Conductive foam and fabrication method thereof

Abstract

The invention discloses conductive foam and a fabrication method thereof. The conductive foam comprises an elastic body, a bonding layer and a shielding layer, wherein the bonding layer wraps the outer surface of the elastic body, the elastic body, the bonding layer and the shielding layer are sequentially arranged from inside to outside, the shielding layer is provided with a high-molecular polymer film and a metal layer from inside to outside, and a processing agent layer is arranged between the high-molecular polymer film and the bonding layer and used for improving the surface activity of the high-molecular polymer film. With a mode of additionally arranging the processing agent layer, the surface activity of the high-molecular polymer film is improved, the high-molecular polymer film is more tightly and firmly bonded with the elastic body by the bonding layer, a permeating bonding effect is formed between the bonding layer and the high-molecular polymer film, a tiny gap is eliminated, and the high-molecular polymer film is difficult to pop from the elastic body in a high-temperature environment.

Description

technical field [0001] The invention relates to the technical field of shielding materials, in particular to a conductive foam and a manufacturing method thereof. Background technique [0002] Shielding is the isolation of metal between two spatial regions to control the induction and radiation of electric fields, magnetic fields and electromagnetic waves from one region to another. Specifically, it is to use a shield to surround the interference source of components, circuits, assemblies, cables or the entire system to prevent the interference electromagnetic field from spreading outward; to surround the receiving circuit, equipment or system with a shield to prevent them from being affected by the outside world. The influence of electromagnetic fields. [0003] Commonly used shielding materials include conductive rubber shielding gasket, beryllium copper reed shielding gasket, conductive glue, magnetic field shielding material (commonly known as wave absorbing material), ...

AI Technical Summary

Problems solved by technology

Conductive foam pads are widely used due to their advantages of large compressibility, adaptability to various standard configurations, punching into different shapes, and low price. The conductive cloth of the melt adhesive is wrapped with foam and other fillers. Due to the characteristics of the hot melt adhesive and the material itself, it does not have the characteristics of high temperature resistance and tinning, so it cannot be assembled automatically. It needs to be pasted manually during use. , manual work will cause poor adhesion and poor viscosity after the adhesive is placed for a long time, which will affect the product's sticking effect. , restricting its development

The existing production plan of wrapping the silicone elastomer with a shielding layer, due to factors such as the hardness of the silicone itself, makes its production efficiency low and small-sized products cannot be produced.

Moreover, the metal shielding layer on the outside of the existing conductive foam is not viscous enough to be bonded to the elastomer inside, and it is easy to loosen and produce gaps under high temperature conditions, which affects the shielding effect of the foam. Some foam products even There will be situations where the shielding layer bursts from the elastic body, seriously affecting the use

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