COMPOSITE MATERIALS WITH ELECTRICALLY CONDUCTIVE AND DELAMINATION RESISTANCE PROPERTIES Russian patent published in 2019 - IPC C08J5/24 

FIELD: technological processes.

SUBSTANCE: invention relates to fiber-reinforced polymer composites for use in the aerospace industry. Described herein is a curable composite material containing: at least two layers of reinforcement fibers impregnated with a curable matrix resin; and at least one interlayer region formed between adjacent layers of reinforcement fibers, while the interlayer region contains (I) carbon-based nanoscale structures dispersed in the curable matrix resin, and (II) insoluble polymeric toughening particles enclosed in the same curable matrix resin, wherein nanoscale structures based on carbon are at least one size smaller than 100 nm (0.1 mcm), polymeric reinforcing particles selected from toughening particles, elastomeric particles or cross-linked particles, polymeric toughening particles have an average size (d50) that is at least 100 times larger than the smallest size of carbon-based nanoscale structures, and the average particle size is in the range of 10–100 mcm, polymeric toughening particles are insoluble in the curable matrix resin in the interlayer region during curing of the composite material and remain discrete particles after curing, and after curing, the composite material has an electrical conductivity in the z-direction of more than 1 S/m, compressive strength after impact (CAI), after an impact of 30 J, more than 250 MPa when measured in accordance with ASTM7136/37 and interlayer fracture strength of type I (G_Ic) of more than 300 J/m² when measured in accordance with EN6033. Also described are methods for producing a curable composite material and a method for producing a composite structure.

EFFECT: composite material with high impact strength and resistance to delamination, contributing to the prevention of the "marginal discharge" phenomenon.

24 cl, 13 dwg, 9 tbl