A new type of comonomer EDA-di ( diacetone propionamido) was synthesized by the Michael addition reaction using diacetone acrylamide and ethanediamine as raw materials. The structure of the monomer was verified by 1H NMR and 13C MNR. Polyurethane dispersions (PUDs) were synthesized by the prepolymerization process using polyneopentanediol adipate (PNA) as soft segment, isophorone diisocyanate (IPDI) as hard segment, dimethylolpropionic acid (DMPA) as hydrophilic monomer, EDA-di (diacetone propionamido) as functional monomer. Research was done to know the influence of monomer on polyurethane dispersions. The result showed that particle size increased as the content of monomer increased while viscosity decreased. The mechanical property was improved through the room temperature self-crosslinking of adipic dihydrazide (ADH).%利用乙二胺与双丙酮丙烯酰胺间的Michael加成反应合成了含酮羰基的新型扩链剂N,N'-二双丙酮丙酰胺基乙二胺,用1H NMR和13C MNR证实了结构.聚己二酸新戊二醇酯、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)预聚后加入N,N'-二双丙酮丙酰胺基乙二胺扩链得到含酮聚氨酯预聚物,预聚物经分散、乙二胺扩链后得到聚氨酯分散体.研究了含酮扩链剂用量对分散体及其膜性能的影响.结果表明随N,N'-二双丙酮丙酰胺基乙二胺的增加,聚氨酯分散体的粒径增大、黏度减小.己二酸二酰肼交联后能明显提高WPU胶膜的力学性能.
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