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Method for mixing preparation of carbon nano tube/polymer composites

A technology of carbon nanotubes and composite materials, which is applied in the field of preparation of polymer composite materials, can solve the problems that the advantages of designability of composite materials cannot be fully exerted, the cost of composite materials and products is increased, and carbon nanotubes are wasted. Achieve the effect of optimizing the network structure design, improving the effective utilization rate, and reducing the amount of addition.

Inactive Publication Date: 2010-06-02
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for thermally conductive and electrically conductive composite materials, this uniform dispersion prevents a large number of carbon nanotubes from participating in the construction of the electric heat transport network, resulting in a great waste of carbon nanotubes, which will inevitably increase the cost of composite materials and products.
In addition, the traditional preparation methods of carbon nanotube / polymer composites cannot realize the artificial adjustment and control of the microstructure of the composite material, so that the advantages of the structural designability of the composite material cannot be fully utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The high-density polyethylene resin is crushed and then sieved to obtain particles with a particle size of 50-200 microns for use. Disperse 0.01 g of carbon nanotubes in 10 g of absolute ethanol and form a stable suspension after ultrasonication for 2 hours. Add 10 grams of high-density polyethylene particles to the suspension, and continue ultrasonic oscillation for 60 minutes. When the surface of the polymer particles is completely covered by carbon nanotubes, heat and evaporate to remove the solvent, and form carbon nanotube-high-density polyethylene particles Pour the mixed system into a mold, heat it to 180°C until the high-density polyethylene melts; apply a pressure of 10 MPa and keep it for 5 minutes, so that the high-density polyethylene resin flows and forms an integration with the carbon nanotube network; cool to room temperature , demoulding, and a carbon nanotube / high-density polyethylene composite material was obtained; its volume resistivity at room tempe...

Embodiment 2

[0028] Select polypropylene particles with a particle size between 50 and 200 microns for use; disperse 0.5 g of carbon nanotubes in 30 g of absolute ethanol, and form a stable suspension after ultrasonic oscillation for 2 hours. Add 10 grams of high-density polyethylene particles into the suspension, and continue ultrasonic oscillation for 60 minutes. When the surface of the polymer particles is completely covered by carbon nanotubes, heat and evaporate to remove the solvent to form a uniform carbon nanotube-polypropylene particle mixture. system; pour the mixed system into a mold, heat to 200 ° C until the polypropylene melts; apply a pressure of 10 MPa and keep it for 5 minutes, so that the polypropylene resin flows and forms an integration with the carbon nanotube network; cool to room temperature, demold, and make A carbon nanotube / polypropylene composite material was obtained; its volume resistivity at room temperature was 7.35×10 2 ohm cm.

Embodiment 3

[0030] The polymethyl methacrylate pellets are pulverized and sieved to obtain particles with a particle diameter between 100 and 200 microns for use. 2 g of carbon nanotubes were dispersed in 50 g of isopropanol, and a stable suspension was formed after ultrasonication for 2 hours. Add 10 grams of polymethyl methacrylate particles into the suspension and continue ultrasonic oscillation for 60 minutes. When the surface of the polymer particles is completely covered by carbon nanotubes, remove the solvent by vacuum filtration to form uniform carbon nanotubes-high Density polyethylene particle mixing system; pour the mixed system into a mold, heat to 180°C until the polymethyl methacrylate melts; apply a pressure of 10MPa and keep it for 5 minutes, so that the resin flows and forms an integration with the carbon nanotube network; cooling To room temperature, demoulding, obtained carbon nanotube / polymethyl methacrylate composite material; Its volume resistivity at room temperatur...

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Abstract

The invention provides a method for the mixing preparation of carbon nano tube / polymer composites, relating to the technical field of the preparation of functional polymer materials and apparatus. The preparation process comprises the following steps of: dispersing carbon nano tubes in a solvent in advance to form a stable supernatant solution; pouring in thermoplastic resin particles which are distributed at intervals of a certain particle diameter, and fully and evenly mixing by sonic oscillation so that the surfaces of the polymer particles are fully coated with the carbon nano tubes; drying and removing the solvent to form a mixed system of the carbon nano tubes and the polymer particles, filling in a mold, heating to melt the thermoplastic resin, integrating the melt thermoplastic resin and carbon nano tube networks under the pressure, and cooling and demolding to obtain carbon nano tube / polymer composites. The method has the advantages of simple process, good material structure control and low cost, and can be used for designing and manufacturing functional composites with specific transport network structures by selecting different types of resin substrates and molding process conditions based on operating requirements, thereby having great design freedom.

Description

technical field [0001] The invention relates to a preparation method of a polymer composite material, in particular to a hybrid preparation method of a carbon nanotube / polymer composite material. Background technique [0002] Carbon Nanotube (Carbon Nanotube, see: Iijima S. Helical Microtubles of Graphic Carbon, Nature, 1991, 354: 56-58) has a unique curly graphite sheet structure and nanoscale features, with its excellent physical mechanics and electrothermal transmission It has extremely broad application prospects in the fields of mechanical enhancement, electromagnetic shielding, nano (micro) devices, and clean energy. Due to the small size of carbon nanotubes, complex control, and high cost, their application is greatly limited; the preparation of carbon nanotube / polymer composites can combine the excellent physical properties of carbon nanotubes and the convenient processing and molding properties of polymers. It is an effective way to realize the commercial applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L27/06C08L23/12C08L77/00C08L25/06C08L59/02C08L27/18C08L69/00C08L71/12C08L81/06C08K7/00
Inventor 曾尤赵龙杜金红刘鹏飞佟钰赵金波
Owner SHENYANG JIANZHU UNIVERSITY
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