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Two-layer or multilayer composite sheet made of porous metal and high polymer material

A technology of polymer materials and porous metals, applied in the field of composite conductive materials, can solve problems such as misjudgment and key switch function failure

Active Publication Date: 2017-02-15
NANTONG MEMTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the contact resistance is too large, it will cause the function of the key switch to fail and misjudgment

Method used

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  • Two-layer or multilayer composite sheet made of porous metal and high polymer material
  • Two-layer or multilayer composite sheet made of porous metal and high polymer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-temperature hot-melt adhesive sheet made of epoxy-modified acrylic resin with a thickness of 0.05mm was placed between two porous metal sheets with a thickness of 0.075mm, and pressed at 280°C to obtain a composite sheet. The porous metal sheet used in this embodiment is a stainless steel sheet with uniformly distributed holes with a diameter of 0.5 mm and a distance between two adjacent holes of 0.25 mm. The axes of these holes are perpendicular to the porous metal sheet. The obtained composite sheet was punched into small discs with a diameter of 5 mm. The material of the two circular surfaces of this small disc is the same, and the contact resistance of the two circular surfaces is also the same. This small disc, as an electrical contact, is compounded with silicone rubber by thermal vulcanization and bonding, so that a silicone rubber button with electrical contact can be made. No matter which circular surface of the small disc is bonded to the silicon rubbe...

Embodiment 2

[0029] The materials used in Example 1 were also used in Example 2. In order to increase the overall mechanical strength of the composite sheet and the electrical contacts made afterwards, a non-porous stainless steel sheet with a thickness of 0.075mm is placed between the two layers of porous stainless steel sheets, the non-porous stainless steel sheet and the porous stainless steel sheet Between them, a composite sheet is still bonded with a high-temperature hot-melt adhesive sheet, and die-cut into small discs with various diameters (such as 2mm, 2.5mm, 5mm, 10mm). This small disc can also be used as an electrical contact in a silicone rubber key.

Embodiment 3

[0031] Dip a 0.05mm thick stainless steel sheet into the silicone rubber solution, and coat a layer of silicone rubber with a dry film thickness of 25-30 μm on both sides of the stainless steel sheet by dip coating. The formula of silicone rubber solution is silicone rubber (in this embodiment, select the product produced by Wacker Company, Germany) R401 / 60) 7.5g, vinyltri-tert-butylperoxysilane (VTPS), 0.1g, xylene 92.4g. Dry the silicone rubber solution dip-coated on the stainless steel sheet at 70°C, then, 40-mesh stainless steel wire mesh, 40-mesh nickel wire mesh, 0.15mm thick stainless steel fiber sintered felt with a porosity of 80%, 0.15mm thick Nickel foam with a porosity of 85%, 0.15mm thick nickel expanded mesh with a hole diameter of 0.5mm and a hole spacing of 0.25mm are laminated on both sides of a stainless steel sheet coated with silicone rubber, and then placed on a flat vulcanizer , Pressed at 165°C for 10 minutes to obtain various composite sheets reinfor...

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Abstract

The invention discloses a two-layer or multilayer composite sheet made of porous metal and a high polymer material, and an electric contact prepared from the compound sheet. The two-layer or multilayer compound sheet is formed by tightly combining a two-layer or multilayer porous metal sheet with the high polymer material, and the thickness is 0.1 to 5mm. Small sheets of which circumscribed circles are 1 to 10mm in diameter, obtained by segmenting or punching the composite sheet can be used as the electric contact of a key. The porous metal disclosed by the invention is a metal net, a metal sintered net, a metal plate net, metal foam, a metal fiber sintered felt and a metal sheet with a plurality of holes which are uniformly distributed or randomly distributed. Material compositions of two surfaces of the produced composite sheet are consistent, and contact resistances of the two surfaces are both low. The two surfaces of the electric contact, prepared from the composite sheet, of the key are equivalently conductive, so that the problem that surface contact resistance of the electric contact is high or the electric contact is nonconductive, which possibly occurs in a production process is solved.

Description

technical field [0001] The invention relates to the field of composite materials, more specifically, the invention relates to composite conductive materials, which are suitable for making electrical contacts of keys. Background technique [0002] Rubber itself is an insulator. Adding conductive carbon black to rubber can prepare antistatic rubber and conductive rubber. Adding metal powder, especially silver powder or silver-plated powder to the rubber base material can make conductive rubber with better conductivity. A small disc made of conductive rubber, often called "conductive particle", is a type of electrical contact. Since the conductive carbon black and metal powder are dispersed in the conductive rubber, the conductive rubber made of conductive carbon black and metal powder as fillers has larger volume resistivity and surface resistivity than common metal conductive materials, and greater conduction The current capacity is not enough in some occasions. In order ...

Claims

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Application Information

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IPC IPC(8): B32B15/01B32B15/18B32B3/08B32B3/30B32B15/02B32B15/14B32B15/04H01H1/021
CPCB32B3/085B32B3/30B32B15/011B32B15/015B32B15/02B32B15/046B32B15/14B32B2255/06B32B2255/205B32B2255/26B32B2260/023B32B2260/048B32B2307/202B32B2457/00H01H1/021
Inventor 张红梅丁阳韩辉升
Owner NANTONG MEMTECH TECH
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