聚氨酯和聚脲乳液是以二月桂酸二丁基锡作催化剂,由2,4或2,6-甲苯二异氰酸酯、聚丙二醇、二羟甲基丙酸在75～80℃下反应3 h合成的.用联氨或乙二胺作扩链剂生成聚脲,用乙二醇生成聚氨酯.以联氨或乙二胺扩链时,预聚物的分散在扩链反应前进行;以乙二醇扩链时则相反.丙酮在分散过程中的效果不明显.测定了不同软段和-NCO/-OH比值下,膜的力学性能、在木材表面的涂层特性以及附着力.
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