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Preparation methods of CNT (carbon nanotube) dispersing agent and CNT cement based composite material

A carbon nanotube and dispersion technology, which is applied in the directions of mixing methods, chemical instruments and methods, mixers, etc., can solve the problems that the pull-out effect of carbon nanotubes cannot be well realized, and achieves high mechanical properties and durability. The effect of enhancing dispersion

Active Publication Date: 2016-01-27
SHENZHEN UNIV
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Problems solved by technology

However, due to its extremely high elastic modulus and smooth surface, carbon nanotubes cannot completely occlude and bond with cement-based materials through deformation and friction like other fibers, and eventually the pull-out effect of carbon nanotubes cannot be very good. well realized

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  • Preparation methods of CNT (carbon nanotube) dispersing agent and CNT cement based composite material
  • Preparation methods of CNT (carbon nanotube) dispersing agent and CNT cement based composite material
  • Preparation methods of CNT (carbon nanotube) dispersing agent and CNT cement based composite material

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preparation example Construction

[0019] The preparation process of the carbon nanotube dispersion in the embodiment of the present invention first mixes a certain amount of nano silica gel and a certain amount of carbon nanotubes in a beaker, and stirs in a magnetic stirrer for 15 minutes, and then puts it into an ultrasonic dispersion device for ultrasonic dispersion .

[0020] The carbon nanotubes are multi-walled carbon nanotubes produced by the Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu. They have a small long-diameter ratio, a large specific surface area, high purity, and have -COOH groups.

[0021] Nano-silica gel is produced by Qingdao Yuminyuan Silicone Reagent Factory. It is a dispersion of nano-silica in water. The content of nano-silica is 2% to 12% by mass percentage.

[0022] Dispersion method of the present invention has following characteristics compared with other dispersion methods:

[0023] The process is simple (no need to add additional carbon nanotube dispersant...

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Abstract

The invention discloses preparation methods of a CNT (carbon nanotube) dispersing agent and a CNT cement based composite material. The preparation method of the CNT cement based composite material comprises the step as follows: 40-45 parts by mass of the CNT dispersing agent is mixed in 100 parts by mass of a cementitious material. The preparation process of the CNT dispersing agent comprises steps as follows: nano-silica gel is taken as a dispersing agent and mixed with CNTs in a container, and a mixture is stirred in a magnetic stirrer and is subjected to ultrasonic dispersion in ultrasonic dispersion equipment finally. The dispersibility of the CNTs can be enhanced through solubility of nano-silica gel particles well dispersed in the CNT dispersing agent; besides, the CNTs can be effectively prevented from agglomeration by the aid of nanoparticles attached to the surfaces of the CNTs; mechanical properties and durability of the prepared CNT cement based composite material can be improved more remarkably.

Description

[technical field] [0001] The invention relates to civil engineering, in particular to a method for preparing a carbon nanotube dispersion liquid and a carbon nanotube cement-based composite material. [Background technique] [0002] As a cement-based material, concrete is widely used in the field of construction and has become the cornerstone of building structures in today's society because of its advantages such as convenient material extraction, high economy, easy pouring, easy construction, and good fire resistance. However, concrete is a material with poor ductility and weak tensile properties. It is easy to generate additional stress under the conditions of sudden changes in load, temperature and humidity, which may lead to cracking. The development of cracks will bring some damage to the concrete material. Adverse effects include reducing the mechanical properties and durability of concrete, thereby affecting the durability of the structure and shortening the service l...

Claims

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Application Information

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IPC IPC(8): B01F3/12B01F13/10C04B28/00C04B22/02
Inventor 李伟文刘颐纪伟明邢锋
Owner SHENZHEN UNIV
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