Low-dielectric-loss polyurethane packaging material for capacitor and preparation method thereof

The invention discloses a low-dielectric-loss polyurethane packaging material for a capacitor and a preparation method of the low-dielectric-loss polyurethane packaging material, and belongs to the technical field of polyurethane packaging materials for capacitors. The polyurethane packaging material comprises a component A and a component B, the component A comprises the following components in parts by weight: 20-50 parts of epoxidized soybean oil perfluorocarboxylate, 1-5 parts of a chain extender, 30-60 parts of an inorganic functional material and 0-40 parts of a polyol compound; the component B is isocyanate; the mass ratio of the component A to the component B is 100: (15-30). The fluorine element with strong electron withdrawing property is introduced, the epoxidized soybean oil and the perfluorocarboxylic acid are combined to prepare the epoxidized soybean oil perfluoro acid ester, and the fluorine-containing polyurethane packaging material prepared by taking the epoxidized soybean oil perfluoro acid