FIBERGLASS OF ELECTRO-INSULATING PURPOSE Russian patent published in 2023 - IPC C08J5/24 C08L63/02 C08G59/22 H01B3/08 H01B3/40 C08G59/40 

FIELD: composite materials.

SUBSTANCE: invention relates to the field of creation of high-strength composite materials based on fibrous fillers and epoxy binders, which can be used for sealing of electrical and radio engineering products, including inductance coils, high-voltage discharger coils, low-voltage toroid transformers, throttles, switches, etc. Composite material includes a polymer binder of the following composition: epoxy resin, 4,4'-diaminodiphenylsulfone curing agent, and a thermoplastic modifier, as which a mixture of thermoplastics is used, consisting of polyester sulfone and carding polyarylene etherketone with a phthalide group, as well as a reinforcing filler containing 99.9% of silicon dioxide, which is quartz fabric, at the following ratio of components, wt. pt.: epoxy resin – 100, polyester sulfone – 2.5-10, carding polyarylene etherketone with a phthalide group – 2.5-10, 4,4'-diaminodiphenylsulfone – 29-30, quartz fabric – 200-210.

EFFECT: increase in electrical strength and specific surface electrical resistance of composite.

1 cl, 2 tbl, 8 ex