Thermoplastic elastomer composition as well as preparation method and application thereof

The invention relates to the technical field of high polymer materials, and discloses a thermoplastic elastomer composition as well as a preparation method and application thereof. The thermoplastic elastomer composition comprises 20 to 40 parts of ethylene propylene diene monomer, 10 to 20 parts of polypropylene, 20 to 40 parts of paraffin oil, 1 to 15 parts of a filling agent, 0.1 to 1 part of a lubricant, 0.5 to 2 parts of phenolic resin, 0.1 to 0.5 part of stannous chloride, 0.5 to 1 part of zinc oxide, 0.4 to 2 parts of an anti-aging agent, 0.1 to 0.5 part of an accelerant and 1 to 3 parts of a coloring agent. The preparation method comprises the following steps: adding the EPDM rubber and the polypropylene into a double-screw extruder in two times, dissolving the phenolic resin by using part of the paraffin oil, and finally extruding and granulating by using the double-screw extruder. The thermoplastic elastomer composition can be used for bonding the corners of the EPDM rubber sealing strip or sealing