Insulating material, and preparation method and use thereof

An insulating material, consisting of the following components in parts by mass:

• 100 parts of polyethylene;
• 0.01 parts to 1 part of a core-shell quantum dot;
• 0.5 parts to 2 parts of a peroxide cross-linking agent;
• and
• 0.5 parts to 2 parts of an antioxidant;
• wherein the core-shell quantum dot comprises a core layer, a shell layer covering a surface of the core layer, and an oil-soluble modified ligand on a surface of the shell layer;
• the core layer is selected from the group consisting of cadmium selenide and zinc selenide;
• and the shell layer is zinc sulfide;
• and
• the insulating material is prepared by a method comprising the following steps:
• dissolving the polyethylene in a first organic solvent to obtain a polyethylene solution;
• dispersing the core-shell quantum dot in a second organic solvent to obtain a core-shell quantum dot dispersion;
• mixing the polyethylene solution with the core-shell quantum dot dispersion, and subjecting a resulting mixture to distillation to obtain a core-shell quantum dot/polyethylene composite material;
• and
• mixing the core-shell quantum dot/polyethylene composite material, the peroxide cross-linking agent, and the antioxidant, and subjecting an obtained mixture to leveling absorption to obtain the insulating material.