| abstract |
The invention belongs to the technical field of electric heating materials, and particularly relates to a short-circuit-preventing high-safety composite electric heating film and a preparation method thereof. The composite electric heating film comprises a lower electrode layer, a plurality of insulating heat conduction color-changing bodies, an electric heating layer and an upper electrode layer, wherein the insulating heat conduction color-changing bodies are obtained by coating insulating heat conduction color-changing body slurry on the upper surface of the lower electrode layer and curing, and the insulating heat conduction color-changing body slurry consists of high polymer resin, a solvent, temperature sensing color-changing capsule powder and high-heat-conductivity-coefficient inorganic material powder; the electric heating layer is obtained by coating the electric heating layer slurry on the composite surface of the insulating heat conduction color changing body and the upper surface of the lower electrode layer and then curing; the upper electrode layer and the lower electrode layer are composite transparent conductive films. The invention greatly reduces the risk of short circuit caused by direct contact of the electrodes with the sandwich structure and improves the safety of the electrothermal film; the phenomenon of uneven heating of the electric heating film is obviously improved; the preparation process is simple, the reliability is strong, the application range is wide, and the function of detecting the working state in real time is achieved. |