Method for preparing conductive polymer composite material from metal granule modified carbon black

A technology of conductive polymer and metal particles, which is applied in the field of preparing conductive polymer composite materials, can solve the problems of easy oxidation, affect the conductivity of composite materials, increase product cost, etc., and achieve the effect of increasing conductivity and promoting development and application.

Inactive Publication Date: 2006-10-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To increase the strength of PTC, the main method is to reduce the room temperature resistance of composite materials, which can increase the content of conductive fillers. However, this method will not only cause difficulties in processing, but also reduce the resistance at the peak position, and cannot effectively improve the strength of PTC.
The use of metal particles with good conductivity can reduce the room temperature resistance, but the general metal particles are easy to oxidize, which affects the conductivity of the composite material.
Using gold or platinum particles with good chemical stability will increase the cost of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Get 5 grams of carbon black and join the H(AuCl 4 ) solution, stirred mechanically for 1 hour, filtered out the carbon black with filter paper, rinsed the filtered carbon black with water, and dried at 110° C. for 24 hours, so that gold ions were adsorbed on the surface of the carbon black. Add carbon black with gold ions adsorbed on the surface to 5% NaBH 4 In the solution, gold particles were obtained by reducing gold ions on the surface of the carbon black, stirred magnetically for half an hour, filtered, rinsed with water, and dried at 110°C for 24 hours to obtain highly conductive carbon black with gold particles adsorbed on the surface. The treated carbon black and high-density polyethylene were mixed evenly at a weight ratio of 1:1.8, put into an internal mixer, mixed for 15 minutes at a temperature of 160°C, taken out, and molded into samples. Test sample resistance-temperature curve, room temperature resistivity (ρ 0 ), the highest resistivity (ρ max ) and P...

Embodiment 2

[0013] Get 5 grams of carbon black and add it to the H(AuCl 4 ) solution, stirred mechanically for 1 hour, filtered out the carbon black with filter paper, rinsed the filtered carbon black with water, and dried at 110° C. for 24 hours, so that gold ions were adsorbed on the surface of the carbon black. Add carbon black with gold ions adsorbed on the surface to 5% NaBH 4 In the solution, gold particles were obtained by reducing gold ions on the surface of the carbon black, stirred magnetically for half an hour, filtered, rinsed with water, and dried at 110°C for 24 hours to obtain highly conductive carbon black with gold particles adsorbed on the surface. The treated carbon black and high-density polyethylene were evenly mixed at a weight ratio of 1:2.0, put into an internal mixer, mixed for 12 minutes at a temperature of 170°C, taken out, and molded into samples. Test sample resistance-temperature curve, room temperature resistivity (ρ 0 ), the highest resistivity (ρ max ) ...

Embodiment 3

[0016] Get 5 grams of carbon black and add to the H(AuCl 4 ) solution, stirred mechanically for 1 hour, filtered out the carbon black with filter paper, rinsed the filtered carbon black with water, and dried at 110° C. for 24 hours, so that gold ions were adsorbed on the surface of the carbon black. Add carbon black with gold ions adsorbed on the surface to 5% NaBH 4 In the solution, gold ions on the surface of the carbon black were reduced to obtain gold particles, magnetically stirred for half an hour, filtered, the filtrate was rinsed with water, and dried at 110°C for 24 hours to obtain highly conductive carbon black with gold particles adsorbed on the surface. The treated carbon black and high-density polyethylene were mixed uniformly at a weight ratio of 1:3.1, put into an internal mixer, mixed for 18 minutes at a temperature of 180°C, taken out, and molded into samples. Test sample resistance-temperature curve, room temperature resistivity (ρ 0 ), the highest resistiv...

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PUM

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Abstract

The invention discloses a method to make metal particle modification carbon black making conductive macromolecule compounding material that includes the following steps; adding the carbon black into H(AuCl) solution that the thickness aurum iron is 150ppm-250ppm, whisking, filtering the carbon black and washing, drying to gain the carbon black that the surface is adsorbed aurum iron; putting the carbon black into NaBH solution, whisking and filtering, washing, drying to gain the carbon black that has aurum particle adsorbed on the surface; mixing the carbon black with high density polyethylene, devoting into Banbury mixer, milling for 12-18 minutes in 160-180 degree centigrade. The invention improves the PTC intension of the conductive macromolecule compound material.

Description

technical field [0001] The invention relates to a method for preparing conductive polymer composite materials, in particular to a method for preparing conductive polymer composite materials by using metal particle modified carbon black. Background technique [0002] Blending carbon black, carbon fiber or metal particles with some polymer matrix can obtain a conductive polymer composite material with a positive temperature coefficient (PTC) effect of resistance. The resistance of the composite material increases with the increase of temperature. In the polymer matrix Near the melting point of the polymer matrix, the resistance shows an order of magnitude sudden increase, and the temperature continues to rise. After the melting point of the polymer matrix, the resistance begins to drop again. The ratio of the highest resistance of the composite material to the room temperature resistance is usually called the PTC strength. Improving the strength of PTC is particularly importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K3/04C08K9/02
Inventor 沈烈乔飞郑强
Owner ZHEJIANG UNIV
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