Preparation of carbon fiber/epoxy resin prepreg sprayed with aminated carbon nanotubes

Abstract

The invention belongs to the field of preparation of composite materials, and particularly relates to a preparing method of a carbon fiber prepreg sprayed with carbon nanotubes in an electrostatic manner. The method is characterized in that: the surface of a carbon fiber / epoxy resin prepreg is rapidly sprayed with the amino-grafted carbon nanotubes by adoption of an electrostatic spraying technology, thus obviously improving compression strength and modulus and interlaminar shear strength of a carbon fiber composite material. The method comprises following technical steps of: I) grinding the amino-grafted carbon nanotubes and a preferred electrostatic spraying agent in a ball mill according to a certain ratio to obtain a uniform and stable suspension; II) putting the suspension obtained in the step I) into an electrostatic spraying device, and uniformly spraying the surface of the carbon fiber / epoxy resin prepreg with the carbon nanotubes; and III) controlling the thickness of a carbon nanotube coating on the surface of the carbon fiber prepreg to be 10-80 [mu]m. The interlaminar content of the carbon nanotubes in the composite material is controllable. A processing process of the composite material is not influenced. The method is simple and convenient in operation and prone to popularization and application in practical 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 amino-grafted carbon nanotube electrostatically sprayed carbon fiber / epoxy resin unidirectional prepreg or fabric prepreg. Background technique [0002] Carbon fiber / epoxy resin composites have a series of excellent properties such as high strength, high modulus, low density, and dimensional stability, and have been widely used in aerospace, energy transportation, sports equipment, and military industries. However, the current carbon fiber / epoxy resin composites still have problems such as easy delamination between layers, poor impact resistance, and low mechanical properties perpendicular to the fiber direction, which make it difficult to meet the application requirements of some advanced composite materials. These properties are mainly affected by the interface properties between the resin matrix and carbon fibers. Improving...

AI Technical Summary

Problems solved by technology

The published patents US8187703 B2 and CN102140230 A use mechanical stirring to blend functionalized carbon nanotubes with epoxy resin to improve the performance of composite materials by strengthening the resin matrix. The effect of material interface properties is not obvious

Although there have been reports on the use of thermoplastic polymer fibers containing carbon nanotubes to reinforce and toughen carbon fiber composites, for example, the disclosed patent CN102794952 A uses the fiber film containing oriented carbon nanotubes prepared by electrospinning to strengthen and toughen Carbon fiber composites can improve the bending strength, modulus and interlaminar fracture toughness of composite materials. However, the preparation process of polymer fibers is relatively complicated, and the amount of carbon nanotubes added is limited, making it difficult to achieve large-scale applications.

However, growing carbon nanotubes directly on the surface of carbon fibers to improve their interfacial properties is also unable to achieve industrial applications due to high preparation costs and low yields.