Electromagnetic shielding material preparation method, electromagnetic shielding material product and electromagnetic shielding key terminal

Abstract

The invention discloses a method for preparing an electromagnetic shielding material, which comprises the following steps: 1) preparing the following components in parts by weight: 70-80 parts by weight of silicon rubber; 20-30 parts by polytetrafluoroethylene; 2-3 parts by weight of nano-scale graphite powder; Curing agent ~ 2; heat stabilizer 1 ~ 2; 2) forming a composite rubber mixture uniformly infiltrated with nano-scale graphite particles in a molten state; 3) injecting the composite rubber mixture in step 2) into the mold cavity of the forming mold, and Completely wrap the wire mesh inside; 4) In a negative pressure environment, vibrate the forming mold through a vibrator to remove the internal air bubbles; 5) High pressure and low temperature, rapid cooling and solidification, to obtain a semi-finished electromagnetic shielding material; 6 ) heat and melt the semi-finished electromagnetic shielding material again, and cool and solidify naturally at high pressure and normal temperature to obtain the electromagnetic shielding material. The invention also discloses the electromagnetic shielding material prepared by the method, the corresponding electromagnetic shielding gasket, and the electromagnetic shielding button terminal using the electromagnetic shielding gasket.

Description

Technical field [0001] The present invention relates to a button terminal, in particular to an electromagnetic shielding button terminal. Background technique [0002] Traditional electromagnetic shielding rubber materials, especially electromagnetic shielding rubber materials such as gaskets and gaskets, have complex preparation processes, high production costs, and unsatisfactory electromagnetic shielding performance. Current electronic products, especially terminal electronic products with buttons, need to use a lot of electromagnetic shielding materials. Therefore, it is necessary to develop a kind of simple production process and good electromagnetic shielding effect, which can be used as gaskets. Electromagnetic shielding rubber products. In addition, the traditional button terminal uses silicone rubber buttons, which are independent of each other. They are installed on the surface of the cover and have many openings, which may cause electromagnetic leakage and reduce the ...

AI Technical Summary

Problems solved by technology

In addition, the traditional button terminals use silicone rubber buttons, and the independent buttons are installed on the surface of the cover with many openings, which can easily cause electromagnetic leakage and reduce the shielding effectiveness.

Because the attenuation of the electromagnetic wave by the hole is related to the wavelength of the interference wave and the size of the hole, the size of the hole should generally be much smaller than the wavelength of the electromagnetic wave. As long as the diameter of the hole is small enough, the required shielding performance can be achieved. Therefore, many button terminals The button will be made very small to minimize electromagnetic leakage, but the size and arrangement of the button should generally conform to people's operating habits. Too small a button is inconvenient to use

Moreover, no matter how small the button is, there is still a gap. I don’t know if there is a gap between the button and the casing, there will be gaps in other places, and the problem of electromagnetic leakage still exists.

Images