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Method for improving anti-fatigue performance of carbon fiber composite material by introducing carbon nano tubes from interface

A carbon nanotube and composite material technology is applied in the field of fatigue resistance of carbon fiber resin-based composite materials, which can solve the problems of insignificant mechanical properties of composite materials, unfavorable resin infiltration of carbon fibers, uneven distribution of carbon nanotubes, etc. Fatigue resistance, reinforcement, agglomeration reduction

Inactive Publication Date: 2015-12-09
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of carbon nanotubes tends to increase the viscosity of the resin, which is not conducive to the infiltration of carbon fibers by the resin; and during the molding process, the carbon fibers will have a filtering effect on the carbon nanotubes in the resin, resulting in uneven distribution of carbon nanotubes. This directly leads to the insignificant improvement of the mechanical properties of the composite material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Weigh 2g of carbon nanotubes, use the mixed acid oxidation method, and then add 160ml of concentrated HNO 3 and concentrated H 2 SO 4 In a mixed acid (1:3, v / v), heat in a water bath at 70°C for 8 hours, dilute and wash with deionized water, filter through a microporous membrane, and wash repeatedly until the filtrate is neutral. The obtained solid was dried in a vacuum oven for 24 hours to obtain acidified carbon nanotubes. Carbon nanotubes are introduced into the fiber surface by electrophoretic deposition. First, pour 0.3 mg / ml carbon nanotube aqueous dispersion into the electrophoretic deposition tank, then connect the carbon fiber bundle to the positive electrode of the DC power supply, and place it between two electrode plates connected to the negative electrode. When the power switch is turned on, the negatively charged carbon nanotubes are deposited on the surface of the carbon fibers. The DC power supply voltage is 20-40V, the electrode plate dis...

Embodiment 2

[0015] Example 2: Using a microwave plasma instrument to modify carbon nanotubes, and modifying the surface with amino groups. First, put the carbon nanotubes in the plasma instrument, close the instrument, pass in hydrogen as the carrier gas, bring the precursor ammonia water flow into the plasma instrument, turn on the microwave power source, and control the power to float between 30-40W , glow irradiation produces active amino plasma, which can combine with the surface of carbon nanotubes, so that carbon nanotubes can be modified with amino groups. Due to the hydrophilicity of amino groups, the solubility of carbon nanotubes in water increases. A sizing agent containing carbon nanotubes and water-based epoxy resin is prepared with a concentration of 0.5-2mg / ml, and the carbon fiber bundles are sizing treated. Multiple treatments can be used to increase the uniformity of carbon nanotube distribution on the fiber surface.

[0016] The carbon fibers covered with carbon nanot...

Embodiment 3

[0017] Example 3: Preparation of oxidized carbon nanotubes by mixed acid oxidation method to increase their dispersibility in polar solvents. Concrete method, referring to embodiment 1. A carbon nanotube ethanol dispersion with a concentration of 0.3 mg / ml was prepared, and the carbon nanotubes were sprayed onto the surface of carbon fibers or carbon fiber cloth with a high-pressure spray gun, and then dried in a vacuum oven for 24 hours. The resin transfer molding process is used to form the composite material, the fiber bundle and the fiber cloth are laid in the mold, and then the resin is poured under the assistance of vacuum, and the composite material product is obtained after curing and molding. The fatigue life of the prepared multi-scale composite material in the pull-pull mode is 1-2 times higher than that of the composite material without introducing carbon nanotubes.

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Abstract

A method for improving the anti-fatigue performance of a carbon fiber composite material by introducing carbon nano tubes from the interface includes the concrete steps that the functional carbon nano tubes are introduced into surfaces of carbon fibers, and then a carbon nano tube-carbon fiber multiscale reinforced resin composite material is prepared through composite molding. According to the method, the carbon nano tubes are fully used for reinforcing and toughening resin matrixes in interface micro areas, a barrier for resisting formation and expansion of fatigue cracks is built on the interface to delay direct attack on the fibers by the cracks, and the fatigue service of the composite material is prolonged. Compared with a traditional fiber composite material prepared from the carbon nano tubes and resin through a blending method, the carbon nano tubes in the carbon nano tube-carbon fiber multiscale reinforced resin composite material can be evenly dispersed more easily and are small in usage amount, and the multiscale reinforced resin composite material is wide in suitable molding technology range and has the advantages of being low in cost, suitable for industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials application, and in particular relates to a method for improving the anti-fatigue performance of carbon fiber resin-based composite materials by introducing carbon nanotubes at the interface. Background technique [0002] Carbon fiber reinforced resin-based composite materials have been widely used in national economic fields such as aerospace, wind power generation, transportation, sports and entertainment due to their excellent properties such as high specific strength, high specific modulus, dimensional stability, and low density. The interface between the fiber reinforcement and the resin matrix is ​​called the "heart" of the composite material. It is the link between the external load transfer between the reinforcement and the matrix, and directly affects the interlaminar shear, fracture, impact resistance, etc. of the composite material. performance. In addition, the structure o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K7/06C08K7/24C08K9/02
Inventor 姚红伟倪亚吴腾飞徐志伟邓辉
Owner TIANJIN POLYTECHNIC UNIV