An aqueous sizing agent for carbon fibers and use thereof

By compounding a sulfonated polyarylene ether aqueous sizing agent with low and high glass transition temperatures, the problem of poor compatibility between traditional sizing agents and polyarylene ether ketone resins was solved, achieving full wetting and mechanical interlocking between carbon fibers and matrix resins, thereby improving the strength and thermal stability of the composite material.

CN117988116BActive Publication Date: 2026-06-23DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202410098994.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-24
Publication Date
2026-06-23
Estimated Expiration
2044-01-24

AI Technical Summary

Technical Problem

In the prior art, traditional epoxy resin sizing agents have poor structural compatibility with polyaryletherketone resins, resulting in incomplete wetting of carbon fibers and matrix resins, weak interfacial bonding, and easy thermal degradation of the sizing agent, which affects the performance of composite materials.

Method used

A water-based sizing agent is prepared by combining sulfonated polyarylene ethers with low glass transition temperatures and sulfonated polyarylene ethers with high glass transition temperatures. This forms hydrophilic microparticles that accumulate on the carbon fiber surface, providing different wetting behaviors, forming a mechanically interlocked structure, and enhancing interfacial bonding.

Benefits of technology

It improves the interfacial properties of carbon fiber and polyetheretherketone composites, ensures full wetting of the matrix resin, enhances the interlaminar shear strength and flexural strength of the composites, and also has good environmental friendliness and thermal stability.

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Abstract

The present application provides a kind of sizing agent for aqueous carbon fiber and its application, belong to fiber sizing agent technical field, according to the total mass is 100 parts, sizing agent includes: component 1: sulfonated polyarylether A 0.1-15 parts, component 2: sulfonated polyarylether B 0.1-10 parts, deionized water 75~99.8 parts, wherein the glass transition temperature of component 2 is higher than that of component 1.Sulfonated polyarylether A, sulfonated polyarylether B can be self-emulsified in water to form hydrophilic microparticles, which can be adsorbed on the surface of carbon fiber, and the two microparticles are stacked on the surface of carbon fiber to form a sizing agent layer after sizing.The sizing agent can also contain a small amount of non-ionic emulsifier;Or, mixed with general anionic, non-ionic sizing agent, improve wear resistance, temperature resistance and other properties.The sizing agent provided by the present application has the characteristics of water-soluble, heat-resistant, wear-resistant, good biocompatibility and the like.Using the sizing agent can form a mechanical interlocking structure in the fiber / matrix resin interface layer, thereby effectively improving the performance of fiber reinforced polyarylether composite material.
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