Explanation

It refers to the composition of resin matrix and reinforcement, which is made by impregnating continuous fibers or fabrics with resin matrix under strictly controlled conditions. It is an intermediate materials for manufacturing composite materials. There are many varieties and specifications: according to the fiber layout, it can be divided into unidirectional, fabric, pre impregnated yarn, and fiber types; According to the characteristics of resin, it can be divided into thermosetting resin based and thermoplastic resin based; According to the content of resin, it can be divided into adhesive absorption type and zero adhesive absorption type; According to the preparation method, it can be divided into hot-melt method, solution method and powder prepared prepreg. The technical indicators mainly include: thickness, resin content, volatile content, resin flow ability, viscosity, gel time, storage period and pot life, etc. Usually, the upper and lower surfaces are covered with a layer of transparent polymer film and isolation paper, which are mainly used to prevent pollution and unidirectional transverse cracking, and to facilitate cutting and scribing during blanking. thermosetting resin base usually needs to be stored at -18 ℃ to delay the assimilation reaction of resin and ensure a long enough storage period.

Classification