunctional polymer-based multilayer electromagnetic shielding material for the preparation status quo of polymer-based electromagnetic shielding materials filled with conductive particles, that is, the polymer-based conductive functional layer and the polymer-based Multi-layer shielding materials with alternately arranged composite functional layers to solve the problems of poor shielding effect, difficult design of shape and structure, and single function of existing electromagnetic shielding materials

Method used

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  • Novel multifunctional macromolecule based multilayer electromagnetic shielding material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] (1) The raw material is thermoplastic polyurethane (TPU) (58A, BASF), carbon nanotube (CNT), intumescent flame retardant (IFR), the conductive functional layer is carbon nanotube filled thermoplastic polyurethane, and the composite functional layer is carbon nanotube Composite filled thermoplastic polyurethane with intumescent flame retardant. The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use. First prepare the conductive functional layer and composite functional layer masterbatch, melt and mix the dried TPU and CNT in a twin-screw extruder at a temperature of 185°C, and prepare a TPU / CNT composite masterbatch containing 6wt% CNT ;The dried TPU, CNT, and IFR were melted, mixed and granulated in a twin-screw extruder at a temperature of 185°C to prepare a TPU / CNT / IFR composite masterbatch containing 1wt%CNT and 30wt%IFR;

[0030] (2) Put the conductive functional layer and composite functional layer masterbatch into the two ex...

Embodiment 2

[0034] (1) The raw materials are polypropylene (PP), carbon black (CB), and nano-montmorillonite (MMT), the conductive functional layer is carbon black-filled polypropylene, and the composite functional layer is composite-filled polypropylene with carbon black and nano-montmorillonite . The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use. First prepare the conductive functional layer and composite functional layer masterbatch, melt and mix the dried PP and CB in a twin-screw extruder at a temperature of 200°C to prepare a PP / CB composite masterbatch containing 15wt% CB ;The dried PP, CB, and MMT were melt-mixed and granulated in a twin-screw extruder at a temperature of 200°C to prepare a PP / CB / MMT composite masterbatch containing 15wt%CB and 20wt%MMT;

[0035] (2) Put the conductive functional layer and composite functional layer masterbatch into the two extruders (A, B) of the multi-layer extrusion system respectively (see figure 1...

Embodiment 3

[0039] (1) The raw materials are polyethylene (PE), graphene (Gr), intumescent flame retardant (IFR), the conductive functional layer is graphene-filled polyethylene, and the composite functional layer is composite filled with graphene and intumescent flame retardant polyethylene. The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use. First prepare the conductive functional layer and composite functional layer masterbatch, melt and mix the dried PE and Gr in a twin-screw extruder at a temperature of 200°C to prepare a PE / Gr composite masterbatch containing 4wt%Gr ; The dried PE, Gr, and IFR were melt-mixed and granulated in a twin-screw extruder at a temperature of 200°C to prepare a PE / Gr / IFR composite masterbatch containing 4wt%Gr and 20wt%IFR;

[0040] (2) Put the conductive functional layer and composite functional layer masterbatch into the two extruders (A, B) of the multi-layer extrusion system respectively (see figure 1 ), adju...

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Abstract

The invention discloses a novel multifunctional macromolecule based multilayer electromagnetic shielding material and a preparation method thereof. The material prepared by the method is composed of a conductive function layer and a composite function layer and is subjected to melt extrusion of a multilayer extrusion system to form a multilayer structure with two alternately arranged phases. The conductive function layer is a macromolecule based conductive composite material filled with conducting particles; the composite function layer is a macromolecule based conductive composite material filled with composite function particles; and the composite function particles are formed by mixing the conductive particles and other function particles. A plenty of laminar interfaces exist in the material, and conductivity exists in the direction which is parallel with the laminar interfaces and the direction which is vertical to the laminar interfaces. The alternate multilayer material prepared by the provided preparation method is controllable in layer number, layer thickness, layer structure and performance; the formula of the raw materials is adjustable; the electromagnetic shielding performance and other composite functions are excellent; the needed raw materials are commercially available and low in cost; and the preparation method is simple, the production efficiency is high, and the continuous batch production can be realized.

Description

technical field [0001] The invention belongs to the field of preparation technology of polymer-based functional composite materials, and in particular relates to a novel multifunctional polymer-based multilayer electromagnetic shielding material and a preparation method thereof. Background technique [0002] With the development of modern technology represented by microelectronic equipment and wireless transmission, electromagnetic waves have gradually become an "invisible killer" that cannot be ignored, affecting human health, information security, and equipment stability while providing convenience for human production and life. Electromagnetic radiation has become another serious pollution after air pollution and water pollution. Using shielding materials is a simple and effective way to suppress electromagnetic radiation. Compared with metal materials, polymer-based electromagnetic shielding materials filled with conductive particles have been gradually used in the fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B32B27/20B32B27/08
CPCB32B27/08B32B27/20B32B2250/24B32B2262/106B32B2264/105B32B2264/108B32B2307/212H05K9/0088
Inventor 沈佳斌陈大勇郭少云
Owner SICHUAN UNIV
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