Material with PTC behaviour for medium- and high-temperature application, self-regulating structures comprising same and manufacturing method

摘要

Material having positive temperature coefficient behavior, in preparing structure of self-regulating cables, comprises compatible polymer alloy comprising polar polyolefin (5-20 wt.%), at least one thermoplastic elastomer copolymer (60-90 wt.%) having polyester-ester or polyester-ether base, and conductive filler (5-20 wt.%), where the material is devoid of fluorescent compound. Independent claims are included for: (1) a self-regulating structure, preferably cable, heating tube and variable electric resistance depending on temperature comprising the material; and (2) a preparation of the self-regulating structure, preferably self-regulating cable comprising the material comprising mixing the mixture comprising polar polyolefin (5-20 wt.%), thermoplastic elastomer copolymer (60-90 wt.%) having polyester-ester or polyester-ether, and conductive filler (5-20 wt.%), in a twin-screw extruder of Buss comixer, at 220-280[deg] C, extruding the obtained homogeneous mixture in strips, cutting the strips to obtain granules and introducing the granules in the extruder to form the structure, which is inserted in at least two electrical conductors.