Reactive core-shell nano toughening agent for epoxy resin as well as preparation method and application of reactive core-shell nano toughening agent

By designing a three-layer reactive core-shell nano-toughening agent for epoxy resin, the problem of poor compatibility between epoxy resin toughening agent and matrix is ​​solved, achieving a synergistic improvement in toughness and stiffness. The preparation method is simple and environmentally friendly, and it is suitable for aerospace, electronics and electrical fields.

CN122145723APending Publication Date: 2026-06-05HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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Patent Information

Application Number
CN202610517721.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-20
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing epoxy resin toughening agents have poor compatibility with the matrix, uneven dispersion, and low toughening efficiency. After toughening, the mechanical properties of the matrix deteriorate, the core-shell interface bonding strength is insufficient, and it is difficult to achieve a balance between rigidity and toughness.

Method used

A three-layer reactive core-shell nano-toughening agent for epoxy resin is prepared by seed emulsion polymerization. The core is rubber, the outer shell is a reactive cross-linked copolymer, and the interface has a physically entangled transition layer of controllable thickness. The particle size is ensured to be 80-300 nm. The outer shell is well compatible with the epoxy resin matrix, and the core and outer shell have synergistic properties to enhance the interfacial bonding force.

Benefits of technology

It significantly improves the toughness and impact resistance of epoxy resin while maintaining stiffness and strength, expanding its application range in high-end engineering fields. The process is simple, environmentally friendly, and has a high product yield.

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Abstract

The invention provides preparation and application of a reactive core-shell nano toughening agent for epoxy resin. The reactive core-shell nano toughening agent has a core-shell three-layer structure, the core is introduced by rubber (butyronitrile, butylbenzene and polybutadiene) emulsion containing butadiene chain segments, the shell is a cross-linked copolymer obtained by copolymerization of a vinyl monomer, a reactive monomer and a cross-linking agent, and an interface transition layer with controllable thickness is arranged between core-shell interfaces. The provided reactive core-shell nano toughening agent forms a uniform chain segment physical entangled transition layer through a pre-dispersion process, and the thickness of the transition layer is regulated and controlled by monomer polarity and pre-dispersion time, so that core-shell interfaces are combined through intermolecular interaction, the interface stress conduction efficiency is enhanced, and the toughening effect on epoxy resin is improved. When the provided reactive core-shell nano toughening agent is applied to toughening of epoxy resin, a reactive functional group provided by a reactive monomer in a shell structure can chemically react with an epoxy group or a curing agent in an epoxy resin matrix to form a strong covalent bonding interface; the stability and the compatibility of the toughening agent in an epoxy resin matrix are synergistically improved. By improving the internal interface of the core-shell toughening agent and the interaction between the core-shell toughening agent and the interface of an epoxy matrix, the technical problems that the existing core-shell toughening agent is poor in compatibility with the epoxy resin, low in toughening efficiency and poor in mechanical property of the toughened matrix can be effectively solved, and the application range of the epoxy resin in the field of high-end engineering can be expanded.
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