KR200405787Y1 - Polymer PTC thermister and metal foil for electrode of polymer PTC thermistor - Google Patents

Abstract

The polymer PTC device is composed of a conductive polymer polymer, a metal foil electrode, and a lead (plate or wire terminal). In order to improve adhesion between the conductive polymer polymer and the conductive polymer polymer, the present invention includes a metal foil coated with a silane coupling agent and a silane coupling agent. A polymer PTC device using a metal foil as an electrode is provided.

PTC, metal foil, electrolytic copper foil, rolled copper foil, electrolytic nickel foil, silane coupling agent

Description

Polymer PTC thermister and metal foil for electrode of polymer PTC thermistor}

1 is a structure of a polymer PTC device.

Figure 2 is a cross-sectional structure of the metal foil for electrodes produced by the prior art.

3 is a cross-sectional view of a metal foil coated with a silane coupling agent.

The polymer PTC device is a circuit protection device which cuts off the overcurrent of an electric / electronic circuit produced by using a conductive polymer having a positive temperature coefficient.

The polymer PTC device has a structure as shown in FIG. 1, 101 is a conductive polymer sheet processed and sheeted, 102 is a metal foil electrode, and 103 is a lead.

Among the components of the polymer PTC device, the conductive polymer polymer is mixed with polyolefin resin, various additives, and carbon black to produce a sheet at a temperature of 100 to 250 ° C. The metal foil is nickel plated electrolytic copper foil, nickel plated rolled copper foil, and electrolytic nickel foil. This is used, the lead is nickel plated electrolytic copper foil, nickel plated rolled copper foil, electrolytic nickel foil, nickel plated copper wire and nickel wire and the like using a plate or wire form.

The present invention relates to a polymer PTC element and a metal foil used as an electrode, and the metal foil for a conventional polymer PTC element electrode is disclosed in US Patent Nos. 4,689,475, US Patent No. 4,800,253, International Application Publication WO / 95/34081 and Utility 200323075. The nickel-plated electrolytic copper foil has been commercialized and used as a metal foil for electrodes.

2 shows a cross-sectional structure of a metal foil for electrodes produced in the prior art. Figure 2 shows a metal foil manufactured using an electrolytic copper foil as a base material, 201 of Figure 2 is a base material layer, 202 is a nickel plated layer as an intermediate layer, 203 is a nickel plated layer as a noodle layer, 204 is a nickel plated layer as a protective layer. In addition, the metal foil, as shown in Figure 2, is composed of a shiny surface (Shiny) surface and the concave-convex matte surface, when the bonding with the conductive polymer polymer, the mat surface and the bonding is made.

In the prior art, as shown in FIG. 2, the metal foil having the matt surface of the nickel plated layer exhibits excellent characteristics of suppressing copper corrosion and reaction through nickel plating. However, due to the low reactivity of nickel, the metal foil is laminated with the conductive polymer polymer. At the time of joining, the adhesive force depends on the anchoring effect by the noodle layer on the metal foil mat surface. Therefore, when laminating with the conductive polymer polymer, there is a limit in the adhesive strength, and thus there is a problem that the adhesive strength and electrical conductivity properties due to thermal shock deteriorates when repeated use.

The present invention aims to provide a metal PTC coated with a silane coupling agent and a polymer PTC device using the metal foil as an electrode in order to improve the adhesion between the conductive polymer polymer and the metal foil in the polymer PTC device.

The present invention is to solve the problems of the prior art, by applying a silane coupling agent on the surface of the metal foil, using a metal foil and the metal foil that can maintain the adhesive force to the thermal shock that may occur during the production and use of the polymer PTC device as an electrode A polymer PTC device is provided.

Silane coupling agents are organosilicon compounds that provide a variety of functions. In particular, it has the property of improving the adhesion between the inorganic surface and the organic surface by modifying the inorganic surface.

  Korean Patent Laid-Open Publication No. 03-0033449 discloses 3-aminopropyltriethoxysilane and vinyltriethoxysilane to increase the adhesion between an epoxy resin-impregnated insulating substrate and an electrolytic copper foil in a printed circuit board. It was presented a method of surface treatment by mixing the coating.

However, in the case of the polymer PTC device, since the conductive polymer polymer has a low reactivity polyolefin-based resin as a basic composition, and the adhesive surface of the metal foil is made of a nickel layer having low reactivity, the adhesive force is improved when the above method is used. Can not expect the effect of.

The present invention improves the adhesion between the metal foil and the conductive polymer, to provide a metal foil coated with vinyl trimethoxysilane (Vinyltrimethoxysilane) excellent in reactivity with a polyolefin resin such as polyethylene. Since the silane coupling agent has no reactivity with carbon, the adhesion can be improved without affecting the electrical conductivity.

