METHOD OF FABRICATING REINFORCED POLYMER MATERIALS Russian patent published in 1999 - IPC

FIELD: polymer production. SUBSTANCE: composite based on epoxy binder contains epoxy resin and hardening system consisting of cold-hardening amine hardener and water. Fibrous filler is separately impregnated with resin and hardening system and then molded. According to invention, before hardening system is added, material is thermally treated at 25 to 120 C, while weight ratio of water to hardener ranges from 1:0.7 to 1:1.4. EFFECT: increased static bend breaking stress and specific impact elasticity of composites and simultaneously prolonged prepreg storage time. 2 cl, 3 tbl, 20 ex