Epoxy resin-containing carbon fiber prepreg and preparation method thereof

Abstract

The present invention discloses an epoxy resin-containing carbon fiber prepreg and a preparation method thereof, and relates to the technical field of carbon fibers, the epoxy resin-containing carbon fiber prepreg comprises a carbon fiber cloth and the following components by weight: 20-35 parts of an epoxy resin mixture, 2-6 parts of a curing agent, 2-6 parts of an accelerator, and 1-8 parts of an epoxy toughening agent, the epoxy resin mixture is composed of phenolic resin and epoxy resin, the phenolic resin accounts for more than half of the total weight of the epoxy resin mixture, and the epoxy resin is any one or a mixture of two of 128 epoxy resin and 901 epoxy resin. The composite material formed after the prepreg is cured is low in porosity and good in performance, gummosis is not prone to being generated in the preparation process, the resin viscosity is moderate, the fluidity is high, fiber bundles can be fully impregnated, and the good prepreg is obtained.

Description

technical field [0001] The invention relates to the technical field of carbon fibers, in particular to a carbon fiber prepreg containing epoxy resin and a preparation method thereof. Background technique [0002] Prepreg is an important intermediate product in the production of composite materials. The quality of prepreg directly affects the overall performance of composite materials. The production of carbon fiber prepregs generally uses commercially available carbon fibers and resins directly, and the quality of prepregs is improved by optimizing the processing technology and adding certain modifiers later. [0003] However, there is currently a problem with the interfacial bonding strength between carbon fiber and resin during the preparation process. Generally speaking, in order to obtain high interfacial bonding strength between carbon fiber and resin, it is necessary to use a resin with the same or similar chemical structure as the matrix resin as the main component o...

AI Technical Summary

Problems solved by technology

In practical application, due to the wide variety of resins, and the type of resin that will be matched with carbon fiber in the factory cannot be predicted in the later stage, the sizing agent used can only be based on epoxy resin, which is currently the most used

However, epoxy resins also have different structures, so the direct use of commercially available carbon fibers inevitably has the problem of limited compatibility with the resin used, which limits the quality of prepregs to a certain extent.