METHOD FOR PRODUCTION OF PREPREG Russian patent published in 1995 - IPC

FIELD: production of prepreg. SUBSTANCE: method for production of prepreg on epoxy binder containing epoxy-diane resin and curing system based on amine curing agent of cold setting includes separate impregnation of fibrous filler with components of binder and drying preliminary impregnation is accomplished with resin and then, with curing system with resin-curing agent mass ratio in prepreg of (3.1-7.2):1 and amount of binder equalling 32-77 mas.%. Curing system consists of water and curing agent in mass ratio of 1: 1.5-1: 2.5, respectively. Curing system is used in form of matrix polymer taken from group containing bustilate M, polyvinyl acetate and polyethylene oxide, water and curing agent at their mass ratios of 4:4: (1.6-4): 1: 3, respectively. EFFECT: increased breaking stress at static bending or increased specific impact strength of polymer composite materials. 3 cl, 7 tbl