Interface modified carbon fiber/polypropylene composite material and preparation method thereof

Abstract

The invention discloses an interface enhanced modification method of a carbon fiber composite material. Specifically, the method comprises the steps of grafting polyphosphazene on the surface of carbon fiber to obtain modified carbon fiber with a large number of amino groups on the surface, and further performing chemical grafting reaction on graphene and aminated carbon fiber. By grafting a series of graphene with different densities on the surface of the carbon fiber, the roughness and specific surface area of the surface of the carbon fiber can be effectively increased, the interface mechanical engagement effect between the carbon fiber and a resin matrix is enhanced, and active groups on the surface of the graphene can further form chemical bonds with the resin matrix, so that the interface bonding strength of the carbon fiber and resin matrix composite material is significantly improved. The invention further provides the carbon fiber prepared on the basis of the method, the composite material prepared by using the carbon fiber, and a product prepared by using the composite material.

Description

technical field [0001] The invention belongs to the field of interface modification of composite materials, and more specifically relates to a method for preparing an interface-reinforced carbon fiber / polypropylene composite material. Background technique [0002] At present, the commonly used carbon fiber reinforced resin-based composite materials are still mainly thermosetting resins, especially sheet molding compounds are widely used in the manufacture of auto parts. However, with the decrease of fossil energy and the increasing awareness of human environmental protection, energy conservation and emission reduction has become the goal of the common efforts of the whole world. In the past two decades, due to the rapid development of the automobile industry and the rapid expansion of the application of composite materials in the field of automotive materials, the problem of volatilization of harmful gases and waste recycling of thermosetting composite materials has become p...

AI Technical Summary

Problems solved by technology

However, the surface of carbon fiber is inert, the surface energy is low, and there are few functional groups with chemical activity, and polypropylene is a non-polar polymer, which leads to poor wettability between carbon fiber and polypropylene resin, and it is also difficult to form chemical bonds between the two. Therefore, the composite material interface is easy to form defects, and the interface bonding strength is low, which directly affects the stress transfer and dispersion between the composite material fiber and the matrix, so the high performance of carbon fiber cannot be fully exerted.

[0004] In order to improve the interfacial properties of carbon fiber-reinforced resin-based composites, surface modification of carbon fibers is required, and traditional methods such as oxidation treatment, high-energy rays, laser, coupling agent treatment, and plasma treatment can increase the surface polar groups of carbon fibers. Quantity, which helps to improve the interfacial bonding strength between carbon fiber and polar resin matrix, but the above method is not suitable for improving the interfacial bonding between non-polar polypropylene and carbon fiber

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