The invention discloses a manufacturing method of a carbon
fiber bundle. After non-sized
carbon fibers are soaked in a
thermoplastic sizing agent bath with the concentration of 1.0-5.0%, the
carbon fibers are subjected to
drying and heat treatment at the temperature of 200-240 DEG C, in the
drying and heat treatment process, the
mass reduction rate of the
thermoplastic sizing agent is within 30%-70%, and finally the carbon
fiber bundle containing 0.3-2.5% of the
thermoplastic sizing agent is obtained. The manufacturing method has the advantages that in the molding and compounding process, thethermoplastic sizing agent is attached to the surface
layers of the fibers, then by means of
specific heat treatment, the fibers show excellent dispersion performance in water, meanwhile, the affinityof the fibers and a thermoplastic
resin matrix is also greatly improved, the abrasion resistance and the splitting performance of the fibers are good, the fibers and resin have excellent affinity, ahigh-performance carbon
fiber reinforced thermoplastic resin material can be prepared, and the manufacturing method is especially suitable for the fields such as automobile manufacturing and electronic product shells.