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Material with positive temperature coefficients

A technology with positive temperature coefficient and conductive particles, applied to conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of low PTC strength and achieve the effects of improved compatibility, high PTC strength, and low room temperature resistivity

Active Publication Date: 2010-02-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low defect of the PTC intensity of the PTC composite material in the above-mentioned prior art, and provide a kind of positive temperature coefficient material that the PTC intensity is higher and still can maintain lower room temperature resistivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 100 g of Ni powder with an average particle diameter of 1 micron was ball-milled with 10 g of water for 0.5 hour, and then dried at 120° C. for 3 hours in an air atmosphere to obtain a treated Ni powder product.

[0026] X-ray energy spectrum analysis shows that the oxygen content in the untreated Ni powder is 3×10 -4 % by weight, while the oxygen content of the treated Ni powder product is 0.009% by weight. The spectrum after phase analysis by XRD shows that the main phase of the Ni powder product after treatment is Ni phase, and its peak intensity is the largest, and there is also NiO phase, but the peak intensity of NiO phase is very small. The above results can show that the oxygen content in the Ni powder product after the above treatment increases, but the main phase is still Ni phase, and the content of NiO is very small, so the Ni powder is only partially oxidized on the surface.

[0027] Adopt the NASER mixer of Dongguan Najin Machinery Co., Ltd. to mix the pr...

Embodiment 2

[0033] The positive temperature coefficient product was prepared according to the method described in Example 1, except that Cu powder with an average particle diameter of 0.05 μm was used, and when processing the metal Cu powder, 100 g of the metal Cu powder was mixed with 5 g of water for ball milling.

[0034]The X-ray energy spectrum analysis of the treated Cu powder product shows that the oxygen content in the product is 0.008% by weight. And the collection of spectra obtained by XRD analysis is similar to that of Example 1.

[0035] The conductive particle content in the positive temperature coefficient product was 63% by weight, and the polymer content was 37% by weight.

[0036] Use the CHI660B electrochemical workstation of Shanghai Chenhua Company to measure the room temperature resistivity of the prepared positive temperature coefficient product as 0.11Ωcm, and measure the corresponding maximum resistivity at the switch temperature point of 95°C as 3.49×10 8 Ωcm, t...

Embodiment 3

[0038] The positive temperature coefficient product was prepared according to the method described in Example 1, except that Ag powder with an average particle diameter of 4 microns was used, and when processing the metal Ag powder, 100 g of the metal Ag powder was mixed with 15 g of water for ball milling.

[0039] X-ray energy spectrum analysis of the treated Ag powder product showed that the oxygen content in the product was 0.013% by weight. And the collection of spectra obtained by XRD analysis is similar to that of Example 1.

[0040] The conductive particle content in the positive temperature coefficient product is 60% by weight, and the polymer content is 40% by weight.

[0041] Use the CHI660B electrochemical workstation of Shanghai Chenhua Company to measure the room temperature resistivity of the prepared positive temperature coefficient product as 0.13Ωcm, and measure the corresponding maximum resistivity at the switch temperature point of 95°C as 1.03×10 8 Ωcm, t...

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Abstract

The invention provides a material with positive temperature coefficients, which is a product obtained by mixing a mixture containing conductive particles and polymers, wherein the conductive particlesare metal conductive particles with partially oxidized surfaces, and the oxygen content in the conductive particles is between 0.001 and 0.05 percent by weight. According to the material with positive temperature coefficients, the conductive particles are the metal conductive particles with partially oxidized surfaces so that the compatibility between the conductive particles and the polymers andthe dispersity of the conductive particles in the polymers can be improved; moreover, the material with positive temperature coefficients has high PTC intensity reaching as high as 10.4, and can still maintain low room-temperature resistivity at the same time.

Description

technical field [0001] The invention relates to a positive temperature coefficient material. Background technique [0002] Positive temperature coefficient (PTC) polymer composite materials are widely used in computers and their peripheral equipment, mobile phones, battery packs, telecommunication and network equipment, transformers, industrial control equipment, automobiles and other electronic products to play the role of overcurrent or overcurrent The role of thermal protection. The PTC composite material mainly contains crystalline polymer and conductive particles, and its characteristic is that the resistivity of the material will increase sharply with the increase of temperature in a narrow temperature range (near the glass transition temperature of the polymer). The narrow temperature range can suddenly increase by several or even ten orders of magnitude. With the help of the relationship between the resistivity and temperature, the positive temperature coefficient c...

Claims

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Application Information

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IPC IPC(8): C08L101/00C08K9/02C08L23/06C08L23/12C08L31/04C08L27/16C08L27/12H01B1/20H01B1/22
Inventor 林信平刘倩倩宫清
Owner BYD CO LTD
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