Electric insulation with a silicic acid additive made by a melt

Details Electric insulation with a silicic acid additive made by a melt Electric insulation with a silicic acid additive made by a melt

1987-07-21

1989-01-03

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523218, 524493, 524494, 174110SR, 174110PM, C08K 334, H01B 700, H01B 342, H01B 344

Patent

active

047957697

ABSTRACT:
The invention relates to electric insulation with a polyolefin base for medium and high voltage from about 10 kV up. In insulation of this type the formation of so-called water trees is to be prevented on the one hand and on the other hand, the dielectric losses are to be kept as low as possible. For this purpose it is provided that silicic acid prepared in the following manner is added to the insulation: SiO.sub.2 -containing mineral substances are melted with additions of aluminum oxide, boron oxide and carbonates and/or oxides of alkali and earth-alkali metals to form a homogeneous glass phase; from the glass melt, glass bodies with a large surface are made; the glass bodies are subjected to a leaching process with mineral acid; the porous SiO.sub.2 bodies produced are washed and dried and optionally milled. The electric insulation according to the invention is particularly well suited for use in cables and wires.

REFERENCES:
patent: 3915922 (1975-10-01), Suzuki et al.
patent: 4132700 (1979-01-01), Stephens et al.
patent: 4244860 (1981-01-01), Kuhnel et al.
patent: 4458044 (1984-07-01), Henkel
patent: 4507387 (1985-03-01), Gajewski et al.
patent: 4574111 (1986-03-01), Henkel et al.
patent: 4581290 (1986-04-01), Henkel et al.
patent: 4623755 (1986-11-01), Henkel et al.

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