The invention belongs to the field of foam materials, and discloses a thermoplastic elastomer microcellular foaming composition, a styrene-butadiene rubber/polylactic acid thermoplastic elastomer microcellular foam material as well as a preparation method and application thereof. The composition includes styrene-butadiene rubber, polylactic acid, vulcanizing agent, foaming agent, foaming auxiliary agent, antioxidant and anti-aging agent. Based on 100 parts by weight of styrene-butadiene rubber, the content of polylactic acid is 10-120 parts by weight, the vulcanizing agent is 0.5-30 parts by weight, the foaming agent is 1-50 parts by weight, the foaming auxiliary agent is 1-50 parts by weight, the antioxidant is 0.1-2 parts by weight, and the anti-aging agent is 0.5-10 parts by weight. The foaming composition adopts degradable polylactic acid as a functional component, which reduces the dependence of thermoplastic vulcanizates on petroleum resources. The prepared microcellular foam material possesses excellent mechanical properties and aging resistance.

Area Code: CN

Application Number: CN202110578195.8