High-intensity electromagnetic shielding material for new energy electric vehicle and preparation method thereof

Abstract

The invention relates to a high-intensity electromagnetic shielding material for a new energy electric vehicle and a preparation method thereof. A symmetric multi-layered structure comprises an electromagnetic wave impedance matching layer located on the outermost layer, a wave absorbing layer located on the secondary outer layer and a reflective layer of a three-layer structure located in the middle, wherein the electromagnetic wave impedance matching layer comprises a glass fiber cloth with a layer of magnetic medium wave absorbing filler A modified polymer solution sprayed or brushed on thesurface; the wave absorbing layer comprises a glass fiber cloth with a layer of composite modified polymer solution of a magnetic medium wave absorbing filler A and a conductive wave absorbing fillerB sprayed or brushed on the surface; the reflective layer comprises a c11 layer formed by spraying or brushing a layer of conductive filler C modified polymer solution on the surface of a carbon fiber cloth, a c12 layer formed by spraying or brushing a layer of conductive filler C modified polymer solution on the surface of a carbon fiber felt, and a c13 layer formed by spraying or brushing a layer of conductive filler C modified polymer solution on the surface of the carbon fiber cloth; and the c12 layer is located between the c11 layer and the c13 layer, which solves the defects in the prior art as well as meets the electromagnetic shielding effectiveness and mechanical performance requirements of the material.

Description

technical field [0001] The invention relates to a shielding material for new energy electric vehicles, in particular to a high-strength electromagnetic shielding material for new energy electric vehicles and a preparation method thereof. Background technique [0002] Compared with traditional energy vehicles, new energy pure electric vehicles have limited driving range, greater curb weight, greater electromagnetic radiation, and more complicated working conditions, which shows that new energy pure electric vehicles have higher requirements for electromagnetic shielding and lower weight. more urgent. [0003] The battery, motor, and electronic control core system of new energy pure electric vehicles are the focus of electromagnetic shielding. For the "three electric" system, the electrical parts shell is usually made of metal material die-casting and compression molding, while ensuring the load-bearing requirements of the shell. Meet electromagnetic shielding requirements. ...

AI Technical Summary

Problems solved by technology

However, metal is dense, easy to corrode, easy to oxidize, poor electrical insulation, and has the disadvantages of reflecting electromagnetic waves and causing secondary pollution. Compared with traditional metal materials, polymer-based electromagnetic shielding materials can overcome the above defects, but the polymer matrix has Good electrical insulation, there is a problem with the infinite improvement of electromagnetic shielding effectiveness

At present, the method that can provide better shielding performance and lower cost is the coating type electromagnetic shielding material, but the coating layer is easy to peel off from the base material, the service life of the material is short, and the secondary processing ability is poor; The polymer matrix is ​​filled with modified fillers. The filled polymer-based electromagnetic shielding composite material has light specific gravity, chemical corrosion resistance, and the type and amount of modified fillers can be adjusted according to the requirements of electromagnetic shielding performance. The processing difficulties caused by the addition of fillers and the compatibility problems between various types of fillers will seriously affect the mechanical properties of the material

[0004] CN103722832A discloses an insulating polymer-based electromagnetic shielding material and a preparation method thereof. The insulating polymer-based electromagnetic shielding material with a structure of 5-7 layers is prepared by multiple solution casting, that is, the insulating layer is first prepared by the casting method, and after half Cast the wave-absorbing layer on its surface after drying, cast the reflective layer on the surface after the wave-absorbing layer is half dry, and then use the same method to cast the wave-absorbing layer on the surface of the reflective layer, cast the insulating layer on the surface of the wave-absorbing layer, A large amount of conductive fillers are added to both the absorbing layer and the reflecting layer, the mechanical properties are weak, and the molding time is long, which is not conducive to industrialization

[0005] At the same time, the outermost layer of the structure is a pure resin layer. Although the electrical insulation is good, there is a wave impedance mismatch between the electromagnetic wave entering the insulating layer from the air, and the leakage of the electromagnetic wave causes secondary pollution, and the material is only in the polymer matrix. Adding powdered conductive fillers and additives, in order to meet the electromagnetic shielding effect, the increase of the amount of fillers will affect the mechanical properties and processing properties of the material, which will greatly limit the practical application of the material

[0006] CNCN102514290A discloses a metal fiber-polymer composite electromagnetic shielding material and its preparation method. It adopts a three-layer composite structure in which the upper and lower surfaces are polymer layers and the middle is a metal fiber layer. The density of the metal fibers is high, thereby increasing the specific gravity of the material , it is easy to cause the metal fiber layer to peel off, which affects the mechanical properties and electromagnetic shielding performance of the material

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