A preparation method of a wave absorber, a wave absorber and applications thereof

Abstract

The invention discloses a method for preparing a wave absorbing body. The raw material of the wave absorbing body includes uniformly mixed wave absorbing agent powder and thermoplastic polymer, and the pre-created three-dimensional figure of the wave absorbing body is used as the molding target. The three-dimensional figure of the wave absorbing body It is decomposed into a multi-layer two-dimensional structure with a target thickness; the raw material of the wave absorber is heated and melted by the rapid prototyping equipment, and a magnetic field whose magnetic field lines are parallel to the two-dimensional structure is applied at the same time, so that the thermoplastic polymer melts and absorbs the wave absorber. The powder is bonded and coated, and the bonded and coated wave absorber powder is arranged in parallel under the action of a magnetic field to form a wave absorber with a three-dimensional structure; the embodiment of the invention also discloses a wave absorber and its Application: The preparation process of the present invention is simple, and it is easy to realize large-scale production, and the prepared absorber has a three-dimensional structure, avoiding the splicing structure of the planar absorber, and the thickness is adjustable and the shape is regular and evenly arranged, with excellent Electromagnetic wave shielding function.

Description

Technical field [0001] The present invention belongs to the field of absorbing materials, and more particularly to a method of preparing an absorbing body, the present invention also relates to an absorbing body and its application thereof using the preparation method. Background technique [0002] With the rapid development of electronics, the electromagnetic wave interference problem between various components is getting closer and more serious by high frequency and high integration trends. Since the absorbing material can absorb the electromagnetic wave rather than reflection, it has the advantage that other conductive shield materials cannot be replaced, so in order to reduce electromagnetic wave interference, the absorbing material is increasingly widely used in electronic products. Specifically, in various types of absorbing materials, the soft magnetic alloy has a very wide application in electronic devices due to its characteristics of high magnetic saturation strength, h...

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Problems solved by technology

However, this preparation method and the obtained absorbing coating have the following disadvantages: (1) a large amount of solvent is used in the preparation process; (2) the thickness is limited, usually not greater than 0.5 mm; (3) only a flat surface can be obtained shaped coating

[0004] However, in practical application scenarios, absorbers with greater thickness are sometimes required to achieve better shielding effects. At the same time, the protection of planar absorbing coatings for three-dimensional components needs to be achieved by splicing and pasting. Its seams inevitably increase the risk of leakage

[0005] Moreover, the applicant searched through patents and found that it was proposed to use magnetic field rotation orientation for pretreatment and then press molding to obtain a 3D effect absorber. The process of magnetic field rotation orientation is particularly complicated, and the 3D effect absorber obtained by pressing cannot realize the Arranged in parallel, the electromagnetic wave shielding is limited (see CN104319050A directly); it is also proposed to perform magnetic field orientation during the pressing process, and then cut layer by layer before stacking and forming. This cutting process is very time-consuming and labor-intensive, and it is difficult to realize industrial promotion (directly refer to CN107256751A)

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