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Polyaniline/carbon conducting composite material with low resistance temperature coefficient, as well as preparation method and application thereof

A conductive composite material and temperature coefficient technology, applied in conductive coatings, polyurea/polyurethane coatings, resistors, etc., can solve problems such as large resistance change rates, achieve improved linearity, excellent environmental stability, and good environmental stability Effect

Inactive Publication Date: 2013-04-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of the high resistance change rate of the resistor body of the precision potentiometer in the prior art, the present invention provides a polyaniline / carbon conductive composite material with a low temperature coefficient of resistance and its preparation method and application

Method used

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preparation example Construction

[0033] The present invention also provides the preparation method of the above-mentioned polyaniline / carbon conductive composite material with low temperature coefficient of resistance, the method comprises the following steps:

[0034] Weigh each component according to the composition of the composite material,

[0035] (1) matrix resin is added in the reaction device;

[0036] (2) Slowly add the conductive polyaniline solution and the solvent into the reaction device under stirring, stir for 0.5-5h, and the stirring rate is 1200-1500r / min to obtain a blend;

[0037] (3) Slowly add the conductive carbon material to the above-mentioned blend solution under stirring, stir for 0.5-3h, and the stirring rate is 1200-1500r / min, to obtain the mixed solution;

[0038] (4) The mixed solution is ball-milled or sand-milled repeatedly to make the fineness less than 10 μm to obtain a polyaniline / carbon conductive composite material with a low temperature coefficient of resistance.

[00...

Embodiment 1

[0048] Preparation of polyaniline / carbon conductive composites with low temperature coefficient of resistance:

[0049] Take by weighing 25g epoxy resin / acid anhydride curing agent and add in reaction unit, under mechanical stirring (1200r / min), the toluene solution of 5g dodecylbenzenesulfonic acid doping polyaniline and 40g xylene are slowly added in reaction unit , stirred (1300r / min) for 0.5h to obtain a dispersion, weighed 10g of conductive carbon black, 20g of conductive graphite, added to the above dispersion under high-speed stirring (1500r / min), stirred (1200r / min) for 2h, and ball milled 48h, to make the fineness below 10μm, to obtain polyaniline / carbon conductive composite material with low temperature coefficient of resistance.

Embodiment 2

[0051] Preparation of polyaniline / carbon conductive composites with low temperature coefficient of resistance:

[0052] Take by weighing 20g epoxy resin / acid anhydride curing agent and add in the reaction device, under mechanical stirring (1200r / min), the toluene solution and 27g toluene of 50g dodecylbenzenesulfonic acid doped polyaniline are slowly added in the reaction device , stirred (1200r / min) for 2h to obtain a dispersion, weighed 3g of conductive carbon black, added it to the above dispersion under high-speed stirring (1300r / min), stirred (1300r / min) for 3h, and ball milled for 48h to make it fine The degree is less than 10 μm, and the polyaniline / carbon conductive composite material with low temperature coefficient of resistance is obtained.

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PUM

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Abstract

The invention discloses polyaniline / carbon conducting composite material with low resistance temperature coefficient, as well as a preparation method and the application thereof, and solves the disadvantage that the resistance change rate of a resistor body of a precision potentiometer is large under high temperature in the prior art. The composite material comprises the following components in weight percentage: 5 to 60 wt% of conductive polyaniline solution, 3 to 35 wt% of conducting carbon material, 10 to 30 wt% of matrix resin, and the balance of solvent. The invention further provides a preparation method of the composite material and the application in manufacturing the resistor body of the precision potentiometer. The resistance temperature coefficient of the resistor body is smaller than 350 ppm / DEG C within the temperature range from minus 55 to plus 125 DEG C, and the resistance change rate is smaller than 5 percent after the resistor body is stored for 48h at 125 DEG C or stored for 24h at minus 55 DEG C, and the service life of the resistor body is longer than 4 million times.

Description

technical field [0001] The invention relates to a polyaniline / carbon conductive composite material with a low temperature coefficient of resistance and a preparation method and application thereof, belonging to the technical field of composite materials. Background technique [0002] With the development of microcomputer control technology, resistive elements such as potentiometers used as electromechanical converters must meet many requirements such as high resolution, high precision, and long service life. For precision potentiometers, they must also have high environmental stability (endurance Temperature) and low temperature coefficient of resistance and other characteristics. [0003] The early precision potentiometers were synthetic carbon film potentiometers, but synthetic carbon film potentiometers had the disadvantages of poor linearity, moisture resistance and poor resistance stability, and were gradually replaced by conductive plastic potentiometers. The existing...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D175/04C09D133/00C09D179/02C09D5/24H01C7/06
Inventor 刘年江鞠洪岩李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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