Water-borne sizing agent for carbon fiber and preparation method and sizing method thereof

Abstract

The invention discloses a water-borne sizing agent for carbon fiber. The water-borne sizing agent is prepared from 5-10% of epoxy resin modifier, 10-25% of epoxy resin, 65-80% of deionized water and 1-5% of auxiliary. The invention further provides a preparation method of the water-borne sizing agent for the carbon fiber. According to the preparation method, a certain amount of epoxy resin and modifier are taken and subjected to reaction for 1-3 hours to prepare anionic modified epoxy resin, and then a certain amount of deionized water is dripped and other auxiliaries are added to prepare the anionic water-borne epoxy sizing agent for the carbon fiber. The invention further provides a sizing method of the water-borne sizing agent for the carbon fiber. According to the epoxy carbon fiber sizing agent, the emulsion particle diameter is small, particle diameter distribution is narrow, and stability is high; through strict control over reaction conditions, when the carbon fiber subjected to sizing is used for preparing a PA6 (nylon 6) composite material, the adhesion force at the interface between the carbon fiber and resin is enhanced, wear resistance is improved, and tensile strength, bending strength and other properties are greatly improved.

Description

technical field [0001] The invention relates to the field of fiber manufacturing, in particular to a carbon fiber water-based sizing agent and a preparation method and a sizing method thereof. Background technique [0002] Carbon fiber has many excellent properties, such as low density, high strength, high modulus, fatigue resistance, wear resistance, low electrical resistivity, low thermal expansion coefficient, high thermal conductivity, high temperature resistance, chemical corrosion resistance, and good biocompatibility , good conductivity, good ray transmittance, good post-processing, large design freedom, etc., are widely used in transportation, civil engineering, electrical instruments, energy, medical equipment, cultural and sports equipment, etc., especially in cutting-edge technologies such as aerospace In the field, the use of carbon fiber and its composite materials has solved many technically critical problems. [0003] However, the elongation of carbon fiber i...

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Problems solved by technology

[0006] Carbon fiber sizing agents have been developed in China for decades, mainly in the field of carbon fiber reinforced epoxy resins. Most of the systems used are epoxy resins and organic solvents. For example, the patent CN103451951A mentioned that carbon fiber sizing agents were prepared using acetone as a solvent. CN103628323A mentions that trichlorethylene is used as a solvent, but this method has the defects that the organic solvent is volatile and the resin is easy to remain on the guide roller.

Patent CN101858037A prepares a water-based carbon fiber sizing agent, the prepared emulsion particle size is too large, and the interface between the sized carbon fiber and the resin is not well bonded

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