Resin membrane melt impregnation forming method of fiber reinforced PBT composite material

The invention discloses a resin membrane melt impregnation forming method of a fiber reinforced polyethylene terephthalate (PBT) composite material, comprising the following steps: 1) processing to form a cyclic butylenes terephthalate(CBT) resin membrane with the thickness of 15-700 mu m; 2) successively placing a demolding cloth, the CBT resin membrane, a fiber reinforced material and a demolding cloth on a mold; 3) heating up the assembly obtained by the step 2) to 180-225 DEG C under vacuum and preserving the heat for 5 min-6 h to melt the CBT resin in the CBT resin membrane and completely impregnate the fiber reinforced material, simultaneously polymerizing the CBT resin into PBT with high molecular weight, cooling, and then demolding. According to the invention, the forming method has no need to prepare a prepreg, the forming process can be realized at the temperature which is lower than the PBT melting temperature, the process is simple and easy to operate, the efficiency is high, and large members can