Low-temperature PTC conducting composition, PTC over-current protection device and manufacturing method of PTC over-current protection device

A technology for overcurrent protection devices and conductive compositions, which is applied in the direction of resistors with positive temperature coefficients, conductive materials dispersed in non-conductive inorganic materials, etc., which can solve the problems of insufficient resistance self-recovery ability, heat resistance, Poor aging, poor resistance stability and other problems, to achieve the effect of excellent resistance stability, low operating temperature, high PTC strength

Active Publication Date: 2014-04-30
SHENZHEN HUIRUI ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are patent reports, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA) can be used as the substrate of PTC materials, and the melting point of these polymers It also meets the requirements of low-temperature PTC devices, but there are basically no PTC devices made of such polymers as substrates on the market. The reason is that these polymers have a common disadvantage, that is, their molecular chain structure contains double bonds, resulting in Its heat resistance and aging resistance are poor, and the resistance stability of PTC devices made of it is poor, and the resistance self-recovery ability is insufficient, so the practical value is not high

Method used

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  • Low-temperature PTC conducting composition, PTC over-current protection device and manufacturing method of PTC over-current protection device
  • Low-temperature PTC conducting composition, PTC over-current protection device and manufacturing method of PTC over-current protection device
  • Low-temperature PTC conducting composition, PTC over-current protection device and manufacturing method of PTC over-current protection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition and weight ratio of the PTC conductive composition of the present embodiment are as follows:

[0039]50.7wt% very low density polyethylene (VLDPE-1, Exact4023, melt index 3.5g / 10min, density 0.882g / cm 3 , melting point 73°C, Exxon Company), 43.5wt% conductive carbon black (carbon black-1: 3030B, particle size 55nm, DBP value 130cm 3 / 100g, Mitsubishi Carbon), 2.9wt% magnesium hydroxide (Mg(OH) 2 , HT-206, particle size 2μm, Jinan Taixing Chemical Industry), 2.9wt% zinc oxide (ZnO, ZHZn-01, particle size 40nm, Wuxi Huize Chemical Industry).

[0040] Weigh according to the mass ratio, and in order, add VLDPE-1 to the internal mixer with a set temperature of 100°C and a speed of 30r / min, banbury for 4 minutes until it melts, then add carbon black and banbury for 8 minutes, and finally add Magnesium hydroxide and zinc oxide were banburyed for 5 minutes to obtain a PTC conductive composition with PTC characteristics.

[0041] The above-mentioned PTC conduc...

Embodiment 2

[0046] The PTC device was fabricated according to the same method as described in Example 1, but the content of VLDPE-1 (Exact4023) was changed from 50.7wt% to 47.3wt%, and the content of conductive carbon black (carbon black-1, 3030B) was changed from 43.5 The wt% changed to 47.3wt%, the content of magnesium hydroxide (HT-206) changed from 2.9wt% to 2.7wt%, and the content of zinc oxide (ZHZn-01) changed from 2.9wt% to 2.7wt%. The physical properties of the PTC device were tested in the same manner as described in Example 1, and the results are listed in Table 2.

Embodiment 3

[0048] Manufacture the PTC device according to the same method as described in Example 1, but with 48.4wt% conductive carbon black (carbon black-2, Raven410, particle size 101nm, DBP value 65cm 3 / 100g, Columbian company) instead of 43.5wt% conductive carbon black (carbon black-1, 3030B) in Example 1, the content of VLDPE-1 (Exact4023) is changed from 50.7wt% to 44.3wt%, magnesium hydroxide ( HT-206) content changed from 2.9wt% to 2.5wt%, zinc oxide (ZHZn-01) content changed from 2.9wt% to 2.5wt%. The physical properties of the PTC device were tested in the same manner as described in Example 1, and the results are listed in Table 2.

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Abstract

The invention relates to a low-temperature PTC conducting composition, a PTC over-current protection device and a manufacturing method of the PTC over-current protection device. The low-temperature PTC conducting composition comprises, by weight, 40%-55% of organic polymer, 40%-55% of conducting carbon black and 1%-10% of voltage-resistant reinforcing filler. The PTC over-current protection device comprises the low-temperature PTC conducting composition. The PTC over-current protection device has an operating temperature lower than 80 DEG C, high PTC strength and good resistance stability, thereby being capable of achieving good over-current and over-temperature protection for circuits in a low-temperature environment.

Description

technical field [0001] The present invention relates to the technical field of conductive compositions, in particular to the technical field of positive temperature coefficient (Positive temperature coefficient, referred to as PTC) conductive compositions, and specifically refers to a low-temperature PTC conductive composition and a PTC superconductor with a low operating temperature of the composition. Current protection device and method of manufacturing the same. Background technique [0002] The so-called polymer PTC thermistor refers to a component that uses the positive resistance temperature characteristic of a conductive polymer that changes conductivity through thermal expansion, that is, the PTC (Positive temperature coefficient) characteristic, to turn on and off the circuit, referred to as PTC . [0003] The resistance of the PTC device remains basically constant under normal conditions. When a circuit fault causes a large current to pass through the PTC, its te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01C7/02C08L23/06C08L23/08C08K3/04
Inventor 徐行涛李大军朱建娟
Owner SHENZHEN HUIRUI ELECTRONICS MATERIALS
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