Manufacturing method of carbon fiber bundle

Abstract

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.

Description

technical field [0001] The invention relates to a method for manufacturing reinforced materials of composite materials, in particular to a method for manufacturing carbon fiber bundles. Background technique [0002] As a reinforcing material for advanced composite materials, carbon fiber has been widely used in the fields of aerospace and high-end sporting goods. In recent years, with the continuous decline of its cost, its application in energy, automobile manufacturing and electronics industries is also rapidly expand. In traditional application fields such as aerospace, carbon fiber is mainly compounded with thermosetting resin in the form of continuous fiber, so the sizing agent used is mostly an aqueous emulsion of epoxy resin. However, in many industrial fields such as automobile manufacturing, not only low cost is required, but also the molding shape is complicated. Therefore, carbon fibers are generally in the form of chopped fibers and compounded with thermoplastic...

AI Technical Summary

Problems solved by technology

If the fiber opening and dispersion uniformity are not good, the performance of the final composite material will be low and unstable

In order to improve this phenomenon, a technology similar to glass fiber is adopted, that is, the chopped carbon fiber is dispersed in a solvent and then compounded with the resin substrate; in terms of safety and cost, the solvent used here is generally water, but The surface of carbon fiber does not have a good affinity with water, so it is difficult to disperse uniformly in water

[0004] After research, we found that one of the important reasons for the above problems is the sizing agent used by carbon fiber with epoxy resin as the main component. Because epoxy resin has a high viscosity and is a thermosetting resin, it is difficult to open the fiber bundle after sizing , and the affinity between epoxy resin and water is poor, which makes it difficult to disperse fibers in water