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Conductive carbon/polymer based composite material and preparation method thereof

A composite material and conductive carbon technology, which is applied in the field of conductive carbon/polymer-based composite materials and its preparation, can solve the problem of high cost, achieve low cost, improve electrical conductivity, and uniform distribution

Active Publication Date: 2015-12-02
SHENZHEN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The in-situ polymerization method forms a covalent bond between the conductive carbon and the polymer through the polycondensation reaction, which strengthens the interface between the conductive carbon and the polymer. Not applicable, and the cost is higher

Method used

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  • Conductive carbon/polymer based composite material and preparation method thereof
  • Conductive carbon/polymer based composite material and preparation method thereof

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preparation example Construction

[0038] Second aspect, such as figure 1 as shown, figure 1 It is a process flow diagram of the preparation method of the conductive carbon / polymer-based composite material according to an embodiment of the present invention; it includes the following steps:

[0039] (1) dispersing the conductive carbon in a solvent to obtain a conductive carbon dispersion;

[0040] (2) heating the solid polymer to obtain a molten polymer;

[0041] (3) Add conductive carbon dispersion liquid to the polymer in molten state, the weight of conductive carbon is 1%-45% of solid polymer weight, heat and stir to remove solvent, the temperature of heating is higher than step (2) solid The heating and melting temperature of the polymer is 0-10°C higher to obtain a molten mixed material;

[0042] (4) Pour the mixed material in the molten state into the mould, rapidly cool and form, and demould to obtain a conductive carbon / polymer-based composite material. In the conductive carbon / polymer-based composi...

Embodiment 1

[0080] A method for the preparation of conductive carbon / polymer matrix composites, such as figure 2 as shown, figure 2 The process flow chart of the preparation method of the conductive carbon / polymer-based composite material for the implementation of the present invention includes the following steps:

[0081] (1) Take 100g of carbon nanotubes and place them in 1200mL of concentrated sulfuric acid and concentrated nitric acid in a mixed acid with a volume ratio of 3:1, react at 40°C for 2h, then filter, and wash the filter residue with water for several times until the washing solution is neutral. Carrying out vacuum drying and grinding to obtain surface-modified carbon nanotubes, taking the surface-modified carbon nanotubes and placing them in absolute ethanol, grinding for 2 hours to obtain a carbon nanotube dispersion with a mass fraction of carbon nanotubes of 5%;

[0082] (2) Heat 2000g of solid polylactic acid at 250°C to melt, and add a small amount of DMF during t...

Embodiment 2

[0088] A preparation method of conductive carbon / polymer-based composite material, comprising the following steps:

[0089] (1) Take 100g of carbon nanotubes in 1000mL of concentrated sulfuric acid, react at 25°C for 5h, then filter, wash the filter residue with water several times until the washing liquid is neutral, then carry out vacuum drying and grinding to obtain surface-modified carbon For nanotubes, the surface-modified carbon nanotubes were placed in N-methylpyrrolidone (NMP), and ball milled for 2 hours to obtain a carbon nanotube dispersion with a mass fraction of carbon nanotubes of 5%;

[0090] (2) Heat 2000g of solid polycaprolactone at 120°C to melt, add NMP during the melting process to adjust the viscosity, and stir to obtain molten polylactic acid of suitable viscosity;

[0091] (3) Add the carbon nanotube dispersion to molten polycaprolactone (PCL), heat and evaporate at 120° C. and stir and mix to remove most of the solvent. The weight of the carbon nanotub...

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Abstract

The invention provides a conductive carbon / polymer based composite material comprising conductive carbon and a polymer, wherein the weight of the conductive carbon accounts for 1-45% of that of the polymer. The invention also provides a preparation method of the composite material. The preparation method comprises the following steps: (1) dispersing the conductive carbon in a solvent to obtain conductive carbon dispersion; (2) heating a solid polymer to obtain molten dispersion; (3) adding the conductive carbon dispersion into the molten dispersion, heating and stirring uniformly to remove the solvent so as to obtain a molten mixed material, wherein the weight of the conductive carbon accounts for 1-45% of that of the solid polymer, and the heating temperature is 0-10 DEG C higher than the melting temperature of the solid polymer; and (4) pouring the molten mixed material into a mold, cooling quickly for molding, and demolding to prepare the conductive carbon / polymer based composite material. By adopting the preparation method provided by the invention, the problems of the prior art are solved; and the preparation method is simple in process, relatively low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of polymer-based composite materials, in particular to a conductive carbon / polymer-based composite material and a preparation method thereof. Background technique [0002] At present, due to the good performance of low melting point polymer materials such as polylactic acid, it is rapidly applied in various fields. In order to improve the conductivity of polymer materials, conductive carbon such as carbon nanotubes, SP or expanded graphite is often added to low-melting polymer materials to obtain conductive carbon / polymer matrix composites with good electrical conductivity. [0003] At present, the commonly used preparation methods of conductive carbon / polymer matrix composites include melt blending, solution blending and in situ polymerization. The melt blending method is to directly add conductive carbon to the polymer in the molten state, and mix it by mechanical stirring to form a composite material. This method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/02C08K9/04C08K7/24C08K7/06C08K3/04
Inventor 孔令涌方东升尚伟丽黄少真
Owner SHENZHEN DYNANONIC
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