DE764436C - Electrical insulating material - Google Patents

Description

Electrical insulating material The invention relates to halogen-containing insulating materials for transform: atars, capacitors, switches, cables and other electrical devices and apparatus.

For such purposes, the use of liquid halogenated hydrocarbons, preferably those with a high halogen content that are highly inflammable: known. Of, these, substances are the aromatic compounds like diphenyl chloride, the optionally used in a mixture with trichlorobenzene, generally sufficient stable under the given conditions. The aliphatic connections, on the other hand, such as carbon tetrachloride and chlorinated ethane, because of their vapor pressure, at the usual working temperatures and because they attack almost all metal despite their good electrical properties are rarely used.

There are also synthetic masses made of polymerized vinyl chloride @ekangt, but because of their poor heat resistance and their oil-insolubility al-s electrical insulation can only be used to a limited extent.

According to the invention, as insulating means for electrical devices and apparatus, especially transformers, Capacitors. Counter, Cables and the like obtained by heat treatment of halogenated unsaturated aliphatic compounds Hydrocarbons with two or more halogen atoms in the molecule in the presence of Catalvsator @ n. like aluminum chloride, obtained substance: on its own or in] mixture used with chlorinated aromatic hydrocarbons.

For the production of the insulating materials to be used is assumed for example from Trichlorätlivl-en -, n, that in a known way is treated in the heat in the presence of aluminum chloride as a catalyst. hey Heating of, for example, 30 mol Tricliloräthvl ° ti and 3 mol aluminum chloride a liquid product with a boiling point of i 3o to. 22o 'received. which is expediently nigt with fuller's earth and soda. Its specific Weight is i.62. -The dielectric constant is 3.23 at room temperature and the loss angle 0.02. The; cleaned fabric is persistent and attacks the electrical Devices in which it is used. especially the metal parts. not on. Aluminum e.g. B. is of this substance neither in liquid nor in vapor form State attacked. Even when heated to 100 'for -24 hours in a nitrogen atmosphere the liquid shows no decomposition under pressure. The Brecliunus coefficient is at 25 '1, .5435 to 1.5485. The pour point is below -60 @.

If the heat treatment on the reflux condenser is continued for a long time, like this: a viscous mass or a solid resin of dark red color is obtained, withstand temperatures of 300 'and are soluble in' mineral oil. Will the reaction Carried out to this degree, the aluminum chloride content becomes appropriate elevated. For example, one part of aluminum chloride is taken for every 2 mol of trichlorethylene and the mixture, as stated above, heated to 85 ° on the Rüclülußk-ühler. After expiration a red resinous mass is obtained after 60 minutes.

If higher temperatures of 600 and 700 are used to carry out the reaction, the presence of a catalyst i is no longer necessary. and it is z. B. when passing trichlorethylene vapor through a pipe heated to 6oo to 7ao ', a resinous I-like mass obtained, for example, with trichlorethylene. Trichlorethylene or mixed with the liquid insulating material «can earth and then result in insulating materials. which have low viscosity and lower levels of viscosity. For example, a mixture of equal parts of the resin and Hriclilcrl, Enzol has a pour point of - and a viscosity of 1.42 to 1.53 ' Engler. A mixture of -23% of the resin and 7301o trichlorobenzene has a pour point of -6 = and a viscosity of 1.16 to 1 _.3 r = Engler.

In the drawing is the flow point of the various circuits of the resin with trichlorobenzene.

Di- or tetrahalogenated can also be used to produce the isolating agent Ethylene as well as halogenated acetylene, propylene, butylene and d-1. be used. The reaction products can be chlorinated in mixture with one another or with aromatic Connections come into use.

Claims (2)

PATENTA \ SPPCHE: -1. Use of reaction products resulting from halogenated unsaturated aliphatic hydrocarbons with or more halogen atoms in the molecule by heat treatment. optionally in the presence of catalysts will. alone or in admixture with chlorinated aromatic hydrocarbons as insulating means for electrical devices, in particular transformers. Capacitors. Counter. Cables and the like. 2. Use of reaction products according to claim i, which are mixed with in particular 50 to 7501o trichlorobenzene. To distinguish the subject matter of the invention from the state of the art, the following publications were taken into account in the granting procedure: German patent specification 1r. 579o48; Swiss patent no. 78-175; French patents `r. 693125, UK Patent 710 048 \ r. 394776; U.S. Patents No. 1 235 339, 1241738, 1319907, 18338-17. 1931373, 1931-155; Liebigs Annalen 433, p.48 (1923).