Method for preparing foamed styrene-butadiene rubber by adopting prepolymer method

The invention discloses a method for preparing foamed styrene-butadiene rubber by adopting a prepolymer method. The foamed styrene-butadiene rubber is prepared from the following raw materials in parts by weight: 50-100 parts of 1, 3-butadiene, 15-25 parts of styrene, 3-7 parts of an emulsifier, 0.3-0.6 parts of an initiator, 0.1-0.2 parts of a regulator, 1-3 parts of a cold-resistant agent, 1-3 parts of an antioxidant, 4-6 parts of a sodium chloride solution and 4-6 parts of a dilute sulfuric acid solution. The foamed styrene-butadiene rubber contains a cold-resistant agent and an antioxidant, molecules of the cold-resistant agent contain rigid group side chains and halogen atoms; the rigidity of the cold-resistant agent is increased by the rigid group; the halogen atoms improve the hydrophobicity of the cold-resistant agent, the cooperation of the rigid groups and the hydrophobic groups improves the water resistance of the cold-resistant agent, and after molecules of the oxygen-resistant agent are illuminat