Conductive composite material containing carbon nano tubes and preparation method thereof

A technology of conductive composite materials and single-walled carbon nanotubes, which is applied to conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problem that the content and dispersibility of CNTs cannot be effectively improved, and the structure of the graphitic tube wall and the electrical properties are destroyed. Influence and other problems, to achieve the effect of low cost, high content and improved dispersion performance

Active Publication Date: 2013-02-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the covalent modification of CNTs has good controllability, it will destroy its graphite-like tube wall structure and affect its electrical properties; non-covalent modification will not destroy the structure of the origina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Single-walled carbon nanotubes (SWCNTs) with a diameter and length of 0.75 nm and 0.1 μm, styrene-acrylonitrile copolymer (SAN) with an MFI of 4 g / 10 min were used as dispersant polymers, and polystyrene with an MFI of 3 g / min was used. Propylene (PP) was used to prepare conductive composites. The preparation process is as follows:

[0035] (1) Preparation of masterbatch: Mix SWCNTs and SAN chips uniformly at a mass ratio of 50:50 and add them to a twin-screw extruder. After melt blending at 195°C for 20 minutes, extrude and granulate to prepare a conductive masterbatch grain;

[0036] (2) Preparation of conductive composite materials: Mix the prepared conductive masterbatch and PP chips evenly at a mass ratio of 40:60, then add them to a twin-screw extruder, melt blend and extrude at 205 ° C, and prepare carbon-containing Conductive composites of nanotubes.

[0037] The content of carbon nanotubes in the prepared conductive composite material was 20wt%, and the cond...

Embodiment 2

[0039] Using multi-walled carbon nanotubes (MWCNTs) with diameters and lengths of 30 nm and 50 μm, respectively, styrene-acrylonitrile copolymer (SAN) with MFI = 6 g / 10 min as the dispersant polymer and polyoxymethylene with MFI = 20 g / min ( POM) to prepare conductive composites. The preparation process is as follows:

[0040] (1) Preparation of masterbatch: Mix MWCNTs and SAN chips evenly at a mass ratio of 50:50 and add them into a twin-screw extruder. After melt blending at 205°C for 12 minutes, extrude and granulate to prepare a conductive masterbatch grain;

[0041] (2) Preparation of conductive composite materials: Mix the prepared conductive masterbatch and POM chips evenly at a mass ratio of 2:98, then add them to a twin-screw extruder, melt blend and extrude at 215°C, and prepare carbon-containing Conductive composites of nanotubes.

[0042] The content of carbon nanotubes in the prepared conductive composite material was 1wt%, and the conductivity was 3.5×10 -4 S...

Embodiment 3

[0044] Multi-walled carbon nanotubes (MWCNTs) with a diameter and length of 12 nm and 3 μm, styrene-acrylonitrile copolymer (SAN) with an MFI of 5 g / 10 min were used as dispersant polymers and polylactic acid with an MFI of 3 g / min ( PLA) to prepare conductive composites. The preparation process is as follows:

[0045] (1) Masterbatch preparation: Mix MWCNTs and SAN slices evenly at a mass ratio of 25:75 and add them into a twin-screw extruder. After melt blending at 195°C for 10 minutes, extrude and granulate to prepare a conductive masterbatch grain;

[0046] (2) Preparation of conductive composite materials: Mix the prepared conductive masterbatch and PLA chips evenly at a mass ratio of 40:60, then add them to a twin-screw extruder, melt blend and extrude at 215°C, and prepare carbon-containing composite materials. Conductive composites of nanotubes.

[0047] The carbon nanotube content in the prepared conductive composite material was 10wt%, and the conductivity was 0.1...

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Abstract

The invention relates to a conductive composite material comprising carbon nano tubes and a preparation method thereof. The conductive composite material containing the carbon nano tubes comprises the following components: carbon nano tubes (CNTs), dispersant polymer and matrix polymer. The method comprises the following steps of: (1) evenly mixing the CNTs with polymer sections serving as a dispersant by mass percent of (5-50):(95-50), and carrying out melt blending, extrusion and granulation by a double-screw extruder to obtain masterbatches, wherein the polymer sections contain benzene rings and nitrile groups; and (2) adding the prepared masterbatches and pure thermoplastic polymer sections into the double-screw extruder in mass ratio of (2-40):(98-60), and then carrying out melt blending and extrusion to obtain the conductive composite material. The preparation process disclosed by the invention has simple process, does not need to perform covalent modification on the CNTs and does not destroy the structure of the CNTs, the CNTs have good dispersibility, and the prepared composite material has high content of CNTs and good conductibility.

Description

technical field [0001] The invention relates to a conductive composite material containing carbon nanotubes and a preparation method thereof, in particular to a conductive masterbatch containing carbon nanotubes and a preparation method thereof, and a conductive composite material containing carbon nanotubes and a preparation method thereof , more specifically relates to the use of a class of polymers containing both aromatic rings and nitrile groups as dispersant polymers to prepare masterbatches with high carbon nanotube content through non-covalent modification methods and the use of the masterbatches to prepare composite materials method. Background technique [0002] The unique structure of carbon nanotubes (CNTs) endows them with excellent mechanical, electrical and thermal properties, making them have broad application prospects in improving the mechanical properties of polymers and preparing conductive composite materials and conductive composite fibers. Therefore, ...

Claims

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Application Information

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IPC IPC(8): C08L25/12C08L55/02C08L71/10C08K7/00C08K3/04C08J3/22C08L23/12C08L23/06C08L67/04C08L59/00C08L77/00C08L67/00C08L75/04B29C47/92H01B1/24B29C48/92
CPCB29C48/04B29C48/40
Inventor 邹黎明徐速何钧炜倪建华凌新龙掌婷婷
Owner DONGHUA UNIV
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