CARBON FIBER SIZING AGENT, CARBON FIBER STRAND, AND FIBER-REINFORCED COMPOSITE

摘要

A carbon fiber sizing agent imparts good bonding performance to carbon fiber, is used to reinforce a thermoplastic matrix resin, and provides a carbon fiber strand applied with the sizing agent and a fiber-reinforced composite reinforced with the carbon fiber strand. The sizing agent for carbon fiber is used to reinforce thermoplastic matrix resin. The sizing agent essentially contains a polymer component having a glass transition temperature of at least 20 deg.C. and exhibits no endothermic peaks indicating an endothermic heat of fusion due to crystalline melting of at least 3 J/g in a determination with a DSC. The weight ratio of the polymer component is 10 to 100 wt % of the nonvolatile components of the sizing agent. The polymer component is at least one component selected from the group consisting of an aromatic polyester resin, aromatic polyester-polyurethane resin and amine-modified aromatic epoxy resin.

主权项

1. A sizing agent for carbon fiber used for reinforcing a thermoplastic matrix resin, the sizing agent essentially comprising:
a polymer component having a glass transition temperature at least 20 deg C. and exhibiting no endothermic peaks indicating an endothermic heat of fusion due to crystalline melting of at least 3 J/g in a determination with a differential scanning calorimeter; wherein the weight ratio of the polymer component constitutes from 10 to 100 wt % of the nonvolatile components of the sizing agent; wherein the polymer component is at least one component selected from the group consisting of an aromatic polyester resin, aromatic polyester-polyurethane resin and amine-modified aromatic epoxy resin; wherein the aromatic polyester-polyurethane resin is a polymer produced by addition polymerization of an aromatic polyester polyol and polyisocyanate; wherein the amine-modified aromatic epoxy resin is a reaction product of an aromatic epoxy compound and hydroxyl-group-containing amine compound with the ratio of the hydroxyl-group-containing amine compound ranging from 1.0 to 2.0 mol equivalent to the epoxy groups of the aromatic epoxy compound.