Modified polyurethane asphalt adhesive and methods for preparing and using same

A modified polyurethane asphalt adhesive and methods for preparing and using the same are provided in the prevent invention. Hydroxyl terminated polybutadiene, 2-ethyl-1, 3-hexanediol, naphthenic oil, barium sulphate, asphalt, a rheological agent, a molecular sieve, a drier, white carbon black, carbon black, and diphenylmethane diisocyanate are mixed according to a ratio, and processed. When in use, the adhesive is mixed and applied according to a specific ratio. The product has a super acid resistance ability, and can be used in high temperature acidic water environment for a long time with no obvious changes in performance. The modified polyurethane asphalt adhesive is particularly applicable to an ash receiving platform, a contraction joint, a portion with stagnant acidic water at the bottom of a flue of a wet desulfurization chimney. During field operation, two components can be applied to construction after being mixed evenly according to a ratio. The modified polyurethane asphalt adhesive is cured at room temperature with no additional conditions.