▎ 摘　　要

NOVELTY - Preparing polyurethane, comprises (1) preparing polyether and polytetrahydrofuran ether as main body, adding polyethylene glycol (PEG) and polypropylene glycol (PPG) and blending with polyether and polytetrahydrofuran ether, and then adding compatibilizer polybranched polyester to modify polyether and polytetrahydrofuran ether, (2) adding soybean oil and 1,2,4-triazine-2-methyl-6-hydroxy-3-thio-5-one sequentially to the mixture obtained in step (1), and then adding foaming agent to obtain polyol, (3) preparing isocyanate using diphenylmethane diisocyanate, and (4) adding polyol prepared in step (2) into mixing reaction kettle, then adding isocyanate prepared in step (3), and mixing to obtain modified polyurethane. USE - The method is useful for preparing polyurethane. ADVANTAGE - The method has mild reaction conditions, and easily controllable reaction process.