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Method for producing carbon nano-tube/composite conducting polymer material

A technology of conductive composite materials and carbon nanotubes, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of carbon nanotubes that cannot be uniformly dispersed, and achieve good PTC effect, uniform dispersion, and simple operation process Effect

Inactive Publication Date: 2008-05-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency that the prior art cannot uniformly disperse carbon nanotubes, the present invention provides a method for preparing carbon nanotube / polymer conductive composite materials, which can realize uniform dispersion of carbon nanotubes at high filling levels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1. Add 2g of high-density polyethylene to 100g of o-dichlorobenzene, keep the temperature at 120°C for 2-8 hours, and keep stirring until the polymer is fully dissolved in o-dichlorobenzene, then stop heating and cool to room temperature;

[0017] Step 2. Mix 20 mg of MWNTs with an average diameter of 10-20 nm and an average length of 5-15 μm with 100 g of o-dichlorobenzene, and ultrasonically disperse them in an ultrasonic pulverizer with a power of 650 W and a frequency of 20-25 KHz for 10 minutes to uniformly disperse the MWNTs into o-dichlorobenzene;

[0018] Step 3. Mix the two solutions formed in step 1 and step 2, and place them in a 650W ultrasonic pulverizer for ultrasonic dispersion for 10 minutes, so that MWNTs, high-density polyethylene, and o-dichlorobenzene are evenly mixed;

[0019] Step 4. Use slow qualitative filter paper to suction filter the mixed solution obtained in step 3;

[0020] Step 5. The solid mixture obtained by filtering in step 4 is...

Embodiment 2

[0023] Step 1. Add 1 g of high-density polyethylene to 70 g of o-dichlorobenzene, keep the temperature at 120°C for 2 to 8 hours, and keep stirring until the polymer is fully dissolved in the solvent, then stop heating and cool to room temperature;

[0024] Step 2. Mix 0.2 g of MWNTs with an average diameter of 60 to 100 nm and an average length of 5 to 25 μm with 300 g of o-dichlorobenzene, and ultrasonically disperse them in an ultrasonic pulverizer with a power of 900 W and a frequency of 20 to 25 KHz for 20 minutes to make the MWNTs Uniformly dispersed in o-dichlorobenzene;

[0025] Step 3. Mix the two solutions formed in step 1 and step 2, and place them in a 900W ultrasonic pulverizer for ultrasonic dispersion for 30 minutes, so that MWNTs, high-density polyethylene, and o-dichlorobenzene are evenly mixed;

[0026] Step 4. Use slow qualitative filter paper to suction filter the mixed solution obtained in step 3;

[0027] Step 5. The solid mixture obtained by filtering i...

Embodiment 3

[0030] Step 1. Add 2g of high-density polyethylene to 100g of xylene, keep the temperature at 110°C for 2-8 hours, and keep stirring until the polymer is fully dissolved in xylene, then stop heating and cool to room temperature;

[0031] Step 2. Mix 20 mg of MWNTs with an average diameter of 10 to 20 nm and an average length of 1 to 20 μm with 100 g of xylene, and ultrasonically disperse them in an ultrasonic pulverizer with a power of 650 W and a frequency of 20 to 25 KHz for 10 minutes to uniformly disperse the MWNTs to two in toluene;

[0032] Step 3. Mix the two solutions formed in step 1 and step 2, and place them in a 650W ultrasonic pulverizer for ultrasonic dispersion for 10 minutes, so that the MWNTs, high-density polyethylene, and xylene are evenly mixed;

[0033] Step 4. Use slow qualitative filter paper to suction filter the mixed solution obtained in step 3;

[0034] Step 5. The solid mixture obtained by filtering in step 4 is vacuum-dried at 80-100° C. for 10-50...

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Abstract

The invention discloses a preparation method of a carbon nanotube / polymer conductive composite material. 0.3 to 0.8 parts of polymer are added into 18.9 to 57.8 parts of solvent and continuously stirred under the temperature ranging from 110 to 150 DEG C till the polymer is sufficiently dissolved, and then the polymer is cooled to the room temperature; 0.054 to 0.008 parts of carbon nanotube and 80.746 to 41.392 parts of solvent are mixed and put into an ultrasonic mill as ultrasound evenly disperses the carbon nanotube into the solvent; subsequently, the two solutions are mixed and put into the ultrasonic mill as the ultrasound evenly mixes the solution; the slow qualitative filter paper extracts and filters the mixed solution, and the obtained solid mixture is vacuumized and dried under the temperature ranging from 80 to 100 DEG C till the weight is constant; finally, the dried solid material is hot molded, and the carbon nanotube / polymer conductive composite material can be obtained. The invention ensures that the polymer evenly disperses in the carbon nanotube.

Description

technical field [0001] The invention relates to a chemical preparation method, in particular to a preparation method of a conductive composite material. Background technique [0002] Composite conductive polymer materials are mostly blended with conductive fillers and polymers, and they have been widely used in antistatic and electromagnetic shielding fields. Positive temperature coefficient of resistivity (PTC) material is one of the conductive polymer composite materials with special functions. The basic principle of this special functional material is to use the conductive network formed by conductive fillers to respond to changes in external temperature (expressed as changes in resistivity) to play a control or sensing role. Polymer PTC materials have been widely used in communication, microelectronics and other fields as overload protection or self-temperature control components. Polymer PTC materials are usually made of carbon black filled polyethylene. As an overloa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/20C08L23/06C08L23/12C08K3/04H01B1/24
Inventor 季铁正孔德鹏刘文亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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