Method for improving conductivity of electroconductive rubber

A conductive rubber and conductive performance technology, applied in the field of conductive materials, can solve the problem of conductive powder or conductive fiber detachment, achieve the effect of reducing volume resistivity and surface resistivity and enhancing conductive performance

Active Publication Date: 2016-05-04
吉安创德精密电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the conductive rubber filled with conductive powder or conductive fiber may have the problem of detachment of conductive powder or conductive fiber from the conductive rubber during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, a porous conductive rubber is prepared by a mechanical method. The smooth square 304 stainless steel wire with a side length of 0.5 mm is straightened and densely distributed in the rubber heat vulcanization mold. The arrangement of the stainless steel wires is: they are arranged in parallel in the X-axis, Y-axis and Z direction, and the distance between the axes of the parallel-arranged stainless steel wires is 0.75 mm. The stainless steel wires in the three-dimensional direction are in contact with each other. In the Y-axis direction (height direction), the stainless steel wire can be replaced by a square metal column with a side length of 0.5mm, and the height of the metal column is the height of the mold cavity.

[0034] Put a conductive silicone rubber compound filled with conductive carbon black (such as KE-3601SB-U, a product of Shin-Etsu Co., Ltd.) into the mold cavity, and vulcanize under pressure at 175°C for 10 minutes to obtain a silicone r...

Embodiment 2

[0037] As embodiment 1, but the time of electroless nickel plating is 30 minutes, then carries out electroplating nickel for 5 minutes. The resulting product also has lower contact resistance.

Embodiment 3

[0039] As in Example 1, a conductive silicone rubber whose conductivity was enhanced by electroless nickel plating was prepared, and a small disc with a diameter of 7.5 mm and a thickness of 1 mm was prepared. The small wafer was subjected to electroless gold plating, and the average thickness of the gold plating layer was 0.1 μm. The gold-plated layer is only deposited on the surface of the nickel in the small disc, and the gold-plated layer will not be deposited on the surface of the silicone rubber. The resulting small disc is used as an electrical contact material, and the number of times the contact resistance is kept below 1Ω under a current of 200mA is at least 20% more than that of the non-gold-plated small disc as an electrical contact material.

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PUM

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Abstract

The invention discloses a method for improving conductivity of electroconductive rubber. According to the method, the inner walls of existing holes in porous type electroconductive rubber are subject to chemical plating or electroplating, or holes are formed in solid electroconductive rubber through a mechanical or physical method, and the inner walls of the holes are subject to chemical plating or electroplating, so that metal plating layers are formed on the inner walls of the holes, and the conductivity of the electroconductive rubber is enhanced. Metal meshes are formed by the metal plating layers in the electroconductive rubber, and conductivity of the electroconductive rubber in all directions can be further enhanced. According to the method, the surface of the electroconductive rubber is in contact with a resistor, the resistance is decreased to below 1 omega from above 100 omega, the conductivity of the electroconductive rubber manufactured through the method is more excellent, and a switch contact material for conducting and breaking the current above 100 mA can be used.

Description

technical field [0001] The invention belongs to the field of conductive materials, and in particular relates to a method for improving the conductivity of the conductive rubber by forming a metal coating or even a metal network in the porous conductive rubber through chemical plating and electroplating. Background technique [0002] Filling conductive carbon materials (such as conductive carbon black, carbon fiber, graphite, carbon nanotubes and graphene) or metal materials (such as metal powder, metal fiber, etc.) into rubber materials is the main method for preparing conductive rubber. However, since the conductive fillers added are dispersed, the volume resistivity and surface resistivity of such conductive rubber are still higher than those of common metal conductive materials, and the ability to conduct large currents is not enough in some occasions. Such conductive rubber, as a switch contact material, can only be used in a circuit with a small current (for example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C25D3/12C23C28/02
CPCC23C18/36C23C28/02C25D3/12
Inventor 韩辉升丁阳陆婷张红梅
Owner 吉安创德精密电子有限公司
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