Carbon fiber sizing agent for carbon fiber and carbon fiber composite material

摘要

The present invention is excellent in adhesion between the carbon fibers and a thermosetting resin , factors become carbon fibers for sizing agent which does not generate voids in the strength reduction of the carbon fiber composite material , carbon fibers and using such carbon fibers for sizing agent I provide a carbon fiber composite material . As A carbon fiber for a sizing agent , in the presence of a polyester resin X having a specific hydrophilic group in the molecule , in an aqueous medium , the vinyl monomer Y with an epoxy group in the molecule , a vinyl monomer Y and co a specific modified resin obtained by polymerizing the polymerizable monomer Z, and certain aliphatic nonionic surfactant , is used as which comprises a specific ratio . [ Selection Figure ] None