Sizing agent and carbon fiber composite material and method for producing the same

By combining low-hydroxyl-type moisture-resistant epoxy resin and epoxy-terminated acylhydrazone-PAI prepolymer, a dynamic cross-linking network is formed, which solves the problems of moisture absorption and interfacial microcracks in carbon fiber composites under humid and hot environments, and realizes the preparation of high-strength, low-water-absorption and environmentally friendly carbon fiber composites.

CN122128913APending Publication Date: 2026-06-02JIANGSU ZHONGFU SHENYING CARBON FIBER ENG CENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU ZHONGFU SHENYING CARBON FIBER ENG CENT CO LTD
Filing Date
2026-04-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing carbon fiber sizing agents are prone to causing high hygroscopicity, interfacial hydrolysis, and mechanical property degradation in composite materials under humid and hot environments. Furthermore, they fail to effectively address the problem of interfacial microcrack propagation, resulting in insufficient long-term service stability of the composite materials.

Method used

The sizing agent employs a combination of low-hydroxyl-type moisture-resistant epoxy resin, epoxy-terminated acylhydrazone-PAI prepolymer, epoxy silane-modified lignin, phytosterol polyoxyethylene ether, and dynamic crosslinking aids containing diaminourea. The acylhydrazone bonds in the sizing agent can be dynamically broken/recombined to form an interpenetrating crosslinking network, combined with a bio-derived Si-O-Si hydrophobic framework. Phytosterol polyoxyethylene ether is used as an emulsifier to replace chemically synthesized emulsifiers.

Benefits of technology

It significantly improves the moisture and heat resistance and interfacial bonding strength of composite materials, with low water absorption, high interlaminar shear strength, and high impact strength recovery rate. It is also environmentally friendly and process-compatible, reducing the storage cost of carbon fiber.

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Abstract

This invention relates to the field of carbon fiber surface treatment and composite material technology, and discloses a sizing agent and a carbon fiber composite material and its preparation method. The disclosed sizing agent, by weight parts, comprises: 25-35 parts of a low-hydroxyl-type moisture-resistant epoxy resin, 8-15 parts of an epoxy-terminated acylhydrazone-PAI prepolymer, 15-25 parts of epoxy silane-modified lignin, 6-10 parts of phytosterol polyoxyethylene ether, 2-5 parts of a diamine-containing urea dynamic crosslinking agent, and 50-60 parts of water; the low-hydroxyl-type moisture-resistant epoxy resin is selected from at least one of bisphenol S epoxy resin and bisphenol F epoxy resin. The sizing agent emulsion provided by this invention has good stability, and the carbon fiber exhibits low moisture regain after sizing; its reinforced composite material has high shear strength retention, high impact strength recovery, and low water absorption under humid and hot environments, making it suitable for extreme humid and hot environments such as aerospace and marine engineering.
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