Preparation of an insulating layer-coated carbon nanotube orientation adsorption carbon fiber prepreg

Abstract

The invention belongs to the field of composite material preparation, and in particular relates to a preparation method of an insulating layer-coated carbon nanotube orientation adsorption carbon fiber / epoxy resin prepreg, which is used for interlayer multi-scale reinforced carbon fiber composite materials. The present invention includes the following technical steps. Step I: adding carbon nanotubes to a preferred insulating coating material, and ball milling to obtain a uniform powder mixture; Step II: stirring the mixture obtained in step I in deionized water, heating to obtain carbon nanotubes coated with an insulating layer; Step Ⅲ: Spray the carbon nanotubes coated with the insulating layer evenly on the copper plate connected to the positive electrode, connect the carbon fiber prepreg to the negative electrode, apply a voltage to make the carbon nanotubes vertically oriented and adsorb to the surface of the prepreg, and control the carbon nanotube adsorption layer The thickness is 20~80μm. The invention has simple process, and the carbon nanotubes are vertically oriented on the surface of the prepreg, which can significantly improve the bending strength, compressive strength and interlayer fracture toughness of the composite material, and is easy to popularize and apply in actual production.

Description

technical field [0001] The invention belongs to the field of preparation of carbon fiber composite materials, in particular to a preparation method of an insulating layer-coated carbon nanotube orientation adsorption carbon fiber / epoxy resin prepreg. Background technique [0002] Carbon fiber reinforced resin matrix composites have a series of excellent properties such as high specific strength, high specific modulus, fatigue resistance, corrosion resistance and high dimensional stability, and are widely used in the fields of aviation, aerospace, automobiles, energy and sports equipment, especially in aviation, Applications in aerospace are increasing day by day. However, the surface of carbon fiber is inert, has few active functional groups, and has poor adhesion to the matrix, and there are a large number of defects at the interface of the composite material. Moreover, the good mechanical properties of carbon fiber composite materials are concentrated in the axial directi...

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Problems solved by technology

At present, there are two main methods for preparing vertically oriented carbon nanotube-reinforced carbon fiber composites: one method is to directly grow carbon nanotubes on the surface of carbon fibers, for example, Hu Zhihui et al. (Patent Publication No. Attached to the surface of carbon fiber to grow arrayed carbon nanotubes on the surface of carbon fiber. Although the interfacial strength of the composite material is improved, this method damages the tensile strength of the carbon fiber itself, and the process conditions are complicated. In the laboratory stage; Another method is to use chemical vapor deposition (CVD) technology to prepare carbon nanotubes arranged in arrays, such as Cui et al. (Patent Publication No. CN101348901 A) invented cyclohexane as a carbon source, and CVD Arrayed carbon nanotubes are prepared by the method, which is added to the interlayer of the composite material, and the composite material with a "sandwich" sandwich structure is prepared by molding, autoclave or resin transfer molding (RTM). The mechanical properties of the carbon nanotubes have been improved, but the disadvantage is that the arrayed carbon nanotubes prepared are limited by the template, so the area is small, and the temperature required by the CVD method needs to be higher than 600 ° C. The process is complicated and the cost is high, and it is difficult to achieve large-scale applications.