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Conductive rubber and application thereof

A technology of conductive rubber and rubber, which is applied in the direction of circuits, conductive materials dispersed in non-conductive inorganic materials, electric switches, etc., can solve the problems of inconvenient processing and molding, unfavorable bonding, small specific surface area, etc. Dust resistance, easy adjustment, simple production method

Active Publication Date: 2011-09-07
DONGGUAN MEMTECH ELECTRONICS MEMTECH ELECTRONICS PRO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether metal sponge, metal foam or metal mesh is used, its specific surface area is small, which is not conducive to bonding with rubber materials, the thickness of the metal layer is difficult to adjust, processing and molding is inconvenient, and the overall electrical conductivity needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Use solid silicone rubber KE-950 with a Shore A hardness of 50, add 1% cross-linking agent DCP, and mix it on a two-roller open rubber mixer at room temperature for 10 minutes to produce a 2mm rubber sheet. Standby; take a metal fiber sintered mat made of stainless steel (SUS316L) fibers with a thickness of 0.30mm, a square side length of 12.0cm, and a porosity of 88% by vacuum sintering with a metal fiber diameter of 0.8 microns. The fiber sintered mat is placed in a square cavity with a side length of 12.2 cm. The depth of the square cavity is 0.60mm. Put a 10-gram compound rubber sheet on the stainless steel non-woven fabric, heat vulcanization molding at 165 ° C for 10 minutes, release the mold, and take out the rubber sheet containing the stainless steel non-woven fabric from the mold cavity, which is the metal non-woven fabric. Cloth rubber composite sheet. This sheet was punched into small discs with a diameter of 3.0 mm. This small disc can be used in the key...

Embodiment 2

[0027] The metal fiber sintered felt used in this example is treated with 2% ethanol solution of silane coupling agent KH-550 (dipped or painted), baked at 90°C for 15 minutes, and then placed in a desiccator spare. Other processing is identical with embodiment one.

Embodiment 3

[0029] Take a metal fiber sintered mat made of stainless steel (SUS316L) fibers with a thickness of 0.30mm, a square side length of 12.0cm, and a porosity of 80%, and a metal fiber diameter of 0.8 microns. In a square mold cavity with a side length of 12.2 cm. The depth of the square cavity is 0.30mm. Put a 10-gram freshly mixed liquid silicone rubber (Silopren? LSR2660) on the stainless steel metal fiber sintered felt, heat vulcanization molding at 120°C for 20 minutes, and release the mold. The stainless steel metal fiber sintered felt is contained in the mold cavity. The rubber sheet is a rubber composite sheet containing metal non-woven fabric.

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PUM

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Abstract

The invention relates to a conductive rubber and an application thereof. The conductive rubber is manufactured by the composite of rubber and metal fiber sintered felt in a mould pressing or injection mode; the metal fiber sintered felt is provided with pores which are at least filled with rubber. According to the invention, the metal fiber sintered felt is adopted to replace the traditional metal sponge, metal foam or metal nets to be composited with the rubber, the manufacturing molding is convenient, and the integral conductive performance can be improved; and the conductive rubber can be punched into small round grains, the conductive rubber is used in buttons of a conduction switch of a circuit board as a conductive contact element.

Description

technical field [0001] The invention relates to conductive rubber and its application in the manufacture of conductive contact elements for circuit board conduction switches (such as mobile phone buttons, car buttons, etc.). Background technique [0002] Rubber is inherently a good electrical insulator. In order to obtain conductive properties of rubber materials, conductive fillers such as conductive carbon black, carbon fiber, metal powder, metal short fibers and other particle or fiber fillers are usually added during processing to form composite conductive polymer materials. In order to obtain good electrical conductivity, a sufficient amount of conductive filler must be added so that in the conductive rubber, the distance between the conductive filler particles is small enough to form a conductive path. However, this filled conductive rubber should not be used as a contact element of a high-current conduction switch because the conductive particles are not a physically...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01H1/029
Inventor 韩辉升管建华张劲松刘小平顾建祥
Owner DONGGUAN MEMTECH ELECTRONICS MEMTECH ELECTRONICS PRO
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