基于阳离子型萜烯基环氧树脂多元醇的双组分水性聚氨酯的交联反应与性能

Crosslinking Reaction and Properties of Two-component Waterborne Polyurethane from Cationic Polyols Based on Hydrogenated Terpinene-maleic Ester Type Epoxy Resin

利用阳离子型萜烯基环氧树脂多元醇与聚异氰酸酯（EC385）配合制备双组分水性聚氨酯。通过纳米粒径分析表明，水性阳离子型萜烯基环氧树脂多元醇对EC385具有良好的分散性能，两者混合后，当固含量为30％～32％时，体系具有较理想的施工黏度。FT—IR分析表明，两者交联反应速率较快，室温（25℃）下5h可完全反应。交联产物具有优异的柔韧性、附着力、抗冲击性能以及耐水、耐碱、耐污染、抗粘连性能：以一缩二乙二醇、1，4-丁二醇为扩链剂、提高-NCO与-OH物质的量之比可增强交联产物的硬度及耐醇性。

A two-component waterborne polyurethane （2-K WPU） was prepared by mixing the cationic polyol from hydrogenated terpinene-maleic ester type epoxy resin with polyisocyanate （EC385）. It was shown by nanopartiele-size analysis that EC385 could be well dispersed by the cationic polyol. Proper operating viscosity was obtained using 2-K WPU with solid content between 30 % and 32 %. It was indicated by FT-IR that erosslinking reaction of cationic polyol with EC385 could be completed in 5 h at room temperature （25 ℃）. The crosslinked product had excellent properties of flexibility, adhesion, impact strength, water- resistance, alkali resistance, stain resistance and blocking resistance by standard tests. Its pencil hardness and ethanol resistance could be increased by using diethylene glycol or 1,4-butanediol as chain-extender with increased molar ratio of isocyanato group （-NCO） to hydroxyl group（-OH）.