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Electrically conductive composite fiber containing carbon nanotubes and preparation method of fiber

A technology of conductive composite fibers and carbon nanotubes, which is applied in the manufacture of conductive/antistatic filaments, fiber treatment, stretch spinning, etc., can solve the problems of poor dispersion, complicated preparation process, and low CNTs content, and achieve improved dispersion High performance, excellent electrical conductivity, and simple process

Active Publication Date: 2013-01-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the sample composition is 30wt%PP, 65wt%PA, 5wt%CNT and 1phr compatibilizer, after 3 times drafting of the as-spun fiber obtained, although the mechanical properties of the fiber are improved, the electrical conductivity is only 10 -6 S / cm
[0008] Among the above methods for preparing CNTs / polymer composite fibers, the solution spinning method and the electrospinning method have the disadvantages of covalent modification of CNTs and complicated preparation process, and the electrospinning method is still far away from industrialization.
The melt spinning method has simple process and low cost, but the existing method needs to prepare or purchase masterbatches containing CNTs first, and has the disadvantages of low CNTs content and poor dispersibility, and the prepared composite fiber has poor electrical conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Single-walled carbon nanotubes (SWCNTs) with diameter and length of 0.75nm and 0.1μm, styrene-acrylonitrile copolymer (SAN) with MFI=5.0g / 10min were used as the dispersant polymer and MFI=26.0g / min Polypropylene (PP) was used as the matrix polymer to prepare conductive composite fibers. The preparation process is as follows:

[0034] (1) Preparation of primary fibers: Mix and stir SWCNTs, SAN slices and PP slices at a mass ratio of 3:3:94, and then use a twin-screw extruder to melt, filter, spin, and cool to form conductive composite primary fibers . Wherein the rotating speed of twin-screw extruder is 35rpm; Pressure is 25kg / cm 2 ; In the twin-screw heating area, the temperature in the first zone is 190°C, the temperature in the second zone is 190°C, the temperature in the third zone is 190°C, and the temperature in the fourth zone is 200°C; the spinning speed is 1500m / min.

[0035] (2) Stretching and heat setting of as-spun fibers: The conductive composite fibers w...

Embodiment 2

[0038] Multi-walled carbon nanotubes (MWCNTs) with a diameter and length of 30 nm and 50 μm, styrene-acrylonitrile copolymer (SAN) with an MFI of 3.5 g / 10 min were used as dispersant polymers, and polystyrene with an MFI of 40.0 g / min was used. Ethylene (PE) was used as the matrix polymer to prepare conductive composite fibers. The preparation process is as follows:

[0039] (1) Preparation of primary fibers: MWCNTs, SAN slices and PE slices were mixed and stirred at a mass ratio of 8:8:84, and then melted, filtered, spun, and cooled with a twin-screw extruder to obtain conductive composite primary fibers . Wherein the rotating speed of twin-screw extruder is 110rpm; Pressure is 90kg / cm 2 ; In the twin-screw heating area, the temperature in the first zone is 190°C, the temperature in the second zone is 190°C, the temperature in the third zone is 190°C, and the temperature in the fourth zone is 200°C; the spinning speed is 3000m / min.

[0040] (2) Stretching and heat setting ...

Embodiment 3

[0043] Single-walled carbon nanotubes (SWCNTs) with diameters and lengths of 12 nm and 3 μm, styrene-acrylonitrile copolymer (SAN) with MFI=5 g / 10 min were used as dispersant polymers and polylactic acid with MFI=3.0 g / min (PLA) was used as the matrix polymer to prepare conductive composite fibers. The preparation process is as follows:

[0044] (1) Preparation of primary fibers: Mix and stir SWCNTs, SAN chips and PLA chips at a mass ratio of 4:8:88, then melt, filter, spin, and cool to form conductive composite primary fibers with a twin-screw extruder . Wherein the rotating speed of twin-screw extruder is 180rpm; Pressure is 165kg / cm 2 ; In the twin-screw heating area, the temperature in the first zone is 200°C, the temperature in the second zone is 200°C, the temperature in the third zone is 205°C, and the temperature in the fourth zone is 215°C; the spinning speed is 1600m / min.

[0045] (2) Stretching and heat setting of as-spun fibers: The conductive composite fibers w...

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Abstract

The invention relates to an electrically conductive composite fiber containing carbon nanotubes and a preparation method of the fiber. The electrically conductive composite fiber containing the carbon nanotubes comprises the components of the carbon nanotubes, dispersant polymer and matrix polymer. The preparation method comprises the following steps: mixing and stirring the carbon nanotubes, resin slices of the dispersant polymer and slices of the matrix polymer; then fusing, filtering, spinning, cooling and molding by using a double-screw extruder; and preparing the electrically conductive composite fiber through stretching and thermal forming. The electrically conductive composite fiber containing the carbon nanotubes prepared by the method has the advantages of being high in content of carbon nanotubes, good in dispersivity, high in electrical conductivity, simple in manufacturing technology, low in cost, and the like.

Description

technical field [0001] The invention relates to a conductive composite fiber containing carbon nanotubes and a preparation method thereof, in particular to using a polymer containing aromatic rings and nitrile groups as a dispersant so that carbon nanotubes can be uniformly dispersed in a matrix polymer , so as to prepare a method for conducting composite fibers with high carbon nanotube content. Background technique [0002] In 1991, Dr. Iijima discovered carbon nanotubes (CNTs). Due to their unique mechanical and electrical properties, they immediately became a research hotspot in the fields of chemistry, physics and material science. [0003] However, the structure of carbon nanotubes not only endows it with excellent performance, but also determines its limitations in the application process. The surface of CNTs has large π bonds, less surface defects, and lack of active groups, making the surface neither hydrophilic nor lipophilic, and it is difficult to disperse and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/06D01F8/14D01F8/16D01F8/12D01F8/08D01F1/09D01D5/30D01D5/12
Inventor 邹黎明徐速倪建华何钧炜魏益哲刘涛
Owner DONGHUA UNIV
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