Method for efficiently dispersing carbon nano-tubes

A technology of carbon nanotubes and nanotubes, which is applied in the field of preparation of carbon nanotube dispersions, can solve the problems of easy aggregation of carbon nanotubes, low dispersion concentration, poor electrical and thermal conductivity, and other problems, so as to overcome anisotropy and improve Mechanics, Effects on Solving Agglomeration and Stacking Problems

Active Publication Date: 2018-09-28
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0008] The present invention mainly solves the problems of easy agglomeration of carbon nanotubes in the existing carbon nanotube dispersion liquid, low dispersion concentration, poor stability, and poor electrical and thermal conduction mechanical properties, and provides a method that does not require surfactants and does not reduce carbon nanotubes. Excellent electrical and thermal conductivity and mechanical properties, a method that can efficiently disperse carbon nanotubes

Method used

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  • Method for efficiently dispersing carbon nano-tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In terms of mass fraction, 1 part of multi-walled carbon nanotube (CNT-E3010, Zhongshan Carnet Plastic Co., Ltd.), 0.5 part of carboxylated carbon nanotube (carboxyl molar content is 1%, XF022, Nanjing Xianfeng Nano Material Technology Co., Ltd. Co., Ltd.), 120 parts of water were mixed evenly, and the pH was adjusted to 8 with aqueous sodium bicarbonate solution, and a stable dispersed carbon nanotube dispersion was obtained after ultrasonic dispersion for 1 hour in an ultrasonic cleaning machine with a power of 100W.

[0037] figure 1 In order to use scanning electron microscopy (FE-SEM, SU-8200, Japan) to obtain the microcosmic dispersion state of the dispersion (stable dispersed carbon nanotube dispersion) of functional carbon nanotube dispersed carbon nanotube in embodiment 1, the high-magnification scanning of characterizing Electron microscope picture. It can be seen from the figure that carbon nanotubes can basically form a single-layer dispersed state, but the...

Embodiment 2

[0044] In terms of mass fraction, 2 parts of multi-walled carbon nanotubes (CNT-E3010, Zhongshan Carnet Plastic Co., Ltd.), 2 parts of hydroxylated carbon nanotubes (the molar content of hydroxyl is 1.5%) (XF021, Nanjing Xianfeng Nanomaterials Co., Ltd. Technology Co., Ltd.) and 800 parts of acetone were mixed evenly, and the pH was adjusted to 8 with aqueous sodium bicarbonate solution, and a stable dispersed carbon nanotube dispersion was obtained after ultrasonic dispersion in an ultrasonic cleaning machine with a power of 100W for 1 hour.

[0045] The apparent color of the obtained carbon nanotube dispersion was dark black, and the concentration was 5 g / L. After measurement, the Zeta potential of the dispersion was -60.8mV, and the hydrated particle size was 583.2nm. No precipitation was found in a centrifuge at 5000r / min for 15 minutes, which proved that the carbon nanotube aqueous dispersion was stable.

[0046] In the present invention, the E44 epoxy resin and the obtai...

Embodiment 3

[0048] In terms of mass fraction, 1 part of single-walled carbon nanotubes (CNT-E3010, Zhongshan Carnet Plastic Co., Ltd.), 0.2 parts of hydroxylated carbon nanotubes (the molar content of hydroxyl is 1.5%) (XF021, Nanjing Xianfeng Nanomaterials Co., Ltd. Technology Co., Ltd.) and 500 parts of ethanol were mixed evenly, and the pH was adjusted to 9 with aqueous sodium hydroxide solution, and a stable dispersed carbon nanotube dispersion was obtained after ultrasonic dispersion for 3 hours in an ultrasonic cleaning machine with a power of 100W.

[0049] The apparent color of the obtained carbon nanotube dispersion was dark black, and the concentration was 0.24 g / L. After measurement, the Zeta potential of the dispersion was -48.8mV, and the hydrated particle size was 600.2nm. No precipitation was found in a centrifuge at 5000r / min for 15 minutes, which proved that the carbon nanotube aqueous dispersion was stable.

[0050] In the present invention, the E44 epoxy resin and the o...

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Abstract

The invention discloses a method for efficiently dispersing carbon nano-tubes. The method comprises the steps: mixing the ingredients in parts by mass: 1-30 parts of carbon nano-tubes, 0.2-10 parts offunctionalized carbon nano-tubes and 400-1,200 parts of solvent, and adjusting the pH to 5 to 9; and carrying out ultrasonic dispersion, thereby obtaining a stable-dispersed carbon nano-tube dispersion, wherein the functionalized carbon nano-tubes are one or more of carboxylated carbon nano-tubes, hydroxylated carbon nano-tubes, aminated carbon nano-tubes, acylated-chlorinated carbon nano-tubes and sulfonated carbon nano-tubes. The method disclosed by the invention has the characteristics that the carbon nano-tube dispersion effect is good, the stability is high, the dispersion concentrationis high, the carbon nano-tubes are not destroyed and sheared, the surfactant is absent, the process flow and production cycle are short, and industrial production is easy to achieve; and the obtaineddispersion can be applied to the aspects of organic-inorganic nanocomposite materials such as heat-conducting coating materials, conducting polymers and supercapacitors.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube dispersion liquid, in particular to a method for dispersing a carbon nanotube in a Pickering emulsion. Background technique [0002] The axial dimension of carbon nanotubes is generally micron-scale, while the radial dimension can reach nanoscale. Using its large aspect ratio, it can be made into carbon fibers with excellent toughness and anisotropic heat-conducting materials; carbon nanotubes are unique The hollow structure of carbon nanotubes makes it an ideal catalyst support material and hydrogen storage material. Therefore, carbon nanotube-reinforced composites have become an important field in material research. [0003] However, due to the strong van der Waals force between carbon nanotubes, they are easily entangled or agglomerated into bundles, thus restricting the application of carbon nanotubes. In order to disperse carbon nanotubes better, some physical and chemical methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/174
CPCC01B32/174C08K2201/014C09D5/24C09K5/14C08K3/041C09D7/62C09D7/70H01B1/04C01B2202/02C01B2202/04C01B2202/06C01B2202/22C01B2202/24C01B2202/34C01B2202/36C01P2002/54C08K9/04C08K2201/001C08K2201/003C08K2201/004C08K2201/011C09D5/00C01B32/159
Inventor 张心亚黄浩炜杜芷晴余晓景李文愿黄晓凤
Owner SOUTH CHINA UNIV OF TECH
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