Composite conductive sponge and preparation method thereof

Abstract

The invention discloses composite conductive sponge and a preparation method thereof. The composite conductive sponge comprises bare sponge and bare cloth. The preparation method comprises the following steps: firstly adhering the bare sponge and the bare cloth into whole sponge cloth in a gluing compositing or fire compositing way, plating the sponge cloth with a nickel layer or copper layer, electroplating the surface of the sponge cloth substrate, which is plated with the nickel layer or the copper layer, with a nickel layer directly or with a copper layer first and then a nickel layer, washing by using water, and drying to obtain the composite conductive sponge. The composite conductive sponge has the advantages as follows: in the whole sponge cloth, a conductive glue layer is not required to be arranged, so that the use of conductive glue can be completely avoided, and risks of product accidents caused by glue failure are completely avoided; the product resistance is not interfered by the glue layer any longer; the process flow is short; the stability of the product quality is improved.

Description

technical field [0001] The invention relates to the field of conductive materials, in particular to a composite conductive sponge and a preparation method thereof. Background technique [0002] Composite conductive sponge is a three-dimensional network structure functional material that integrates conduction and electromagnetic shielding functions. It is widely used in conductive materials due to its long conductive period, good electromagnetic shielding effect, and surface resistance values ​​that can be set according to actual uses. field. At present, the composite conductive sponges on the market are generally made of conductive sponge products and conductive cloth products. Its structure is composed of conductive sponge products, conductive adhesive layers and conductive cloth products. It is prepared separately by the manufacturer, and the composite conductive sponge needs to firmly combine these two different materials, so the conductive adhesive layer is formed by us...

AI Technical Summary

Problems solved by technology

At present, the composite conductive sponges on the market are generally made of conductive sponge products and conductive cloth products. Its structure is composed of conductive sponge products, conductive adhesive layers and conductive cloth products. It is prepared separately by the manufacturer, and the composite conductive sponge needs to firmly combine these two different materials, so the conductive adhesive layer is formed by using conductive adhesive or hot melt adhesive as the composite intermediate layer combining the two. However, the conductive adhesive layer It is not environmentally friendly, and the conductive adhesive or hot melt adhesive may fail under high temperature or long-term use, which will lead to unstable quality of the composite conductive sponge

Secondly, during the use of the composite conductive sponge coated with a conductive adhesive layer, its product resistance will be interfered by the glue, and the resistance value is too high or even difficult to meet the international standard (≦0.1Ω), and the resistance value is generally 0.08-1.5 Wide interval fluctuation of Ω

In addition, during the preparation process of the existing composite conductive sponge, the finished conductive sponge and the finished conductive cloth need to be prepared separately. The preparation process of the finished conductive sponge includes pretreatment of the bare sponge for conduction, nickel plating, etc.; the preparation process of the finished conductive cloth includes the bare cloth Conductive pretreatment, nickel electroplating, etc.; and then thermally press and compound the finished conductive sponge and conductive cloth finished products respectively for 3-5 times. The entire process is too long, resulting in high product costs

Moreover, under different process environments, even the finished conductive sponge and conductive cloth products produced by different manufacturers have certain deviations in quality. The two are used as raw materials for later processing of composite conductive sponge, which is not conducive to the stability of product quality.

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