METHOD OF INCREASING TENSILE STRENGTH OF COMPOSITE MATERIAL BY MEANS OF PRELIMINARY IMPREGNATION OF CARBON FIBERS Russian patent published in 2019 - IPC C09D201/00 B05D5/10 B82B3/00 B82Y30/00 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of improved composite structures. To increase tensile strength of the composite material, the carbon fiber surface is modified by carbon nanotubes (CNT). CNT is deposited on carbon fiber surface by carbon fiber impregnation with CNT solution in 2-propanol with CNT concentration in range from 200 to 500 mcg/ml. A hardener is added to the solution: aminoethylpiperazine or pentaethylene hexamine, with concentration from 150 to 250 mcg/ml. Coal fiber is impregnated with solution by complete submersion of modified carbon fibers into solution, which is additionally heated to temperature of 80–85 °C.

EFFECT: higher mechanical strength of composite due to formation of mesh of carbon nanotubes associated with carbon fiber.

1 cl, 1 dwg