Heat-shrinkable material, preparation method and application thereof, and double-wall heat-shrinkable sleeve

The invention is applicable to the technical field of materials, and provides a heat-shrinkable material, a preparation method and application thereof, and a double-wall heat-shrinkable sleeve, the heat-shrinkable material comprises an outer layer master batch and a hot melt adhesive modified master batch; the outer layer master batch is prepared from 60 to 90 parts of polyethylene, 10 to 40 parts of ethylene-methacrylate copolymer, 4 to 10 parts of polyethylene octylene copolymer elastomer, 0.5 to 3.0 parts of a sensitizer, 0.5 to 1.5 parts of an antioxidant and 0.5 to 2.0 parts of a lubricant; and the hot melt adhesive modified master batch is prepared from 70 to 90 parts of ethylene-vinyl acetate copolymer hot melt adhesive, 10 to 30 parts of polyamide hot melt adhesive, 0.5 to 1.5 parts of an anti-copper agent, 0.2 to 1.0 part of a free radical absorbent and 0.5 to 1.5 parts of an antioxidant. The prepared double-wall heat-shrinkable sleeve has the characteristics of rapid shrinkage at high temperature, n