Stress-resistant, creep-resistant, high-temperature resistant and high-insulation sheath material for maglev train cable, and manufacturing method and use thereof

A stress-resistant, creep-resistant, high-temperature resistant and high-insulation sheath material for a maglev train cable, comprising the following raw materials in parts by weight:

• 100-150 parts of ultra-high molecular weight polyethylene (UHMWPE);
• 50-80 parts of functional polyvinylsilicone grease;
• 50-80 parts of ceramicized silicone rubber;
• 120-200 parts of phosphorus nitrogen flame retardant;
• 30-50 parts of reinforcing fillers;
• 5-10 parts of vulcanizing agent;
• 1-5 parts of vulcanization accelerator;
• 1-5 parts of coupling agent;
• 5-10 parts of compatibilizer;
• 2-5 parts of lubricant;
• 1-3 parts of antioxidant;
• and
• 1-2 parts of antistatic agent;
• wherein the functional polyvinylsilicone grease is a four-arm eight-membered ring star-shaped polymer represented by formula (I) and containing a large amount of unsaturated bonds,
• wherein z, x, m and n are numbers of repeated units, and are independently integrals between 300 and 500;
• the sheath material is prepared by performing melting blend on the UHMWPE, functional polyvinylsilicone grease, ceramicized silicone rubber, phosphorus nitrogen flame retardant, reinforcing filler, coupling agent, compatibilizer, lubricant, antioxidant and antistatic agent in ratios to obtain blended masterbatches and then performing melting blend on the blended masterbatches, vulcanizing agent and vulcanization accelerator to obtain pre-crosslinked masterbatches.