Rubber-plastic mixed composition, dynamically vulcanized thermoplastic elastomer and preparation method thereof

The invention provides rubber-plastic mixed composition, a dynamically vulcanized thermoplastic elastomer and a preparation method thereof. The dynamically vulcanized thermoplastic elastomer is prepared by dynamically vulcanizing ethylene-propylene-diene monomer rubber, poly-4-methylpentene-1 and a cross-linking system by adopting an internal mixing process. The thermoplastic elastomer is high in strength, excellent in high-temperature resistance, small in permanent deformation and good in elasticity; the high-temperature resistance of the thermoplastic elastomer prepared by adopting the method cannot be matched by that of a thermoplastic elastomer prepared by other methods.