Method for widening use temperature window of polyolefin thermoplastic elastomer

The invention discloses a method for widening a use temperature window of a polyolefin thermoplastic elastomer. The material is prepared from the following raw materials: 100 parts of OBC, 0.01-5 parts of an initiator, 0.1-20 parts of a boron-containing cross-linking agent, 0.05-0.2 part of an antioxidant and 1-20 parts of a plasticizer. The preparation method comprises the following steps: firstly, reacting boric acid molecules with polyhydric alcohols to prepare a boron-containing cross-linking agent; then carrying out reactive mixing on the OBC, the initiator, the boron-containing cross-linking agent, the antioxidant and the plasticizer by adopting conventional processing equipment, and then carrying out hot press molding by adopting a press vulcanizer. The method for preparing vitrimer is creatively adopted to widen the use temperature window of the polyolefin thermoplastic elastomer, the method has the advantages of being easy to operate, remarkably improving the use temperature and being capable of bein