Solvent-free polyurethane adhesive for electric appliances and preparation method of solvent-free polyurethane adhesive

The invention relates to a solvent-free polyurethane adhesive for electric appliances and a preparation method of the solvent-free polyurethane adhesive, and belongs to the technical field of adhesives. According to the invention, the hydroxyl-terminated polybutadiene, dimer acid polyester polyol, hexamethylene diisocyanate and isophorone diamine are selected as basic raw materials for reaction, hydroxyl PS microspheres are added to assist in providing a certain amount of heat capacity as a part of hard segments, and DOPO-HQ containing a benzene ring and a phenanthrene ring is introduced, so that the prepared adhesive finished product has excellent heat resistance. Besides, silicon dioxide, magnesium oxide and mica powder with good insulation performance are subjected to surface modification, and the three modified inorganic particles are compounded to serve as an insulation filler to be added into a system, so that tight compounding between the insulation filler and a polymer is realized; as the surface of t