Method for preparing graphite and functional carbon fiber modified epoxy resin composite material

Abstract

The invention relates to a method for preparing a graphite and functional carbon fiber modified epoxy resin composite material. The method comprises the following steps of: performing carboxylation functionalization on a carbon nanotube; introducing diamine or polyamine into the carbon nanotube to obtain a surface-aminated carbon nanotube; reacting the aminated carbon nanotube with carboxylated carbon fiber to obtain an aminated carbon fiber of which the surface is grafted with the carbon nanotube; introducing the diamine or polyamine into the surface of the carbon fiber, so that carboxyl, which is on the surface of the carbon fiber and is not reacted with the aminated carbon nanotube completely, is aminated completely; performing prepolymerization reaction on the carbon fiber and epoxy resin to obtain a functional carbon fiber of which the surface is grafted with a reinforcement of the epoxy resin; compounding graphite with the epoxy resin to obtain a graphite modified epoxy resin matrix; and compounding the functional carbon fiber of which the surface is grafted with the reinforcement of the epoxy resin with the graphite modified epoxy resin matrix in a certain mode to obtain the required product. The carbon fiber is toughened by utilizing the strength and the toughness of the carbon nanotube, so that the adhesive properties of the carbon fiber and the resin matrix are improved, the interface adhesive intensity of the composite material is improved and the whole property of the composite material is improved; and the friction coefficient and the wear rate of the composite material are reduced by utilizing the lubricating property of the graphite.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of graphite and functionalized carbon fiber modified epoxy resin composite material. Background technique [0002] Epoxy resin is one of the three general-purpose thermosetting resins, which has excellent dielectric properties, wear resistance, mechanical properties, electrical insulation properties, chemical stability, high and low temperature resistance, and processing properties. Due to its low shrinkage, easy processing and low cost, it plays an important role in the fields of adhesives, coatings, electronics, electrical appliances, and aerospace. [0003] Carbon fiber has very excellent mechanical properties, and has good high temperature resistance, corrosion resistance, friction resistance, fatigue resistance, low thermal expansion coefficient, electrical conductivity, electromagnetic shielding, etc., and has been widely used in...

AI Technical Summary

Problems solved by technology

Due to the large surface inertia of carbon fiber, low surface energy, few chemically active functional groups, low reactivity, and poor adhesion to the matrix, there are many defects in the interface of the composite material, the interface bonding strength is low, and the interface performance of the composite material is poor. defect

In addition, the mechanical properties of carbon fiber composite materials in the vertical fiber direction are poor, which makes the interlayer strength of carbon fiber composite materials low, which affects the overall performance of carbon fiber composite materials and limits the application of materials in the aerospace field.

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