The silane coupling agent is mixed with pure water in a weight ratio of 0.1 to 10% and used as an aqueous solution.The silane coupling agent aqueous solution is used alone or in an aqueous solution of the silane coupling agent, and a conductive material, especially carbon black powder, is dispersed in the aqueous solution to the surface of the metal foil. Dry after application.

3 shows a cross section of a metal foil coated with a silane coupling agent. 3, 301 shows a metal foil base material layer, 302 shows a nickel plated layer, and 303 shows a silane coupling agent coating layer.

The Example of the silane coupling agent aqueous solution for apply | coating a silane coupling agent by this invention is demonstrated.

Example 1

Vinyltrimethoxysilane (Vinyltrimethoxysilane) is mixed with pure water in a weight ratio of 0.1 to 10% to adjust the pH while stirring for 30 minutes or more. It is important to adjust the pH to a region where the silane coupling agent is stable. The pH is suitably between 3.5 and 6.5, which is slightly acidic.

Example 2

0.1 to 10% by weight of vinyltrimethoxysilane and 0.1 to 10% by weight of N- (2-aminoethyl) -3-aminopropyltrimethoxysilane (N- (20Aminoethyl) -3-aminopropyltrimethoxysilane) After mixing with pure water for 30 minutes or more, use.

Example 3

After mixing vinyltrimethoxysilane with pure water at a weight ratio of 0.1 to 10% and stirring for 30 minutes or more, the pH is adjusted while mixing carbon black at a weight ratio of 0.1 to 1% and stirring for 30 minutes to disperse carbon black in an aqueous solution. Let's do it. The pH is suitably between 3.5 and 6.5, which is slightly acidic, and the stirring is continued during the coating process so that carbon black does not precipitate.

Example 4

0.1 to 10% by weight of vinyltrimethoxysilane and 0.1 to 10% by weight of N- (2-aminoethyl) -3-aminopropyltrimethoxysilane (N- (20Aminoethyl) -3-aminopropyltrimethoxysilane) After mixing with pure water and stirring for 30 minutes or more, the carbon black is mixed in a weight ratio of 0.1 to 1 %% and stirred for 30 minutes to disperse the carbon black in an aqueous solution. Continue stirring during the application process to prevent carbon black from settling

The polymer PTC device produced using the metal foil provided by the present invention improves the adhesive strength by about 5 to 20% compared to the polymer PTC device produced using the nickel plated metal foil. However, the adhesive strength is somewhat different depending on the shape of the noodle of the nickel plated layer.

In particular, when the size of the noodle is large in order to increase the adhesive strength, the noodle is broken during the molding process of the polymer PTC element and incorporated into the conductive polymer polymer, which may act as an element that interferes with the PTC characteristics. You can not get as much adhesion.

The metal foil provided by the present invention can minimize the change of the adhesive strength due to the difference of the noodle layer, and since the uniform adhesion is made by the action of the silane coupling agent, the electrical conductivity can also be kept stable and uniform. have.

Claims (8)

Conductive polymer polymer; A polymer PTC device comprising a metal foil electrode attached to an upper surface and a bottom surface of the conductive polymer polymer, wherein the silane coupling agent is applied to the mat surface of the metal foil. The method of claim 1, The metal foil is a polymer PTC device, characterized in that the production using nickel plated electrolytic copper foil on both sides. The method of claim 1, The metal foil is a polymer PTC device, characterized in that the production using a nickel plated rolled copper foil on both sides. The method of claim 1, A metal foil is a polymer PTC device, which is produced using an electrolytic nickel foil. The method of claim 1, A silane coupling agent is a polymer PTC device characterized in that a vinyl trimethoxysilane (Vinyltrimethoxysilane) is mixed with pure water in a weight ratio of 0.1 to 10% applied to the metal foil mat surface. The method of claim 1, The silane coupling agent contains vinyltrimethoxysilane (0.1-10% by weight) and N- (2-aminoethyl) -3-aminopropyltrimethoxysilane (N- (2-aminoethyl) -3-aminopropyltrimethoxysilane). A polymer PTC device characterized by coating on a metal foil mat surface a mixture of pure water in a weight ratio of 0.1 to 10%. The method of claim 1, A silane coupling agent is a polymer PTC device characterized by coating a metal foil mat surface by mixing vinyl trimethoxysilane (0.1-10% by weight) and carbon black (0.1-1% by weight) with pure water. The method of claim 1, Silane coupling agent is 0.1 to 10% by weight of vinyltrimethoxysilane (N- (2-aminoethyl) -3-aminopropyltrimethoxysilane (N- (2-aminoethyl) -3 aminopropyltrimethoxy silane) The polymer PTC device which apply | coated to the metal foil mat surface which mixed with pure water at 0.1-10% of a weight ratio, and carbon black in 0.1-1% of a weight ratio.

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