The prepreg is a composition in which a resin matrix and a reinforcement are formed by impregnating a continuous fiber or fabric under a strictly controlled condition with a resin matrix.
According to the physical state, the prepreg can be divided into unidirectional prepreg, unidirectional fabric prepreg and fabric prepreg. According to the resin matrix, the prepreg is divided into thermosetting resin preg and thermoplastic resin preg. According to different reinforcing materials, it is divided into carbon fiber (fabric) prepreg, glass fiber (fabric) preg, aramid fiber (fabric) preg. According to the fiber length, it is divided into the short fiber (below 4176mm) prepreg, long fiber (1217mm) preg and continuous fiber preg. Divided by different curing temperature, curing temperature (120 ℃) presoak material, high temperature (180 ℃) in curing materials as well as the curing temperature over 200 ℃ presoak material, etc.
The preparation methods of prepreg include a dry method and a wet method. Dry method and powder method and hot – melt resin method (the latter is also known as a hot – melt method). Powder prepreg refers to the resin powder attached to the fiber, after partial melting, forming a resin discontinuous, fiber is not fully soaked by the resin of a complex. Compared with the composites made of dry prepreg and wet prepreg, the former has a better appearance and higher control precision of resin content. As for the advanced aviation composite materials, they often show that the wet-heat stability of the hot-melt composite materials is better than that of the solution composite materials: the mechanical properties (such as bending modulus and strength, laminar shear strength, etc.) of the former is better than that of the solution composite materials: the mechanical properties (such as bending modulus and strength, laminar shear strength, etc.) of the former is better than that of the solution composite materials.
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