EPOXY BINDER, PRE-PREG BASED THEREON, AND PRODUCT MADE THEREFROM Russian patent published in 2022 - IPC C08L63/00 C08L63/04 C09J163/00 C09J163/04 C08J5/24 C08K3/11 

FIELD: polymers.

SUBSTANCE: invention relates to the field of creating mortarless single-component epoxy binders with accelerated energy-efficient hardening mode for producing structural polymer materials based on fibrous reinforcing fillers recycled according to the pre-preg technology, acceptable for use in the aviation, helicopter, shipbuilding, automotive, wind power, sports, electronic, construction and other industries. Epoxy binder includes a mixture of wt.%: polyepoxy resin 34.9 to 38.5, low molecular weight epoxy diane resin 17.0 to 22.0, and high molecular weight epoxy diane resin 25.0 to 29.3, a latent hardener - dicyandiamide 7.8 to 10.5, a hardening accelerator - asymmetrically disubstituted urea 2.4 to 3.2, and a modifier - "core-shell" rubber nanoparticles 4.4 to 5.2. A multifunctional epoxy resin selected from a homologous series of epoxy resins based on triphenols, epoxy novolac resins and halogen-containing epoxy resins, is used as a multifunctional epoxy resin. The product is manufactured by direct pressing or vacuum moulding of the pre-preg using the claimed binder, wherein the pre-preg includes said epoxy binder in an amount from 30.0 wt.% to 50.0 wt.% and a fibrous filler in an amount from 50.0 wt.% to 70.0 wt.%.

EFFECT: invention allows for an increase in the reaction activity of the binder and pre-pregs based thereon, and contributes to the formation of products made of structural polymer materials with improved stress-strain and impact-resistant characteristics.

8 cl, 3 tbl, 6 ex