Carbon fiber sizing agent as well as preparation method and application thereof

By preparing a carbon fiber sizing agent composed of epoxy resin and additives, the problems of difficult concentration control, insufficient bonding force and poor compatibility in the existing technology were solved, and a good bond between the sizing agent and carbon fiber and resin matrix was achieved, thereby improving the performance of the composite material.

CN122039436APending Publication Date: 2026-05-15ZHEJIANG BORIS COMPOSITE MATERIALS CO LTD
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Patent Information

Application Number
CN202610373452.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-25
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing carbon fiber sizing agents suffer from problems such as difficulty in controlling concentration, insufficient bonding force with carbon fiber surface, and poor compatibility with resin matrix, which affect the performance of composite materials.

Method used

A carbon fiber sizing agent composed of epoxy resin and additives, including toughening agents, impregnating agents, softeners, hygroscopic agents and emulsifiers, is prepared through mixing, emulsification and curing steps to form a uniform emulsion, which improves the bonding force with carbon fiber and resin matrix.

Benefits of technology

This method enables controllability of sizing agent concentration, enhances the interfacial bonding between carbon fiber and resin matrix, and improves the interlaminar shear strength and interfacial bonding of composite materials.

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Abstract

The invention discloses a carbon fiber sizing agent and a preparation method and application thereof, particularly relates to the technical field of carbon fiber sizing agents, and is characterized in that the carbon fiber sizing agent is prepared from epoxy resin and auxiliaries, the epoxy resin is at least one of bisphenol A epoxy resin or phenolic aldehyde modified epoxy resin, and the auxiliaries are epoxy resin. The auxiliaries comprise a flexibilizer, a soaking agent, a softening agent, a moisture absorbent and an emulsifier, the flexibilizer is one or more of polyether polyol or hydroxyl-terminated polybutadiene, the soaking agent is a nonionic surfactant, the softening agent is one or more of fatty acid ester or fatty acid amide, and the moisture absorbent is one or more of polyisobutylene or polyisobutylene. The moisture absorbent is one or more of glycerol or sorbitol, the emulsifier is a nonionic surfactant, the concentration of the sizing agent is easy to control, the binding force between the sizing agent and the carbon fiber surface is strong, and the compatibility between the sizing agent and a resin matrix is good.
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