Introduction of carbon fiber epoxy resin composite material
Carbon fiber has excellent performance, but the fiber cannot be used alone, and must be combined with other matrix
materials to exert its performance.
The matrix used in carbon fiber resin-based composite materials can be divided into two categories: thermoplastic resin and thermosetting resin. Among them, thermoplastic resins, such as polyphthalamide, polycarbonate, polyester, etc., have excellent fracture toughness, but poor thermal stability, which is difficult to meet application requirements; thermosetting resins, such as epoxy resin, phenolic resin, and bismaleic polyphthalein Imine resin, polyphthalimide resin and unsaturated resin, etc., through curing agent or heat, the reactive low molecular weight prepolymer can be crosslinked and polycondensed to form an insoluble and infusible body structure, and the material is thermally stable Excellent performance and mechanical properties.
Among the commonly used thermosetting resins, epoxy resin has many grades and wide applications, and has become the main matrix material in carbon fiber reinforced composite materials. Epoxy resin has good bonding properties, excellent electrical properties and chemical resistance, and excellent manufacturability, so it has become an important raw material for carbon fiber composite matrix. The combination of carbon fiber and epoxy resin can give play to the advantages of light weight and high strength, and is widely used in sports equipment, mechanical processing, aerospace, orbital aerospace and other fields.
Epoxy resin is a polymer prepolymer with 2 or more epoxy groups in the molecular structure. Because its molecular chain contains active epoxy groups, it can be formed by cross-linking reaction under the action of curing agent. Three-dimensional network structure, insoluble and infusible high polymer, excellent mechanical properties, strong adhesion, and low curing shrinkage are the salient features of epoxy resin. In addition, in practical applications, epoxy resin also has outstanding characteristics such as good manufacturability, excellent electrical insulation, good stability, and good heat resistance, so it is used as one of the main raw materials of carbon fiber reinforced composite materials.