Carbon fiber grafting modification method and grafting modified carbon fiber

By employing a multi-step modification method involving Michaelis activation, polyethyleneimine grafting, and amidation, the problem of insufficient interfacial bonding between carbon fibers and thermoplastic resins was solved, achieving efficient improvement in interfacial bonding strength and enhanced composite material performance.

CN122446528APending Publication Date: 2026-07-24CHINESE TEXTILE ACAD
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Patent Information

Application Number
CN202510117701.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The interfacial bonding performance between existing carbon fibers and thermoplastic resins is insufficient, leading to a decline in the mechanical properties of composite materials. Traditional modification methods are complex, time-consuming, and result in uneven modification.

Method used

The surface of carbon fibers is activated by Michaelis-Müller acid to introduce active groups such as carboxyl and hydroxyl groups, which are then grafted with polyethyleneimine. Finally, acyl chloride is modified to form stable amide bonds to enhance interfacial bonding.

Benefits of technology

It significantly improves the interfacial bonding force between carbon fiber and thermoplastic resin, enhances the mechanical properties and durability of composite materials, makes them suitable for continuous production, and reduces energy consumption and costs.

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Abstract

The application discloses a carbon fiber grafting modification method and grafting modified carbon fiber, and the grafting modification method comprises the following steps: (1) performing desizing treatment on the carbon fiber; (2) activating the surface of the desized carbon fiber by using Michler's acid; and (3) performing grafting reaction on the activated carbon fiber and polyethylene imine. The application discards the complicated equipment requirement and high-time reaction condition in the traditional modification method, simplifies the operation steps while realizing efficient surface modification, is suitable for continuous production, reduces energy consumption and cost, and improves the feasibility of industrial application. The surface of the carbon fiber modified by the method of the application has significantly enhanced interface bonding force with the thermoplastic resin, stress transmission between the fiber and the resin is more efficient, and therefore the overall mechanical property of the carbon fiber reinforced composite material is improved, which provides new possibility for the application of the carbon fiber reinforced composite material in the high-performance structure field.
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