PREPREGS AND MOULDED PRODUCTS, OBTAINED FROM THEM AT LOWER TEMPERATURE Russian patent published in 2015 - IPC C08G18/10 C08G18/79 C08G18/16 C08J5/24 B32B5/02 B32B27/04 

FIELD: chemistry.

SUBSTANCE: claimed group of inventions relates to prepregs and components, obtained from them at lower temperature. Described are prepregs consisting mainly of: A) at least one fibrous base, and B) as matrix material of at least one urethdione group-containing powder-like polyurethane composition with high reaction ability, which contains mainly: a) at least one urethdion group-containing hardening agent based on products of polybonding of aliphatic, (cyclo)aliphatic or cycloaliphatic polyisocyanates with urethdione groups and compounds with hydroxyl groups, which is in solid form at temperature below 40°C, and in liquid form at temperature higher than 125°C and contains less than 5 wt % of free NCO-groups and from 3 to 25 wt % of urethdione groups, and b) at least one polymer with hydroxyl groups, which is in solid form at temperature below 40°C, and in liquid form at temperature higher than 125°C, and possesses hydroxyl number from 20 to 200 mg KOH/g, c) from 0.1 to 5 wt % of at least one catalyst, selected from the group, including quaternary ammonium salts and/or quaternary phosphonium salts with halogens, hydroxides, alcoholates or anions of organic or inorganic acids as counterions, and d) from 0.1 to 5 wt % of at least one cocatalyst, selected from the group, including: d1) at least one epoxide, with components a) and b) being taken in such ratio that for each hydroxyl group of component b) there is from 0.3 to 1 urethdione group of component a). Also described is method of obtaining said prepregs, and their application. Method of manufacturing components from composite material is described, with said prepreg, in temperature interval from values higher than 100°C and to 160°C, being pressed in suitable form under pressure and if necessary uncer vacuuming. Components from composite material, obtained by claimed method, are described.

EFFECT: stable in storage prepregs, preserving reaction ability, and therefore suitable for mixing, environmentally friendly, possessing optimal mechanical properties, simplicity of processing, and high atmosphere resistance.

17 cl, 4 dwg, 1 ex