electrical insulating compounds. Scheme, description

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electrical insulating compounds. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electricity for beginners

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Compounds are insulating compounds that are liquid at the time of use and then harden. Compounds do not contain solvents.

According to their purpose, these compositions are divided into impregnating and filling. The first of them is used for impregnating the windings of electrical machines and apparatuses, the second - for filling cavities in cable boxes, as well as in electrical machines and devices for the purpose of sealing.

Compounds are thermosetting (not softening after curing) and thermoplastic (softening with subsequent heating). Compounds based on epoxy, polyester and some other resins can be attributed to thermosets. Thermoplastic compounds include compounds based on bitumen, waxy dielectrics, and thermoplastic polymers (polystyrene, polyisobutylene, etc.). Impregnation and potting compounds based on bitumen in terms of heat resistance belong to class A (105 ° C), and some to class Y (up to 90 ° C). Epoxy and organosilicon compounds have the highest heat resistance.

MBK compounds are made on the basis of methacrylic esters and are used as impregnating and filling compounds. After hardening at 70-100°C (and with special hardeners at 20°C) they are thermosetting substances that can be used in the temperature range from -55 to +105°C.

Author: Smirnova L.N.

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