Self-temperature-limiting electric tracing band with positive temperature coefficient and preparation method of self-temperature-limiting electric tracing band

Abstract

The invention discloses a self-temperature-limiting electric tracing band with a positive temperature coefficient and a preparation method thereof, and relates to the technical field of tracing band preparation, the self-temperature-limiting electric tracing band comprises a wire, the wire is coated with a heat conduction material, and the heat conduction material is sequentially provided with a first insulating layer, a shielding layer and a second insulating layer; the heat conduction material is composed of, by mass, 5-15% of a conductive filler, 1-5% of a sensitizer and a heat tracing band base material. According to the invention, a single high polymer material is adopted as a heat tracing band base material, and the content of conductive filler is low, so that the heat tracing band has excellent bending resistance, high tensile strength and high PTC strength; in the preparation process, after the electric tracing band is extruded into a line, static high-temperature heat treatment and electric treatment are utilized to promote directional movement and agglomeration of the conductive filler, the distribution state of the filler is accurately regulated and controlled, a locally concentrated conductive network is constructed, and the electric tracing band has excellent processing fluidity, mechanical property and heating performance; the method can be widely applied to the fields of various tank bodies, pipeline heat preservation, electric blankets and the like.

Description

technical field [0001] The invention relates to the technical field of the preparation of tracing cables, in particular to a self-limiting temperature electric tracing cable with a positive temperature coefficient and a preparation method thereof. Background technique [0002] The self-limiting temperature electric heating material with PTC effect is a conductive composite material with thermal switch characteristics, which can automatically adjust the output power according to the ambient temperature, without the risk of high temperature overheating and self-burning, and is the best electric heating cable in the world today. It is widely used in antifreeze protection and process temperature maintenance of various pipes and tanks. PTC materials are usually divided into ceramic PTC and polymer-based PTC. Among them, polymer-based PTC materials have become the most widely used electric heating cables due to their excellent processing and use properties. [0003] In the PTC el...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a self-regulating heating cable with a positive temperature coefficient to solve the problem that qualified self-limiting temperature heating cables cannot be produced in the field of electric heating blankets that have extremely high requirements on flexibility and bending performance. Heat tracing cable and its preparation method, which uses a single polymer material as the matrix and has a low content of conductive filler. After the cable is extruded into a line, static high-temperature heat treatment and electrical treatment are used to promote the directional movement and agglomeration of the conductive filler, and precise control The distribution state of the filler builds a locally concentrated conductive network, which solves the above problems

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