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Conductive polymer composition and overcurrent protection element made from same

A technology of conductive polymers and compositions, applied in conductive materials dispersed in non-conductive inorganic materials, resistors with positive temperature coefficients, etc., can solve the problem of poor environmental resistance, low room temperature resistance, and low room temperature resistivity and other problems, to achieve the effect of excellent environmental resistance and low room temperature resistance

Inactive Publication Date: 2011-09-07
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing disclosed technology, the most common is to use carbon black as a conductive filler material, but it is difficult to obtain a very low room temperature resistivity by using carbon black as a conductive polymer prepared by a conductive filler material, especially the polymer When used to prepare overcurrent protection components for batteries (packs), the requirements for device miniaturization and low room temperature resistance will not be met.
Although using metal particles (such as nickel powder) as a conductive filling material can produce conductive polymers with lower room temperature resistivity, the overcurrent protection components prepared with such conductive polymers have poor environmental resistance. Specifically, when the component is placed at high temperature, as time goes on, the room temperature resistance of the component will gradually increase until it fails

Method used

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  • Conductive polymer composition and overcurrent protection element made from same
  • Conductive polymer composition and overcurrent protection element made from same
  • Conductive polymer composition and overcurrent protection element made from same

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Experimental program
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Embodiment

[0045] Each component is proportioned according to Table 1:

[0046]

[0047] Immerse the nickel powder CNP525 in Table 1 in the ethanol solution of silane coupling agent KBE903, stir with a dry mixer for 30 minutes, and place it in a vacuum oven (vacuum degree: 10 -1 MPa, temperature 25°C) to remove ethanol by drying for 24 hours to obtain anti-oxidation treated nickel powder.

[0048] Put the treated nickel powder, high-density polyethylene and EVA wax into the internal mixer in turn, mix evenly at 190°C, pull out a sheet with a thickness of about 0.65mm on the open mixer, and cut it into 200mm×200mm The core material 1, put a piece of metal foil 2, 2' on the upper and lower sides respectively, and press it into a composite chip with a thickness of about 0.6mm on a press at 180°C. The composite chip is irradiated with an electron beam, and the irradiation dose is 10 Mrad to 100 Mrad. Then this chip is punched or cut into chips of 3mm * 4mm, and a nickel sheet with a si...

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Abstract

The invention relates to a conductive polymer composition and an overcurrent protection element prepared from the same. The polymer composition comprises the following components in percentage by weight: 5 to 30 percent of crystalline high molecular polymer, 50 to 95 percent of conductive metal filling material and 1 to 20 percent of polyethylene wax, wherein the conductive filling material may be one or compositions of more than one of nickel powder, silver powder and gold powder. A method for preparing the overcurrent protection element from the conductive polymer composition comprises the following steps of: firstly, mixing the composition, and drawing the mixed composition to form a sheet; secondly, laminating metal foils onto the upper and lower surfaces of the sheet; thirdly, performing irradiation and stamping to mold a chip meeting size requirements; and fourthly, welding a nickel sheet onto the chip as an extraction electrode to obtain the required overcurrent protection element. The overcurrent protection element prepared from the conductive polymer composition has the advantages of low room temperature resistance and high environmental resistance.

Description

technical field [0001] The invention relates to a conductive polymer and an overcurrent protection element, in particular to a conductive polymer composition with a positive temperature coefficient (PTC) characteristic and an overcurrent protection element prepared therefrom. Background technique [0002] A conductive polymer composed of a polymer and a conductive filler material dispersed in the polymer and an overcurrent protection element prepared from the conductive polymer with a positive temperature coefficient (PTC) characteristic are well known. Usually, the PTC conductive polymer is composed of one or more crystalline polymers and a conductive filling material, and the conductive filling material is uniformly dispersed in the polymer. The conductive filling material can be one of polyethylene, ethylene copolymer, fluoropolymer or a mixture of several of them; the conductive filling material can be carbon black, metal particles or inorganic ceramic powder. The PTC c...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01C7/02
Inventor 王军刘正平李从武
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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