▎ 摘　　要

NOVELTY - Conductive micropowder comprises a solid filler for polymer-based PTC materials and a crystalline organic layer coated on the surface of the solid filler for polymer-based PTC materials. The solid filler for polymer-based PTC material includes a conductive carbon material. The main component of the crystalline organic layer is crystalline organic matter, and the mass ratio of the conductive carbon material and the crystalline organic matter is 10-120:10-50. The particle size of the conductive fine powder is ≤ 80 μm. USE - The micropowder is useful for polymer-based positive temperature coefficient (PTC) materials. ADVANTAGE - The micropowder can solve the problem that the PTC electric heating coating is easy to cause thermal runaway and easy to increase the room temperature resistance when it is used for a long time. It can obviously inhibit the NTC phenomenon of polymer-based PTC material and improve the safety of the material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the conductive micropowder, comprising drying the mixed slurry into a solid, and then crushing into fine powder, where the mixed slurry is obtained by dispersing the solid filler for polymer-based PTC materials in a crystalline organic emulsion, the solid filler for polymer-based PTC material includes a conductive carbon material, the mass ratio of the conductive carbon material and the crystalline organic matter in the crystalline organic matter emulsion is 10-120:10-50, and the particle size of the conductive fine powder is ≤ 80 μm; and PTC self-temperature-controlling coating, comprising resin emulsion, conductive micropowder and additives dispersed in the resin emulsion.