▎ 摘　　要

NOVELTY - High-stability positive temperature coefficient (PTC) material comprises 40-70 wt.% polymer base material, 30-60 wt.% conductive filler, and internally reacted salt. The polymer base material comprises first component polymer and a second component polymer that are uniformly dispersed. The second component polymer is an anionic ionomer, and the anionic ionomer accounts for 5-10 vol.% of the high-stability PTC material. The surface of the conductive filler is modified by a cationic polymer and is uniformly dispersed in the polymer matrix. The counter cation contained in the anionic ionomer forms an internal reaction with the counter anion of the cationic polymer to form a salt. USE - High-stability positive temperature coefficient material for self-temperature-limiting heating element and circuit protection device. ADVANTAGE - The polymer based positive temperature coefficient (PPTC) circuit protection element has higher holding current and better voltage and current resistance. The prepared PPTC self-temperature-limiting heating film has higher heating starting rate and lower heating rate attenuation after long-term use. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic structural view of a self-temperature-limiting heating element. PPTC material (3) Metal interdigitated electrodes (4)