Nano modified composite material and preparation method and application thereof

A composite material and nano-modification technology, applied in the field of nano-modified composite materials and their preparation, and nano-composite materials, can solve problems such as difficulty in removing and recycling organic solvents, damage to carbon nanotube structures, and threats to operator safety. The experimental conditions are not harsh, the repeatability is strong, and the process is safe and reliable.

Active Publication Date: 2021-08-13
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent still needs to use a large amount of strong acid. In addition, it needs to be heated for a long time and blown with nitrogen during the extraction, which makes the operation complicated.
[0005] At present, although there are many ways to modify carbon nanotube resins in the industry, most of the experiments need to use strong acid to modify the surface of carbon nanotubes or use organic solvents to mix with resin matrix to reduce the dispersion viscosity. The nanotube structure causes uncontrollable damage, most organic solvents have certain toxicity, harsh experimental conditions will also threaten the safety of operators, and the waste liquid produced in the experiment will also cause certain pollution to the environment great difficulty

Method used

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Examples

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Effect test

preparation example Construction

[0021] A method for preparing a nano-modified composite material provided by an aspect of the embodiments of the present invention includes:

[0022] The carbon nanotubes are pre-dispersed with a dispersant to obtain a uniformly dispersed carbon nanotube dispersion, in which the dispersant is evenly distributed and coated on the surface of the carbon nanotubes. The dispersant includes but is not limited to polyvinylpyrrolidone, dodeca Any one or a combination of two or more of sodium alkylbenzenesulfonate, sodium dodecylsulfonate, methylcellulose, sodium cholate, etc.;

[0023] removing the moisture in the carbon nanotube dispersion, and then subjecting the obtained dried carbon nanotubes to high temperature treatment to remove the dispersant on the surface of the carbon nanotubes to obtain pre-dispersed carbon nanotubes;

[0024] And, uniformly mix the pre-dispersed carbon nanotubes with the resin to obtain the nano-modified composite material.

[0025] In some embodiments, ...

Embodiment 1

[0046] Add a mixture of carbon nanotubes (CNTs) and polyvinylpyrrolidone with a mass ratio of 1:0.5 into 500ml of water, and disperse homogeneously under high pressure for 10 minutes at a pressure of 100 bar to obtain uniformly dispersed CNTs with a carbon nanotube concentration of 0.01wt%. liquid. Then the resulting CNT dispersion was freeze-dried at -10 °C for 12 h, and then inert gas N at 600 °C 2 High temperature treatment under protective gas for 3 hours to obtain pre-dispersed carbon nanotubes. Finally, 0.1 g of CNT was uniformly mixed with 100 g of epoxy resin using a three-roller disperser to obtain a CNT-modified resin with a content of 0.1 wt % (that is, a nano-modified composite material). The viscosity of the CNT modified resin is 0.6Pa·s, the tensile strength is 61MPa, the tensile modulus is 2.8Gpa, the flexural strength is 103MPa, and the flexural modulus is 2.8Gpa.

Embodiment 2

[0048] Add a mixture of carbon nanotubes (CNTs) and sodium dodecylsulfonate with a mass ratio of 1:10 into 500ml of water, and disperse homogeneously under high pressure for 60min at a pressure of 800bar to obtain uniform dispersions with a carbon nanotube concentration of 5wt%. CNT dispersions. Then the resulting CNT dispersion was freeze-dried at -60°C for 72h, and then inert gas Ar at 600°C 2 High temperature treatment under protective gas for 3 hours to obtain pre-dispersed carbon nanotubes. Finally, 5 g of CNT and 100 g of epoxy resin were uniformly mixed by ultrasonication and stirring to obtain a CNT-modified resin with a content of 5 wt % (that is, a nano-modified composite material). The viscosity of the CNT modified resin is 3 Pa·s.

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Abstract

The invention discloses a nano modified composite material and a preparation method and application thereof. The preparation method comprises the following steps of: pre-dispersing carbon nanotubes by using a dispersing agent to obtain a uniformly dispersed carbon nanotube dispersion liquid, the dispersing agent being uniformly distributed and coating the surfaces of the carbon nanotubes; removing moisture in the carbon nanotube dispersion liquid, then carrying out high-temperature treatment on the obtained dried carbon nanotubes, and removing the dispersing agent on the surfaces of the carbon nanotubes to obtain pre-dispersed carbon nanotubes; and uniformly mixing the pre-dispersed carbon nanotubes with resin to obtain the nano-modified composite material. According to the preparation method, use of strong acid and organic solvents is avoided in the whole dispersion process, the dispersing agent is used in the pre-dispersion stage and is easy to remove, experimental conditions are simple and easy to operate, environmental pollution is avoided, the viscosity of the resin dispersion is greatly reduced under the same content of the pre-dispersed carbon nanotubes, and the processing manufacturability is greatly improved. The method can be widely applied to composite material preparation and other fields.

Description

technical field [0001] The invention relates to a nano-composite material, in particular to a nano-modified composite material, a preparation method thereof, and an application thereof, belonging to the technical field of nano-carbon composite materials. Background technique [0002] Since 1991, Iijima, a Japanese electron microscope scientist, used the arc method to prepare C 60 Since carbon nanotubes (CNTs) were observed in the process (Iijima S.HELICAL MICROTUBULES OF GRAPHITIC CARBON[J].Nature,1991,354(6348):56-58.), due to its unique structure and excellent performance It has attracted the attention of experts in many research fields, and has a wide range of applications in materials such as aviation and aerospace vehicles, capacitors, composite materials, and biosensors. Carbon nanotubes have a large specific surface area and a large aspect ratio, but there is a strong van der Waals force between carbon nanotubes, which makes carbon nanotubes very easy to agglomerate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L101/00C08L79/08C08L39/06C08L1/28C08K3/04C08K5/42C08K5/098
CPCC08L63/00C08L79/085C08K3/041C08K5/42C08K5/098C08K2201/011C08L39/06C08L1/28C08L101/00
Inventor 吕卫帮刘婉玥曲抒旋杨文刚
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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