Tear-resistant high-temperature-resistant flexible insulating film, composite material and preparation method

The invention relates to the technical field of insulating composite materials, in particular to a tear-resistant and high-temperature-resistant soft insulating film, a composite material and a preparation method of the composite material. In the preparation method, polymerization liquid is prepared as follows: aromatic acyl chloride and polyphosphoric acid are stirred uniformly, 4, 6-diamino resorcinol hydrochloride is added, polymerization is performed firstly, and a polymerization solution is obtained; the preparation method comprises the following steps: preparing a polymer, then raising the temperature for polycondensation so as to form an oxazole structure block in the polymer, and introducing part of the oxazole structure block with a rigid plane structure and a strong electron-donating conjugation effect into a polymerization solution of a paper base and a film, so that the mechanical property and modulus of a base material are improved from the angle of a molecular structure. Therefore, both the pape