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Preparation method of carbon nano tube/carbon fiber multi-dimension mixing composite material

A composite material and carbon nanotube technology, which is used in the preparation of composite materials and the preparation of carbon nanotube/carbon fiber multi-scale hybrid composite materials, can solve the problems of low viscosity, increased viscosity of resin system, and difficult to uniformly disperse, etc. The effect of improved impact resistance, improved interlaminar shear strength, and broad application prospects

Inactive Publication Date: 2008-10-15
SHENYANG INST OF AERONAUTICAL ENG +1
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Problems solved by technology

The common problems now are: (1) carbon nanotubes have a high tendency to agglomerate, which makes it difficult to form a uniform dispersion in the resin system, thus limiting their full performance; (2) the LCM process requires that the resin system must have relatively Low viscosity, and the introduction of carbon nanotubes will inevitably cause the viscosity of the resin system to increase, which is not conducive to infiltration and mold filling during the LCM process
However, the patent does not mention how to solve the crucial problem for the application of carbon nanotubes, that is, when the carbon nanotubes and carbon fibers undergo chemical reactions, the carbon nanotubes will form agglomerates, thus affecting the carbon nanotubes in the resin matrix. Uniform dispersion and performance

Method used

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  • Preparation method of carbon nano tube/carbon fiber multi-dimension mixing composite material

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preparation example Construction

[0021] Preparation method of the present invention:

[0022] 1. Put the nanocomposite fiber preform into the pre-prepared mold.

[0023] 2. Put the mold in the ultrasonic field and electric field.

[0024] 3. Carry out mold filling and curing according to the LCM process, that is, multi-scale hybrid composite materials.

specific Embodiment approach 1

[0025] One specific embodiment: (1) put the nanocomposite fiber preform into the RTM mold; (2) put the mold into the electric field and the ultrasonic field, the DC voltage is 100V, the ultrasonic power is 100W, and the ultrasonic frequency is 45KHz; (3) ) Inject the stoichiometric epoxy / anhydride system into the mold with vacuum assistance; (4) After filling the mold, cure according to the curing system 130°C / 2h+150°C / 2h+180°C / 1h+200°C / 3h (5) Naturally cool to room temperature after the curing is completed, and the carbon nanotube / carbon fiber multi-scale hybrid composite material can be obtained after demoulding.

[0026] The interlaminar shear strength of the prepared carbon nanotube / carbon fiber multi-scale hybrid composite is increased by 80%, the impact resistance is increased by 20%, and the electrical conductivity in the direction of the electric field is also increased by three orders of magnitude.

specific Embodiment approach 2

[0027] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: after the mold filling is completed, continue to process in the ultrasonic field and electric field for 0.5h. Other steps and parameters are the same as those in Embodiment 1. The interlaminar shear strength of the prepared carbon nanotube / carbon fiber multi-scale hybrid composite material is increased by 87%, and the impact resistance performance is increased by 22%.

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Abstract

The invention relates to a method for preparing a carbon nanometer tube / carbon fiber multi-scale mixed composite material. The invention is technically characterized in that the method adopts the ultrasonic assistant electrochemical deposition manner to prepare a nanometer composite fiber prefabricated part; and then under the double-action of ultrasonic and direct current field, molding is carried out according to the composite material liquid molding process (LCM), such as resin transfer molding (RTM) and resin film infusion (RFI), and the carbon nanometer tubes are dispersed and oriented along the electric field direction, thereby obtaining the multi-scale mixed composite material. The power of the ultrasonic is 100-400W and the frequency is 20-80KHz; the electric field is a direct current field with the voltage of 20-1200V. The method combines the high performance of the carbon nanometer tube with the characteristics of low cost and high performance of the traditional composite material liquid molding process, thereby realizing the complementary and reinforced advantages; the obtained composite material effectively utilizes the characteristics of the carbon nanometer tube, and can be used as the structural and functional material.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a carbon nanotube / carbon fiber multi-scale hybrid composite material, and belongs to the technical field of polymer-based composite material manufacturing. Background technique [0002] Liquid molding (LCM, including resin transfer molding (RTM) and resin film infiltration (RFI)), as an advanced composite molding process, is characterized by low cost, fast molding speed, good product quality, and little environmental pollution. The advantages and advanced technological forms have attracted widespread attention at home and abroad. However, it is an indisputable fact that the actual strength of LCM formed composites is lower than the theoretical strength. Using three-dimensional fabrics as LCM process preforms, although the integrity of the material structure and performance is good, but it imposes strict requirements on the viscosity of the res...

Claims

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Application Information

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IPC IPC(8): B29C70/68B29K101/00B29K707/04
Inventor 王柏臣马克明陈平金保宏于祺
Owner SHENYANG INST OF AERONAUTICAL ENG
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