90-degree special temperature selflimiting electric tracing band

Abstract

The invention discloses a 90-degree special temperature selflimiting electric tracing band, which comprises a conductive core, and a PTC material layer, a polymer insulating inner protective sleeve, an aluminum-magnesium alloy shielding layer and a polymer insulating outer protective sleeve which are covered outside the conductive core in turn, wherein the PTC material is prepared by mixing and melting the following raw material components in part by weight: high-density polyethylene 86-87, carbon black 12-14, tribasic lead sulfate heat stabilizer 0.11-0.13, lead silicate 0.04-0.06, styrenated phenol antioxygen 0.05-0.15, p-tert-butylphenyl salicylate light stabilizer 0.12-0.14 and tribromophenol fire retardant 0.05-0.15. The highest temperature of the band is maintained at 90+ / -5 DEG C, and the band can be used as solar electric tracing band in places with large temperature difference.

Description

Technical field [0001] The present invention involves the field of wires and cables, which is specifically a 90 ° dedicated self -limited temperature pair -with tropical. Background technique [0002] Electric -loving tropical is a new type of high -tech product. Since its entered application in 1971, the self -limited -e -electrical partner tropical has become the most universal electrical partner tropical type in the world today.They can be widely used in liquid objects to transport anti -freezing insulation in pipelines and tanks, maintaining process temperature, heating highways, ramps, pedestrian crossings, eaves and flooring.Inside the self -limited electrical accompanying heat, the PTC polymer material with a heating effect is distributed between the two electrical conductors.At the time of through, the internal PTC polymer material is heating and expanding, the resistance becomes large, the heat is reduced, and the temperature is reduced; when the temperature is reduced, ...

AI Technical Summary

Problems solved by technology

In northern China, the temperature difference between winter and summer can reach 70 degrees Celsius, and the surface temperature of the electric heating cable installed on the solar water heater can reach 95-100 degrees Celsius under direct sunlight in summer. The maximum maintenance temperature of the traditional solar electric heating cable is 70± 5 degrees Celsius, this kind of electric heating cable in the temperature control field, after a summer of high temperature exposure, the PTC polymer material will be obviously damaged, and the maximum maintenance temperature cannot be reached during winter use, and the service life is greatly reduced

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