Emulsion carbon fiber sizing agent as well as preparation method and application of sizing agent

Abstract

The invention discloses an emulsion carbon fiber sizing agent and a preparation method and application of the sizing agent. The sizing agent comprises the following components by weight percent: 2-50% of epoxy resins, 35-97% of water, 0.5-15% of surfactants and 0.1-2.0% of inorganic ammonium salt. The emulsion carbon fiber sizing agent contains the stabilizing agent inorganic ammonium salt, so the storage stability of the sizing agent is greatly improved compared with the existing sizing agents; the emulsion can still maintain the stable property and layering and uneven concentration distribution can be avoided after the sizing agent is stored for more than three years under normal temperature; after the carbon fiber sized with the sizing agent has been stored for five years under normal temperature, the mass percentage of the sizing agent on the surface of the carbon fiber is not changed; when the sizing agent is used, stirring can be carried out at 200r / min to convey and dilute the sizing agent so that the sizing agent can not generate layering and demulsification; the interlaminar shear strength of carbon fiber composites made of the carbon fibers sized with the sizing agent is enhanced by more than 10% compared with the existing carbon fiber composites; and the mechanical properties of the carbon fiber composites are not obviously changed after the carbon fiber composites are stored for two years under normal temperature.

Description

technical field [0001] The invention belongs to the field of carbon fiber production, and in particular relates to an emulsion type carbon fiber sizing agent and its preparation method and application. Background technique [0002] In carbon fiber reinforced composite materials, a sizing agent is used as a transition layer between the reinforced carbon fiber and the matrix resin. The sizing agent can well connect the carbon fiber and the matrix resin, making the carbon fiber reinforced composite material a Overall, with strong overall performance. [0003] Patent CN1318686C discloses a sizing agent for carbon fiber, which contains: (A) a compound having at least one epoxy group in the molecule, (B) an anionic surfactant with ammonium ions as counter ions, ( C) Nonionic surfactants. [0004] However, the storage and use stability of the above-mentioned carbon fiber sizing agent is relatively poor. During storage and use, emulsion stratification, uneven distribution of emuls...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings and deficiencies of the above-mentioned existing carbon fiber sizing agents, the primary purpose of the present invention is to provide an emulsion carbon fiber sizing agent with good storage and use stability, and no emulsion stratification will occur during storage and use. , uneven distribution of emulsion concentration, and can be stirred relatively quickly during use and transportation, ensuring that the performance of the sizing agent does not change during storage and use, and greatly ensuring that carbon fibers and their composites have higher overall performance of

Images