A rosin acid anhydride modified curing agent, a preparation method thereof and application thereof in epoxy resin-based composite materials

By introducing functional groups into the rosin anhydride molecule through chemical modification, the problems of poor compatibility and interfacial bonding of rosin anhydride were solved, and the high performance of epoxy resin-based composite materials was achieved, making them suitable for high-end fields.

CN122380967APending Publication Date: 2026-07-14BEIJING COMPOSITE MATERIALS CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING COMPOSITE MATERIALS CO LTD
Filing Date
2026-03-16
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Traditional anhydride curing agents are unsustainable, and rosin anhydrides have poor compatibility and interfacial bonding when used directly, resulting in insufficient interfacial properties of epoxy resin-based composites and limiting their application in high-end fields.

Method used

Rosin anhydride-modified curing agents are prepared by introducing hydroxyl, amino, or epoxy functional groups into the molecular structure of rosin anhydride, thereby enhancing its compatibility with epoxy resin and its interfacial bonding with the reinforcing phase.

Benefits of technology

It significantly improves the interfacial bonding performance and mechanical properties of composite materials. The modified curing agent is widely available and inexpensive, making it suitable for industrial production and application in the field of high-end composite materials.

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Abstract

The application discloses a rosin acid anhydride modified curing agent, a preparation method thereof and application of the curing agent in an epoxy resin-based composite material. The rosin acid anhydride modified curing agent is prepared by adding a functional group containing a hydroxyl group, an amino group or an epoxy group into a rosin acid anhydride molecular structure through addition reaction of the rosin acid anhydride and an active modifier; an epoxy resin mixed system is obtained by uniformly mixing an epoxy resin, the rosin acid anhydride modified curing agent and an accelerator; then, a reinforcing phase is added into the epoxy resin mixed system, and an epoxy resin-based composite material is obtained through pre-impregnation and sectional curing molding. The modified curing agent is environment-friendly and has good compatibility with the epoxy resin, and when the modified curing agent is used for curing the epoxy resin, the interface bonding performance of the composite material can be significantly enhanced, and the mechanical performance and heat resistance of a cured product are improved.
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