▎ 摘　　要

NOVELTY - Electrothermal film includes a heating layer (101) and a thermal insulation coating (102), where the thermal insulation coating is obtained by coating thermal insulation coating on one side of the heating layer to form a film. The thermal insulation coating contains hollow microspheres with a core-shell structure. The inner core of the hollow microsphere with a core-shell structure is a polymer hollow microsphere, and the outer shell is a functional filler. USE - The film is used for a heating system, radiator, air conditioner, heating radiator, point type heating system and heating radiator. ADVANTAGE - The hollow microspheres with a core-shell structure contained in the thermal insulation coating are double-layer hollow structures. When one layer of the inner core and the outer shell is broken, the hollow structure is still maintained, which effectively reduces the probability of the hollow ball being broken. The stability and thermal insulation performance of the thermal insulation paint are improved, so that the electrothermal film can effectively reduce the thickness of the electrothermal film while ensuring its thermal insulation effect. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: a thermal insulation coating applied to the electrothermal film, comprising 50-60 pts. wt. hollow microspheres with a core-shell structure, 30-35 pts. wt. aqueous polyurethane emulsion, 1-5 pts. wt. film-forming agent, 2-5 pts. wt. leveling agent, 0.2-1 pts. wt. dispersant, 0.2-1 pts. wt. thickener, 1-5 pts. wt. defoamer, and 1-5 pts. wt. surface tension regulator; and a preparation method for preparing the thermal insulation coating, involving preparing the hollow microspheres with a core-shell structure, batching according to the raw material composition of the thermal insulation coating, and performing magnetic stirring at room temperature for 0.5-1.5 hours. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of an electrothermal film. 101Heating layer 102Thermal insulation coating 103Shielding layer 104Reflection layer 105Far infrared radiation enhancement layer