▎ 摘　　要

NOVELTY - Preparing conductive filler comprises adding 5-10 pts. wt. carbon nanotubes into 50-100 pts. wt. polar solvent, and ultrasonically dispersing to obtain a carbon nanotube dispersion. 30-40 pts. wt. graphene and 150-200 pts. wt. ethanol are emulsified by an emulsifier to obtain an emulsion. The carbon nanotube dispersion and the emulsion are ball milled to obtain a graphene/carbon nanotube mixture. The graphene/carbon nanotube mixed solution is suction-filtered, washed with deionized water and then dried to obtain the graphene/carbon nanotube composite conductive filler. USE - Method for preparing a conductive filler for conductive ink and a curved surface heating body for a wearable heating physical therapy protecting tool product. ADVANTAGE - The filler has better conductivity and dispersibility, and the prepared conductive ink can be sprayed multiple times to form a multi-layer conductive layer, the thickness of the conductive layer is increased, the square resistance is low, and the temperature of the prepared heating element is relatively high. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a conductive filler, which is prepared by using the method; (2) a method for preparing conductive ink, which comprises adopting the arbitrary method to prepare graphene/carbon nanotube composite conductive filler, and mixing graphene/carbon nanotube composite conductive filler with resin; (3) a conductive ink, which is prepared by using the method; (4) a curved heating element, which comprises a curved substrate, a conductive layer coated on the curved substrate, a conductive electrode arranged on the conductive layer, and an insulating layer covering the conductive layer and the conductive electrode; and (5) a method for preparing a curved surface heating element, which comprises preparing conductive ink, spraying conductive ink on the curved surface substrate to form a conductive layer, disposing conductive electrodes on the conductive layer, spraying insulating paint to cover the outermost conductive layer and the conductive electrodes to form a graphene curved surface heating element, spraying conductive ink on the curved surface substrate to form a conductive layer, spraying two layers of conductive ink on the curved surface substrate to form two conductive layers, arranging a conductive electrode on the conductive layer, and spraying conductive ink on the curved substrate to form a conductive layer.